SoDepthBuffer.3coin3 - Man Page

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


#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
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.

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.

Coin 3.0

Member Enumeration Documentation

enum SoDepthBuffer::DepthWriteFunction

Enumeration for the various depth functions.



Never passes.


Always passes.


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


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


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


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


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


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

Constructor & Destructor Documentation

SoDepthBuffer::SoDepthBuffer (void)


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


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].


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Mon Jan 25 2021 Version 3.1.3 Coin