SoIndexedNurbsSurface(3) The SoIndexedNurbsSurface class can be used to render NURBS surfaces.


#include <Inventor/nodes/SoIndexedNurbsSurface.h>

Inherits SoShape.

Public Member Functions

virtual SoType getTypeId (void) const

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 SoType getClassTypeId (void)

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 const SoFieldData * getFieldData (void) const

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)

Static Protected Member Functions

static const SoFieldData ** getFieldDataPtr (void)

Additional Inherited Members

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.


    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)


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


Member Function Documentation

SoType SoIndexedNurbsSurface::getClassTypeId (void) [static]

This static method returns the SoType object associated with objects of this class.

Reimplemented from SoShape.

SoType SoIndexedNurbsSurface::getTypeId (void) const [virtual]

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 SoShape.

const SoFieldData ** SoIndexedNurbsSurface::getFieldDataPtr (void) [static], [protected]

This API member is considered internal to the library, as it is not likely to be of interest to the application programmer.

Reimplemented from SoShape.

const SoFieldData * SoIndexedNurbsSurface::getFieldData (void) const [protected], [virtual]

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

Reimplemented from SoShape.

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.


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