SoTangentElement.h

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#pragma once
 
#include <Inventor/SbLinear.h>
#include <Inventor/elements/SoReplacedElement.h>
#include <Inventor/errors/SoDebugError.h>
 
SoEXTENDER_Documented class  SoTangentElement : public SoReplacedElement
{
  SO_ELEMENT_HEADER( SoTangentElement );
 
public:
  static void set( SoState* state, SoNode* node, int32_t numTangents, const SbVec3f* tangents );
 
  static const SoTangentElement* getInstance( SoState* state )
  {
    return getConstElement<SoTangentElement>( state );
  }
 
  int32_t getNum() const
  {
    return m_numTangents;
  }
 
  const SbVec3f& get( int index ) const
  {
    if ( index < 0 || index >= m_numTangents )
    {
#if defined(_DEBUG)
      SoDebugError::post( "SoTangentElement::get",
                          "Index (%d) is out of range 0 - %d",
                          index, m_numTangents - 1 );
#endif
      return s_defaultTangent;
    }
    return m_tangents[index];
  }
 
  virtual void print( FILE* fp ) const;
 
private:
  virtual void init( SoState* state );
 
private:
  // Initializes the SoTangentElement class
  static void initClass();
  static void exitClass();
 
private:
  int32_t m_numTangents;
  const SbVec3f* m_tangents;
 
  virtual ~SoTangentElement();
 
private:
  static SbVec3f s_defaultTangent;
};