Inventor/misc/SoNormalGenerator.h

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/*=======================================================================
 * Copyright 1991-1996, Silicon Graphics, Inc.
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/*=======================================================================
** Author      : Thad Beier (MMM yyyy)
** Modified by : Paul S. Strauss (MMM yyyy)
**=======================================================================*/
/*=======================================================================
 *** THE CONTENT OF THIS WORK IS PROPRIETARY TO FEI S.A.S, (FEI S.A.S.),            ***
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**=======================================================================*/
/*=======================================================================
** Modified by : VSG (MMM YYYY)
**=======================================================================*/



#ifndef  _SO_NORMAL_GENERATOR_
#define  _SO_NORMAL_GENERATOR_

#include <Inventor/SbLinear.h>
#include <Inventor/elements/SoNeighborToleranceElement.h>


#include <Inventor/STL/vector>
#include <Inventor/STL/utility>

{

 public:

   SoNormalGenerator(
     const SbBool isCCW,
     const int approxNumVertices=16,
     const int approxNumFaces=6,
     const float creaseAngle =0.0f,
     const float toleranceFactor = SoNeighborToleranceElement::getDefault()
     );

   ~SoNormalGenerator();

   void setupApproxShapeSize(const int32_t approxNumVertices,const int32_t approxNumFaces);

   void beginPolygon();
   void polygonVertex(const SbVec3f &point);
   void endPolygon();

   void triangle(const SbVec3f &p1,const SbVec3f &p2,const SbVec3f &p3);

   void setupIndexedVertexArray(const SbVec3f* pointArray);

   void setupIndexedConnectivity(const int32_t* connectivityArray);

   void polygonVertex(const int32_t pointIndex);

   void triangle(const int32_t index1,const int32_t index2,const int32_t index3);

   void generate();

   int getNumNormals() const   { return numVertNormals; }

   void setNumNormals(int newNum);

   const SbVec3f *getNormals() const
  { return vertNormals; }

   const SbVec3f & getNormal(int32_t i) const
  { return vertNormals[i]; }

   void setNormal(int32_t index, const SbVec3f &newNormal);

   int32_t numNormalCrack() const
  {return m_numNormalCrack; };

private:
  /*
   * Some shapes may need to adjust or reorder all normals after
   * generation. This method can be used to change all normal in one 
   * shot without any copy. 
   */
   void setNormalBuffer(int32_t numNormals, const SbVec3f *normals);

   bool isIndexedMode() const
  {return m_isIndexedMode; }

private: 
  void endPolygon_( int32_t numVertices );

  inline void addPolygonNormal( const SbVec3f &vec1, const SbVec3f &vec2 )
  {  polygonSum += (vec1).cross(vec2); }

 private:
  // Arrays of vertex points, face normals, and vertex normals. The
  // face normals are stored one per vertex. The other vars are the
  // number of items in the arrays, and the allocated sizes of the
  // arrays. Since the points and faceNormals arrays are always the
  // same size, no need for extra variables.
  // Depending on setupIndexedVertexArray call or not, data are used 
  // from points or pointsIndex array.
  SbVec3f             *points, *faceNormals, *vertNormals;
  int32_t             *pointIndexes;
  int32_t             numPoints, numVertNormals;
  int32_t             maxPoints, maxFaceNormals, maxVertNormals;
  SbVec3f             polygonSum;

  // Flag: if TRUE, polygons are oriented counter-clockwise
  SbBool              m_isCCW;
  float               m_creaseAngle;
  float               m_toleranceFactor;

  int32_t             m_approxNumVertices;
  int32_t             m_approxNumFaces;
  int32_t             m_faceIndex;
  int32_t             m_pointIndex;

  // Index into points array where current polygon started
  int32_t             beginPolygonIndex;
  SbBox3f               m_bbox;

  // 
  int                 m_numNormalCrack;
  bool                m_isIndexedMode;
  int32_t             *m_userConnectivity;

  // grow point or pointsIndexes array depending on current number of point.
  void growPointsArray(const int requestedMaxPoints);
  // grow current facenormals array .
  void growNormalFaceArray(const int requestedNormalFaceArraySize);


  inline bool needToComputeConnectivity( ) const
  { return (( m_creaseAngle != 0.0f ) && ( m_userConnectivity == NULL )); }

  // compute a double link list of points that are connected.
  // the resulting array has numPoints size
  // the caller is responsible to release the array allocated by this method
  int32_t* computeConnectivity( std::vector < std::pair< int, size_t > > &indicesClasses );

  // determine point equivalence class length
  void evalConnectedVerticesIndicesClasses( int32_t* indirect, size_t numPoints,  
                                            std::vector < std::pair< int, size_t > > &indicesClasses ) const;

  // Returns TRUE if the two points are the same within given tolerance
  static SbBool equal(const SbVec3f &a, const SbVec3f &b, const float tol);

  static SbBool s_useOldTolerance;
};

#endif /* _SO_NORMAL_GENERATOR_ */

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Open Inventor Toolkit reference manual, generated on 4 Sep 2023
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