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# Ogre::Billboard Class Reference

A billboard is a primitive which always faces the camera in every frame. More...

`#include <OgreBillboard.h>`

List of all members.

## Public Member Functions
| Billboard ()
| Default constructor.
| ~Billboard ()
| Default destructor.
| Billboard (const Vector3 &position, BillboardSet *owner, const ColourValue &colour=ColourValue::White)
| Normal constructor as called by BillboardSet.
const Radian & | getRotation (void) const
| Get the rotation of the billboard.
void | setRotation (const Radian &rotation)
| Set the rotation of the billboard.
void | setPosition (const Vector3 &position)
| Set the position of the billboard.
void | setPosition (Real x, Real y, Real z)
| Set the position of the billboard.
const Vector3 & | getPosition (void) const
| Get the position of the billboard.
void | setDimensions (Real width, Real height)
| Sets the width and height for this billboard.
void | resetDimensions (void)
| Resets this Billboard to use the parent BillboardSet's dimensions instead of it's own.
void | setColour (const ColourValue &colour)
| Sets the colour of this billboard.
const ColourValue & | getColour (void) const
| Gets the colour of this billboard.
bool | hasOwnDimensions (void) const
| Returns true if this billboard deviates from the BillboardSet's default dimensions (i.e.
Real | getOwnWidth (void) const
| Retrieves the billboard's personal width, if hasOwnDimensions is true.
Real | getOwnHeight (void) const
| Retrieves the billboard's personal width, if hasOwnDimensions is true.
void | _notifyOwner (BillboardSet *owner)
| Internal method for notifying the billboard of it's owner.
bool | isUseTexcoordRect (void) const
| Returns true if this billboard use individual texture coordinate rect (i.e.
void | setTexcoordIndex (uint16 texcoordIndex)
| setTexcoordIndex() sets which texture coordinate rect this billboard will use when rendering.
uint16 | getTexcoordIndex (void) const
| getTexcoordIndex() returns the previous value set by setTexcoordIndex().
void | setTexcoordRect (const FloatRect &texcoordRect)
| setTexcoordRect() sets the individual texture coordinate rect of this billboard will use when rendering.
void | setTexcoordRect (Real u0, Real v0, Real u1, Real v1)
| setTexcoordRect() sets the individual texture coordinate rect of this billboard will use when rendering.
const FloatRect & | getTexcoordRect (void) const
| getTexcoordRect() returns the previous value set by setTexcoordRect().
## Public Attributes
Vector3 | mPosition
Vector3 | mDirection
BillboardSet * | mParentSet
ColourValue | mColour
Radian | mRotation
## Protected Attributes
bool | mOwnDimensions
bool | mUseTexcoordRect
uint16 | mTexcoordIndex
FloatRect | mTexcoordRect
Real | mWidth
Real | mHeight
## Friends
class | BillboardSet
class | BillboardParticleRenderer

## Detailed Description

A billboard is a primitive which always faces the camera in every frame.

Remarks:
  Billboards can be used for special effects or some other trickery which requires the triangles to always facing the camera no matter where it is. Ogre groups billboards into sets for efficiency, so you should never create a billboard on it's own (it's ok to have a set of one if you need it).

  Billboards have their geometry generated every frame depending on where the camera is. It is most beneficial for all billboards in a set to be identically sized since Ogre can take advantage of this and save some calculations - useful when you have sets of hundreds of billboards as is possible with special effects. You can deviate from this if you wish (example: a smoke effect would probably have smoke puffs expanding as they rise, so each billboard will legitimately have it's own size) but be aware the extra overhead this brings and try to avoid it if you can.

  Billboards are just the mechanism for rendering a range of effects such as particles. It is other classes which use billboards to create their individual effects, so the methods here are quite generic.

See also:
  BillboardSet

Definition at line 61 of file OgreBillboard.h.

## Constructor & Destructor Documentation

Ogre::Billboard::Billboard | ( |  | ) |

| Default constructor.

Ogre::Billboard::~Billboard | ( |  | ) |

| Default destructor.

Ogre::Billboard::Billboard | ( | const Vector3 & | position,
|  | BillboardSet * | owner,
|  | const ColourValue & | colour = `ColourValue::White`
| ) |

| Normal constructor as called by BillboardSet.

## Member Function Documentation

void Ogre::Billboard::_notifyOwner | ( | BillboardSet * | owner | ) |

| Internal method for notifying the billboard of it's owner.

const ColourValue& Ogre::Billboard::getColour | ( | void |  | ) | const

| Gets the colour of this billboard.

Real Ogre::Billboard::getOwnHeight | ( | void |  | ) | const

| Retrieves the billboard's personal width, if hasOwnDimensions is true.

Real Ogre::Billboard::getOwnWidth | ( | void |  | ) | const

| Retrieves the billboard's personal width, if hasOwnDimensions is true.

const Vector3& Ogre::Billboard::getPosition | ( | void |  | ) | const

| Get the position of the billboard. Remarks: This position is relative to a point on the quad which is the billboard. Depending on the BillboardSet, this may be the center of the quad, the top-left etc. See BillboardSet::setBillboardOrigin for more info.

const Radian& Ogre::Billboard::getRotation | ( | void |  | ) | const

| Get the rotation of the billboard. Remarks: This rotation is relative to the center of the billboard. Definition at line 98 of file OgreBillboard.h.

uint16 Ogre::Billboard::getTexcoordIndex | ( | void |  | ) | const

| getTexcoordIndex() returns the previous value set by setTexcoordIndex(). The default value is 0, which is always a valid texture coordinate set. Remarks: This value is useful only when isUseTexcoordRect return false. Definition at line 192 of file OgreBillboard.h.

