NAME

       SoDepthBuffer -

       The SoDepthBuffer class is a node used to control the GL depth buffer.

SYNOPSIS

       #include <SoDepthBuffer.h>

       Inherits SoNode.

   Public Types
       enum DepthWriteFunction { NEVER = SoDepthBufferElement::NEVER, ALWAYS =
           SoDepthBufferElement::ALWAYS, LESS = SoDepthBufferElement::LESS, LEQUAL =
           SoDepthBufferElement::LEQUAL, EQUAL = SoDepthBufferElement::EQUAL, GEQUAL =
           SoDepthBufferElement::GEQUAL, GREATER = SoDepthBufferElement::GREATER, NOTEQUAL =
           SoDepthBufferElement::NOTEQUAL }

   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.
       SoDepthBuffer (void)
       virtual void GLRender (SoGLRenderAction *action)

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

   Public Attributes
       SoSFBool test
       SoSFBool write
       SoSFEnum function
       SoSFVec2f range

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

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

   Additional Inherited Members

Detailed Description

       The SoDepthBuffer class is a node used to control the GL depth buffer.

       With this node you can control properties related to the OpenGL depth buffer in a variety
       of ways.

       • you can enable and disable depth buffer testing during rendering,

       • you can enable and disable writing to the depth buffer during rendering,

       • you can set the function used for the depth buffer testing, and

       • you can set the value range used in the depth buffer.

       The value range setting is useful if you need to segment the 3D world into different
       segments with different depth buffer resolutions to get a more optimal depth buffer
       resolution distribution than what a single, uniform depth buffer value range can give you.

       Be aware that this class is an extension for Coin, and it is not available in the original
       SGI Open Inventor v2.1 API.

       Since:
           Coin 3.0

Member Enumeration Documentation

   enum SoDepthBuffer::DepthWriteFunction
       Enumeration for the various depth functions.

       Enumerator

       NEVER  Never passes.

       ALWAYS Always passes.

       LESS   Passes if the incoming depth value is less than the stored depth value.

       LEQUAL Passes if the incoming depth value is less than or equal to the stored depth value.

       EQUAL  Passes if the incoming depth value is equal to the stored depth value.

       GEQUAL Passes if the incoming depth value is greater than or equal to the stored depth
              value.

       GREATER
              Passes if the incoming depth value is greater than the stored depth value.

       NOTEQUAL
              Passes if the incoming depth value is not equal to the stored depth value.

Constructor & Destructor Documentation

   SoDepthBuffer::SoDepthBuffer (void)
       Constructor.

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

Member Function Documentation

   SoType SoDepthBuffer::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.

       Implements SoBase.

   const SoFieldData * SoDepthBuffer::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 SoFieldContainer.

   void SoDepthBuffer::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.

Member Data Documentation

   SoSFBool SoDepthBuffer::test
       Enable depth buffer testing. Defaults to TRUE.

   SoSFBool SoDepthBuffer::write
       Enable depth buffer writing. Defaults to TRUE.

   SoSFEnum SoDepthBuffer::function
       Which depth function to use. Defaults to LESS.

   SoSFVec2f SoDepthBuffer::range
       The value range for the depth buffer data. Defaults to [0.0-1.0]. The range will be
       clamped to [0.0-1.0].

Author

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