NAME

       SoSpotLight -

       The SoSpotLight class is a node type for light sources with a cone shaped lightvolume.

       Spotlights are light sources with a position and a direction. They can be thought of as a
       pointlight with a lampshade.

SYNOPSIS

       #include <Inventor/nodes/SoSpotLight.h>

       Inherits SoLight.

       Inherited by SoShadowSpotLight, and SoSpotLightManip.

   Public Member Functions
       virtual SoType getTypeId (void) const
           Returns the type identification of an object derived from a class inheriting SoBase.
           This is used for run-time type checking and 'downward' casting.
       SoSpotLight (void)
       virtual void GLRender (SoGLRenderAction *action)

   Static Public Member Functions
       static SoType getClassTypeId (void)
       static void initClass (void)

   Public Attributes
       SoSFVec3f location
       SoSFVec3f direction
       SoSFFloat dropOffRate
       SoSFFloat cutOffAngle

   Protected Member Functions
       virtual const SoFieldData * getFieldData (void) const
       virtual ~SoSpotLight ()

   Static Protected Member Functions
       static const SoFieldData ** getFieldDataPtr (void)

   Additional Inherited Members

Detailed Description

       The SoSpotLight class is a node type for light sources with a cone shaped lightvolume.

       Spotlights are light sources with a position and a direction. They can be thought of as a
       pointlight with a lampshade.

       See also documentation of parent class for important information regarding light sources
       in general.

       FILE FORMAT/DEFAULTS:

       SpotLight {
           on TRUE
           intensity 1
           color 1 1 1
           location 0 0 1
           direction 0 0 -1
           dropOffRate 0
           cutOffAngle 0.78539819
       }

       See Also:
           SoSpotLight

Constructor & Destructor Documentation

   SoSpotLight::SoSpotLight (void)
       Constructor.

   SoSpotLight::~SoSpotLight () [protected],  [virtual]
       Destructor.

Member Function Documentation

   SoType SoSpotLight::getTypeId (void) const [virtual]
       Returns the type identification of an object derived from a class inheriting SoBase. This
       is used for run-time type checking and 'downward' casting. Usage example:

       void foo(SoNode * node)
       {
         if (node->getTypeId() == SoFile::getClassTypeId()) {
           SoFile * filenode = (SoFile *)node;  // safe downward cast, knows the type
         }
       }

       For application programmers wanting to extend the library with new nodes, engines,
       nodekits, draggers or others: this method needs to be overridden in all subclasses. This
       is typically done as part of setting up the full type system for extension classes, which
       is usually accomplished by using the pre-defined macros available through for instance
       Inventor/nodes/SoSubNode.h (SO_NODE_INIT_CLASS and SO_NODE_CONSTRUCTOR for node classes),
       Inventor/engines/SoSubEngine.h (for engine classes) and so on.

       For more information on writing Coin extensions, see the class documentation of the
       toplevel superclasses for the various class groups.

       Reimplemented from SoLight.

       Reimplemented in SoSpotLightManip, and SoShadowSpotLight.

   const SoFieldData * SoSpotLight::getFieldData (void) const [protected],  [virtual]
       Returns a pointer to the class-wide field data storage object for this instance. If no
       fields are present, returns NULL.

       Reimplemented from SoLight.

       Reimplemented in SoSpotLightManip, and SoShadowSpotLight.

   void SoSpotLight::GLRender (SoGLRenderAction *action) [virtual]
       Action method for the SoGLRenderAction.

       This is called during rendering traversals. Nodes influencing the rendering state in any
       way or who wants to throw geometry primitives at OpenGL overrides this method.

       Reimplemented from SoNode.

       Reimplemented in SoSpotLightManip, and SoShadowSpotLight.

Member Data Documentation

   SoSFVec3f SoSpotLight::location
       3D position of light source. Default position is <0, 0, 1>.

   SoSFVec3f SoSpotLight::direction
       Direction vector, where the light is pointing. Default is to point along the negative z-
       axis.

   SoSFFloat SoSpotLight::dropOffRate
       The rate of intensity drop-off from the ray along the direction vector. Value must be
       between 0.0 (equal intensity for the whole cone of light), to 1.0 (a narrow intensity
       ray).

       Default value is 0.0.

   SoSFFloat SoSpotLight::cutOffAngle
       The angle in radians from the direction vector where there will be no light outside (i.e.
       the angle of the 'lampshade'). Default value is PI/4.0 (i.e. 45°). The value of this field
       will be clamped to [0.0, PI/2] before it is used.

Author

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