const FloatRect& Ogre::Billboard::getTexcoordRect | ( | void |  | ) | const

| getTexcoordRect() returns the previous value set by setTexcoordRect(). Remarks: This value is useful only when isUseTexcoordRect return true. Definition at line 212 of file OgreBillboard.h.

bool Ogre::Billboard::hasOwnDimensions | ( | void |  | ) | const

| Returns true if this billboard deviates from the BillboardSet's default dimensions (i.e. if the Billboard::setDimensions method has been called for this instance). See also: Billboard::setDimensions

bool Ogre::Billboard::isUseTexcoordRect | ( | void |  | ) | const

| Returns true if this billboard use individual texture coordinate rect (i.e. if the Billboard::setTexcoordRect method has been called for this instance), or returns false if use texture coordinates defined in the parent BillboardSet's texture coordinates array (i.e. if the Billboard::setTexcoordIndex method has been called for this instance). See also: Billboard::setTexcoordIndex() Billboard::setTexcoordRect() Definition at line 176 of file OgreBillboard.h.

void Ogre::Billboard::resetDimensions | ( | void |  | ) |

| Resets this Billboard to use the parent BillboardSet's dimensions instead of it's own. Definition at line 137 of file OgreBillboard.h.

void Ogre::Billboard::setColour | ( | const ColourValue & | colour | ) |

| Sets the colour of this billboard. Remarks: Billboards can be tinted based on a base colour. This allows variations in colour irresective of the base colour of the material allowing more varied billboards. The default colour is white. The tinting is effected using vertex colours.

void Ogre::Billboard::setDimensions | ( | Real | width,
|  | Real | height
| ) |

| Sets the width and height for this billboard. Remarks: Note that it is most efficient for every billboard in a BillboardSet to have the same dimensions. If you choose to alter the dimensions of an individual billboard the set will be less efficient. Do not call this method unless you really need to have different billboard dimensions within the same set. Otherwise just call the BillboardSet::setDefaultDimensions method instead.

void Ogre::Billboard::setPosition | ( | Real | x,
|  | Real | y,
|  | Real | z
| ) |

| Set the position of the billboard. Remarks: This position is relative to a point on the quad which is the billboard. Depending on the BillboardSet, this may be the center of the quad, the top-left etc. See BillboardSet::setBillboardOrigin for more info.

void Ogre::Billboard::setPosition | ( | const Vector3 & | position | ) |

| Set the position of the billboard. Remarks: This position is relative to a point on the quad which is the billboard. Depending on the BillboardSet, this may be the center of the quad, the top-left etc. See BillboardSet::setBillboardOrigin for more info.

void Ogre::Billboard::setRotation | ( | const Radian & | rotation | ) |

| Set the rotation of the billboard. Remarks: This rotation is relative to the center of the billboard.

void Ogre::Billboard::setTexcoordIndex | ( | uint16 | texcoordIndex | ) |

| setTexcoordIndex() sets which texture coordinate rect this billboard will use when rendering. The parent billboard set may contain more than one, in which case a billboard can be textured with different pieces of a larger texture sheet very efficiently. See also: BillboardSet::setTextureCoords()

void Ogre::Billboard::setTexcoordRect | ( | Real | u0,
|  | Real | v0,
|  | Real | u1,
|  | Real | v1
| ) |

| setTexcoordRect() sets the individual texture coordinate rect of this billboard will use when rendering. The parent billboard set may contain more than one, in which case a billboard can be textured with different pieces of a larger texture sheet very efficiently.

void Ogre::Billboard::setTexcoordRect | ( | const FloatRect & | texcoordRect | ) |

| setTexcoordRect() sets the individual texture coordinate rect of this billboard will use when rendering. The parent billboard set may contain more than one, in which case a billboard can be textured with different pieces of a larger texture sheet very efficiently.

## Friends And Related Function Documentation

friend class BillboardParticleRenderer`[friend]`

| Definition at line 64 of file OgreBillboard.h.

friend class BillboardSet`[friend]`

| Definition at line 63 of file OgreBillboard.h.

## Member Data Documentation

ColourValue Ogre::Billboard::mColour

| Definition at line 79 of file OgreBillboard.h.

Vector3 Ogre::Billboard::mDirection

| Definition at line 77 of file OgreBillboard.h.

Real Ogre::Billboard::mHeight`[protected]`

| Definition at line 71 of file OgreBillboard.h.

bool Ogre::Billboard::mOwnDimensions`[protected]`

| Definition at line 66 of file OgreBillboard.h.

BillboardSet* Ogre::Billboard::mParentSet

| Definition at line 78 of file OgreBillboard.h.

Vector3 Ogre::Billboard::mPosition

| Definition at line 75 of file OgreBillboard.h.

Radian Ogre::Billboard::mRotation

| Definition at line 80 of file OgreBillboard.h.

uint16 Ogre::Billboard::mTexcoordIndex`[protected]`

| Definition at line 68 of file OgreBillboard.h.

FloatRect Ogre::Billboard::mTexcoordRect`[protected]`

| Definition at line 69 of file OgreBillboard.h.

bool Ogre::Billboard::mUseTexcoordRect`[protected]`

| Definition at line 67 of file OgreBillboard.h.

Real Ogre::Billboard::mWidth`[protected]`

| Definition at line 70 of file OgreBillboard.h.

The documentation for this class was generated from the following file:

- OgreBillboard.h

Copyright © 2000-2005 by The OGRE Team
This work is licensed under a Creative Commons Attribution-ShareAlike 2.5 License.
Last modified Sun Sep 30 10:51:03 2007