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[Music]

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hello everyone and welcome back to the

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kia ora theater at linux conference

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australia 2022

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uh

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our next presentation is pre-recorded uh

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so

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uh

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i'm the only person talking to you right

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now but we will get pre-recorder paris

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in here soon

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um

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so dr paris buttfield addison is the

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co-founder of independent game

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development studio secret lab today he

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is here to help us learn about godot

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oh i didn't check how to pronounce godot

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we'll learn in the talk uh take a

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tour of its features and powerful

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scripting system and quickly build a

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game uh showcasing the godot editor for

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mac os windows and linux

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paris is available in chat throughout so

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feel free to ask questions as we go take

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it away with your pre-recorded paris

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hi everyone welcome to let's make a game

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my name is paris but for edison

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you can tweet me at paris ba i'd love to

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hear from you

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please feel free to do that and let me

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know what you think questions about godo

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anything else or just want to tell me

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you like my glasses which is a common

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comment

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i am a video game developer

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uh best known for working at secret lab

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which worked the night in the woods lots

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of o'reilly books lots of technical

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books uh and the younesman narrative

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game tool

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today i'm here to talk to you about a

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fantastic and completely free and open

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source game engine named gotto or godot

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depending on how you pronounce these

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things

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godot is a fully open source project

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that really genuinely competes with the

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big mainstream commercial video game

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engines like unreal and unity it is

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named after the play with pictured here

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starring patrick stewart and ian

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mckellen that was a fantastic player uh

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but starring many people over the years

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it is a powerful little gaming engine uh

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it is a project of the software freedom

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conservancy uh the software very

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conservatively shepherds a lot of

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projects and godot is one of them they

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make sure that the project is compliant

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with their open source licenses and

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other people are compliant with the

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license when they're using them

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but godo really is an astonishingly

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powerful game engine it is one of my

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favorite free and open source projects

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it has many of the same features as the

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big commercial projects uh and really

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competes with them but it's entirely

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free in open source it has good ui good

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ux uh it's

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quite easy to develop with it's powerful

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it can deploy to almost every platform

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you can think so uh today i'm going to

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take you through building a little game

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very simple game from scratch

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and talk about how and why you can use

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godo to do this sort of thing

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hopefully by the end you'll see why it's

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really powerful and how it's easy to use

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i'm not going to

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structure this tutorial this is more

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just going to be

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enthusing you about gotto so don't

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necessarily try and follow along i

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really hope you enjoy it's a really good

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fun relatively cheap hobby to build

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little video games share with your

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family and friends uh

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let's jump in and get started so

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we'll see how it goes

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here's gotto open on my uh my macos

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device

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godo runs on pretty much anything linux

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macos windows

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you can uh see it running in the dock

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there it's got this cute little robot

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icon

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so

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in godo

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godo is actually written in godo so the

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game engine itself that you're using to

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write your game is actually built using

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godo which is a pretty cool thing and

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they're pretty cool proof that it's

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actually a pretty solid thing

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i'm going to click the new project

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button to make a brand new project

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well hopefully that works

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and

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and we're going to call it paris and

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tim's game

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because we designed this uh this game

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together with tim nugent my colleague

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for using in talks and tutorials

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and i'm going to select opengl 3

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and create an edit and it's going to

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make a brand new project in gotto

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and i'm just going to maximize godot

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there

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so this is gotto got it looks like most

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3d tools in most game engines it has a a

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3d environment for you to navigate in

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and move around in it operates on three

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different axes x y and z

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and you can manipulate the scene using

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those axes in the corner there so we're

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not going to go into too much detail on

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how to navigate in 3d hopefully many of

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you have used blender or a similar 3d

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tool but if you're not it's not too hard

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my only recommendation would be if you

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were using a laptop maybe plug in a

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mouse if you're not super confident

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using the trackpad to do this kind of

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thing

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so this is our big formless void that we

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exist in here in godo

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and we're going to turn this formless

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void into a video game

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to turn this formless void into a video

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game uh

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it's empty at the moment we're going to

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add a node to this scene

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uh our root node for the scene is kind

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of going to dictate what kind of scene

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it is so everything in godot is made up

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of scenes with nodes in them

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here are the options for the various

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kinds of root nodes we can create

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we're going to make it spatial

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so a spatial node is a basic 3d parent

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in gono so everything that is kind of 3d

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descends from this spatial mode and

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gallo spatula doesn't really do anything

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beyond have a a transform

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a space a thing that makes it exist in

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the space in a certain position

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so here is our spatial node it's

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currently just called spatial it's very

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unexciting

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we can add additional nodes below this

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spatial node as we desire and we'll be

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doing a lot of that today

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so

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this is our spatial node here in the in

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the node list in the node viewer

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we're going to add another node

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while our spatial node is selected

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it's going to be a mesh

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instance node

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a mesh instance node references a mesh

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and lets us have something visible in

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the scene so it meshes any kind of 3d

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object it could be a primitive 3d object

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like a cube or it could be something

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you've rendered in blender

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so node is the parent of all things in

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godo and then we're using spatial node

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which is below it and then there's this

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hierarchy of nodes which dictate how

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things work so a mesh instance is

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a child of spatial and spatial is a

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child of node

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so we've now got a smash instance as a

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child of our spatial mode

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we're going to make a cube so over here

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in the inspector while our mesh instance

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is selected over on the right side of

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the screen

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we're going to add an actual mesh so

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we're going to click the empty mesh area

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i'm going to go new cube mesh

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uh if we wanted to we could import an

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actual mesh from like blender or one of

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the commercial modeling packages here if

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we wanted to but uh goto like most game

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engines ships with a bunch of primitive

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uh you can use

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so now is our lovely cube as you can see

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that video game is basically done

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we're going to go to the materials

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section and go

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new

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spatial material

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and we're going to set it to a color

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because we want our video game to be

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nice and colorful

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so uh hmm what color should we make it

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maybe yeah orangey

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yeah this is a good color so this mesh

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cube is going to be our floor for our

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video game so our floor is going to be a

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nice

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egregious orangey brown

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kind of color that looks pretty good

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so we've got our nice orange cube

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so

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with our cube made we're going to select

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the mesh instance over in our inspector

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again

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and we're going to click the little mesh

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button in the top of the screen

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this button

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allows us to create a static body for

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the mesh

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so this body will allow the mesh to

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collide with things in the world

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currently it's just a picture of a cube

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and by clicking this button we give it a

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static body which allows it to collide

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with things in the physics engine that

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godo ships with

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so

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video games uh

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often have really high resolution

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complex meshes

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uh so

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you need to create a

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fancy collision body to map to it

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because you can't use the mesh itself as

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the collision body for performance

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reasons in older video games you'd often

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use the mesh itself as the collider

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these days you kind of want to make a

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simplified mesh that goes around it to

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serve as the collision body you

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technically don't have to do that

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because we're doing it with cubes we

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could get away with just using the cube

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as the collision body

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but good practice in video game

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development is to create a collision

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shape that is a simplified version of

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the thing you're actually using in this

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case the simplified version will just be

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another copy of a cube but uh using that

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create mesh button means you're doing it

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properly

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so a static body in godot is a thing

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that exists in the phoenix engine but

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doesn't move or is at least strongly

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discouraged from moving so there's a

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different type of body with a collider

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you would make if you wanted it to move

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and you'll see that a bit later

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so i'm going to select the mesh and push

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the r button which switches to scaling

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mode and you can see the different tools

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we can use here so i push the r button

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on the keyboard and i'm going to squish

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the cube a little bit to make a floor

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this is just changing the transform of

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the cube

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it doesn't mean i have to do anything

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precisely uh i could just make a floor

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basically so i could also use the

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transform inspector to fiddle with it

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here so i'm going to make it bigger 10

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and i'm going to make it half high and

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i'm going to make it 10 again

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so now we've got a nice big flat floor

