osgShadow::OccluderGeometry Class Reference

OccluderGeometry provides a sepecialised geometry representation of objects in scene that occlude light and therefore cast shadows. More...

Inheritance diagram for osgShadow::OccluderGeometry:

[legend]

List of all members.

Public Types
typedef std::vector < osg::Vec3 >	Vec3List
typedef std::vector < GLuint >	UIntList
Public Member Functions
	OccluderGeometry ()
	OccluderGeometry (const OccluderGeometry &oc, const osg::CopyOp &copyop=osg::CopyOp::SHALLOW_COPY)
virtual Object *	cloneType () const
	Clone the type of an object, with Object* return type.
virtual Object *	clone (const osg::CopyOp &copyop) const
	Clone an object, with Object* return type.
virtual bool	isSameKindAs (const osg::Object *obj) const
virtual const char *	libraryName () const
	return the name of the object's library.
virtual const char *	className () const
	return the name of the object's class type.
void	computeOccluderGeometry (osg::Node *subgraph, osg::Matrix *matrix=0, float sampleRatio=1.0f)
	Compute an occluder geometry containing all the geometry in specified subgraph.
void	computeOccluderGeometry (osg::Drawable *drawable, osg::Matrix *matrix=0, float sampleRatio=1.0f)
	Compute an occluder geometry containing the geometry in specified drawable.
void	computeShadowVolumeGeometry (const osg::Vec4 &lightpos, ShadowVolumeGeometry &svg) const
	Compute ShadowVolumeGeometry.
void	setBoundingPolytope (const osg::Polytope &polytope)
	Set the bounding polytope of the OccluderGeometry.
osg::Polytope &	getBoundingPolytope ()
	Get the bounding polytope of the OccluderGeometry.
const osg::Polytope &	getBoundingPolytope () const
	Get the const bounding polytope of the OccluderGeometry.
virtual void	drawImplementation (osg::RenderInfo &renderInfo) const
	Render the occluder geometry.
virtual osg::BoundingBox	computeBound () const
	Compute the bounding box around occluder geometry.
void	processGeometry (osg::Drawable *drawable, osg::Matrix *matrix=0, float sampleRatio=1.0f)
Protected Types
typedef std::vector < Edge >	EdgeList
Protected Member Functions
virtual	~OccluderGeometry ()
bool	isLightPointSilhouetteEdge (const osg::Vec3 &lightpos, const Edge &edge) const
bool	isLightDirectionSilhouetteEdge (const osg::Vec3 &lightdirection, const Edge &edge) const
void	setUpInternalStructures ()
void	removeDuplicateVertices ()
void	removeNullTriangles ()
void	computeNormals ()
void	buildEdgeMaps ()
void	computeLightDirectionSilhouetteEdges (const osg::Vec3 &lightdirection, UIntList &silhouetteIndices) const
void	computeLightPositionSilhouetteEdges (const osg::Vec3 &lightpos, UIntList &silhouetteIndices) const
Protected Attributes
osg::Polytope	_boundingPolytope
Vec3List	_vertices
Vec3List	_normals
Vec3List	_triangleNormals
UIntList	_triangleIndices
EdgeList	_edges
Classes
struct	Edge

---

Detailed Description

OccluderGeometry provides a sepecialised geometry representation of objects in scene that occlude light and therefore cast shadows.

OccluderGeometry supports the computation of silhouette edges and shadow volume geometries, as well as use as geometry that one can rendering into a shadow map or end caps for the ZP+ algorithm. OccluderGeometry may be of the same resolution as an underlying geometry that it represents, or can be of lower resolution and combine manager seperate geometries together into a single shadow casting object. OccluderGeometry may be attached as UserData to Nodes or to Drawables.

---

Member Typedef Documentation

typedef std::vector<osg::Vec3> osgShadow::OccluderGeometry::Vec3List

typedef std::vector<GLuint> osgShadow::OccluderGeometry::UIntList

typedef std::vector<Edge> osgShadow::OccluderGeometry::EdgeList [protected]

---

Constructor & Destructor Documentation

osgShadow::OccluderGeometry::OccluderGeometry

(

)

osgShadow::OccluderGeometry::OccluderGeometry	(	const OccluderGeometry &	oc,
		const osg::CopyOp &	copyop = osg::CopyOp::SHALLOW_COPY
	)

virtual osgShadow::OccluderGeometry::~OccluderGeometry

(

)

[inline, protected, virtual]

---

Member Function Documentation

virtual Object* osgShadow::OccluderGeometry::cloneType

(

)

const [inline, virtual]

Clone the type of an object, with Object* return type.

