# 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.

## Public Attributes

Vector3 | mPosition
Vector3 | mDirection
BillboardSet * | mParentSet
ColourValue | mColour
Radian | mRotation

## Protected Attributes

bool | mOwnDimensions
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 57 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 91 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

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

| Resets this Billboard to use the parent BillboardSet's dimensions instead of it's own. Definition at line 130 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.

## Friends And Related Function Documentation

friend class BillboardParticleRenderer `[friend]`

| Definition at line 60 of file OgreBillboard.h.

friend class BillboardSet `[friend]`

| Definition at line 59 of file OgreBillboard.h.

## Member Data Documentation

ColourValue Ogre::Billboard::mColour

| Definition at line 72 of file OgreBillboard.h.

Vector3 Ogre::Billboard::mDirection

| Definition at line 70 of file OgreBillboard.h.

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

| Definition at line 64 of file OgreBillboard.h.

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

| Definition at line 62 of file OgreBillboard.h.

BillboardSet* Ogre::Billboard::mParentSet

| Definition at line 71 of file OgreBillboard.h.

Vector3 Ogre::Billboard::mPosition

| Definition at line 68 of file OgreBillboard.h.

Radian Ogre::Billboard::mRotation

| Definition at line 73 of file OgreBillboard.h.

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

| Definition at line 63 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 Feb 12 13:00:07 2006