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SoPointSet.3coin2

NAME

SoPointSet -

The SoPointSet class is used to display a set of 3D points.

This node either uses the coordinates currently on the state (typically set up by a leading SoCoordinate3 node in the scenegraph) or from a SoVertexProperty node attached to this node to render a set of 3D points.

SYNOPSIS

#include <Inventor/nodes/SoPointSet.h>

Inherits SoNonIndexedShape.

Inherited by SoMarkerSet.

Public Member Functions

SoPointSet (void)

virtual void GLRender (SoGLRenderAction *action)

virtual void getBoundingBox (SoGetBoundingBoxAction *action)

virtual void getPrimitiveCount (SoGetPrimitiveCountAction *action)

Static Public Member Functions

static void initClass (void)

Public Attributes

SoSFInt32 numPoints

Protected Member Functions

virtual ~SoPointSet ()

virtual void generatePrimitives (SoAction *action)

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

virtual SbBool generateDefaultNormals (SoState *, SoNormalCache *nc)

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

Detailed Description

The SoPointSet class is used to display a set of 3D points.

This node either uses the coordinates currently on the state (typically set up by a leading SoCoordinate3 node in the scenegraph) or from a SoVertexProperty node attached to this node to render a set of 3D points.

The SoPointSet::numPoints field specifies the number of points in the coordinate set which should be rendered (or otherwise handled by traversal actions).

Here's a simple usage example of SoPointSet in a scenegraph:

 
   #Inventor V2.1 ascii
 
   Separator {
      Material {
         diffuseColor [
          1 0 0, 0 1 0, 0 0 1, 1 1 0, 1 0 1, 1 1 1, 1 0.8 0.6, 0.6 0.8 1
         ]
      }
      MaterialBinding { value PER_PART }
 
      Coordinate3 {
         point [
          -1 1 0, -1 -1 0, 1 -1 0, 1 1 0, 0 2 -1, -2 0 -1, 0 -2 -1, 2 0 -1
         ]
      }
 
      DrawStyle { pointSize 3 }
 
      PointSet { }
   }
   .fi
 
 
 FILE FORMAT/DEFAULTS: 
 
     PointSet {
         vertexProperty NULL
         startIndex 0
         numPoints -1
     }
 
 

 

Constructor & Destructor Documentation

SoPointSet::SoPointSet (void)Constructor.

References numPoints.

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

Member Function Documentation

void SoPointSet::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.

Reimplemented in SoMarkerSet.

References SoNode::VRML1.

void SoPointSet::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.

Reimplemented in SoMarkerSet.

References SoShape::finishVertexArray(), SoGLRenderAction::getCacheContext(), SoAction::getState(), SoVertexShape::getVertexData(), SoNode::GLRender(), numPoints, SoState::pop(), SoState::push(), SoVertexShape::shouldGLRender(), SoNonIndexedShape::startIndex, SoShape::startVertexArray(), and SoVertexShape::vertexProperty.

void SoPointSet::getBoundingBox (SoGetBoundingBoxAction * action) [virtual]Action method for the SoGetBoundingBoxAction.

Calculates bounding box and center coordinates for node and modifies the values of the action to encompass the bounding box for this node and to shift the center point for the scene more towards the one for this node.

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

Reimplemented from SoShape.

References SoShape::getBoundingBox().

void SoPointSet::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.

Reimplemented in SoMarkerSet.

References SoGetPrimitiveCountAction::addNumPoints(), SoNode::getClassTypeId(), SoMField::getNum(), SoAction::getState(), SoBase::isOfType(), numPoints, SoShape::shouldPrimitiveCount(), SoNonIndexedShape::startIndex, SoVertexProperty::vertex, and SoVertexShape::vertexProperty.

void SoPointSet::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(), SoAction::getState(), SoVertexShape::getVertexData(), numPoints, SoState::pop(), SoState::push(), 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 SoPointSet::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(), and numPoints.

SbBool SoPointSet::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.

SbBool SoPointSet::generateDefaultNormals (SoState * state, SoNormalBundle * bundle) [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 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.

Member Data Documentation

SoSFInt32 SoPointSet::numPointsUsed to specify number of points in the point set. Coordinates for the points will be taken from the state stack's set of 3D coordinates, typically set up by a leading SoCoordinate3 node.

If this field is equal to -1 (the default value) all coordinates currently on the state will be rendered or otherwise handled by traversal actions.

SoPointSet inherits the field SoNonIndexedShape::startIndex, which specifies the start index for points from the current state set of coordinates. Please note that this field has been obsoleted, but is still provided for compatibility.

Referenced by computeBBox(), generatePrimitives(), getPrimitiveCount(), SoMarkerSet::getPrimitiveCount(), GLRender(), SoMarkerSet::GLRender(), and SoPointSet().

Author

Generated automatically by Doxygen for Coin from the source code.