NAME

       SoEnvironment — global environment node

INHERITS FROM

       SoBase > SoFieldContainer > SoNode > SoEnvironment

SYNOPSIS

       #include <Inventor/nodes/SoEnvironment.h>

     enum FogType {
          SoEnvironment::NONE   No fog
          SoEnvironment::HAZE   Linear increase in opacity with distance
          SoEnvironment::FOG    Exponential increase in opacity
          SoEnvironment::SMOKE  Exponential squared increase in opacity
     }

          Fields from class SoEnvironment:

     SoSFFloat           ambientIntensity
     SoSFColor           ambientColor
     SoSFVec3f           attenuation
     SoSFEnum            fogType
     SoSFColor           fogColor
     SoSFFloat           fogVisibility

          Methods from class SoEnvironment:

                         SoEnvironment()
     static SoType       getClassTypeId()

          Methods from class SoNode:

     void                setOverride(SbBool state)
     SbBool              isOverride() const
     SoNode *            copy(SbBool copyConnections = FALSE) const
     virtual SbBool      affectsState() const
     static SoNode *     getByName(const SbName &name)
     static int          getByName(const SbName &name, SoNodeList &list)

          Methods from class SoFieldContainer:

     void                setToDefaults()
     SbBool              hasDefaultValues() const
     SbBool              fieldsAreEqual(const SoFieldContainer *fc) const
     void                copyFieldValues(const SoFieldContainer *fc, SbBool copyConnections = FALSE)
     SbBool              set(const char *fieldDataString)
     void                get(SbString &fieldDataString)
     virtual int         getFields(SoFieldList &resultList) const
     virtual SoField *   getField(const SbName &fieldName) const
     SbBool              getFieldName(const SoField *field, SbName &fieldName) const
     SbBool              isNotifyEnabled() const
     SbBool              enableNotify(SbBool flag)

          Methods from class SoBase:

     void                ref()
     void                unref() const
     void                unrefNoDelete() const
     void                touch()
     virtual SoType      getTypeId() const
     SbBool              isOfType(SoType type) const
     virtual void        setName(const SbName &name)
     virtual SbName      getName() const

DESCRIPTION

       This node 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 the lighting model is
       Phong (see SoLightModel).

       Light attenuation affects all subsequent lights in a scene (see SoLight). 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.

FIELDS

     SoSFFloat           ambientIntensity
     SoSFColor           ambientColor
          Intensity and RGB color of ambient lighting (for Phong lighting).

     SoSFVec3f           attenuation
          Squared,  linear, and constant light attenuation coefficients (in that order) with respect to distance
          of light from surface (for Phong lighting).

     SoSFEnum            fogType
     SoSFColor           fogColor
     SoSFFloat           fogVisibility
          Type of fog, color of fog, and visibility distance,  which  is  the  distance  at  which  fog  totally
          obscures objects.

METHODS

                         SoEnvironment()
          Creates an environment node with default settings.

     static SoType       getClassTypeId()
          Returns type identifier for this class.

ACTION BEHAVIOR

       SoGLRenderAction
          Sets  the current environment parameters to those specified with this node. Successive geometries will
          be rendered using this environment.

FILE FORMAT/DEFAULTS

       Environment {
          ambientIntensity  0.2
          ambientColor      1 1 1
          attenuation       0 0 1
          fogType           NONE
          fogColor          1 1 1
          fogVisibility     0
     }

SEE ALSO

       SoLight, SoLightModel

                                                                                            SoEnvironment(3IV)()