SoEnvironment.h

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**=======================================================================*/
/*=======================================================================
** Author      : Paul S. Strauss (MMM yyyy)
**=======================================================================*/
/*=======================================================================
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**=======================================================================*/
/*=======================================================================
** Modified by : VSG (MMM YYYY)
**=======================================================================*/
 
 
#ifndef  _SO_ENVIRONMENT_
#define  _SO_ENVIRONMENT_
 
#include <Inventor/fields/SoSFBool.h>
#include <Inventor/fields/SoSFColor.h>
#include <Inventor/fields/SoSFEnum.h>
#include <Inventor/fields/SoSFFloat.h>
#include <Inventor/fields/SoSFVec3f.h>
#include <Inventor/fields/SoSFBool.h>
#include <Inventor/nodes/SoNode.h>
 
//
//  Class: SoEnvironment
//
//  Node that describes global environmental attributes such as
//  ambient lighting, light attenuation, and fog.
//
//  Ambient lighting is the amount of extra light impinging on each
//  surface point when computing Phong lighting. 
//
//  Light attenuation affects all subsequent lights in a scene. It is
//  a quadratic function of distance from a light source to a surface
//  point. The three coefficients are specified in the attenuation
//  field. Attenuation works only for light sources with a fixed
//  location, such as point and spot lights.
//
//  Fog has one of four types, each of which blends each surface point
//  with the specified fog color. Each type interprets the visibility
//  field to be the distance at which fog totally obscures objects. A
//  visibility value of 0 (the default) causes the SoEnvironment node
//  to set up fog so that the visibility is the distance to the far
//  clipping plane of the current camera.
//
//  Note that this node has effect only during rendering, and that it
//  does not inherit field values from other SoEnvironment nodes.
//
 
class  SoEnvironment : public SoNode {
 
  SO_NODE_HEADER(SoEnvironment);
 
 public:
  enum FogType {
    NONE,
    HAZE,
    FOG,
    SMOKE
  };
 
  // Fields
 
  SoSFFloat           ambientIntensity;
  SoSFColor           ambientColor;
 
  SoSFVec3f           attenuation;
 
  SoSFBool            ambientOcclusion;
 
  SoSFFloat ambientOcclusionIntensity;
 
  SoSFFloat ambientOcclusionRadius;
 
  SoSFEnum            fogType;
  SoSFColor           fogColor;
  SoSFFloat           fogStart;
  SoSFFloat           fogVisibility;
 
  SoEnvironment();
 
  inline virtual void setOverride(const SbBool state)
  { override.setValue(state); }
 
  inline virtual SbBool isOverride() const
  { return override.getValue(); }
 
 private:
  // Only rendering is implemented, since this node has no other effects
  virtual void GLRender(SoGLRenderAction *action);
  virtual void callback(SoCallbackAction *action);
  virtual void doAction(SoAction *action);
 
 private:
  static void         initClass();
  static void         exitClass();
 
  SoSFBool override;
 
 private:
  virtual ~SoEnvironment();
 
};
 
#endif /* _SO_ENVIRONMENT_ */