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it's our orange

283
00:09:24,640 --> 00:09:29,200
so most video game engines have kind of

284
00:09:26,880 --> 00:09:31,120
settled on this approach where you have

285
00:09:29,200 --> 00:09:34,720
objects with parameters attached to them

286
00:09:31,120 --> 00:09:36,880
uh commercial alike unity unreal goto

287
00:09:34,720 --> 00:09:39,279
game maker all of them have this kind of

288
00:09:36,880 --> 00:09:40,399
component based architecture

289
00:09:39,279 --> 00:09:41,360
that they use

290
00:09:40,399 --> 00:09:43,680
to

291
00:09:41,360 --> 00:09:46,080
give things behaviors and parameters so

292
00:09:43,680 --> 00:09:47,680
you attach things to things and some of

293
00:09:46,080 --> 00:09:50,000
those things have parameters in godo's

294
00:09:47,680 --> 00:09:51,440
case you have nodes and you have

295
00:09:50,000 --> 00:09:53,200
components attached to those which give

296
00:09:51,440 --> 00:09:54,080
you properties

297
00:09:53,200 --> 00:09:55,600
uh

298
00:09:54,080 --> 00:09:56,720
yeah it's very common this is not just a

299
00:09:55,600 --> 00:09:58,080
gun i think this is a generic game

300
00:09:56,720 --> 00:09:59,839
development thing

301
00:09:58,080 --> 00:10:00,959
i've just renamed the spatial mode to

302
00:09:59,839 --> 00:10:02,399
floor

303
00:10:00,959 --> 00:10:04,079
so i've right clicked on it and gone

304
00:10:02,399 --> 00:10:05,279
rename and call it floor because it's a

305
00:10:04,079 --> 00:10:08,079
floor

306
00:10:05,279 --> 00:10:09,680
so our scene is currently unsaved

307
00:10:08,079 --> 00:10:10,800
we need to save it so to save it i'm

308
00:10:09,680 --> 00:10:13,040
going to push command s on mac or

309
00:10:10,800 --> 00:10:14,880
control this on linux or windows

310
00:10:13,040 --> 00:10:16,399
floor.tscn is good i'm going to just

311
00:10:14,880 --> 00:10:18,560
save it so now we've got a floor scene

312
00:10:16,399 --> 00:10:20,160
it's saved you'll see down here in the

313
00:10:18,560 --> 00:10:22,240
file system inspector we have a copy of

314
00:10:20,160 --> 00:10:24,160
that floor scene available to us now

315
00:10:22,240 --> 00:10:25,360
that's everything for the floor

316
00:10:24,160 --> 00:10:26,800
so

317
00:10:25,360 --> 00:10:28,399
godo

318
00:10:26,800 --> 00:10:30,240
actually

319
00:10:28,399 --> 00:10:31,680
does something quite interesting and

320
00:10:30,240 --> 00:10:34,160
many other game engines now inspired by

321
00:10:31,680 --> 00:10:35,760
godown are doing as well uh goto builds

322
00:10:34,160 --> 00:10:37,600
everything up out of scenes

323
00:10:35,760 --> 00:10:39,360
so you can actually nest scenes within

324
00:10:37,600 --> 00:10:40,560
each other and we'll see how that works

325
00:10:39,360 --> 00:10:42,160
later on

326
00:10:40,560 --> 00:10:43,440
uh you might have like a player scene

327
00:10:42,160 --> 00:10:45,040
you might have multiple players scene

328
00:10:43,440 --> 00:10:46,880
you could load multiple instances of one

329
00:10:45,040 --> 00:10:49,519
scene to another scene so you kind of

330
00:10:46,880 --> 00:10:50,800
use scenes as this basic object format

331
00:10:49,519 --> 00:10:53,040
which you can then load into other

332
00:10:50,800 --> 00:10:54,720
scenes so you can replicate things and

333
00:10:53,040 --> 00:10:55,760
then only update the original

334
00:10:54,720 --> 00:10:57,120
for

335
00:10:55,760 --> 00:10:59,680
creating it

336
00:10:57,120 --> 00:11:01,680
it's very useful uh godo and unity

337
00:10:59,680 --> 00:11:02,959
really lean on this heavily so speaking

338
00:11:01,680 --> 00:11:04,720
of scenes i'm going to make a new scene

339
00:11:02,959 --> 00:11:05,839
right now with the scene menu and now

340
00:11:04,720 --> 00:11:08,240
we'll end up with an empty scene you'll

341
00:11:05,839 --> 00:11:09,360
see the flaw still is up there

342
00:11:08,240 --> 00:11:10,720
i'm going to do pretty much exactly the

343
00:11:09,360 --> 00:11:12,160
same thing as i did last time and add a

344
00:11:10,720 --> 00:11:13,920
new spatial node

345
00:11:12,160 --> 00:11:15,600
inside that spatial node i will add a

346
00:11:13,920 --> 00:11:17,279
mesh instance

347
00:11:15,600 --> 00:11:19,120
exactly the same as i did last time

348
00:11:17,279 --> 00:11:21,920
inside the mesh instance i will create a

349
00:11:19,120 --> 00:11:24,240
new mesh again another cube

350
00:11:21,920 --> 00:11:26,560
and i will create another material and

351
00:11:24,240 --> 00:11:27,600
set a different color on this mesh and

352
00:11:26,560 --> 00:11:28,720
we'll have to have a think about which

353
00:11:27,600 --> 00:11:30,399
column

354
00:11:28,720 --> 00:11:32,959
maybe yellowy

355
00:11:30,399 --> 00:11:36,240
yellow's good a bit too green there yeah

356
00:11:32,959 --> 00:11:36,240
yellow yellowy

357
00:11:36,720 --> 00:11:39,760
yellow is good that's disgusting yellow

358
00:11:38,640 --> 00:11:41,360
love it

359
00:11:39,760 --> 00:11:42,640
perfect

360
00:11:41,360 --> 00:11:44,399
i'm going to create another tri-mesh

361
00:11:42,640 --> 00:11:45,839
static body for our mesh because it's

362
00:11:44,399 --> 00:11:47,360
also going to be static and i'm also

363
00:11:45,839 --> 00:11:49,360
going to scale it a little bit by

364
00:11:47,360 --> 00:11:50,760
modifying the transform i'm going to

365
00:11:49,360 --> 00:11:52,560
make it uh

366
00:11:50,760 --> 00:11:55,680
0.25

367
00:11:52,560 --> 00:11:58,639
1 and 10. so this is going to be a nice

368
00:11:55,680 --> 00:11:58,639
wall for us to use

369
00:11:59,120 --> 00:12:03,279
so

370
00:11:59,920 --> 00:12:06,079
you'll see we've made a little wall here

371
00:12:03,279 --> 00:12:07,600
i'm going to rename the spatial node to

372
00:12:06,079 --> 00:12:08,560
wall

373
00:12:07,600 --> 00:12:10,160
walls

374
00:12:08,560 --> 00:12:12,399
and i'm going to save that scene so it's

375
00:12:10,160 --> 00:12:15,920
going to be called walls.tscn

376
00:12:12,399 --> 00:12:17,839
now we've got two scenes open

377
00:12:15,920 --> 00:12:19,600
we've made two fantastic scenes a floor

378
00:12:17,839 --> 00:12:21,440
and a walls both egregious disgusting

379
00:12:19,600 --> 00:12:22,480
colors i'm going to make yet another

380
00:12:21,440 --> 00:12:23,600
scene now

381
00:12:22,480 --> 00:12:25,040
and

382
00:12:23,600 --> 00:12:27,200
i'm going to add a spatial node to that

383
00:12:25,040 --> 00:12:29,519
scene

384
00:12:27,200 --> 00:12:31,120
yep spatial node done

385
00:12:29,519 --> 00:12:33,200
i'm going to rename the spatial node to

386
00:12:31,120 --> 00:12:34,880
environment

387
00:12:33,200 --> 00:12:35,760
this uh this scene is going to hold our

388
00:12:34,880 --> 00:12:37,600
level

389
00:12:35,760 --> 00:12:39,360
this is going to hold our world that the

390
00:12:37,600 --> 00:12:42,000
player has adventures in

391
00:12:39,360 --> 00:12:44,560
so i'm going to select the spatial node

392
00:12:42,000 --> 00:12:46,079
and click the link node so the add node

393
00:12:44,560 --> 00:12:48,079
lets you add new fresh nodes to the

394
00:12:46,079 --> 00:12:50,000
scene and the link node lets you bring

395
00:12:48,079 --> 00:12:51,279
in existing scenes so i'm going to click

396
00:12:50,000 --> 00:12:52,800
that link button

397
00:12:51,279 --> 00:12:54,240
and you'll see my two scenes already

398
00:12:52,800 --> 00:12:55,680
saved before

399
00:12:54,240 --> 00:12:57,519
i'm going to click the floor

400
00:12:55,680 --> 00:12:59,040
so now we've linked the floor scene into

401
00:12:57,519 --> 00:13:00,480
our new scene

402
00:12:59,040 --> 00:13:01,839
so anything we modify in the original

403
00:13:00,480 --> 00:13:04,079
floor scene will take effect in this

404
00:13:01,839 --> 00:13:05,680
scene because they're linked

405
00:13:04,079 --> 00:13:07,040
i'm going to now

406
00:13:05,680 --> 00:13:08,959
do the same thing again so i'm going to

407
00:13:07,040 --> 00:13:11,120
select the environment node so it's

408
00:13:08,959 --> 00:13:14,880
going to be a child of the environment

409
00:13:11,120 --> 00:13:16,399
and then i'm going to select walls

410
00:13:14,880 --> 00:13:17,920
so now you'll see my walls are on top of

411
00:13:16,399 --> 00:13:19,279
my floor well actually embedded in it

412
00:13:17,920 --> 00:13:21,200
right now

413
00:13:19,279 --> 00:13:23,440
i'm going to use the move tool w on the

414
00:13:21,200 --> 00:13:25,680
keyboard and i'm going to move the walls

415
00:13:23,440 --> 00:13:26,800
to be you know actual walls i'm going to

416
00:13:25,680 --> 00:13:28,639
move them

417
00:13:26,800 --> 00:13:30,800
over here it's not snapping very nicely

418
00:13:28,639 --> 00:13:32,560
so i'm going to actually turn on snap by

419
00:13:30,800 --> 00:13:34,560
selecting the snap button or pushing y

420
00:13:32,560 --> 00:13:35,839
on my keyboard which will make it snap

421
00:13:34,560 --> 00:13:38,399
you can configure the snap and how it

422
00:13:35,839 --> 00:13:39,680
works so what parameters it snaps to

423
00:13:38,399 --> 00:13:43,040
i'm going to switch the view to the top

424
00:13:39,680 --> 00:13:44,480
so i can see it nicely to align my walls

425
00:13:43,040 --> 00:13:46,320
now i can use snap to place the wall in

426
00:13:44,480 --> 00:13:47,760
