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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