SoTangentGenerator.h

/*=================================================================================
*** THE CONTENT OF THIS WORK IS PROPRIETARY TO FEI S.A.S, (FEI S.A.S.),        ***
***              AND IS DISTRIBUTED UNDER A LICENSE AGREEMENT.                 ***
***                                                                            ***
***  REPRODUCTION, DISCLOSURE,  OR USE,  IN WHOLE OR IN PART,  OTHER THAN AS   ***
***  SPECIFIED  IN THE LICENSE ARE  NOT TO BE  UNDERTAKEN  EXCEPT WITH PRIOR   ***
***  WRITTEN AUTHORIZATION OF FEI S.A.S.                                       ***
***                                                                            ***
***                        RESTRICTED RIGHTS LEGEND                            ***
***  USE, DUPLICATION, OR DISCLOSURE BY THE GOVERNMENT OF THE CONTENT OF THIS  ***
***  WORK OR RELATED DOCUMENTATION IS SUBJECT TO RESTRICTIONS AS SET FORTH IN  ***
***  SUBPARAGRAPH (C)(1) OF THE COMMERCIAL COMPUTER SOFTWARE RESTRICTED RIGHT  ***
***  CLAUSE  AT FAR 52.227-19  OR SUBPARAGRAPH  (C)(1)(II)  OF  THE RIGHTS IN  ***
***  TECHNICAL DATA AND COMPUTER SOFTWARE CLAUSE AT DFARS 52.227-7013.         ***
***                                                                            ***
***                   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;
};