the right position

427
00:13:46,320 --> 00:13:49,440
i'm going to select the walls and push

428
00:13:47,760 --> 00:13:52,160
command d on my mac or control d on

429
00:13:49,440 --> 00:13:54,160
linux or windows and duplicate my walls

430
00:13:52,160 --> 00:13:56,000
again these are all linked copies of the

431
00:13:54,160 --> 00:13:58,720
original wall scene so if i went to wall

432
00:13:56,000 --> 00:14:00,399
scene and made it less egregious yellow

433
00:13:58,720 --> 00:14:01,279
it would change all the copies of the

434
00:14:00,399 --> 00:14:03,680
wall

435
00:14:01,279 --> 00:14:05,440
i'm going to duplicate the wall again

436
00:14:03,680 --> 00:14:07,440
so we've got three walls now this is

437
00:14:05,440 --> 00:14:09,360
pretty common in most games you are

438
00:14:07,440 --> 00:14:11,920
duplicate things move around in 3d space

439
00:14:09,360 --> 00:14:14,000
duplicate things so on and so on so i

440
00:14:11,920 --> 00:14:15,279
need to rotate it so with the wall i

441
00:14:14,000 --> 00:14:17,199
need to rotate selected i'm going to go

442
00:14:15,279 --> 00:14:20,160
to the transform inspector and going to

443
00:14:17,199 --> 00:14:21,680
rotate it 90 degrees on the y axis

444
00:14:20,160 --> 00:14:24,079
so it's flipped around exactly how we

445
00:14:21,680 --> 00:14:25,680
need it then i'm going to move it

446
00:14:24,079 --> 00:14:27,120
and duplicate it again

447
00:14:25,680 --> 00:14:30,800
and put it down at the bottom so now we

448
00:14:27,120 --> 00:14:31,760
have four walls on our scene

449
00:14:30,800 --> 00:14:33,519
i could fiddle with the snapping a

450
00:14:31,760 --> 00:14:35,440
little bit to make it more precise

451
00:14:33,519 --> 00:14:37,279
but uh this is how you do that i haven't

452
00:14:35,440 --> 00:14:38,880
got the energy to do that right now

453
00:14:37,279 --> 00:14:40,320
you know so i can make it

454
00:14:38,880 --> 00:14:41,519
0.5 on i guess i'm not as lazy as i

455
00:14:40,320 --> 00:14:43,120
thought it was

456
00:14:41,519 --> 00:14:45,600
so now i can snap a little bit better

457
00:14:43,120 --> 00:14:46,720
nice nice and precise

458
00:14:45,600 --> 00:14:47,519
it looks good how it was i'm gonna leave

459
00:14:46,720 --> 00:14:48,560
it

460
00:14:47,519 --> 00:14:50,639
now i'm gonna save this as

461
00:14:48,560 --> 00:14:52,320
environment.tcn so command s or control

462
00:14:50,639 --> 00:14:53,600
s and saving

463
00:14:52,320 --> 00:14:56,399
now i've saved the scene we've got this

464
00:14:53,600 --> 00:14:58,639
beautiful scene up and running

465
00:14:56,399 --> 00:14:59,760
look at that it's beautiful our game is

466
00:14:58,639 --> 00:15:01,199
almost done

467
00:14:59,760 --> 00:15:02,880
so obviously i need to move the walls up

468
00:15:01,199 --> 00:15:03,839
a little bit so i'll just slide them up

469
00:15:02,880 --> 00:15:05,519
a little bit

470
00:15:03,839 --> 00:15:07,680
they're not quite in the right position

471
00:15:05,519 --> 00:15:09,920
i want them to be in so i'll move them

472
00:15:07,680 --> 00:15:11,279
all up while the snap tool is still on

473
00:15:09,920 --> 00:15:13,600
this one

474
00:15:11,279 --> 00:15:15,120
and this one

475
00:15:13,600 --> 00:15:16,560
that looks great

476
00:15:15,120 --> 00:15:18,560
now they're much more wallish than they

477
00:15:16,560 --> 00:15:22,160
used to be beautiful

478
00:15:18,560 --> 00:15:23,760
so also hit command s to save it

479
00:15:22,160 --> 00:15:27,199
beautiful floor it's great we're nearly

480
00:15:23,760 --> 00:15:28,480
done we're not actually done no okay so

481
00:15:27,199 --> 00:15:29,759
now i'm going to rename the floor to

482
00:15:28,480 --> 00:15:30,560
lower floor

483
00:15:29,759 --> 00:15:31,920
because we're going to have an upper

484
00:15:30,560 --> 00:15:33,680
floor in a minute as well and we don't

485
00:15:31,920 --> 00:15:35,120
want to get confused i can't put spaces

486
00:15:33,680 --> 00:15:37,440
in and i am just used to not having

487
00:15:35,120 --> 00:15:38,639
spaces in files

488
00:15:37,440 --> 00:15:41,639
i'm going to link another instance of

489
00:15:38,639 --> 00:15:41,639
floor

490
00:15:42,399 --> 00:15:45,759
well oops no i'm going to link another

491
00:15:43,600 --> 00:15:47,279
instance of the floor scene sorry

492
00:15:45,759 --> 00:15:49,279
there we go i don't want to nest myself

493
00:15:47,279 --> 00:15:50,399
in myself there so now i have two floors

494
00:15:49,279 --> 00:15:51,759
they're exactly in the same place right

495
00:15:50,399 --> 00:15:53,920
now so i'm going to move one of them up

496
00:15:51,759 --> 00:15:55,519
a little bit and put it over here so we

497
00:15:53,920 --> 00:15:57,680
have an upper floor and a lower floor

498
00:15:55,519 --> 00:15:58,880
isn't that fantastic look at them

499
00:15:57,680 --> 00:16:00,880
i'm going to rename it so it's upper

500
00:15:58,880 --> 00:16:02,399
floor and i don't confuse myself

501
00:16:00,880 --> 00:16:04,399
again you can have spaces i'm just old

502
00:16:02,399 --> 00:16:07,199
school

503
00:16:04,399 --> 00:16:09,279
so with our two floors in place

504
00:16:07,199 --> 00:16:10,560
uh we can

505
00:16:09,279 --> 00:16:11,920
move on

506
00:16:10,560 --> 00:16:13,360
so

507
00:16:11,920 --> 00:16:14,480
two floors what else do you think we

508
00:16:13,360 --> 00:16:17,839
need well

509
00:16:14,480 --> 00:16:19,440
we might need a uh

510
00:16:17,839 --> 00:16:21,680
an additional

511
00:16:19,440 --> 00:16:22,880
way to get between the two floors i'm

512
00:16:21,680 --> 00:16:24,160
not going to put any walls on the upper

513
00:16:22,880 --> 00:16:25,360
floor i'm actually going to make a brand

514
00:16:24,160 --> 00:16:26,399
new scene again

515
00:16:25,360 --> 00:16:27,920
and

516
00:16:26,399 --> 00:16:31,519
repeat the process that we've done so

517
00:16:27,920 --> 00:16:33,199
far add a spatial node uh you know add a

518
00:16:31,519 --> 00:16:34,320
mesh instance

519
00:16:33,199 --> 00:16:35,360
uh first i'm going to run this ramp

520
00:16:34,320 --> 00:16:39,279
actually

521
00:16:35,360 --> 00:16:41,120
now i'm going to add the mesh instance

522
00:16:39,279 --> 00:16:42,320
and with my mesh instance i'm going to

523
00:16:41,120 --> 00:16:44,079
create a

524
00:16:42,320 --> 00:16:47,199
oops i didn't create a mesh i'm going to

525
00:16:44,079 --> 00:16:49,600
create a mesh on this new mesh instance

526
00:16:47,199 --> 00:16:50,399
so we actually have something

527
00:16:49,600 --> 00:16:51,920
visible

528
00:16:50,399 --> 00:16:53,279
so on our mesh instance i'm going to

529
00:16:51,920 --> 00:16:54,720
select the mesh instance and then like a

530
00:16:53,279 --> 00:16:55,839
second ago i'm going to create a new

531
00:16:54,720 --> 00:16:58,959
cube mesh

532
00:16:55,839 --> 00:17:01,440
and pick a new egregious color so maybe

533
00:16:58,959 --> 00:17:03,120
like another green yellow egregious

534
00:17:01,440 --> 00:17:05,520
i don't know maybe

535
00:17:03,120 --> 00:17:06,640
ooh green yeah maybe nice and green that

536
00:17:05,520 --> 00:17:07,679
looks good

537
00:17:06,640 --> 00:17:10,240
okay

538
00:17:07,679 --> 00:17:12,640
the green really screams ramp to me

539
00:17:10,240 --> 00:17:15,039
so big ramp energy so i'm going to

540
00:17:12,640 --> 00:17:17,439
create my static clutter again

541
00:17:15,039 --> 00:17:19,439
and modify the transform of this mesh to

542
00:17:17,439 --> 00:17:23,039
make it more ramp like

543
00:17:19,439 --> 00:17:25,000
so maybe uh 1.44

544
00:17:23,039 --> 00:17:27,760
0.1 and

545
00:17:25,000 --> 00:17:28,880
5.47 yeah i think that's good that looks

546
00:17:27,760 --> 00:17:32,000
like around to me i totally did not

547
00:17:28,880 --> 00:17:33,039
prepare those numbers in advance

548
00:17:32,000 --> 00:17:35,440
that's beautiful i'm going to save that

549
00:17:33,039 --> 00:17:37,039
scene as ramp.tscn

550
00:17:35,440 --> 00:17:38,240
done beautiful

551
00:17:37,039 --> 00:17:40,320
back in our environment so i'll switch

552
00:17:38,240 --> 00:17:42,640
the tab at the top there

553
00:17:40,320 --> 00:17:44,799
i'm going to uh link in the ramp

554
00:17:42,640 --> 00:17:47,520
so add the node via the link

555
00:17:44,799 --> 00:17:48,240
button has a child of environment

556
00:17:47,520 --> 00:17:50,080
so

557
00:17:48,240 --> 00:17:53,280
we're going to select that link button

558
00:17:50,080 --> 00:17:54,559
and we're going to choose ramp.tscn

559
00:17:53,280 --> 00:17:56,000
and with the ramp in the scene you'll

560
00:17:54,559 --> 00:17:57,600
see it's embedded in the floor currently

561
00:17:56,000 --> 00:17:58,640
so we're going to move it up a little

562
00:17:57,600 --> 00:18:01,120
bit

563
00:17:58,640 --> 00:18:01,919
there it is it is our facing the wrong

564
00:18:01,120 --> 00:18:03,760
way

565
00:18:01,919 --> 00:18:05,760
but we'll fix it

566
00:18:03,760 --> 00:18:07,120
in a moment

567
00:18:05,760 --> 00:18:08,640
we control the universe so it doesn't

568
00:18:07,120 --> 00:18:10,080
really matter where anything goes so

569
00:18:08,640 --> 00:18:12,640
we'll hit the rotation button and then

570
00:18:10,080 --> 00:18:14,720
we'll use the rotation button to rotate

571
00:18:12,640 --> 00:18:16,240
it a little bit look at that that's

