Inventor/elements/SoDepthOffsetElement.h

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**=======================================================================*/
/*=======================================================================
** Author      : Nicolas DAGUISE (Dec 2008)
**=======================================================================*/

#ifndef  SO_DEPTH_OFFSET_ELEMENT_H
#define  SO_DEPTH_OFFSET_ELEMENT_H

#include <Inventor/elements/SoFloatElement.h>

SoEXTENDER_Documented class  SoDepthOffsetElement : public SoFloatElement
{

  SO_ELEMENT_HEADER(SoDepthOffsetElement);
  
public:

  static void set(SoState *state, float offset);

#ifndef IV_STRICT

  static void set(SoState *state, SoNode *, float offset);
#endif

  static void set(SoState *state, float, float, float);

  static float get(SoState *state);

  static void setMaxOffset(SoState *state, float offset);

  static float getMaxOffset(SoState *state);

  virtual void push( SoState* );

  virtual void pop(SoState*, const SoElement*);

private:

  virtual void init(SoState *state);

private:
  // Initializes the class
  static void initClass();
    static void exitClass();

  static void setNormalizationFactor(SoState *state, float value);

  static float getNormalizationFactor(SoState *state);

  static void setNDCadjustment(SoState *state, float value);

  static float getNDCadjustment(SoState *state);

  static void evalGlobalFactors(float offset, float& NDCadjustment, float &normFactor);

  // Specify the version of depth offset used :
  // V1 : Depth offset modifies camera projection matrix
  // V2 : Depth offset modifies projection matrix only here
  //      To have the same behavior than V1, you have to add a DepthOffset node
  //      with an offset at 0 on the root of the scene graph.
  enum DepthOffsetVersion
  {
    NONE = -1,
    V1 = 1,
    V2
  };

  static DepthOffsetVersion getDepthOffsetVersion();

  static void copyDepthOffset( SoState* dstState, SoState* srcState );

private:
  virtual ~SoDepthOffsetElement();

  float maxOffset;
  float localdata;
  float normalizationFactor;
  float NDCadjustment;

private :

  static DepthOffsetVersion s_depthOffsetVersion;
};

#endif // SO_DEPTH_OFFSET_ELEMENT_H

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Open Inventor Toolkit reference manual, generated on 12 Feb 2024
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