NAME

       SoNormalGenerator -

       The SoNormalGenerator class is used to generate normals.

       FIXME: document properly.

SYNOPSIS

       #include <include/Inventor/misc/SoNormalGenerator.h>

   Public Member Functions
       SoNormalGenerator (const SbBool ccw, const int approxVertices=64)
       ~SoNormalGenerator ()
       void reset (const SbBool ccw)
       void beginPolygon ()
       void polygonVertex (const SbVec3f &v)
       void endPolygon ()
       void triangle (const SbVec3f &v0, const SbVec3f &v1, const SbVec3f &v2)
       void quad (const SbVec3f &v0, const SbVec3f &v1, const SbVec3f &v2, const SbVec3f &v3)
       void generate (const float creaseAngle, const int32_t *striplens=NULL, const int
           numstrips=0)
       void generatePerStrip (const int32_t *striplens, const int numstrips)
       void generatePerFace (void)
       void generateOverall (void)
       int getNumNormals () const
       void setNumNormals (const int num)
       const SbVec3f * getNormals () const
       const SbVec3f & getNormal (const int32_t i) const
       void setNormal (const int32_t index, const SbVec3f &normal)

Detailed Description

       The SoNormalGenerator class is used to generate normals.

       FIXME: document properly.

Constructor & Destructor Documentation

   SoNormalGenerator::SoNormalGenerator (const SbBoolisccw, const intapproxVertices = 64)
       Constructor with isccw indicating if polygons are specified in counter clockwise order.
       The approxVertices can be used to optimize normal generation.

   SoNormalGenerator::~SoNormalGenerator ()
       Destructor.

Member Function Documentation

   void SoNormalGenerator::reset (const SbBoolccwarg)
       Resets the normal generator, making it possible to reuse it without allocating a new one.

       This function is an extension for Coin, and it is not available in the original SGI Open
       Inventor v2.1 API.

       Since:
           Coin 2.0

   void SoNormalGenerator::beginPolygon (void)
       Signals the start of a new polygon.

       See Also:
           SoNormalGenerator::polygonVertex()

           SoNormalGenerator::endPolygon()

   void SoNormalGenerator::polygonVertex (const SbVec3f &v)
       Adds a vertex to the current polygon.

       See Also:
           SoNormalGenerator::beginPolygon()

           SoNormalGenerator::endPolygon()

   void SoNormalGenerator::endPolygon (void)
       Signals the end of a polygon.

       See Also:
           SoNormalGenerator::beginPolygon()

           SoNormalGenerator::polygonVertex()

   void SoNormalGenerator::triangle (const SbVec3f &v0, const SbVec3f &v1, const SbVec3f &v2)
       Convenience method for adding a triangle.

   void SoNormalGenerator::quad (const SbVec3f &v0, const SbVec3f &v1, const SbVec3f &v2, const
       SbVec3f &v3)
       Convenience method for adding a quad

   void SoNormalGenerator::generate (const floatcreaseAngle, const int32_t *striplens = NULL,
       const intnumstrips = 0)
       Triggers the normal generation. Normals are generated using creaseAngle to find which
       edges should be flat-shaded and which should be smooth-shaded.

       If normals are generated for triangle strips, the striplens and numstrips must be
       supplied. See src/nodes/SoTriangleStripSet.cpp (generateDefaultNormals()) for an example
       on how you send triangle strip information to this generator. It's not trivial, since you
       have to know how OpenGL/Coin generate triangles from triangle strips.

   void SoNormalGenerator::generatePerStrip (const int32_t *striplens, const intnumstrips)
       Generates one normal per strip by averaging face normals.

   void SoNormalGenerator::generatePerFace (void)
       Generates the normals per face. Use this when PER_FACE normal binding is needed. This
       method is not part of the OIV API.

   void SoNormalGenerator::generateOverall (void)
       Generates one overall normal by averaging all face normals. Use when normal binding is
       OVERALL. This method is not part of the OIV API.

   int SoNormalGenerator::getNumNormals (void) const
       Returns the number of normals generated.

   void SoNormalGenerator::setNumNormals (const intnum)
       Sets the number of generated normals. This method is not supported in Coin, and is
       provided for API compatibility only.

   const SbVec3f * SoNormalGenerator::getNormals (void) const
       Returns a pointer to the generated normals.

   const SbVec3f & SoNormalGenerator::getNormal (const int32_ti) const
       Returns the normal at index i.

       See Also:
           SoNormalGenerator::getNumNormals()

   void SoNormalGenerator::setNormal (const int32_tindex, const SbVec3f &normal)
       Sets the normal at index index to normal. This method is not supported in Coin, and is
       provided for API compatibility only.

Author

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