572
00:18:14,720 --> 00:18:18,480
beautiful

573
00:18:16,240 --> 00:18:20,559
rotated and then we'll move it across a

574
00:18:18,480 --> 00:18:22,000
little bit using the move button

575
00:18:20,559 --> 00:18:23,600
and rotate a little bit more so it

576
00:18:22,000 --> 00:18:25,039
actually is a ramp

577
00:18:23,600 --> 00:18:26,880
and we've got a ramp happening there

578
00:18:25,039 --> 00:18:28,960
that's great

579
00:18:26,880 --> 00:18:32,160
that's close enough that's kind of good

580
00:18:28,960 --> 00:18:34,799
i think yeah it looks nice to me

581
00:18:32,160 --> 00:18:36,400
i'm going to save that just so it's uh

582
00:18:34,799 --> 00:18:37,600
preserved

583
00:18:36,400 --> 00:18:38,640
we might clean that up a bit in the

584
00:18:37,600 --> 00:18:40,080
future

585
00:18:38,640 --> 00:18:41,200
but right now

586
00:18:40,080 --> 00:18:44,000
our game is almost there but we're

587
00:18:41,200 --> 00:18:46,240
missing one crucial thing a player

588
00:18:44,000 --> 00:18:49,280
so i'm going to make a new scene

589
00:18:46,240 --> 00:18:50,720
the scene is going to be our player

590
00:18:49,280 --> 00:18:51,919
we could have put all of this in one

591
00:18:50,720 --> 00:18:53,200
scene and made all these things out of

592
00:18:51,919 --> 00:18:55,280
nodes but then it wouldn't be following

593
00:18:53,200 --> 00:18:56,799
a nice reusable game architecture

594
00:18:55,280 --> 00:18:58,320
because when you're building video games

595
00:18:56,799 --> 00:19:00,000
it makes sense to make things out of

596
00:18:58,320 --> 00:19:02,080
composable pieces so you can reuse them

597
00:19:00,000 --> 00:19:03,440
as you need in a multiplayer game you

598
00:19:02,080 --> 00:19:04,960
might have a player scene that is

599
00:19:03,440 --> 00:19:06,720
instantiated multiple times and

600
00:19:04,960 --> 00:19:08,240
connected to different inputs some over

601
00:19:06,720 --> 00:19:09,840
the network for example

602
00:19:08,240 --> 00:19:11,600
and by doing it like this even when

603
00:19:09,840 --> 00:19:13,760
you're making a silly little sample game

604
00:19:11,600 --> 00:19:16,160
uh it helps you keep things

605
00:19:13,760 --> 00:19:17,760
reusable so we're going to create a

606
00:19:16,160 --> 00:19:19,760
kinematic body

607
00:19:17,760 --> 00:19:21,600
kinematic is a fancy word for it moves

608
00:19:19,760 --> 00:19:24,400
so unlike our static body the kinematic

609
00:19:21,600 --> 00:19:26,960
body can actually move around

610
00:19:24,400 --> 00:19:29,120
so we need a mesh as well

611
00:19:26,960 --> 00:19:30,400
so below our kinematic body

612
00:19:29,120 --> 00:19:31,360
we're going to have a mesh it's not

613
00:19:30,400 --> 00:19:32,400
going to be a cube this time we're going

614
00:19:31,360 --> 00:19:34,799
to make a capsule because the

615
00:19:32,400 --> 00:19:37,360
traditional prototyping

616
00:19:34,799 --> 00:19:38,880
mesh for video game is a capsule

617
00:19:37,360 --> 00:19:40,480
prototyping is always a capsule i'm

618
00:19:38,880 --> 00:19:41,600
gonna pick a nice egregious color for

619
00:19:40,480 --> 00:19:44,640
our player

620
00:19:41,600 --> 00:19:46,000
maybe bluey blue yeah i think blue today

621
00:19:44,640 --> 00:19:48,640
for our player

622
00:19:46,000 --> 00:19:50,840
that that says player to me

623
00:19:48,640 --> 00:19:54,080
nice blue player

624
00:19:50,840 --> 00:19:56,240
cube we're not going to rotate it up uh

625
00:19:54,080 --> 00:19:58,000
we'll rotate it up later

626
00:19:56,240 --> 00:20:00,080
so we're going to click on mesh

627
00:19:58,000 --> 00:20:02,960
uh click our kinematic body and click

628
00:20:00,080 --> 00:20:04,559
collision shape

629
00:20:02,960 --> 00:20:08,159
this allows us to

630
00:20:04,559 --> 00:20:09,679
represent this in the physics engine

631
00:20:08,159 --> 00:20:12,000
but this means it can move as well it's

632
00:20:09,679 --> 00:20:14,640
not a static thing

633
00:20:12,000 --> 00:20:17,520
our collision shape

634
00:20:14,640 --> 00:20:19,919
must have a shape attached to it so with

635
00:20:17,520 --> 00:20:22,480
our collision shape selected we need to

636
00:20:19,919 --> 00:20:25,919
go over to the inspector on the right

637
00:20:22,480 --> 00:20:28,000
and allocate a shape to it

638
00:20:25,919 --> 00:20:29,360
so

639
00:20:28,000 --> 00:20:30,880
our collision has a little error on it

640
00:20:29,360 --> 00:20:33,039
that's because it doesn't have a shape

641
00:20:30,880 --> 00:20:34,720
assigned to it so

642
00:20:33,039 --> 00:20:35,679
in the inspector we're going to go

643
00:20:34,720 --> 00:20:37,280
across

644
00:20:35,679 --> 00:20:38,880
and give it a shape

645
00:20:37,280 --> 00:20:40,240
and surprising nobody it's going to be a

646
00:20:38,880 --> 00:20:41,840
capsule

647
00:20:40,240 --> 00:20:43,039
so this is the uh the thing that's

648
00:20:41,840 --> 00:20:45,280
actually represented in the physics

649
00:20:43,039 --> 00:20:46,799
engine for this shape and coincidentally

650
00:20:45,280 --> 00:20:48,720
it's also a capsule because the capsule

651
00:20:46,799 --> 00:20:50,159
just needs a capsule collider

652
00:20:48,720 --> 00:20:51,840
but unlike the other static stuff we

653
00:20:50,159 --> 00:20:53,600
created because this is kinematic with a

654
00:20:51,840 --> 00:20:56,880
collision shape it can move because it's

655
00:20:53,600 --> 00:20:56,880
helpful when your player can move

656
00:20:58,080 --> 00:21:04,000
with that done

657
00:21:00,559 --> 00:21:05,520
we are going to save our scene and

658
00:21:04,000 --> 00:21:07,679
continue

659
00:21:05,520 --> 00:21:10,080
uh player collision bodies in video

660
00:21:07,679 --> 00:21:12,400
games actually often

661
00:21:10,080 --> 00:21:13,520
cube capsules even if the player is some

662
00:21:12,400 --> 00:21:14,720
sort of complex thing just because it

663
00:21:13,520 --> 00:21:16,000
makes it easier to calculate what's

664
00:21:14,720 --> 00:21:17,760
going on with the environment and keep

665
00:21:16,000 --> 00:21:19,440
keep things simple

666
00:21:17,760 --> 00:21:21,679
big fancy games obviously do other

667
00:21:19,440 --> 00:21:22,880
things but simple video games are often

668
00:21:21,679 --> 00:21:24,320
just capsules so we're going to save our

669
00:21:22,880 --> 00:21:26,000
player scene there

670
00:21:24,320 --> 00:21:28,640
and rename the kinematic body to player

671
00:21:26,000 --> 00:21:30,080
and then save it again

672
00:21:28,640 --> 00:21:31,840
that's it for the player scene so we'll

673
00:21:30,080 --> 00:21:32,799
go back to the environment scene and i

674
00:21:31,840 --> 00:21:34,799
bet you can guess what we're going to do

675
00:21:32,799 --> 00:21:37,600
we're going to link the player scene as

676
00:21:34,799 --> 00:21:40,240
a child of environment

677
00:21:37,600 --> 00:21:42,400
now our little tic-tac-man is in here

678
00:21:40,240 --> 00:21:43,679
man woman tic-tac creature not sure why

679
00:21:42,400 --> 00:21:45,280
a tic-tac has a gender it doesn't need

680
00:21:43,679 --> 00:21:47,520
one uh

681
00:21:45,280 --> 00:21:49,120
it's a tic tac

682
00:21:47,520 --> 00:21:51,039
so

683
00:21:49,120 --> 00:21:54,240
it's a it's a it's a little capsule

684
00:21:51,039 --> 00:21:56,080
player i guess it does not have a gender

685
00:21:54,240 --> 00:21:57,760
you will uh you really really end up

686
00:21:56,080 --> 00:21:59,600
loving your your terrible shapes you use

687
00:21:57,760 --> 00:22:01,200
so don't get too attached to them

688
00:21:59,600 --> 00:22:02,799
we're going to rotate so click that

689
00:22:01,200 --> 00:22:03,919
player without it and rotate it so it's

690
00:22:02,799 --> 00:22:06,080
pointing the right way and then use the

691
00:22:03,919 --> 00:22:07,200
move tool to move it up

692
00:22:06,080 --> 00:22:08,000
it doesn't matter that it's above the

693
00:22:07,200 --> 00:22:09,039
ground because we're going to add

694
00:22:08,000 --> 00:22:10,320
gravity

695
00:22:09,039 --> 00:22:11,679
so for now it can just sit there

696
00:22:10,320 --> 00:22:13,919
floating

697
00:22:11,679 --> 00:22:15,200
that's totally fine

698
00:22:13,919 --> 00:22:16,640
so

699
00:22:15,200 --> 00:22:18,320
we're going to make yet another new

700
00:22:16,640 --> 00:22:20,480
scene

701
00:22:18,320 --> 00:22:22,720
we're going to go scene new scene this

702
00:22:20,480 --> 00:22:25,600
scene is very simple

703
00:22:22,720 --> 00:22:27,520
so we're going to create a rigid body

704
00:22:25,600 --> 00:22:29,919
which allows it to move in the physics

705
00:22:27,520 --> 00:22:29,919
system

706
00:22:30,000 --> 00:22:33,200
this is a little bit different because

707
00:22:31,440 --> 00:22:34,880
it needs to move around the scene in a

708
00:22:33,200 --> 00:22:36,080
different way so we'll cover that in a

709
00:22:34,880 --> 00:22:38,880
second we're going to add a mesh

710
00:22:36,080 --> 00:22:41,760
instance to our rigid body

711
00:22:38,880 --> 00:22:43,760
on our mesh we'll add a sphere

712
00:22:41,760 --> 00:22:45,919
and make an egregious color probably red

713
00:22:43,760 --> 00:22:49,600
i think this time

714
00:22:45,919 --> 00:22:49,600
nice egregious red

715
00:22:49,919 --> 00:22:53,360
we'll add a collision shape

716
00:22:52,400 --> 00:22:55,840
