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SoNurbsSurface.3coin2
Langue: en
Version: 380925 (fedora - 01/12/10)
Section: 3 (Bibliothèques de fonctions)
Sommaire
- NAME
- SYNOPSIS
- Detailed Description
- Constructor & Destructor Documentation
- Member Function Documentation
- void SoNurbsSurface::initClass (void) [static]Sets up initialization for data common to all instances of this class, like submitting necessary information to the Coin type system.
- void SoNurbsSurface::GLRender (SoGLRenderAction * action) [virtual]Action method for the SoGLRenderAction.
- void SoNurbsSurface::rayPick (SoRayPickAction * action) [virtual]Calculates picked point based on primitives generated by subclasses.
- void SoNurbsSurface::getPrimitiveCount (SoGetPrimitiveCountAction * action) [virtual]Action method for the SoGetPrimitiveCountAction.
- void SoNurbsSurface::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 SoNurbsSurface::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().)
- void SoNurbsSurface::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.
- SoDetail * SoNurbsSurface::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).
- Member Data Documentation
- SoSFInt32 SoNurbsSurface::numUControlPointsNumber of control points in the U direction.
- SoSFInt32 SoNurbsSurface::numVControlPointsNumber of control points in the V direction.
- SoSFInt32 SoNurbsSurface::numSControlPointsNumber of control points in the S direction.
- SoSFInt32 SoNurbsSurface::numTControlPointsNumber of control points in the T direction.
- SoMFFloat SoNurbsSurface::uKnotVectorThe Bezier knot vector for the U direction.
- SoMFFloat SoNurbsSurface::vKnotVectorThe Bezier knot vector for the V direction.
- SoMFFloat SoNurbsSurface::sKnotVectorThe Bezier knot vector for the S direction.
- SoMFFloat SoNurbsSurface::tKnotVectorThe Bezier knot vector for the T direction.
- Author
NAME
SoNurbsSurface -The SoNurbsSurface class is used to render smooth surfaces.
A general explanation of NURBS is beyond the scope of the Coin documentation. For detailed information, refer to the specialized literature on the topic (for example 'An Introduction to NURBS: With
Historical Perspective' by David F. Rogers). A basic overview of curve and surface rendering using NURBS can be found in chapter 8 of 'The Inventor Mentor'.
SYNOPSIS
#include <Inventor/nodes/SoNurbsSurface.h>
Inherits SoShape.
Public Member Functions
SoNurbsSurface (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
SoSFInt32 numSControlPoints
SoSFInt32 numTControlPoints
SoMFFloat uKnotVector
SoMFFloat vKnotVector
SoMFFloat sKnotVector
SoMFFloat tKnotVector
Protected Member Functions
virtual ~SoNurbsSurface ()
virtual void generatePrimitives (SoAction *action)
virtual void computeBBox (SoAction *action, SbBox3f &box, SbVec3f ¢er)
SoDetail * createTriangleDetail (SoRayPickAction *action, const SoPrimitiveVertex *v1, const SoPrimitiveVertex *v2, const SoPrimitiveVertex *v3, SoPickedPoint *pp)
Friends
class SoNurbsSurfaceP
Detailed Description
The SoNurbsSurface class is used to render smooth surfaces.
A general explanation of NURBS is beyond the scope of the Coin documentation. For detailed information, refer to the specialized literature on the topic (for example 'An Introduction to NURBS: With
Historical Perspective' by David F. Rogers). A basic overview of curve and surface rendering using NURBS can be found in chapter 8 of 'The Inventor Mentor'.
Note that knot values should be specified as [0, 1, 2,..., a] rather than [0, 1/a, 2/a,..., 1] to avoid tesselation errors due to floating point precision problems. (Even if the rendered surface looks correct, such issues might surface when e.g. doing picking, since the tesselated representation used internally is not the same as the one you see rendered by OpenGL on-screen.)
A basic usage example:
#Inventor V2.1 ascii ShapeHints { vertexOrdering COUNTERCLOCKWISE } Coordinate3 { point [ -3 -3 -3, -3 -1 -3, -3 1 -3, -3 3 -3, -1 -3 -3, -1 -1 3, -1 1 3, -1 3 -3, 1 -3 -3, 1 -1 3, 1 1 3, 1 3 -3, 3 -3 -3, 3 -1 -3, 3 1 -3, 3 3 -3 ] } NurbsSurface { numUControlPoints 4 numVControlPoints 4 uKnotVector [ 0.0, 0.0, 0.0, 0.0, 1.0, 1.0, 1.0, 1.0 ] vKnotVector [ 0.0, 0.0, 0.0, 0.0, 1.0, 1.0, 1.0, 1.0 ] }
FILE FORMAT/DEFAULTS:
NurbsSurface { numUControlPoints 0 numVControlPoints 0 numSControlPoints 0 numTControlPoints 0 uKnotVector 0 vKnotVector 0 sKnotVector 0 tKnotVector 0 }
Constructor & Destructor Documentation
SoNurbsSurface::SoNurbsSurface (void)Constructor.
References numSControlPoints, numTControlPoints, numUControlPoints, numVControlPoints, sKnotVector, tKnotVector, uKnotVector, and vKnotVector.
SoNurbsSurface::~SoNurbsSurface () [protected, virtual]Destructor.
Member Function Documentation
void SoNurbsSurface::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 SoNurbsSurface::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 SoNurbsSurface::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 SoNurbsSurface::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 SoNurbsSurface::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 SoNurbsSurface::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 SoNurbsSurface::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 SbBox3f::extendBy(), SoAction::getState(), SbBox3f::makeEmpty(), numUControlPoints, and numVControlPoints.
SoDetail * SoNurbsSurface::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 SoNurbsSurface::numUControlPointsNumber of control points in the U direction.
Referenced by computeBBox(), and SoNurbsSurface().
SoSFInt32 SoNurbsSurface::numVControlPointsNumber of control points in the V direction.
Referenced by computeBBox(), and SoNurbsSurface().
SoSFInt32 SoNurbsSurface::numSControlPointsNumber of control points in the S direction.
Referenced by SoNurbsSurface().
SoSFInt32 SoNurbsSurface::numTControlPointsNumber of control points in the T direction.
Referenced by SoNurbsSurface().
SoMFFloat SoNurbsSurface::uKnotVectorThe Bezier knot vector for the U direction.
Referenced by SoNurbsSurface().
SoMFFloat SoNurbsSurface::vKnotVectorThe Bezier knot vector for the V direction.
Referenced by SoNurbsSurface().
SoMFFloat SoNurbsSurface::sKnotVectorThe Bezier knot vector for the S direction.
Referenced by SoNurbsSurface().
SoMFFloat SoNurbsSurface::tKnotVectorThe Bezier knot vector for the T direction.
Referenced by SoNurbsSurface().
Author
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