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SoIndexedTriangleStripSet.3coin2

NAME

SoIndexedTriangleStripSet -

The SoIndexedTriangleStripSet class keeps data for rendering and otherwise representing triangle strips.

Use nodes of this type as an effective way of drawing triangles which are strung together.

SYNOPSIS

#include <Inventor/nodes/SoIndexedTriangleStripSet.h>

Inherits SoIndexedShape.

Public Member Functions

SoIndexedTriangleStripSet (void)

virtual void GLRender (SoGLRenderAction *action)

virtual void getPrimitiveCount (SoGetPrimitiveCountAction *action)

virtual SbBool generateDefaultNormals (SoState *state, SoNormalBundle *nb)

Static Public Member Functions

static void initClass (void)

Protected Member Functions

virtual ~SoIndexedTriangleStripSet ()

virtual SbBool generateDefaultNormals (SoState *state, SoNormalCache *nc)

virtual void generatePrimitives (SoAction *action)

Detailed Description

The SoIndexedTriangleStripSet class keeps data for rendering and otherwise representing triangle strips.

Use nodes of this type as an effective way of drawing triangles which are strung together.

For more information, see the documentation of the SoTriangleStripSet node.

To render several strips within the same node, just separate the coordinate indices with -1. For more information about indexed shapes, see documentation in SoIndexedShape and SoIndexedFaceSet.

Example scene graph:

 
   #Inventor V2.1 ascii
   
   Separator {
      Coordinate3 {
         point [
          -2 1 0, -1 -1 0, 0 1 0, 1 -1 0, 2 1 0, # first strip, z==0
          -2 1 5, -1 -1 5, 0 1 5, 1 -1 5, 2 1 5  # second strip, z==5
         ]
      }
   
      IndexedTriangleStripSet {
         coordIndex [
          0, 1, 2, 3, 4, -1,
          5, 6, 7, 8, 9, -1
         ]
      }
   }
   .fi
 
 
 FILE FORMAT/DEFAULTS: 
 
     IndexedTriangleStripSet {
         vertexProperty NULL
         coordIndex 0
         materialIndex -1
         normalIndex -1
         textureCoordIndex -1
     }
 
 

 

Constructor & Destructor Documentation

SoIndexedTriangleStripSet::SoIndexedTriangleStripSet (void)Constructor. Default field values will equal those set in the SoIndexedShape parent class.

SoIndexedTriangleStripSet::~SoIndexedTriangleStripSet () [protected, virtual]Destructor.

Member Function Documentation

void SoIndexedTriangleStripSet::initClass (void) [static]Sets up initialization for data common to all instances of this class, like submitting necessary information to the Coin type system.

Reimplemented from SoIndexedShape.

void SoIndexedTriangleStripSet::GLRender (SoGLRenderAction * action) [virtual]Action method for the SoGLRenderAction.

This is called during rendering traversals. Nodes influencing the rendering state in any way or who wants to throw geometry primitives at OpenGL overrides this method.

Reimplemented from SoShape.

References SoIndexedShape::coordIndex, SoMField::getNum(), SoAction::getState(), SoIndexedShape::getVertexData(), SoNode::GLRender(), SoState::pop(), SoState::push(), SoVertexShape::readUnlockNormalCache(), SoVertexShape::shouldGLRender(), and SoVertexShape::vertexProperty.

void SoIndexedTriangleStripSet::getPrimitiveCount (SoGetPrimitiveCountAction * action) [virtual]Action method for the SoGetPrimitiveCountAction.

Calculates the number of triangle, line segment and point primitives for the node and adds these to the counters of the action.

Nodes influencing how geometry nodes calculates their primitive count also overrides this method to change the relevant state variables.

Reimplemented from SoShape.

References SoGetPrimitiveCountAction::addNumTriangles(), SoGetPrimitiveCountAction::canApproximateCount(), SoIndexedShape::coordIndex, SoMField::getNum(), and SoShape::shouldPrimitiveCount().

SbBool SoIndexedTriangleStripSet::generateDefaultNormals (SoState * state, SoNormalBundle * bundle) [virtual]This API member is considered internal to the library, as it is not likely to be of interest to the application programmer.

Subclasses should override this method to generate default normals using the SoNormalBundle class. TRUE should be returned if normals were generated, FALSE otherwise.

Default method returns FALSE.

This function is an extension for Coin, and it is not available in the original SGI Open Inventor v2.1 API.

Reimplemented from SoVertexShape.

SbBool SoIndexedTriangleStripSet::generateDefaultNormals (SoState * state, SoNormalCache * cache) [protected, virtual]This API member is considered internal to the library, as it is not likely to be of interest to the application programmer.

Subclasses should override this method to generate default normals using the SoNormalCache class. This is more effective than using SoNormalGenerator. Return TRUE if normals were generated, FALSE otherwise.

Default method just returns FALSE.

This function is an extension for Coin, and it is not available in the original SGI Open Inventor v2.1 API.

Reimplemented from SoVertexShape.

References SoIndexedShape::coordIndex, SoFieldContainer::get(), SoNode::getClassTypeId(), SoMField::getNum(), SoMFInt32::getValues(), SoMFVec3f::getValues(), SoBase::isOfType(), SoVertexProperty::normal, SoVertexProperty::normalBinding, SoVertexProperty::vertex, and SoVertexShape::vertexProperty.

void SoIndexedTriangleStripSet::generatePrimitives (SoAction * action) [protected, virtual]The method implements action behavior for shape nodes for SoCallbackAction. It is invoked from SoShape::callback(). (Subclasses should not override SoNode::callback().)

The subclass implementations uses the convenience methods SoShape::beginShape(), SoShape::shapeVertex(), and SoShape::endShape(), with SoDetail instances, to pass the primitives making up the shape back to the caller.

Implements SoShape.

References SoShape::beginShape(), SoIndexedShape::coordIndex, SoNode::doAction(), SoShape::endShape(), SoMField::getNum(), SoAction::getState(), SoIndexedShape::getVertexData(), SoFaceDetail::incFaceIndex(), SoFaceDetail::incPartIndex(), SoState::pop(), SoState::push(), SoVertexShape::readUnlockNormalCache(), SoPointDetail::setCoordinateIndex(), SoPrimitiveVertex::setDetail(), SoFaceDetail::setFaceIndex(), SoPrimitiveVertex::setMaterialIndex(), SoPointDetail::setMaterialIndex(), SoPrimitiveVertex::setNormal(), SoPointDetail::setNormalIndex(), SoPrimitiveVertex::setPoint(), SoPointDetail::setTextureCoordIndex(), SoPrimitiveVertex::setTextureCoords(), SoShape::shapeVertex(), and SoVertexShape::vertexProperty.

Author

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