because we want this to be able to

717
00:22:53,360 --> 00:22:57,440
collide because it can move

718
00:22:55,840 --> 00:22:58,720
so we'll click our collision shape and

719
00:22:57,440 --> 00:23:01,120
add a sphere

720
00:22:58,720 --> 00:23:02,480
as the shape in the inspector

721
00:23:01,120 --> 00:23:04,080
it's a rigid body that can move in the

722
00:23:02,480 --> 00:23:05,840
physics engine which can move using

723
00:23:04,080 --> 00:23:07,200
impulses it has a mesh instance to show

724
00:23:05,840 --> 00:23:08,320
it's a ball

725
00:23:07,200 --> 00:23:10,320
and it has a collision shape which is

726
00:23:08,320 --> 00:23:12,720
also a ball or sphere and we'll save it

727
00:23:10,320 --> 00:23:14,080
as ball so ball.tscn and we'll rename

728
00:23:12,720 --> 00:23:15,919
the route to ball

729
00:23:14,080 --> 00:23:18,640
so it's just a ball we're going to save

730
00:23:15,919 --> 00:23:19,760
our ball scene back in the environment

731
00:23:18,640 --> 00:23:20,880
you'll know where this is going we're

732
00:23:19,760 --> 00:23:22,880
going to click environment and link the

733
00:23:20,880 --> 00:23:24,480
ball scene in

734
00:23:22,880 --> 00:23:25,679
and then we have a ball

735
00:23:24,480 --> 00:23:28,320
we're going to move the ball up to the

736
00:23:25,679 --> 00:23:28,320
upper platform

737
00:23:28,880 --> 00:23:31,919
so

738
00:23:30,400 --> 00:23:33,600
the center of all these objects is the

739
00:23:31,919 --> 00:23:35,760
same it's zero zero which is why they

740
00:23:33,600 --> 00:23:37,440
always start in the ground

741
00:23:35,760 --> 00:23:38,880
so they always kind of embed themselves

742
00:23:37,440 --> 00:23:40,480
in each other

743
00:23:38,880 --> 00:23:43,360
that's why so i'm just trying to move it

744
00:23:40,480 --> 00:23:44,720
over to the top platform

745
00:23:43,360 --> 00:23:46,880
so sometimes it gets a bit confusing in

746
00:23:44,720 --> 00:23:47,919
3d space so it's easy to use the the top

747
00:23:46,880 --> 00:23:49,600
view

748
00:23:47,919 --> 00:23:51,120
i am using a trackpad as i said at the

749
00:23:49,600 --> 00:23:52,880
beginning this is much easier if you

750
00:23:51,120 --> 00:23:54,240
have a mouse

751
00:23:52,880 --> 00:23:55,360
uh gravity will come to effect at some

752
00:23:54,240 --> 00:23:58,559
point so it doesn't matter that these

753
00:23:55,360 --> 00:24:00,720
things are currently floating

754
00:23:58,559 --> 00:24:02,080
next thing we need to do is make a goal

755
00:24:00,720 --> 00:24:03,679
so the goal of this game will be the

756
00:24:02,080 --> 00:24:04,640
player tic tac has to push the ball into

757
00:24:03,679 --> 00:24:07,279
a goal

758
00:24:04,640 --> 00:24:09,039
again new scene very simple

759
00:24:07,279 --> 00:24:10,880
making another spatial root note because

760
00:24:09,039 --> 00:24:13,039
this goal will not move around the scene

761
00:24:10,880 --> 00:24:14,240
that's the wrong kind of node

762
00:24:13,039 --> 00:24:17,360
i'm a fool

763
00:24:14,240 --> 00:24:19,440
i had a spatial node

764
00:24:17,360 --> 00:24:21,440
we do not need an audio stream player

765
00:24:19,440 --> 00:24:23,840
the spatial will be named goal as a

766
00:24:21,440 --> 00:24:27,039
child of this goal spatial node we're

767
00:24:23,840 --> 00:24:28,400
going to add a mesh instance once again

768
00:24:27,039 --> 00:24:29,440
and uh

769
00:24:28,400 --> 00:24:30,400
so yeah we're going to make a very

770
00:24:29,440 --> 00:24:31,760
simple game where you have to push the

771
00:24:30,400 --> 00:24:34,240
ball into goal into this goal we're

772
00:24:31,760 --> 00:24:36,080
going to call create a cube

773
00:24:34,240 --> 00:24:37,360
what color should this be

774
00:24:36,080 --> 00:24:39,120
this is

775
00:24:37,360 --> 00:24:41,360
very complicated decision making things

776
00:24:39,120 --> 00:24:44,240
certain colors uh let's go

777
00:24:41,360 --> 00:24:44,240
cyan maybe

778
00:24:44,559 --> 00:24:48,400
maybe maybe

779
00:24:46,799 --> 00:24:51,360
it's that's pretty gross that's probably

780
00:24:48,400 --> 00:24:52,640
the nicest color we've used so far today

781
00:24:51,360 --> 00:24:54,400
i'm gonna

782
00:24:52,640 --> 00:24:57,200
rearrange this a little bit and create

783
00:24:54,400 --> 00:24:59,039
the static uh collision body

784
00:24:57,200 --> 00:25:00,559
because it doesn't need to move

785
00:24:59,039 --> 00:25:02,400
and we're going to duplicate goal 1

786
00:25:00,559 --> 00:25:03,840
after renaming it

787
00:25:02,400 --> 00:25:05,039
no i don't duplicate i'm going to scale

788
00:25:03,840 --> 00:25:06,080
it a little bit and then i'll duplicate

789
00:25:05,039 --> 00:25:08,080
it

790
00:25:06,080 --> 00:25:10,000
smush it a bit

791
00:25:08,080 --> 00:25:12,080
smoosh it like that and smoosh it that

792
00:25:10,000 --> 00:25:14,240
way so it's like a pillar

793
00:25:12,080 --> 00:25:15,760
make it really tall

794
00:25:14,240 --> 00:25:17,600
that's good enough now i'm going to

795
00:25:15,760 --> 00:25:19,760
duplicate it and move it over a little

796
00:25:17,600 --> 00:25:21,600
bit with the move tool

797
00:25:19,760 --> 00:25:23,520
that's a goal i recognize that anywhere

798
00:25:21,600 --> 00:25:26,480
it's kind of goal posts really

799
00:25:23,520 --> 00:25:27,919
yeah that's good that's a goal

800
00:25:26,480 --> 00:25:28,880
so i can see someone kicking a football

801
00:25:27,919 --> 00:25:31,600
through that i'll save that as

802
00:25:28,880 --> 00:25:33,440
goals.tscn

803
00:25:31,600 --> 00:25:35,200
and uh i'll return back to my

804
00:25:33,440 --> 00:25:36,640
environment scene and you guessed it

805
00:25:35,200 --> 00:25:38,400
i'll link

806
00:25:36,640 --> 00:25:39,360
the goal scene into the environment

807
00:25:38,400 --> 00:25:42,799
scene

808
00:25:39,360 --> 00:25:44,559
with the link button bring in the goal

809
00:25:42,799 --> 00:25:46,559
amazing

810
00:25:44,559 --> 00:25:48,240
i'll move the goal somewhere maybe at

811
00:25:46,559 --> 00:25:50,559
the upper level i think today

812
00:25:48,240 --> 00:25:53,120
it doesn't really matter where it goes

813
00:25:50,559 --> 00:25:54,240
that's a good spot for it i think

814
00:25:53,120 --> 00:25:56,640
it's good

815
00:25:54,240 --> 00:25:58,559
yeah look at that that's nice goals over

816
00:25:56,640 --> 00:26:00,720
there that's pretty nice our game is

817
00:25:58,559 --> 00:26:02,480
taking shape

818
00:26:00,720 --> 00:26:05,200
amazing

819
00:26:02,480 --> 00:26:07,120
now we need to make

820
00:26:05,200 --> 00:26:09,039
a little pickup because this is a video

821
00:26:07,120 --> 00:26:10,720
game

822
00:26:09,039 --> 00:26:11,919
we'll make a little pickup that maybe

823
00:26:10,720 --> 00:26:13,360
does something if we get time it's a

824
00:26:11,919 --> 00:26:15,279
video game so video games have pickups

825
00:26:13,360 --> 00:26:16,480
it's very traditional again another

826
00:26:15,279 --> 00:26:19,039
scene

827
00:26:16,480 --> 00:26:20,960
we'll add an area so an area is

828
00:26:19,039 --> 00:26:23,440
something that exists to be collided

829
00:26:20,960 --> 00:26:25,039
with it doesn't necessarily have any

830
00:26:23,440 --> 00:26:26,559
visuals it just has an area that can

831
00:26:25,039 --> 00:26:28,799
tell some part of your game that

832
00:26:26,559 --> 00:26:29,600
something else has collided with it

833
00:26:28,799 --> 00:26:31,120
so

834
00:26:29,600 --> 00:26:32,799
it's a really useful kind of spatial

835
00:26:31,120 --> 00:26:34,320
volume that

836
00:26:32,799 --> 00:26:35,679
has a thing inside or doesn't have a

837
00:26:34,320 --> 00:26:36,799
thing inside it but can detect something

838
00:26:35,679 --> 00:26:38,799
being in there

839
00:26:36,799 --> 00:26:39,760
inside our area we will add a mesh

840
00:26:38,799 --> 00:26:40,880
instance because we're going to add a

841
00:26:39,760 --> 00:26:43,600
cube inside it because you know

842
00:26:40,880 --> 00:26:46,400
everything's a cube everything's a cube

843
00:26:43,600 --> 00:26:47,919
we'll uh go create a new color what

844
00:26:46,400 --> 00:26:49,760
color should this be that's the real

845
00:26:47,919 --> 00:26:52,240
question

846
00:26:49,760 --> 00:26:55,360
maybe do we have a dark purple maybe

847
00:26:52,240 --> 00:26:59,039
yeah oh yeah there we go

848
00:26:55,360 --> 00:26:59,039
our pickup is dark purple

849
00:26:59,200 --> 00:27:02,400
we'll add a collision shape to it

850
00:27:00,480 --> 00:27:04,720
because it's a thing that exists in the

851
00:27:02,400 --> 00:27:06,320
world it needs to be collided with

852
00:27:04,720 --> 00:27:07,840
and we'll go over to the shape and add a

853
00:27:06,320 --> 00:27:09,919
cube to our collision shape because the

854
00:27:07,840 --> 00:27:13,440
cube's collider is also a cube

855
00:27:09,919 --> 00:27:16,159
box not cube yep okay

856
00:27:13,440 --> 00:27:16,159
uh yep

857
00:27:17,520 --> 00:27:20,960
okay i've messed up the child there we

858
00:27:19,200 --> 00:27:22,320
go they both should be child of area

859
00:27:20,960 --> 00:27:24,000
rather than a child of each other there

860
00:27:22,320 --> 00:27:26,159
we go

861
00:27:24,000 --> 00:27:28,399
i'm going to rename the area to pick up

862
00:27:26,159 --> 00:27:29,919