Must be defined by derived classes.

Implements osg::Object.

virtual Object* osgShadow::OccluderGeometry::clone

(

const osg::CopyOp &

)

const [inline, virtual]

Clone an object, with Object* return type.

Must be defined by derived classes.

Implements osg::Object.

virtual bool osgShadow::OccluderGeometry::isSameKindAs

(

const osg::Object *

obj

)

const [inline, virtual]

Reimplemented from osg::Drawable.

virtual const char* osgShadow::OccluderGeometry::libraryName

(

)

const [inline, virtual]

return the name of the object's library.

Must be defined by derived classes. The OpenSceneGraph convention is that the namespace of a library is the same as the library name.

Reimplemented from osg::Drawable.

virtual const char* osgShadow::OccluderGeometry::className

(

)

const [inline, virtual]

return the name of the object's class type.

Must be defined by derived classes.

Reimplemented from osg::Drawable.

void osgShadow::OccluderGeometry::computeOccluderGeometry	(	osg::Node *	subgraph,
		osg::Matrix *	matrix = 0,
		float	sampleRatio = 1.0f
	)

Compute an occluder geometry containing all the geometry in specified subgraph.

void osgShadow::OccluderGeometry::computeOccluderGeometry	(	osg::Drawable *	drawable,
		osg::Matrix *	matrix = 0,
		float	sampleRatio = 1.0f
	)

Compute an occluder geometry containing the geometry in specified drawable.

void osgShadow::OccluderGeometry::computeShadowVolumeGeometry	(	const osg::Vec4 &	lightpos,
		ShadowVolumeGeometry &	svg
	)			const

Compute ShadowVolumeGeometry.

void osgShadow::OccluderGeometry::setBoundingPolytope

(

const osg::Polytope &

polytope

)

[inline]

Set the bounding polytope of the OccluderGeometry.

osg::Polytope& osgShadow::OccluderGeometry::getBoundingPolytope

(

)

[inline]

Get the bounding polytope of the OccluderGeometry.

const osg::Polytope& osgShadow::OccluderGeometry::getBoundingPolytope

(

)

const [inline]

Get the const bounding polytope of the OccluderGeometry.

virtual void osgShadow::OccluderGeometry::drawImplementation

(

osg::RenderInfo &

renderInfo

)

const [virtual]

Render the occluder geometry.

Implements osg::Drawable.

virtual osg::BoundingBox osgShadow::OccluderGeometry::computeBound

(

)

const [virtual]

Compute the bounding box around occluder geometry.

Reimplemented from osg::Drawable.

void osgShadow::OccluderGeometry::processGeometry	(	osg::Drawable *	drawable,
		osg::Matrix *	matrix = 0,
		float	sampleRatio = 1.0f
	)

bool osgShadow::OccluderGeometry::isLightPointSilhouetteEdge	(	const osg::Vec3 &	lightpos,
		const Edge &	edge
	)			const [inline, protected]

bool osgShadow::OccluderGeometry::isLightDirectionSilhouetteEdge	(	const osg::Vec3 &	lightdirection,
		const Edge &	edge
	)			const [inline, protected]

void osgShadow::OccluderGeometry::setUpInternalStructures

(

)

[protected]

void osgShadow::OccluderGeometry::removeDuplicateVertices

(

)

[protected]

void osgShadow::OccluderGeometry::removeNullTriangles

(

)

[protected]

void osgShadow::OccluderGeometry::computeNormals

(

)

[protected]

void osgShadow::OccluderGeometry::buildEdgeMaps

(

)

[protected]

void osgShadow::OccluderGeometry::computeLightDirectionSilhouetteEdges	(	const osg::Vec3 &	lightdirection,
		UIntList &	silhouetteIndices
	)			const [protected]

void osgShadow::OccluderGeometry::computeLightPositionSilhouetteEdges	(	const osg::Vec3 &	lightpos,
		UIntList &	silhouetteIndices
	)			const [protected]

---

Member Data Documentation

osg::Polytope osgShadow::OccluderGeometry::_boundingPolytope [protected]

Vec3List osgShadow::OccluderGeometry::_vertices [protected]

Vec3List osgShadow::OccluderGeometry::_normals [protected]

Vec3List osgShadow::OccluderGeometry::_triangleNormals [protected]

UIntList osgShadow::OccluderGeometry::_triangleIndices [protected]

EdgeList osgShadow::OccluderGeometry::_edges [protected]

---

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

• OccluderGeometry

---