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SoFaceSet.3coin2

NAME

SoFaceSet -

The SoFaceSet class is used to render and organize non-indexed polygonal face data.

Faces are specified using the numVertices field. Coordinates, normals, materials and texture coordinates are fetched in order from the current state or from the vertexProperty node if set. For example, if numVertices is set to [3, 4, 5, 3], this node would specify a triangle from coordinates 0, 1 and 2, a quad from coordinates 3, 4, 5 and 6, a polygon from coordinates 7, 8, 9, 10 and 11 and finally a triangle from coordinates 12, 13, 14.

SYNOPSIS

#include <Inventor/nodes/SoFaceSet.h>

Inherits SoNonIndexedShape.

Public Member Functions

SoFaceSet (void)

virtual void GLRender (SoGLRenderAction *action)

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

virtual void getPrimitiveCount (SoGetPrimitiveCountAction *action)

Static Public Member Functions

static void initClass (void)

Public Attributes

SoMFInt32 numVertices

Protected Member Functions

virtual ~SoFaceSet ()

virtual void generatePrimitives (SoAction *action)

virtual void computeBBox (SoAction *action, SbBox3f &box, SbVec3f &center)

virtual SbBool generateDefaultNormals (SoState *, SoNormalCache *)

Detailed Description

The SoFaceSet class is used to render and organize non-indexed polygonal face data.

Faces are specified using the numVertices field. Coordinates, normals, materials and texture coordinates are fetched in order from the current state or from the vertexProperty node if set. For example, if numVertices is set to [3, 4, 5, 3], this node would specify a triangle from coordinates 0, 1 and 2, a quad from coordinates 3, 4, 5 and 6, a polygon from coordinates 7, 8, 9, 10 and 11 and finally a triangle from coordinates 12, 13, 14.

Binding PER_VERTEX, PER_FACE or OVERALL can be set for material, and normals. The default material binding is OVERALL. The default normal binding is PER_VERTEX.

For more elaborate documentation about face sets, see the class documentation of the SoIndexedFaceSet node, which contains examples and more detailed information about various issues also relevant for this node.

FILE FORMAT/DEFAULTS:

     FaceSet {
         vertexProperty NULL
         startIndex 0
         numVertices -1
     }
 
 

See also:

SoIndexedFaceSet, SoIndexedTriangleStripSet

Constructor & Destructor Documentation

SoFaceSet::SoFaceSet (void)Constructor.

References numVertices.

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

Member Function Documentation

static void sogl_nifs_m2_n2_t1 void SoFaceSet::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 SoNonIndexedShape.

void SoFaceSet::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 SoNonIndexedShape::fixNumVerticesPointers(), SoVertexShape::generateAndReadLockNormalCache(), SoMField::getNum(), SoAction::getState(), SoMFInt32::getValues(), SoVertexShape::getVertexData(), SoNode::GLRender(), numVertices, SoState::pop(), SoDebugError::postWarning(), SoState::push(), SoVertexShape::readUnlockNormalCache(), SoVertexShape::shouldGLRender(), SoNonIndexedShape::startIndex, and SoVertexShape::vertexProperty.

SbBool SoFaceSet::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.

void SoFaceSet::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(), SoNonIndexedShape::fixNumVerticesPointers(), SoMField::getNum(), SoAction::getState(), SoMFInt32::getValues(), numVertices, and SoShape::shouldPrimitiveCount().

void SoFaceSet::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(), SoNode::doAction(), SoShape::endShape(), SoNonIndexedShape::fixNumVerticesPointers(), SoVertexShape::generateAndReadLockNormalCache(), SoMField::getNum(), SoAction::getState(), SoMFInt32::getValues(), SoVertexShape::getVertexData(), SoFaceDetail::incFaceIndex(), numVertices, SoState::pop(), SoState::push(), SoVertexShape::readUnlockNormalCache(), SoPointDetail::setCoordinateIndex(), SoPrimitiveVertex::setDetail(), SoPrimitiveVertex::setMaterialIndex(), SoPointDetail::setMaterialIndex(), SoPrimitiveVertex::setNormal(), SoPointDetail::setNormalIndex(), SoPrimitiveVertex::setPoint(), SoPointDetail::setTextureCoordIndex(), SoPrimitiveVertex::setTextureCoords(), SoShape::shapeVertex(), SoNonIndexedShape::startIndex, and SoVertexShape::vertexProperty.

void SoFaceSet::computeBBox (SoAction * action, SbBox3f & box, SbVec3f & center) [protected, virtual]Implemented by SoShape subclasses to let the SoShape superclass know the exact size and weighted center point of the shape's bounding box.

The bounding box and center point should be calculated and returned in the local coordinate system.

The method implements action behavior for shape nodes for SoGetBoundingBoxAction. It is invoked from SoShape::getBoundingBox(). (Subclasses should not override SoNode::getBoundingBox().)

The box parameter sent in is guaranteed to be an empty box, while center is undefined upon function entry.

Implements SoShape.

References SoNonIndexedShape::computeCoordBBox(), SoMField::getNum(), and numVertices.

SbBool SoFaceSet::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 SoNonIndexedShape::fixNumVerticesPointers(), SoMField::getNum(), SoMFInt32::getValues(), numVertices, SoDebugError::postWarning(), and SoNonIndexedShape::startIndex.

Member Data Documentation

SoMFInt32 SoFaceSet::numVerticesUsed to specify faces. Each entry specifies the number of coordinates in a face. The coordinates are taken in order from the state or from the vertexProperty node.

Referenced by computeBBox(), generateDefaultNormals(), generatePrimitives(), getPrimitiveCount(), GLRender(), and SoFaceSet().

Author

Generated automatically by Doxygen for Coin from the source code.