and save the whole scene pickup.tscn and

863
00:27:28,399 --> 00:27:30,960
again back in environment i'll add my

864
00:27:29,919 --> 00:27:34,399
pickup

865
00:27:30,960 --> 00:27:37,120
so i'll select an environment and link

866
00:27:34,399 --> 00:27:38,480
in the pickup

867
00:27:37,120 --> 00:27:39,840
so we've got a nice pickup sitting in

868
00:27:38,480 --> 00:27:42,880
our environment now

869
00:27:39,840 --> 00:27:44,720
i'll move it over into the corner maybe

870
00:27:42,880 --> 00:27:46,080
good spot

871
00:27:44,720 --> 00:27:48,240
fantastic

872
00:27:46,080 --> 00:27:49,440
so the goal of our game is to push the

873
00:27:48,240 --> 00:27:50,960
ball through the goal and close the

874
00:27:49,440 --> 00:27:52,720
pickup it's a very complicated video

875
00:27:50,960 --> 00:27:53,919
game it's going to make a lot of money

876
00:27:52,720 --> 00:27:56,000
uh

877
00:27:53,919 --> 00:27:57,360
once we've done that i'll save it so

878
00:27:56,000 --> 00:27:58,559
you'll notice we haven't coded anything

879
00:27:57,360 --> 00:28:00,799
yet so

880
00:27:58,559 --> 00:28:02,320
it's probably time to code something if

881
00:28:00,799 --> 00:28:05,039
you run the game right now it will do

882
00:28:02,320 --> 00:28:06,159
absolutely nothing

883
00:28:05,039 --> 00:28:07,760
so

884
00:28:06,159 --> 00:28:09,120
you'll see that is running uh paris and

885
00:28:07,760 --> 00:28:10,799
tim's game thanks tim for helping me

886
00:28:09,120 --> 00:28:11,840
build this game originally

887
00:28:10,799 --> 00:28:13,520
we're gonna add a script now to make it

888
00:28:11,840 --> 00:28:15,039
actually do something

889
00:28:13,520 --> 00:28:16,480
i'm gonna click the player

890
00:28:15,039 --> 00:28:18,080
i'm going to right click on it and go

891
00:28:16,480 --> 00:28:19,039
attach script

892
00:28:18,080 --> 00:28:20,480
and it's going to ask me what sort of

893
00:28:19,039 --> 00:28:23,360
script i want i'm going to say i would

894
00:28:20,480 --> 00:28:23,360
like a gd script

895
00:28:23,679 --> 00:28:27,039
i've got to support c sharp gd script

896
00:28:25,679 --> 00:28:28,320
it's kind of native scripting and visual

897
00:28:27,039 --> 00:28:30,159
scripting which is kind of a block based

898
00:28:28,320 --> 00:28:32,480
one today we're going to use gd script

899
00:28:30,159 --> 00:28:34,399
which is a python inspired syntax but is

900
00:28:32,480 --> 00:28:35,600
not python

901
00:28:34,399 --> 00:28:36,960
it's a it's a really good little

902
00:28:35,600 --> 00:28:37,919
language

903
00:28:36,960 --> 00:28:39,360
it's going to ask us what to call it

904
00:28:37,919 --> 00:28:40,480
we're going to leave it by the default

905
00:28:39,360 --> 00:28:41,840
we're going to click create and it's

906
00:28:40,480 --> 00:28:43,679
going to open up the inbuilt editor you

907
00:28:41,840 --> 00:28:46,240
can use vs code or any other editor you

908
00:28:43,679 --> 00:28:49,600
like but goto has a competent perfectly

909
00:28:46,240 --> 00:28:51,039
communal in inbuilt editor

910
00:28:49,600 --> 00:28:52,159
we're going to gloss over this a little

911
00:28:51,039 --> 00:28:53,760
bit to be quick but we're going to get

912
00:28:52,159 --> 00:28:55,039
it done so we're going to create a

913
00:28:53,760 --> 00:28:57,039
variable

914
00:28:55,039 --> 00:28:58,720
with the var keyword

915
00:28:57,039 --> 00:29:00,159
we're going to call it move speed we're

916
00:28:58,720 --> 00:29:02,399
going to set it to 500 completely

917
00:29:00,159 --> 00:29:03,760
arbitrarily

918
00:29:02,399 --> 00:29:05,360
programming is about making numbers up

919
00:29:03,760 --> 00:29:07,440
as we know and video game programming is

920
00:29:05,360 --> 00:29:08,320
doubly about making numbers up

921
00:29:07,440 --> 00:29:10,559
we're going to create a direction

922
00:29:08,320 --> 00:29:14,480
variable which is a vector3 which is a

923
00:29:10,559 --> 00:29:14,480
vector with you know x y and z

924
00:29:15,279 --> 00:29:18,640
so once we've got our move speed and our

925
00:29:17,520 --> 00:29:21,120
direction

926
00:29:18,640 --> 00:29:22,880
we're going to continue going on here uh

927
00:29:21,120 --> 00:29:24,640
vector three if you're not used to it is

928
00:29:22,880 --> 00:29:27,600
just it stores three elements so for

929
00:29:24,640 --> 00:29:29,520
people are confused by that it has x y

930
00:29:27,600 --> 00:29:30,720
and z or whatever you would like to it's

931
00:29:29,520 --> 00:29:32,640
got three components well we'll use it

932
00:29:30,720 --> 00:29:34,159
as an x y and z

933
00:29:32,640 --> 00:29:36,480
it represents a direction uh we

934
00:29:34,159 --> 00:29:38,080
obviously need gravity as well

935
00:29:36,480 --> 00:29:39,039
so gravity in our little world is going

936
00:29:38,080 --> 00:29:40,960
to be

937
00:29:39,039 --> 00:29:42,960
9.8 i'm not sure where i got that from

938
00:29:40,960 --> 00:29:45,279
but uh obviously has no relationship to

939
00:29:42,960 --> 00:29:47,520
the real world but we'll see how it goes

940
00:29:45,279 --> 00:29:49,440
also velocity uh velocity is important

941
00:29:47,520 --> 00:29:51,279
in 3d space so our velocity is also

942
00:29:49,440 --> 00:29:52,799
going to be a vector3

943
00:29:51,279 --> 00:29:54,880
and uh

944
00:29:52,799 --> 00:29:56,960
that's all we need uh we're going to

945
00:29:54,880 --> 00:29:57,760
ignore ready so that doesn't really do

946
00:29:56,960 --> 00:29:59,360
anything

947
00:29:57,760 --> 00:30:00,320
uh ready it's called when a node enters

948
00:29:59,360 --> 00:30:02,159
the scene in godot we don't need to do

949
00:30:00,320 --> 00:30:03,600
anything special right now

950
00:30:02,159 --> 00:30:05,120
i'm going to create a new function

951
00:30:03,600 --> 00:30:07,120
called physics process which is the

952
00:30:05,120 --> 00:30:08,720
thing called every physics tick

953
00:30:07,120 --> 00:30:10,320
so goto has a bunch of predefined

954
00:30:08,720 --> 00:30:11,600
functions we can use to manipulate our

955
00:30:10,320 --> 00:30:13,360
game world

956
00:30:11,600 --> 00:30:14,720
they'll start with underscore

957
00:30:13,360 --> 00:30:15,919
so anything you make starts with no

958
00:30:14,720 --> 00:30:17,679
underscore anything that got a splice

959
00:30:15,919 --> 00:30:19,120
starts to underscore we're gonna set our

960
00:30:17,679 --> 00:30:22,399
direction to

961
00:30:19,120 --> 00:30:23,520
nothing zero vector three zero zero zero

962
00:30:22,399 --> 00:30:24,799
so we're trying to get you excited about

963
00:30:23,520 --> 00:30:26,720
gotta rather than teach you goto so i'm

964
00:30:24,799 --> 00:30:28,640
gonna gloss over this a little bit

965
00:30:26,720 --> 00:30:30,480
physics process gets kicked called every

966
00:30:28,640 --> 00:30:32,880
time the physics tick happens with the

967
00:30:30,480 --> 00:30:34,080
delta which is the time since last tick

968
00:30:32,880 --> 00:30:35,600
so the reason that might be different is

969
00:30:34,080 --> 00:30:37,840
the frame rate might be different to the

970
00:30:35,600 --> 00:30:39,919
physics tick so this lets us account for

971
00:30:37,840 --> 00:30:41,679
the difference

972
00:30:39,919 --> 00:30:43,760
so if input

973
00:30:41,679 --> 00:30:45,360
is action pressed so we're going to

974
00:30:43,760 --> 00:30:47,360
check if

975
00:30:45,360 --> 00:30:49,200
a certain action in the action table ui

976
00:30:47,360 --> 00:30:50,880
left which is whatever key we've mapped

977
00:30:49,200 --> 00:30:52,240
to left using god as action table and

978
00:30:50,880 --> 00:30:54,080
i'll show you where that's set in action

979
00:30:52,240 --> 00:30:56,320
in a second goto has a really powerful

980
00:30:54,080 --> 00:30:59,440
input system that lets you set

981
00:30:56,320 --> 00:31:00,720
named actions to certain keys so you can

982
00:30:59,440 --> 00:31:02,640
check for an actual key or you can check

983
00:31:00,720 --> 00:31:04,320
for a left right whatever it's a lot

984
00:31:02,640 --> 00:31:06,000
easier to name things like left or right

985
00:31:04,320 --> 00:31:07,279
so you can allow players or yourself to

986
00:31:06,000 --> 00:31:08,480
remap things

987
00:31:07,279 --> 00:31:10,559
so we're going to duplicate that for

988
00:31:08,480 --> 00:31:14,559
left right up and

989
00:31:10,559 --> 00:31:16,240
uh you guessed it down i can't type

990
00:31:14,559 --> 00:31:17,360
i might get the the directions wrong but

991
00:31:16,240 --> 00:31:18,640
i'm just going to take a guess right now

992
00:31:17,360 --> 00:31:20,000
so

993
00:31:18,640 --> 00:31:21,519
left is uh

994
00:31:20,000 --> 00:31:26,399
x1

995
00:31:21,519 --> 00:31:26,399
ui right is going to equal 2 minus 1

996
00:31:27,120 --> 00:31:30,799
minus 1

997
00:31:29,120 --> 00:31:32,960
yeah

998
00:31:30,799 --> 00:31:33,840
and

999
00:31:32,960 --> 00:31:35,840
yep

1000
00:31:33,840 --> 00:31:38,399
and we need so plus one for left minus

1001
00:31:35,840 --> 00:31:38,399
one for right

1002
00:31:40,480 --> 00:31:47,360
and z is our up

1003
00:31:43,919 --> 00:31:48,240
lowercase said not uppercase uh one

1004
00:31:47,360 --> 00:31:50,240
and

1005
00:31:48,240 --> 00:31:53,150
down

1006
00:31:50,240 --> 00:31:55,279
will will be uh

1007
00:31:53,150 --> 00:31:58,679
[Music]

