SoNormalElement.h

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**=======================================================================*/
/*=======================================================================
** Author      : 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_ELEMENT
#define  _SO_NORMAL_ELEMENT
 
 
 
#include <Inventor/SbLinear.h>
#include <Inventor/elements/SoReplacedElement.h>
#include <Inventor/errors/SoDebugError.h>
 
SoEXTENDER_Documented class  SoNormalElement : public SoReplacedElement {
 
  SO_ELEMENT_HEADER(SoNormalElement);
 
 public:
  static void         set(SoState *state, SoNode *node,
                          int32_t numNormals, const SbVec3f *normals);
 
  static const SoNormalElement * getInstance(SoState *state)
    {return getConstElement<SoNormalElement>(state);}
 
  int32_t             getNum() const          { return numNormals; }
 
  const SbVec3f &     get(int index) const
    {
      if (index < 0 || index >= numNormals)
      {
#if defined(_DEBUG)
        SoDebugError::post("SoNormalElement::get",
                           "Index (%d) is out of range 0 - %d",
                           index, numNormals - 1);
#endif
        return defaultNormal;
      }
      return normals[index];
    }
 
  virtual void        print(FILE *fp) const;
 
private:
 
  virtual void init(SoState *state);
 
 private:
  // Initializes the SoNormalElement class
  static void         initClass();
  static void         exitClass();
 
 private:
  int32_t             numNormals;
  const SbVec3f       *normals;
 
  virtual ~SoNormalElement();
 
 private:
  // This stores a pointer to the default normal so that we can set
  // "normals" to point to it if no other normal has been set.
  static SbVec3f defaultNormal;
};
 
#endif /* _SO_NORMAL_ELEMENT */