SoLOD.h

/*=======================================================================
 * Copyright 1991-1996, Silicon Graphics, Inc.
 * ALL RIGHTS RESERVED
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 * in Technical Data and Computer Software clause at DFARS 252.227-7013 and/or
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 * Supplement.  Contractor/manufacturer is Silicon Graphics, Inc.,
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**=======================================================================*/
/*=======================================================================
** Author      : Gavin Bell (MMM yyyy)
**=======================================================================*/
/*=======================================================================
 *** THE CONTENT OF THIS WORK IS PROPRIETARY TO FEI S.A.S, (FEI S.A.S.),            ***
 ***              AND IS DISTRIBUTED UNDER A LICENSE AGREEMENT.                     ***
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 ***  REPRODUCTION, DISCLOSURE,  OR USE,  IN WHOLE OR IN PART,  OTHER THAN AS       ***
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 ***  CLAUSE  AT FAR 52.227-19  OR SUBPARAGRAPH  (C)(1)(II)  OF  THE RIGHTS IN      ***
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 ***                        BORDEAUX, FRANCE                                        ***
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**=======================================================================*/
/*=======================================================================
** Modified by : VSG (MMM YYYY)
**=======================================================================*/
 
 
#ifndef  _SO_LOD_
#define  _SO_LOD_
 
#include <Inventor/fields/SoMFFloat.h>
#include <Inventor/fields/SoSFVec3f.h>
#include <Inventor/nodes/SoGroup.h>
 
//
//  Class: SoLOD
//
//  Level-of-detail group node. The children of this node typically
//  represent the same object or objects at varying levels of detail,
//  from highest detail to lowest.  The world-space distance of the
//  eye from the transformed center of the LOD is computed, and one
//  child is drawn, based on the values in the ranges field.
//
//  More precisely, if the distance from the eyepoint to the
//  transformed center is D and the ranges array contains LAST_RANGE+1
//  values (numbered 0...LAST_RANGE), then:
//
//  D < ranges[0]  : Child 0 is drawn
//  ranges[i-1] < D < ranges[i] : Child i is drawn
//  D > ranges[LAST_RANGE] : Child LAST_RANGE+1 is drawn
//
//  So, you should specify N ranges and N+1 children.  If you specify
//  too few children, the last child will be used for the extra
//  ranges.  If you specify too few ranges, the extra children will
//  never be used.
//
//  Add an SoInfo node as a child if you want a level of detail
//  that doesn't draw anything.
//
 
class  SoLOD : public SoGroup {
 
  SO_NODE_HEADER(SoLOD);
 
 public:
  // Fields
  SoMFFloat           range;
  SoSFVec3f           center;
 
  SoLOD();
 
  SoLOD(int nChildren);
 
 private:
  // Implement actions:
  virtual void        doAction(SoAction *action);
  virtual void        callback(SoCallbackAction *action);
  virtual void        GLRender(SoGLRenderAction *action);
  virtual void        rayPick(SoRayPickAction *action);
  virtual void        getBoundingBox(SoGetBoundingBoxAction *action);
  virtual void        getPrimitiveCount(SoGetPrimitiveCountAction *action);
 
  // These methods make render traversal faster by implementing
  // different rendering paths corresponding to different action
  // path codes.
  virtual void        GLRenderBelowPath(SoGLRenderAction *action);
  virtual void        GLRenderInPath(SoGLRenderAction *action);
  virtual void        GLRenderOffPath(SoGLRenderAction *action);
 
 private:
  static void         initClass();
  static void         exitClass();
 
 private:
  virtual ~SoLOD();
 
  virtual int         whichToTraverse(SoAction *);
};
 
#endif /* _SO_LOD_ */