1008
00:31:55,279 --> 00:31:58,679
minus one

1009
00:32:00,320 --> 00:32:05,039
right so yeah xyz

1010
00:32:03,760 --> 00:32:07,360
we want these keys to be able to move

1011
00:32:05,039 --> 00:32:09,200
the player around in the scene

1012
00:32:07,360 --> 00:32:10,960
now i can go project settings and you

1013
00:32:09,200 --> 00:32:12,640
can see where these are mapped

1014
00:32:10,960 --> 00:32:13,519
so in the input map you can see the ui

1015
00:32:12,640 --> 00:32:15,440
right

1016
00:32:13,519 --> 00:32:17,120
is mapped to a key or a d-pad so it's

1017
00:32:15,440 --> 00:32:18,320
mapped to uh

1018
00:32:17,120 --> 00:32:20,000
right

1019
00:32:18,320 --> 00:32:21,919
keyboard right

1020
00:32:20,000 --> 00:32:24,080
you can add your own name whatever you

1021
00:32:21,919 --> 00:32:25,440
like uh this is lets you abstract the

1022
00:32:24,080 --> 00:32:26,720
action away from the platform that

1023
00:32:25,440 --> 00:32:28,720
you're running the game on because goto

1024
00:32:26,720 --> 00:32:30,559
supports random consoles and ios and

1025
00:32:28,720 --> 00:32:32,640
gamepads and so on and so on and android

1026
00:32:30,559 --> 00:32:33,840
whatever you like

1027
00:32:32,640 --> 00:32:35,519
next thing we need to do is we're going

1028
00:32:33,840 --> 00:32:36,640
to normalize the direction so no matter

1029
00:32:35,519 --> 00:32:38,240
what direction we go when we're going at

1030
00:32:36,640 --> 00:32:41,880
the same speed so we're going to go

1031
00:32:38,240 --> 00:32:41,880
direction equals direction.normalized

1032
00:32:43,279 --> 00:32:47,760
if you want to do real game dev you need

1033
00:32:46,159 --> 00:32:49,840
to be okay with 3d movement it's not as

1034
00:32:47,760 --> 00:32:51,120
scary as it seems like it is

1035
00:32:49,840 --> 00:32:52,640
it's often

1036
00:32:51,120 --> 00:32:54,320
seems a lot scary than it actually is

1037
00:32:52,640 --> 00:32:55,519
it's quite okay

1038
00:32:54,320 --> 00:32:56,399
so

1039
00:32:55,519 --> 00:32:57,600
next thing

1040
00:32:56,399 --> 00:33:00,320
we're going to go

1041
00:32:57,600 --> 00:33:01,760
d equals d times move speed times delta

1042
00:33:00,320 --> 00:33:03,279
which basically makes it move at a nice

1043
00:33:01,760 --> 00:33:05,200
speed because we don't want to zoom off

1044
00:33:03,279 --> 00:33:07,279
in the distance too fast

1045
00:33:05,200 --> 00:33:08,480
that's pretty useful

1046
00:33:07,279 --> 00:33:09,760
so because this is being called every

1047
00:33:08,480 --> 00:33:10,640
physics tick we use the delta there as

1048
00:33:09,760 --> 00:33:11,919
well

1049
00:33:10,640 --> 00:33:13,679
uh because

1050
00:33:11,919 --> 00:33:15,840
if the frame weight

1051
00:33:13,679 --> 00:33:16,960
or the physics rate was inconsistent

1052
00:33:15,840 --> 00:33:18,480
then

1053
00:33:16,960 --> 00:33:20,320
not multiplying it by the delta would

1054
00:33:18,480 --> 00:33:21,760
mean the movement speed was jolty uh not

1055
00:33:20,320 --> 00:33:23,519
nice and smooth so this makes it nice

1056
00:33:21,760 --> 00:33:25,120
and smooth based on how your computer is

1057
00:33:23,519 --> 00:33:26,080
handling it

1058
00:33:25,120 --> 00:33:27,360
so

1059
00:33:26,080 --> 00:33:29,200
that just makes sure that handles it

1060
00:33:27,360 --> 00:33:32,159
properly

1061
00:33:29,200 --> 00:33:33,760
next thing we uh

1062
00:33:32,159 --> 00:33:35,519
if

1063
00:33:33,760 --> 00:33:37,360
we we want to fall faster than we jump

1064
00:33:35,519 --> 00:33:39,760
so if our velocity

1065
00:33:37,360 --> 00:33:42,320
on y is greater than zero so if we're

1066
00:33:39,760 --> 00:33:44,960
not jumping then we fall uh

1067
00:33:42,320 --> 00:33:48,320
if we are jumping then

1068
00:33:44,960 --> 00:33:50,240
the gravity is a different rate again

1069
00:33:48,320 --> 00:33:52,320
so video games are basically controlled

1070
00:33:50,240 --> 00:33:54,880
lying so gravity will affect us

1071
00:33:52,320 --> 00:33:56,480
differently when we jump basically uh

1072
00:33:54,880 --> 00:33:57,679
it's kind of like coyote time where you

1073
00:33:56,480 --> 00:33:59,679
know in the old cartoons when the kodi

1074
00:33:57,679 --> 00:34:01,200
falls off the uh the edge after being

1075
00:33:59,679 --> 00:34:03,919
off the edge already for a brief second

1076
00:34:01,200 --> 00:34:05,120
video games are basically that on a mass

1077
00:34:03,919 --> 00:34:06,640
scale

1078
00:34:05,120 --> 00:34:10,320
next thing we need to apply some gravity

1079
00:34:06,640 --> 00:34:11,520
so each physics step uh velocity on y

1080
00:34:10,320 --> 00:34:13,200
we

1081
00:34:11,520 --> 00:34:14,079
add some gravity

1082
00:34:13,200 --> 00:34:15,679
which is

1083
00:34:14,079 --> 00:34:17,760
multiplied by delta so it doesn't add

1084
00:34:15,679 --> 00:34:20,560
all the gravity at once

1085
00:34:17,760 --> 00:34:21,679
otherwise it'll just be be awful

1086
00:34:20,560 --> 00:34:23,200
that's uh

1087
00:34:21,679 --> 00:34:24,800
that's that

1088
00:34:23,200 --> 00:34:27,599
so once we've done that we also got

1089
00:34:24,800 --> 00:34:29,200
velocity.x equals direction.x so they're

1090
00:34:27,599 --> 00:34:30,800
the same

1091
00:34:29,200 --> 00:34:33,119
velocity is a three-part vector we also

1092
00:34:30,800 --> 00:34:35,280
need to z so direction.z so we only want

1093
00:34:33,119 --> 00:34:36,480
to modify the uh the y the the gravity

1094
00:34:35,280 --> 00:34:39,359
component of velocity we're not

1095
00:34:36,480 --> 00:34:40,320
modifying their otherwise velocity

1096
00:34:39,359 --> 00:34:41,520
so now we're going to actually make the

1097
00:34:40,320 --> 00:34:45,520
player move

1098
00:34:41,520 --> 00:34:47,919
so we're going to go velocity

1099
00:34:45,520 --> 00:34:48,879
and the velocity started at zero so

1100
00:34:47,919 --> 00:34:50,639
we're going to end with an actual

1101
00:34:48,879 --> 00:34:51,760
velocity we keep using

1102
00:34:50,639 --> 00:34:54,639
so we're going to use a function called

1103
00:34:51,760 --> 00:34:55,839
move and slide which is part of gotto

1104
00:34:54,639 --> 00:34:57,520
which basically

1105
00:34:55,839 --> 00:34:58,640
moves and hits stops you from hitting

1106
00:34:57,520 --> 00:35:00,800
something environment if it hits

1107
00:34:58,640 --> 00:35:01,760
something it comes to a stop

1108
00:35:00,800 --> 00:35:03,680
every game engine comes with an

1109
00:35:01,760 --> 00:35:05,839
equivalent of this function

1110
00:35:03,680 --> 00:35:08,000
move and slide is really quite useful

1111
00:35:05,839 --> 00:35:08,880
you can command click or control click

1112
00:35:08,000 --> 00:35:10,480
on

1113
00:35:08,880 --> 00:35:12,400
the function there and it gives you a

1114
00:35:10,480 --> 00:35:13,839
nice definition

1115
00:35:12,400 --> 00:35:14,960
moves the body along a vector if the

1116
00:35:13,839 --> 00:35:16,640
body collides with another body it will

1117
00:35:14,960 --> 00:35:17,760
slide along and stop

1118
00:35:16,640 --> 00:35:19,119
this means you don't have to calculate

1119
00:35:17,760 --> 00:35:20,880
all the fancy maths to move something

1120
00:35:19,119 --> 00:35:22,560
around in 3d space yourself and just

1121
00:35:20,880 --> 00:35:24,640
lets you use got it to do it so we floss

1122
00:35:22,560 --> 00:35:26,960
a velocity and a vector telling it which

1123
00:35:24,640 --> 00:35:29,839
way is uh up

1124
00:35:26,960 --> 00:35:32,960
and y is up

1125
00:35:29,839 --> 00:35:34,640
why why is up up is up

1126
00:35:32,960 --> 00:35:36,960
we also

1127
00:35:34,640 --> 00:35:38,880
want to be able to jump so if

1128
00:35:36,960 --> 00:35:40,560
is on floor which is another feature of

1129
00:35:38,880 --> 00:35:42,720
gotto

1130
00:35:40,560 --> 00:35:45,760
if we come and click on it it uh

1131
00:35:42,720 --> 00:35:47,440
returns true if the body is on the floor

1132
00:35:45,760 --> 00:35:49,200
so yeah it's very useful only updates

1133
00:35:47,440 --> 00:35:50,400
when calling move and slide uh it's

1134
00:35:49,200 --> 00:35:51,440
because the physics engine knows if

1135
00:35:50,400 --> 00:35:53,200
something is colliding with something

1136
00:35:51,440 --> 00:35:55,680
else that means it's on the floor

1137
00:35:53,200 --> 00:35:57,040
physics math can get hard really quickly

1138
00:35:55,680 --> 00:36:01,200
uh so we're gonna check if he's on floor

1139
00:35:57,040 --> 00:36:01,200
and input is action pressed

1140
00:36:01,520 --> 00:36:05,280
we're going to leave that blank for a

1141
00:36:03,440 --> 00:36:09,119
second and we'll come back to that

1142
00:36:05,280 --> 00:36:11,359
velocity dot y equals -10 so we want to

1143
00:36:09,119 --> 00:36:11,359
jump

1144
00:36:11,520 --> 00:36:16,160
yep 10 not a lot of 10 sorry yes

1145
00:36:14,160 --> 00:36:18,079
we want to go up that was an inverse

1146
00:36:16,160 --> 00:36:19,200
jump so if if we're on the floor and the

1147
00:36:18,079 --> 00:36:20,400
action press which will create the

1148
00:36:19,200 --> 00:36:22,640
second

1149
00:36:20,400 --> 00:36:24,320
is uh pressed so we're going to go into

1150
00:36:22,640 --> 00:36:26,720
our project settings

1151
00:36:24,320 --> 00:36:29,760
and in the input map and we're going to

1152
00:36:26,720 --> 00:36:31,680
go find game underscore jump

1153
00:36:29,760 --> 00:36:33,119
and click add

1154
00:36:31,680 --> 00:36:36,240
a game jump is at the end now i'm going

1155
00:36:33,119 --> 00:36:38,000
to map a key to that jump is a space bar

1156
00:36:36,240 --> 00:36:40,079
whoops

1157
00:36:38,000 --> 00:36:42,800
i want to map it to spacebar not control

1158
00:36:40,079 --> 00:36:44,160
add key space okay so now game

1159
00:36:42,800 --> 00:36:45,760
underscore jump action is mapped to

1160
00:36:44,160 --> 00:36:47,520
spacebar

1161
00:36:45,760 --> 00:36:50,480
so now i can provide the game underscore

1162
00:36:47,520 --> 00:36:52,720
jump action in that is action press call

1163
00:36:50,480 --> 00:36:55,440
it auto completes for me god is great

1164
00:36:52,720 --> 00:36:57,520
that's everything we need to do for now

1165
00:36:55,440 --> 00:36:59,200
in the script for our player so i'm

1166
00:36:57,520 --> 00:37:00,480
going to save player.gd with command s

1167
00:36:59,200 --> 00:37:02,240
or control s and go back into the

1168
00:37:00,480 --> 00:37:05,040
environment

1169
00:37:02,240 --> 00:37:06,480
i'm going to click my player

1170
00:37:05,040 --> 00:37:08,720
and the play now has a script attached

1171
00:37:06,480 --> 00:37:10,320
to it you can see over on the right side

1172
00:37:08,720 --> 00:37:11,599
there in the inspector player to duty

1173
00:37:10,320 --> 00:37:13,599
now i'm going to push command r to run

1174
00:37:11,599 --> 00:37:15,359
it and absolutely nothing will happen

1175
00:37:13,599 --> 00:37:17,280
because we haven't got a camera that was

1176
00:37:15,359 --> 00:37:18,880
deliberate by the way

1177
00:37:17,280 --> 00:37:20,240
very smooth it is doing things under the

1178
00:37:18,880 --> 00:37:21,599
hood but nothing is happening that we

1179
00:37:20,240 --> 00:37:23,200
can see

1180
00:37:21,599 --> 00:37:25,040
so i'm going to click the environment

1181
00:37:23,200 --> 00:37:26,480
and click plus for a new node and search

1182
00:37:25,040 --> 00:37:28,240
for a camera

1183
00:37:26,480 --> 00:37:29,760
and you'll see there's a camera node

1184
00:37:28,240 --> 00:37:31,680
guys got a bunch of cameras you've got

1185
00:37:29,760 --> 00:37:33,119
ar cameras and vr cameras all sorts of

1186
00:37:31,680 --> 00:37:34,320
stuff

1187
00:37:33,119 --> 00:37:36,320
you can see this frostum thing which

1188
00:37:34,320 --> 00:37:37,440
shows us where the camera is pointing so

1189
00:37:36,320 --> 00:37:38,560
you can see where the camera is pointing

1190
00:37:37,440 --> 00:37:39,520
with a little preview button so i'm

1191
00:37:38,560 --> 00:37:41,599
going to rotate the camera to have a

1192
00:37:39,520 --> 00:37:43,440
nice angle to make it slightly more

1193
00:37:41,599 --> 00:37:44,800
useful

1194
00:37:43,440 --> 00:37:46,720
that's slightly more useful a little bit

1195
00:37:44,800 --> 00:37:48,160
more rotation down and then we'll have a

1196
00:37:46,720 --> 00:37:49,440
nice camera

1197
00:37:48,160 --> 00:37:50,480
now if i run it we should have an actual

1198
00:37:49,440 --> 00:37:51,920
view

1199
00:37:50,480 --> 00:37:54,640
yep look at that oh we can move the

1200
00:37:51,920 --> 00:37:57,280
player with the mouse with the keyboard

1201
00:37:54,640 --> 00:37:59,200
you can even jump look at that

1202
00:37:57,280 --> 00:38:00,720
the the it falls a lot quicker than the

1203
00:37:59,200 --> 00:38:03,040
red it moves out which is great

1204
00:38:00,720 --> 00:38:05,200
everything seems to be working

1205
00:38:03,040 --> 00:38:07,760
the camera is not following the player

1206
00:38:05,200 --> 00:38:10,560
which is uh not very good but he he move

1207
00:38:07,760 --> 00:38:12,160
and slide works he hits the wall

1208
00:38:10,560 --> 00:38:14,560
they hit the wall it's doing very well

1209
00:38:12,160 --> 00:38:14,560
so far

1210
00:38:15,040 --> 00:38:19,520
we're going to continue improving this a

1211
00:38:17,040 --> 00:38:22,560
little bit

1212
00:38:19,520 --> 00:38:23,760
i can jump off the world too way

1213
00:38:22,560 --> 00:38:25,920
camera didn't follow me though so i'm

1214
00:38:23,760 --> 00:38:27,280
going to go back to godot

1215
00:38:25,920 --> 00:38:29,440
and i'm going to drag the camera onto

1216
00:38:27,280 --> 00:38:31,599
the player so now the camera is a child

1217
00:38:29,440 --> 00:38:33,839
of the player

1218
00:38:31,599 --> 00:38:36,079
the camera will now follow the player uh

1219
00:38:33,839 --> 00:38:38,400
this is a very crude camera follow you

1220
00:38:36,079 --> 00:38:39,839
could write a nice little script so the

1221
00:38:38,400 --> 00:38:41,359
player follows the camera follows the

1222
00:38:39,839 --> 00:38:43,839
play around like mario 64 so you have a

1223
00:38:41,359 --> 00:38:45,200
cameraman like a lerp and stuff a nice

1224
00:38:43,839 --> 00:38:46,880
flow but now the camera is following the

1225
00:38:45,200 --> 00:38:49,839
player at least so

1226
00:38:46,880 --> 00:38:50,960
this is a a lot better

1227
00:38:49,839 --> 00:38:53,119
i'm going to fix the key mapping because

1228
00:38:50,960 --> 00:38:55,200
the key map is actually backwards so i'm

1229
00:38:53,119 --> 00:38:57,839
going to go into

1230
00:38:55,200 --> 00:39:00,960
yeah okay just backwards forwards yep

1231
00:38:57,839 --> 00:39:02,480
go back into the gt script and modify

1232
00:39:00,960 --> 00:39:02,890
the key mapping

1233
00:39:02,480 --> 00:39:04,160
so

1234
00:39:02,890 --> 00:39:06,480
[Music]

