SoNormalGenerator.h

#ifndef COIN_SONORMALGENERATOR_H
#define COIN_SONORMALGENERATOR_H

/**************************************************************************\
 * Copyright (c) Kongsberg Oil & Gas Technologies AS
 * All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
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 * Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 * 
 * Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 * 
 * Neither the name of the copyright holder nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 * 
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\**************************************************************************/

#include <Inventor/SbVec3f.h>
#include <Inventor/SbBSPTree.h>
#include <Inventor/lists/SbList.h>
#include <Inventor/system/inttypes.h>

class COIN_DLL_API SoNormalGenerator {
public:
  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);

  // call these only after generate
  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);

private:
  SbBSPTree bsp;
  SbList <int> vertexList;
  SbList <int> vertexFace;
  SbList <SbVec3f> faceNormals;
  SbList <SbVec3f> vertexNormals;

  SbBool ccw;
  SbBool perVertex;
  int currFaceStart;

  SbVec3f calcFaceNormal();
};

#endif // !COIN_SONORMALGENERATOR_H