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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)

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.
   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.

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

   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.

   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.

Member Data Documentation

   SoSFInt32 SoIndexedNurbsSurface::numUControlPoints Number of control points
       in the U direction.
   SoSFInt32 SoIndexedNurbsSurface::numVControlPoints Number of control points
       in the V direction.
   SoMFInt32 SoIndexedNurbsSurface::coordIndex The coordinate control point
       indices.
   SoMFFloat SoIndexedNurbsSurface::uKnotVector The Bezier knot vector for the
       U direction.
   SoMFFloat SoIndexedNurbsSurface::vKnotVector The Bezier knot vector for the
       V direction.
   SoSFInt32 SoIndexedNurbsSurface::numSControlPoints Number of control points
       in the S direction.
   SoSFInt32 SoIndexedNurbsSurface::numTControlPoints Number of control points
       in the T direction.
   SoMFInt32 SoIndexedNurbsSurface::textureCoordIndex The texture coordinate
       control point indices.
   SoMFFloat SoIndexedNurbsSurface::sKnotVector The Bezier knot vector for the
       S direction.
   SoMFFloat SoIndexedNurbsSurface::tKnotVector The Bezier knot vector for the
       T direction.

Author

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