SoIndexedNurbsCurve(3)

NAME
SoIndexedNurbsCurve - The SoIndexedNurbsCurve class is a node for representing smooth curves.

Explaining NURBS is beyond the scope of this documentation. If you are unfamiliar with the principles of representing smooth curves and surfaces when doing 3D visualization, we recommend finding a good book on the subject.

SYNOPSIS

#include <Inventor/nodes/SoIndexedNurbsCurve.h>

Inherits SoShape.

  Public Member Functions
virtual SoType getTypeId (void) const
SoIndexedNurbsCurve (void)
virtual void GLRender (SoGLRenderAction *action)
virtual void rayPick (SoRayPickAction *action)
virtual void getPrimitiveCount (SoGetPrimitiveCountAction *action)
virtual void getBoundingBox (SoGetBoundingBoxAction *action)
void sendPrimitive (SoAction *, SoPrimitiveVertex *)

  Static Public Member Functions
static SoType getClassTypeId (void)
static void initClass (void)

  Public Attributes
SoSFInt32 numControlPoints
SoMFInt32 coordIndex
SoMFFloat knotVector

  Protected Member Functions
virtual const SoFieldData * getFieldData (void) const
virtual ~SoIndexedNurbsCurve ()
virtual void generatePrimitives (SoAction *action)
virtual void computeBBox (SoAction *action, SbBox3f &box, SbVec3f &center)
virtual SoDetail * createLineSegmentDetail (SoRayPickAction *action, const SoPrimitiveVertex *v1, const SoPrimitiveVertex *v2, SoPickedPoint *pp)

  Static Protected Member Functions
static const SoFieldData ** getFieldDataPtr (void)

  Additional Inherited Members

Detailed Description

The SoIndexedNurbsCurve class is a node for representing smooth curves.

Explaining NURBS is beyond the scope of this documentation. If you are unfamiliar with the principles of representing smooth curves and surfaces when doing 3D visualization, we recommend finding a good book on the subject. FILE FORMAT/DEFAULTS:

IndexedNurbsCurve {
    numControlPoints 0
    coordIndex 0
    knotVector 0
}

Constructor & Destructor Documentation

  SoIndexedNurbsCurve::SoIndexedNurbsCurve (void)
Constructor.

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

Member Function Documentation

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

Reimplemented from SoShape.

  void SoIndexedNurbsCurve::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 SoIndexedNurbsCurve::getBoundingBox (SoGetBoundingBoxAction * action) [virtual]
Redefined to notify open caches that this shape contains lines.

Reimplemented from SoShape.

  void SoIndexedNurbsCurve::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 SoIndexedNurbsCurve::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 SoIndexedNurbsCurve::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 * SoIndexedNurbsCurve::createLineSegmentDetail (SoRayPickAction * action, const SoPrimitiveVertex * v1, const SoPrimitiveVertex * v2, SoPickedPoint * pp) [protected], [virtual]
Will create line 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 SoIndexedNurbsCurve::numControlPoints
Number of control points for this curve.

  SoMFInt32 SoIndexedNurbsCurve::coordIndex
The control point indices. Supply at least numControlPoint indices.

  SoMFFloat SoIndexedNurbsCurve::knotVector
The knot vector.

Author

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