1235
00:39:04,160 --> 00:39:09,520
plus equals one

1236
00:39:06,480 --> 00:39:11,599
yep and we're going to run that again

1237
00:39:09,520 --> 00:39:13,040
oh no

1238
00:39:11,599 --> 00:39:14,240
it's just rotated slightly sorry i've

1239
00:39:13,040 --> 00:39:16,640
got my keys around the wrong way so i'm

1240
00:39:14,240 --> 00:39:18,800
going to go ui

1241
00:39:16,640 --> 00:39:20,400
up

1242
00:39:18,800 --> 00:39:22,400
ui

1243
00:39:20,400 --> 00:39:23,599
down i'm 90 degrees relative to where i

1244
00:39:22,400 --> 00:39:26,480
needed to be

1245
00:39:23,599 --> 00:39:28,480
so you are left you are

1246
00:39:26,480 --> 00:39:30,079
right our left was forward

1247
00:39:28,480 --> 00:39:31,520
yeah

1248
00:39:30,079 --> 00:39:32,240
no strings so you need to yep there we

1249
00:39:31,520 --> 00:39:33,599
go

1250
00:39:32,240 --> 00:39:35,040
okay

1251
00:39:33,599 --> 00:39:36,240
perfect look at that now i can actually

1252
00:39:35,040 --> 00:39:37,680
control it

1253
00:39:36,240 --> 00:39:40,640
everything's working

1254
00:39:37,680 --> 00:39:43,359
now i can drive around get up the ramp

1255
00:39:40,640 --> 00:39:44,480
the a bit easy but there you have it

1256
00:39:43,359 --> 00:39:45,599
so we're going to make the goal work

1257
00:39:44,480 --> 00:39:49,280
next

1258
00:39:45,599 --> 00:39:51,440
i can push the ball oh look at that

1259
00:39:49,280 --> 00:39:52,800
okay there's no knowledge for the game

1260
00:39:51,440 --> 00:39:54,960
that it's called the goal though so

1261
00:39:52,800 --> 00:39:58,800
we're going to go into the environment

1262
00:39:54,960 --> 00:39:59,920
we're going to click on the uh ball

1263
00:39:58,800 --> 00:40:01,599
i'm going to tick the little box that

1264
00:39:59,920 --> 00:40:03,119
says can sleep

1265
00:40:01,599 --> 00:40:04,480
the ball's been falling asleep when it

1266
00:40:03,119 --> 00:40:06,800
doesn't move which means it doesn't

1267
00:40:04,480 --> 00:40:08,720
respond to physics very well

1268
00:40:06,800 --> 00:40:11,599
now pushing the ball around will be a

1269
00:40:08,720 --> 00:40:13,119
nice pleasant rolling experience

1270
00:40:11,599 --> 00:40:15,440
because the game was kind of putting the

1271
00:40:13,119 --> 00:40:17,119
physics system to sleep

1272
00:40:15,440 --> 00:40:19,680
look at that it rolls nicely instead of

1273
00:40:17,119 --> 00:40:21,040
just flying forward beautiful

1274
00:40:19,680 --> 00:40:23,119
i'm gonna add a little bit of code to

1275
00:40:21,040 --> 00:40:24,640
make the goal know when the uh the ball

1276
00:40:23,119 --> 00:40:26,000
has gone through it

1277
00:40:24,640 --> 00:40:28,960
so

1278
00:40:26,000 --> 00:40:30,560
first thing i'm going to do is go into

1279
00:40:28,960 --> 00:40:32,400
environment and add a script to the

1280
00:40:30,560 --> 00:40:35,200
environment

1281
00:40:32,400 --> 00:40:36,319
which will let us reset the game so this

1282
00:40:35,200 --> 00:40:39,319
means we have to restart the game

1283
00:40:36,319 --> 00:40:39,319
constantly

1284
00:40:40,079 --> 00:40:43,839
so uh tweaking the game is a lot easier

1285
00:40:41,680 --> 00:40:45,839
when you can reset the game in the

1286
00:40:43,839 --> 00:40:48,800
process uh call which is called every

1287
00:40:45,839 --> 00:40:50,480
frame i'm gonna go if input key pressed

1288
00:40:48,800 --> 00:40:51,920
key enter so unlike before where we

1289
00:40:50,480 --> 00:40:54,079
mapped a nice action we're going to

1290
00:40:51,920 --> 00:40:55,760
brute force map the enter key i'm going

1291
00:40:54,079 --> 00:40:58,240
to go get tree which just gets the whole

1292
00:40:55,760 --> 00:41:00,560
node tree and reload current scene so

1293
00:40:58,240 --> 00:41:02,720
now when i push enter the game resets

1294
00:41:00,560 --> 00:41:05,119
look at that beautiful

1295
00:41:02,720 --> 00:41:07,440
extremely useful

1296
00:41:05,119 --> 00:41:09,440
with that in place i'm going to go to

1297
00:41:07,440 --> 00:41:11,680
the uh

1298
00:41:09,440 --> 00:41:13,280
the goal

1299
00:41:11,680 --> 00:41:14,640
on the upper platform i'm going to add

1300
00:41:13,280 --> 00:41:16,400
an area so i'm going to move the scene a

1301
00:41:14,640 --> 00:41:17,760
little bit so i can see what's going on

1302
00:41:16,400 --> 00:41:19,280
i'm going to click on the upper floor

1303
00:41:17,760 --> 00:41:20,720
and i'm going to add an area to that

1304
00:41:19,280 --> 00:41:22,960
which is the same kind of volume thing

1305
00:41:20,720 --> 00:41:24,720
you saw earlier

1306
00:41:22,960 --> 00:41:26,960
there's the area

1307
00:41:24,720 --> 00:41:28,400
so i'm not adding the goal to the goals

1308
00:41:26,960 --> 00:41:30,640
scene i'm actually adding the goal to

1309
00:41:28,400 --> 00:41:32,400
the the main environment scenes it kind

1310
00:41:30,640 --> 00:41:34,800
of is overlapping the place where the

1311
00:41:32,400 --> 00:41:36,400
goal is in that scene just for detection

1312
00:41:34,800 --> 00:41:38,319
purposes and to make scripting slightly

1313
00:41:36,400 --> 00:41:40,480
easier so in that area i'm going to add

1314
00:41:38,319 --> 00:41:42,079
a collision shape

1315
00:41:40,480 --> 00:41:43,200
collision shape

1316
00:41:42,079 --> 00:41:45,440
and add a

1317
00:41:43,200 --> 00:41:48,160
box so this box basically says what

1318
00:41:45,440 --> 00:41:49,839
shape is the area that is detected this

1319
00:41:48,160 --> 00:41:51,520
is the area the invisible area that can

1320
00:41:49,839 --> 00:41:52,560
detect when something is inside it so

1321
00:41:51,520 --> 00:41:54,240
you can see the invisible area

1322
00:41:52,560 --> 00:41:55,760
represented by those uh

1323
00:41:54,240 --> 00:41:56,960
those lines

1324
00:41:55,760 --> 00:42:00,480
anytime the ball goes through the area

1325
00:41:56,960 --> 00:42:01,520
we score a goal this is a very easy game

1326
00:42:00,480 --> 00:42:03,359
i'm going to make a tiny bit thinner

1327
00:42:01,520 --> 00:42:05,200
just slightly less easy

1328
00:42:03,359 --> 00:42:08,800
that's better yep okay now it's not so

1329
00:42:05,200 --> 00:42:10,160
so easy uh with the goal ready to go we

1330
00:42:08,800 --> 00:42:12,560
need to actually do the scripting

1331
00:42:10,160 --> 00:42:14,800
component so we're gonna add a script to

1332
00:42:12,560 --> 00:42:17,200
the game to let us score that goal so

1333
00:42:14,800 --> 00:42:18,400
i'm going to click on the area

1334
00:42:17,200 --> 00:42:20,160
i'm going to go

1335
00:42:18,400 --> 00:42:22,160
node

1336
00:42:20,160 --> 00:42:23,359
and you'll see this node emits a bunch

1337
00:42:22,160 --> 00:42:25,040
of signals

1338
00:42:23,359 --> 00:42:27,040
so these signals are things that can be

1339
00:42:25,040 --> 00:42:30,960
connected up to code to make it do

1340
00:42:27,040 --> 00:42:32,800
things so the area emits a body entered

1341
00:42:30,960 --> 00:42:34,319
signal and tells us which body entered

1342
00:42:32,800 --> 00:42:36,000
it so i'm going to click body entered

1343
00:42:34,319 --> 00:42:37,040
click connect

1344
00:42:36,000 --> 00:42:38,480
it's going to ask me where i want to

1345
00:42:37,040 --> 00:42:40,480
connect it to

1346
00:42:38,480 --> 00:42:41,440
i'm going to connect to the environment

1347
00:42:40,480 --> 00:42:44,319
which

1348
00:42:41,440 --> 00:42:46,640
adds a on area body entered function to

1349
00:42:44,319 --> 00:42:47,760
the environment script that we created

1350
00:42:46,640 --> 00:42:49,839
so i'm going to delete the contents of

1351
00:42:47,760 --> 00:42:50,880
that and inside that i'm going to go if

1352
00:42:49,839 --> 00:42:53,119
body

1353
00:42:50,880 --> 00:42:54,640
is rigid body

1354
00:42:53,119 --> 00:42:57,040
which basically means it can only be the

1355
00:42:54,640 --> 00:42:57,040
player

1356
00:42:57,440 --> 00:43:01,359
i'm going to print hooray goal we

1357
00:42:59,839 --> 00:43:02,960
haven't got time to make a ui today but

1358
00:43:01,359 --> 00:43:04,800
uh this will print a nice little message

1359
00:43:02,960 --> 00:43:07,359
to the console when the player goes

1360
00:43:04,800 --> 00:43:07,359
through the goal

1361
00:43:07,760 --> 00:43:12,960
sorry the ball goes through the goal

1362
00:43:10,560 --> 00:43:15,040
i'm going to move up here i'm gonna push

1363
00:43:12,960 --> 00:43:18,240
the ball through the goal

1364
00:43:15,040 --> 00:43:19,359
and it says hooray goal

1365
00:43:18,240 --> 00:43:20,560
because it knows the ball has gone

1366
00:43:19,359 --> 00:43:22,720
through because it can only detect the

1367
00:43:20,560 --> 00:43:25,720
ball the ball is the rigid body

1368
00:43:22,720 --> 00:43:25,720
amazing

1369
00:43:26,000 --> 00:43:29,440
that's pretty much our whole game

1370
00:43:28,319 --> 00:43:30,640
i'm going to go quickly and make the

1371
00:43:29,440 --> 00:43:32,480
power up do something because we've got

1372
00:43:30,640 --> 00:43:35,359
a little bit of a second to do that i'm

1373
00:43:32,480 --> 00:43:35,359
going to click on the cube

1374
00:43:36,640 --> 00:43:39,520
i'm going to add a script to it

1375
00:43:38,240 --> 00:43:42,000
everything needs a script attached

1376
00:43:39,520 --> 00:43:43,200
script pick up inside that script i'm

1377
00:43:42,000 --> 00:43:46,000
going to

1378
00:43:43,200 --> 00:43:48,480
uncomment process so every single frame

1379
00:43:46,000 --> 00:43:54,160
please rotate so we're going to rotate

1380
00:43:48,480 --> 00:43:55,839
dot x underscore x deg to rad

1381
00:43:54,160 --> 00:43:57,119
so process is called literally every

1382
00:43:55,839 --> 00:44:00,720
frame

1383
00:43:57,119 --> 00:44:02,640
so we're going to uh basically rotate it

1384
00:44:00,720 --> 00:44:06,240
uh at the delta rate

1385
00:44:02,640 --> 00:44:07,280
on the x and rotate it on the y

1386
00:44:06,240 --> 00:44:08,960
we're going to run it and narrow our

1387
00:44:07,280 --> 00:44:12,160
cube we'll spin like a proper video game

1388
00:44:08,960 --> 00:44:14,640
power up so that was gotto hope you

1389
00:44:12,160 --> 00:44:16,079
enjoyed it uh please dive into it and

1390
00:44:14,640 --> 00:44:17,520
build more things or extend this silly

1391
00:44:16,079 --> 00:44:19,280
little game please tweet me little any

1392
00:44:17,520 --> 00:44:22,000
questions you have uh thank you for

1393
00:44:19,280 --> 00:44:23,520
watching hope you're all staying safe uh

1394
00:44:22,000 --> 00:44:25,839
you can export your game to mac linux

1395
00:44:23,520 --> 00:44:27,760
android consoles a whole bunch of things

1396
00:44:25,839 --> 00:44:29,280
thanks very much

1397
00:44:27,760 --> 00:44:31,200
hello everyone and thank you so much for

1398
00:44:29,280 --> 00:44:32,720
your talk paris i there was some great

1399
00:44:31,200 --> 00:44:34,480
chat in the

1400
00:44:32,720 --> 00:44:35,520
chat room during that which was really

1401
00:44:34,480 --> 00:44:38,079
great to see

1402
00:44:35,520 --> 00:44:39,359
um if you had any questions for paris i

1403
00:44:38,079 --> 00:44:41,440
hope you asked them during the chat that

1404
00:44:39,359 --> 00:44:43,040
was a really great presentation seems

1405
00:44:41,440 --> 00:44:45,440
like a really cool tool

1406
00:44:43,040 --> 00:44:46,880
uh next up we have a break

1407
00:44:45,440 --> 00:44:49,040
is a great time to get up stretch your

1408
00:44:46,880 --> 00:44:51,040
legs stretch your hands eat some food

1409
00:44:49,040 --> 00:44:52,960
drink some coffee pat your cats send

1410
00:44:51,040 --> 00:44:55,839
photos of the cats to the pets of lca

1411
00:44:52,960 --> 00:44:58,560
channel and venulis

1412
00:44:55,839 --> 00:45:00,079
or go to the linux agm which is at 12 30

1413
00:44:58,560 --> 00:45:01,200
and if you're a member of linux

1414
00:45:00,079 --> 00:45:03,200
australia you should have got an email

1415
00:45:01,200 --> 00:45:04,960
about that

1416
00:45:03,200 --> 00:45:07,359
so the next talk in this room is after

1417
00:45:04,960 --> 00:45:09,599
lunch at 1 30 pm aedt

1418
00:45:07,359 --> 00:45:11,520
uh from russell coca it's 20 years of

1419
00:45:09,599 --> 00:45:12,960
nsa security enhanced linux

1420
00:45:11,520 --> 00:45:15,599
retrospective

1421
00:45:12,960 --> 00:45:17,520
so i'll see you all uh there or in later

1422
00:45:15,599 --> 00:45:21,640
talk or later on

1423
00:45:17,520 --> 00:45:21,640
have great have a great lunch