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SoIndexedNurbsSurface.3coin2

Langue: en

Version: 380965 (fedora - 01/12/10)

Section: 3 (Bibliothèques de fonctions)

Sommaire

NAME
SYNOPSIS
Detailed Description
Constructor & Destructor Documentation
- SoIndexedNurbsSurface::SoIndexedNurbsSurface (void)Constructor.
- SoIndexedNurbsSurface::~SoIndexedNurbsSurface () [protected, virtual]Destructor.
Member Function Documentation
Member Data Documentation
Author

NAME

SoIndexedNurbsSurface -

The SoIndexedNurbsSurface class can be used to render NURBS surfaces.

It is very similar to the SoNurbsSurface class, but controlpoints can be specified using indices.

SYNOPSIS

#include <Inventor/nodes/SoIndexedNurbsSurface.h>

Inherits SoShape.

Public Member Functions

SoIndexedNurbsSurface (void)

virtual void GLRender (SoGLRenderAction *action)

virtual void rayPick (SoRayPickAction *action)

virtual void getPrimitiveCount (SoGetPrimitiveCountAction *action)

void sendPrimitive (SoAction *, SoPrimitiveVertex *)

Static Public Member Functions

static void initClass (void)

Public Attributes

SoSFInt32 numUControlPoints

SoSFInt32 numVControlPoints

SoMFInt32 coordIndex

SoMFFloat uKnotVector

SoMFFloat vKnotVector

SoSFInt32 numSControlPoints

SoSFInt32 numTControlPoints

SoMFInt32 textureCoordIndex

SoMFFloat sKnotVector

SoMFFloat tKnotVector

Protected Member Functions

virtual ~SoIndexedNurbsSurface ()

virtual void generatePrimitives (SoAction *action)

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

SoDetail * createTriangleDetail (SoRayPickAction *action, const SoPrimitiveVertex *v1, const SoPrimitiveVertex *v2, const SoPrimitiveVertex *v3, SoPickedPoint *pp)

Friends

class SoIndexedNurbsSurfaceP

Detailed Description

The SoIndexedNurbsSurface class can be used to render NURBS surfaces.

It is very similar to the SoNurbsSurface class, but controlpoints can be specified using indices.

FILE FORMAT/DEFAULTS:

     IndexedNurbsSurface {
         numUControlPoints 0
         numVControlPoints 0
         coordIndex 0
         uKnotVector 0
         vKnotVector 0
         numSControlPoints 0
         numTControlPoints 0
         textureCoordIndex -1
         sKnotVector 0
         tKnotVector 0
     }

Constructor & Destructor Documentation

SoIndexedNurbsSurface::SoIndexedNurbsSurface (void)Constructor.

References coordIndex, numSControlPoints, numTControlPoints, numUControlPoints, numVControlPoints, sKnotVector, textureCoordIndex, tKnotVector, uKnotVector, and vKnotVector.

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

Member Function Documentation

void SoIndexedNurbsSurface::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 SoShape.

void SoIndexedNurbsSurface::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 SoAction::getState(), and SoShape::shouldGLRender().

void SoIndexedNurbsSurface::rayPick (SoRayPickAction * action) [virtual]Calculates picked point based on primitives generated by subclasses.

Reimplemented from SoShape.

References SoAction::getState(), SoState::pop(), SoDebugError::postWarning(), SoState::push(), SoFieldContainer::set(), and SoShape::shouldRayPick().

void SoIndexedNurbsSurface::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.

void SoIndexedNurbsSurface::sendPrimitive (SoAction , SoPrimitiveVertex )This method is part of the original SGI Inventor API, but not implemented in Coin, as it looks like a method that should probably have been private in Open Inventor.

void SoIndexedNurbsSurface::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.

void SoIndexedNurbsSurface::computeBBox (SoAction * action, SbBox3f & box, SbVec3f & center) [protected, virtual]Calculates the bounding box of all control points and sets the center to the average of these points.

Implements SoShape.

References coordIndex, SbBox3f::extendBy(), SoMField::getNum(), SbVec4f::getReal(), SoAction::getState(), SoMFInt32::getValues(), and SbBox3f::makeEmpty().

SoDetail * SoIndexedNurbsSurface::createTriangleDetail (SoRayPickAction * action, const SoPrimitiveVertex * v1, const SoPrimitiveVertex * v2, const SoPrimitiveVertex * v3, SoPickedPoint * pp) [protected, virtual]Will create triangle detail for a SoPickedPoint. This method will only be called internally, when generatePrimitives() is used for picking (SoShape::rayPick() is not overridden).

This method returns NULL in Open Inventor, and subclasses will need to override this method to create details for a SoPickedPoint.

This is not necessary with Coin. Of course, if you choose to override it, it will work in the same way as Open Inventor.

For this to work, you must supply a face or line detail when generating primitives. If you supply NULL for the detail argument in SoShape::beginShape(), you'll have to override this method.

Reimplemented from SoShape.