osg::DVRTriangle Class Reference

A triangle of a triangled clipping geometry object.

#include <OSGDVRTriangle.h>

List of all members.

Public Member Functions
	DVRTriangle (void)
	Constructor.
	DVRTriangle (const DVRTriangle &tri)
	Copy.
	~DVRTriangle (void)
	Destructor.
void	dump (void) const
	Usefull for debugging.
bool	setNumAddPerVertexAttr (UInt32 additionalPerVertexAttributes)
	set the number of additional per vertex attributes for the cutpoint
Public Attributes
Int32	neighbours [3]
	Indices of the neighbour triangles of this triangle.
Int32	vertices [3]
	Indices of the vertices of this triangle.
Vec3f	normal
	The triangles normal.
Vec3f	transformedNormal
	The triangles normal.
bool	visited
	A Flag. True, iff the triangle has been processed.
bool	inContour
	True if the triangle belongs to a contour.
DVRTriangle *	contourNeighbour
	the next triangle in the contour
Pnt3f	cutPnt
GLdouble *	cutPoint
bool	edgeCut [3]
	Indicates which edges are cut by the currently processed slice.

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Detailed Description

Definition at line 14 of file OSGDVRTriangle.h.

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Constructor & Destructor Documentation

DVRTriangle::DVRTriangle

(

void

)

Definition at line 8 of file OSGDVRTriangle.cpp.

References cutPnt, cutPoint, GLdouble, neighbours, and vertices.

{
    // at least we need the vertex position and a texture coordinate
    cutPoint = (GLdouble*) malloc(6 * sizeof(GLdouble));
  
    for(UInt32 i = 0; i < 3; i++)
    {
        vertices  [i] = -1;
        neighbours[i] = -1;
        cutPnt    [i] = 0.0f;
    }
}

DVRTriangle::DVRTriangle

(

const DVRTriangle &

tri

)

Definition at line 21 of file OSGDVRTriangle.cpp.

References cutPnt, cutPoint, GLdouble, neighbours, normal, and vertices.

{
  cutPoint = (GLdouble*) malloc(6 * sizeof(GLdouble));

  for(UInt32 i = 0; i < 3; i++)
  {
      vertices  [i] = tri.vertices  [i];
      neighbours[i] = tri.neighbours[i];
      cutPnt    [i] = 0.0f;
  }

  normal = tri.normal;
}

DVRTriangle::~DVRTriangle

(

void

)

Definition at line 35 of file OSGDVRTriangle.cpp.

References cutPoint.

{
    free(cutPoint); // allocation by malloc/realloc
}

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Member Function Documentation

void DVRTriangle::dump

(

void

)

const

Definition at line 49 of file OSGDVRTriangle.cpp.

References neighbours, and vertices.

{
    std::cerr <<"Verts: " 
              << vertices[0] << " " 
              << vertices[1] << " " 
              << vertices[2]
              <<" Neighbours: "
              << neighbours[0] << " " 
              << neighbours[1] << " " 
              << neighbours[2] << std::endl;
}

bool DVRTriangle::setNumAddPerVertexAttr

(

UInt32

additionalPerVertexAttributes

)

basically there are two attributes available, the vertex position and a 3D texture coordinate, if one needs additional attributes, e.g. color, texture coordinates,.., the number of (double) values needed has to be set with this function.

Definition at line 40 of file OSGDVRTriangle.cpp.

References cutPoint, and GLdouble.

{
    cutPoint = (GLdouble*) realloc(
        cutPoint,
        (6 + additionalPerVertexAttributes) * sizeof(GLdouble));

    return cutPoint != NULL;
}

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Member Data Documentation

Int32 osg::DVRTriangle::neighbours[3]

Definition at line 43 of file OSGDVRTriangle.h.

Referenced by dump(), DVRTriangle(), and osg::DVRClipGeometry::linkContour().

Int32 osg::DVRTriangle::vertices[3]

Definition at line 46 of file OSGDVRTriangle.h.

Referenced by osg::DVRClipGeometry::buildTriangledGeometry(), dump(), DVRTriangle(), osg::DVRClipGeometry::interpolate(), osg::DVRClipGeometry::isBehindPlane(), osg::DVRClipGeometry::isCut(), and osg::DVRClipGeometry::renderTriangle().

Vec3f osg::DVRTriangle::normal

Definition at line 49 of file OSGDVRTriangle.h.

Referenced by osg::DVRClipGeometry::buildTriangledGeometry(), and DVRTriangle().

Vec3f osg::DVRTriangle::transformedNormal

Definition at line 55 of file OSGDVRTriangle.h.

Referenced by osg::DVRClipGeometry::linkContour().

bool osg::DVRTriangle::visited

Definition at line 58 of file OSGDVRTriangle.h.

Referenced by osg::DVRClipGeometry::addNewActiveTriangles().

bool osg::DVRTriangle::inContour

Definition at line 61 of file OSGDVRTriangle.h.

Referenced by osg::DVRClipGeometry::addNewActiveTriangles(), osg::DVRClipGeometry::buildContours(), osg::DVRClipGeometry::linkContour(), and osg::DVRClipGeometry::updateActiveTriangles().

DVRTriangle* osg::DVRTriangle::contourNeighbour

Definition at line 64 of file OSGDVRTriangle.h.

Referenced by osg::DVRClipper::clipSlice(), osg::DVRClipGeometry::linkContour(), and osg::DVRClipGeometry::updateActiveTriangles().

Pnt3f osg::DVRTriangle::cutPnt

The intersection point of the triangle and the current slice that contributes to the contour

Definition at line 68 of file OSGDVRTriangle.h.

Referenced by osg::DVRClipGeometry::buildTriangledGeometry(), DVRTriangle(), and osg::DVRClipGeometry::linkContour().

GLdouble* osg::DVRTriangle::cutPoint

The intersection point of the triangle and the current slice that contributes to the contour with additional texture coordinates, needed because GLUTesselator needs an opaque pointer. The first three values represent the vertex position, the next three the (always available) first texture coordinate for this point and the following values the additional per vertex attributes (if any)

Definition at line 77 of file OSGDVRTriangle.h.

Referenced by osg::DVRClipGeometry::buildTriangledGeometry(), osg::DVRClipper::clipSlice(), DVRTriangle(), osg::DVRClipGeometry::linkContour(), setNumAddPerVertexAttr(), and ~DVRTriangle().

bool osg::DVRTriangle::edgeCut[3]

Definition at line 80 of file OSGDVRTriangle.h.

Referenced by osg::DVRClipGeometry::isCut(), and osg::DVRClipGeometry::linkContour().

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

• OSGDVRTriangle.h
• OSGDVRTriangle.cpp