SoTangentGenerator.h

/*=================================================================================
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***                   COPYRIGHT (C) 1996-2019 BY FEI S.A.S,                    ***
***                              BORDEAUX, FRANCE                              ***
***                            ALL RIGHTS RESERVED                             ***
=================================================================================*/
 
#pragma once
 
#include <Inventor/SbLinear.h>
#include <Inventor/elements/SoTangentBindingElement.h>
 
{
public:
  SoTangentGenerator( bool useLines, int approxNumVertices = 16 );
  ~SoTangentGenerator();
 
  void setupApproxShapeSize( int32_t approxNumVertices );
 
  void beginLineStrip();
  void lineStripVertex( const SbVec3f& point );
  void endLineStrip();
 
  void setupIndexedVertexArray( const SbVec3f* pointArray );
 
  void lineStripVertex( const int32_t pointIndex );
 
  void generate();
 
  int getNumTangents() const
  {
    return m_numVertTangents;
  }
 
  const SbVec3f* getTangents() const
  {
    return m_vertTangents;
  }
 
  const SbVec3f& getTangent( int32_t i ) const
  {
    return m_vertTangents[i];
  }
 
  SoTangentBindingElement::Binding getBinding() const
  {
    return m_binding;
  }
 
  void setTangent( int32_t index, const SbVec3f& newTangent );
 
  private:
    void setTangentBuffer( int32_t numTangents, const SbVec3f* tangents );
 
private:
  SbVec3f computeTangent( const SbVec3f& previous, const SbVec3f& current, const SbVec3f& next ) const;
 
  std::vector<SbVec3f> m_tangents;
  std::vector<SbVec3f> m_polylinePoints;
 
  const SbVec3f* m_points;
  const SbVec3f* m_vertTangents;
 
  int32_t m_numVertTangents;
  SoTangentBindingElement::Binding m_binding;
  bool m_useLines;
  static int s_generationMode;
};