SoFaceSet (3)

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

virtual SoType getTypeId (void) const

Returns the type identification of an object derived from a class inheriting SoBase. This is used for run-time type checking and 'downward' casting. SoFaceSet (void)

virtual void GLRender (SoGLRenderAction *action)

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

virtual void getPrimitiveCount (SoGetPrimitiveCountAction *action)

Static Public Member Functions

static SoType getClassTypeId (void)

static void initClass (void)

Public Attributes

SoMFInt32 numVertices

Protected Member Functions

virtual const SoFieldData * getFieldData (void) const

virtual ~SoFaceSet ()

virtual void generatePrimitives (SoAction *action)

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

virtual SbBool generateDefaultNormals (SoState *, SoNormalCache *)

Static Protected Member Functions

static const SoFieldData ** getFieldDataPtr (void)

Additional Inherited Members

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.

SoFaceSet::~SoFaceSet ()\fC [protected]\fP, \fC [virtual]\fP

Destructor.

Member Function Documentation

\fBSoType\fP SoFaceSet::getTypeId (void) const\fC [virtual]\fP

Returns the type identification of an object derived from a class inheriting SoBase. This is used for run-time type checking and 'downward' casting. Usage example:

void foo(SoNode * node)
{
  if (node->getTypeId() == SoFile::getClassTypeId()) {
    SoFile * filenode = (SoFile *)node;  // safe downward cast, knows the type
  }
}

For application programmers wanting to extend the library with new nodes, engines, nodekits, draggers or others: this method needs to be overridden in all subclasses. This is typically done as part of setting up the full type system for extension classes, which is usually accomplished by using the pre-defined macros available through for instance Inventor/nodes/SoSubNode.h (SO_NODE_INIT_CLASS and SO_NODE_CONSTRUCTOR for node classes), Inventor/engines/SoSubEngine.h (for engine classes) and so on.

For more information on writing Coin extensions, see the class documentation of the toplevel superclasses for the various class groups.

Reimplemented from SoNonIndexedShape.

const \fBSoFieldData\fP * SoFaceSet::getFieldData (void) const\fC [protected]\fP, \fC [virtual]\fP

Returns a pointer to the class-wide field data storage object for this instance. If no fields are present, returns NULL.

Reimplemented from SoNonIndexedShape.

void SoFaceSet::GLRender (\fBSoGLRenderAction\fP *action)\fC [virtual]\fP

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.

SbBool SoFaceSet::generateDefaultNormals (\fBSoState\fP state, \fBSoNormalBundle\fP bundle)\fC [virtual]\fP

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 (\fBSoGetPrimitiveCountAction\fP *action)\fC [virtual]\fP

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.

void SoFaceSet::generatePrimitives (\fBSoAction\fP *action)\fC [protected]\fP, \fC [virtual]\fP

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.

void SoFaceSet::computeBBox (\fBSoAction\fP *action, \fBSbBox3f\fP &box, \fBSbVec3f\fP ¢er)\fC [protected]\fP, \fC [virtual]\fP

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.