class SG_EXPORT osg::ImpostorSprite

An ImposterSprite is a textured quad which is rendered in place a 3D geometry.

Inheritance:

Public Methods

ImpostorSprite()

virtual Object* clone() const

virtual bool isSameKindAs(const Object* obj) const

virtual const char* className() const

void setParent(Impostor* parent)

Set the parent, which must be an Impostor.

Impostor* getParent()

Get the parent, which is an Impostor.

const Impostor* getParent() const

Get the const parent, which is an Impostor.

inline void setStoredLocalEyePoint(const Vec3& v)

Set the eye point for when the ImpsotorSprite was snapped

inline const Vec3& getStoredLocalEyePoint() const

Get the eye point for when the ImpsotorSprite was snapped

inline void setLastFrameUsed(const int frameNumber)

Set the frame number for when the ImpostorSprite was last used in rendering

inline int getLastFrameUsed() const

Get the frame number for when the ImpostorSprite was last used in rendering

inline Vec3* getCoords()

Get the coordinates of the corners of the quad.

inline const Vec3* getCoords() const

Get the const coordinates of the corners of the quad

inline Vec2* getTexCoords()

Get the texture coordinates of the corners of the quad.

inline const Vec2* getTexCoords() const

Get the const texture coordinates of the corners of the quad

inline Vec3* getControlCoords()

Get the control coordinates of the corners of the quad.

inline const Vec3* getControlCoords() const

Get the const control coordinates of the corners of the quad

const float calcPixelError(const Camera& camera, const Viewport& viewport, const osg::Matrix* matrix) const

calculate the pixel error value for current camera position and object position

void setTexture(Texture* tex, int s, int t)

Texture* getTexture()

const Texture* getTexture() const

const int s() const

const int t() const

virtual void drawImmediateMode(State& state)

draw ImpostorSprite directly.

Protected Fields

Impostor* _parent

ImpostorSpriteManager* _ism

ImpostorSprite* _previous

ImpostorSprite* _next

int _lastFrameUsed

Vec3 _storedLocalEyePoint

Vec3 _coords[4]

Vec2 _texcoords[4]

Vec3 _controlcoords[4]

Texture* _texture

int _s

int _t

Protected Methods

ImpostorSprite(const ImpostorSprite&)

ImpostorSprite& operator = (const ImpostorSprite&)

virtual ~ImpostorSprite()

virtual const bool computeBound() const

Inherited from Drawable:

Public Methods

inline void setStateSet(StateSet* state)

inline StateSet* getStateSet()

inline const StateSet* getStateSet() const

void setSupportsDisplayList(const bool flag)

inline const bool getSupportsDisplayList() const

void setUseDisplayList(const bool flag)

inline const bool getUseDisplayList() const

void dirtyDisplayList()

inline void dirtyBound()

inline const BoundingBox& getBound() const

inline void draw(State& state)

void compile(State& state)

static void deleteDisplayList(uint contextID, uint globj)

static void flushDeletedDisplayLists(uint contextID)

Protected Fields

ref_ptr<StateSet> _dstate

bool _supportsDisplayList

bool _useDisplayList

mutable BoundingBox _bbox

mutable bool _bbox_computed

Protected Members

typedef std::vector<uint> GLObjectList mutable GLObjectList _globjList

typedef std::map<uint,std::set<uint> >static DeletedDisplayListCache DeletedDisplayListCache s_deletedDisplayListCache

Inherited from Object:

Inherited from Referenced:

Public Methods

inline void ref() const

inline void unref() const

inline const int referenceCount() const

Protected Fields

mutable int _refCount

Documentation

An ImposterSprite is a textured quad which is rendered in place a 3D geometry. The ImposterSprite is generated by rendering the original 3D geometry to a texture as an image cache. The ImpostorSprite is automatiacally generatated by the osgUtil::CullVisitor so it not necessary to deal with it directly.

ImpostorSprite()

virtual Object* clone() const

virtual bool isSameKindAs(const Object* obj) const

virtual const char* className() const

void setParent(Impostor* parent)

Set the parent, which must be an Impostor. Unlike conventional Drawables, ImpostorSprite's can only ever have one parent.

Impostor* getParent()

Get the parent, which is an Impostor.

const Impostor* getParent() const

Get the const parent, which is an Impostor.

inline void setStoredLocalEyePoint(const Vec3& v)

Set the eye point for when the ImpsotorSprite was snapped

inline const Vec3& getStoredLocalEyePoint() const

Get the eye point for when the ImpsotorSprite was snapped

inline void setLastFrameUsed(const int frameNumber)

Set the frame number for when the ImpostorSprite was last used in rendering

inline int getLastFrameUsed() const

Get the frame number for when the ImpostorSprite was last used in rendering

inline Vec3* getCoords()

Get the coordinates of the corners of the quad. Stored in the order, [0] - top_left, [1] - bottom_left, [2] - bottom_right, [3] - top_left.

inline const Vec3* getCoords() const

Get the const coordinates of the corners of the quad

inline Vec2* getTexCoords()

Get the texture coordinates of the corners of the quad. Stored in the order, [0] - top_left, [1] - bottom_left, [2] - bottom_right, [3] - top_left.

inline const Vec2* getTexCoords() const

Get the const texture coordinates of the corners of the quad

inline Vec3* getControlCoords()

Get the control coordinates of the corners of the quad. The control coordinates are the cornders of the quad projected out onto the front face of bounding box which enclosed the impostor geometry when it was pre-rendered into the impostor sprite's texture. At the point of creation/or update of the impostor sprite the control coords will lie ontop of the coorners of the quad in screen space - with a pixel error or zero. Once the camera moves relative to the impostor sprite the control coords will nolonger lie ontop of the corners of the quad in screen space - a pixel error will have accumulated. This pixel error can then be used to dertermine whether the impostor needs to be updated. Stored in the order, [0] - top_left, [1] - bottom_left, [2] - bottom_right, [3] - top_left.

inline const Vec3* getControlCoords() const

Get the const control coordinates of the corners of the quad

const float calcPixelError(const Camera& camera, const Viewport& viewport, const osg::Matrix* matrix) const

calculate the pixel error value for current camera position and object position

void setTexture(Texture* tex, int s, int t)

Texture* getTexture()

const Texture* getTexture() const

const int s() const

const int t() const

virtual void drawImmediateMode(State& state)

draw ImpostorSprite directly.

ImpostorSprite(const ImpostorSprite&)

ImpostorSprite& operator = (const ImpostorSprite&)

virtual ~ImpostorSprite()

virtual const bool computeBound() const

Impostor* _parent

ImpostorSpriteManager* _ism

ImpostorSprite* _previous

ImpostorSprite* _next

int _lastFrameUsed

Vec3 _storedLocalEyePoint

Vec3 _coords[4]

Vec2 _texcoords[4]

Vec3 _controlcoords[4]

Texture* _texture

int _s

int _t

This class has no child classes.

Friends:

ImpostorSpriteManager

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