class OSGUTIL_EXPORT osgUtil::Tesselator

Originally a simple class for tessellating a single polygon boundary.

Inheritance:

Public Classes

enum WindingType

The winding rule, see red book ch 11.

enum TesselationType

we interpret all contours in the geometry as a single set to be tesselated or each separate drawable's contours needs to be tesselated.

struct Prim: public osg::Referenced

Public Methods

Tesselator()

~Tesselator()

void setBoundaryOnly(const bool tt)

Set and get tesselation request boundary only on/off

inline const bool getBoundaryOnly( )

void setWindingType(const WindingType wt)

Set and get tesselation windong rule

inline const WindingType getWindingType( )

void setTesselationType(const TesselationType tt)

Set and get tesselation type

inline const TesselationType getTesselationType( )

void retesselatePolygons(osg::Geometry &cxgeom)

Change the contours lists of the geometry into tesselated primitives (the list of primitives in the original geometry is stored in the tesselator for possible re-use.

osg::Geometry::PrimitiveSetList getContours()

void beginTesselation()

void beginContour()

void addVertex(osg::Vec3* vertex)

void endContour()

void endTesselation()

PrimList& getPrimList()

void reset()

Public

typedef std::vector<osg::Vec3*> VertexPointList

typedef std::vector< osg::ref_ptr<Prim> > PrimList

Protected Classes

struct Vec3d

struct NewVertex

Protected Fields

GLUtesselator* _tobj

PrimList _primList

Vec3dList _coordData

NewVertexList _newVertexList

GLenum _errorCode

WindingType _wtype

winding rule, which parts will become solid

TesselationType _ttype

tesselation rule, which parts will become solid

bool _boundaryOnly

unsigned int _numberVerts

number of vertices that are part of the 'original' set of contours

osg::Geometry::PrimitiveSetList _Contours

List of primitives that define the contours

unsigned int _index

count number of primitives in a geometry to get right no.

Protected Methods

void reduceArray(osg::Array* cold, const unsigned int nnu)

remove unused parts of the array, eg for wehn retesselating tesselation can introduce extra vertices for concave or crossing boundaries, these will leak memory if not removed when retesselating.

void collectTesselation(osg::Geometry &cxgeom)

void addContour(osg::PrimitiveSet* primitive, osg::Vec3Array* vertices)

void handleNewVertices(osg::Geometry& geom, VertexPtrToIndexMap &vertexPtrToIndexMap)

void begin(GLenum mode)

void vertex(osg::Vec3* vertex)

void combine(osg::Vec3* vertex, void* vertex_data[4], GLfloat weight[4])

void end()

void error(GLenum errorCode)

static void CALLBACK beginCallback(GLenum which, void* userData)

static void CALLBACK vertexCallback(GLvoid* data, void* userData)

static void CALLBACK combineCallback(GLdouble coords[3], void* vertex_data[4], GLfloat weight[4], void** outData, void* useData)

static void CALLBACK endCallback(void* userData)

static void CALLBACK errorCallback(GLenum errorCode, void* userData)

Protected

typedef std::map<osg::Vec3*,unsigned int> VertexPtrToIndexMap

typedef std::vector<NewVertex> NewVertexList

typedef std::vector<Vec3d*> Vec3dList

Documentation

Originally a simple class for tessellating a single polygon boundary. Using old style glu tessellation functions for portability. Upgraded Jan 2004 to use the modern glu tessellation functions.

Tesselator()

~Tesselator()

enum WindingType

The winding rule, see red book ch 11.

TESS_WINDING_ODD

TESS_WINDING_NONZERO

TESS_WINDING_POSITIVE

TESS_WINDING_NEGATIVE

TESS_WINDING_ABS_GEQ_TWO

enum TesselationType

we interpret all contours in the geometry as a single set to be tesselated or each separate drawable's contours needs to be tesselated.

TESS_TYPE_GEOMETRY

TESS_TYPE_DRAWABLE

TESS_TYPE_POLYGONS

void setBoundaryOnly(const bool tt)

Set and get tesselation request boundary only on/off

inline const bool getBoundaryOnly( )

void setWindingType(const WindingType wt)

Set and get tesselation windong rule

inline const WindingType getWindingType( )

void setTesselationType(const TesselationType tt)

Set and get tesselation type

inline const TesselationType getTesselationType( )

void retesselatePolygons(osg::Geometry &cxgeom)

Change the contours lists of the geometry into tesselated primitives (the list of primitives in the original geometry is stored in the tesselator for possible re-use. The name remains retesselatePolygons although it now handles trifans, strips, quads etc. as well as Polygons so as to not break old codes relying on this function name.

osg::Geometry::PrimitiveSetList getContours()

typedef std::vector<osg::Vec3*> VertexPointList

struct Prim: public osg::Referenced

Prim(GLenum mode)

typedef std::vector<osg::Vec3*> VecList

GLenum _mode

VecList _vertices

void beginTesselation()

void beginContour()

void addVertex(osg::Vec3* vertex)

void endContour()

void endTesselation()

typedef std::vector< osg::ref_ptr<Prim> > PrimList

PrimList& getPrimList()

void reset()

void reduceArray(osg::Array* cold, const unsigned int nnu)

remove unused parts of the array, eg for wehn retesselating tesselation can introduce extra vertices for concave or crossing boundaries, these will leak memory if not removed when retesselating.

void collectTesselation(osg::Geometry &cxgeom)

typedef std::map<osg::Vec3*,unsigned int> VertexPtrToIndexMap

void addContour(osg::PrimitiveSet* primitive, osg::Vec3Array* vertices)

void handleNewVertices(osg::Geometry& geom, VertexPtrToIndexMap &vertexPtrToIndexMap)

void begin(GLenum mode)

void vertex(osg::Vec3* vertex)

void combine(osg::Vec3* vertex, void* vertex_data[4], GLfloat weight[4])

void end()

void error(GLenum errorCode)

static void CALLBACK beginCallback(GLenum which, void* userData)

static void CALLBACK vertexCallback(GLvoid* data, void* userData)

static void CALLBACK combineCallback(GLdouble coords[3], void* vertex_data[4], GLfloat weight[4], void** outData, void* useData)

static void CALLBACK endCallback(void* userData)

static void CALLBACK errorCallback(GLenum errorCode, void* userData)

struct Vec3d

double _v[3]

struct NewVertex

NewVertex()

NewVertex(const NewVertex& nv)

NewVertex(osg::Vec3* vx, float f1, osg::Vec3* v1, float f2, osg::Vec3* v2, float f3, osg::Vec3* v3, float f4, osg::Vec3* v4)

osg::Vec3* _vpos

float _f1

osg::Vec3* _v1

float _f2

osg::Vec3* _v2

float _f3

osg::Vec3* _v3

float _f4

osg::Vec3* _v4

typedef std::vector<NewVertex> NewVertexList

typedef std::vector<Vec3d*> Vec3dList

GLUtesselator* _tobj

PrimList _primList

Vec3dList _coordData

NewVertexList _newVertexList

GLenum _errorCode

WindingType _wtype

winding rule, which parts will become solid

TesselationType _ttype

tesselation rule, which parts will become solid

bool _boundaryOnly

unsigned int _numberVerts

number of vertices that are part of the 'original' set of contours

osg::Geometry::PrimitiveSetList _Contours

List of primitives that define the contours

unsigned int _index

count number of primitives in a geometry to get right no. of norms/colurs etc for per_primitive attributes.

This class has no child classes.

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