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SoAnnotation.3coin2

NAME

SoAnnotation -

The SoAnnotation node draws all its child geometry on top of other geometry.

This group-type node uses delayed rendering in combination with Z-buffer disabling to let its children transparently render their geometry on top of the other geometry in the scene.

SYNOPSIS

#include <Inventor/nodes/SoAnnotation.h>

Inherits SoSeparator.

Public Member Functions

SoAnnotation (void)

virtual void GLRender (SoGLRenderAction *action)

virtual void GLRenderBelowPath (SoGLRenderAction *action)

virtual void GLRenderInPath (SoGLRenderAction *action)

virtual void GLRenderOffPath (SoGLRenderAction *action)

Static Public Member Functions

static void initClass (void)

Protected Member Functions

virtual ~SoAnnotation ()

Detailed Description

The SoAnnotation node draws all its child geometry on top of other geometry.

This group-type node uses delayed rendering in combination with Z-buffer disabling to let its children transparently render their geometry on top of the other geometry in the scene.

Since the Z-buffer needs to be disabled, the childrens' geometry will not be rendered back-to-front sorted, but rather in the order they are present in the scenegraph.

FILE FORMAT/DEFAULTS:

     Annotation {
         renderCaching AUTO
         boundingBoxCaching AUTO
         renderCulling AUTO
         pickCulling AUTO
     }
 
 

 

Constructor & Destructor Documentation

SoAnnotation::SoAnnotation (void)Constructor.

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

Member Function Documentation

void SoAnnotation::initClass (void) [static]Sets up initialization for data common to all instances of this class, like submitting necessary information to the Coin type system.

Reimplemented from SoSeparator.

void SoAnnotation::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 SoSeparator.

References SoAction::getCurPathCode(), GLRenderBelowPath(), and GLRenderInPath().

void SoAnnotation::GLRenderBelowPath (SoGLRenderAction * action) [virtual]SGI Open Inventor v2.1 obsoleted support for SoGLRenderAction::addMethod(). Instead, GLRender() might be called directly, and to optimize traversal, the SoSeparator node calls GLRenderBelowPath whenever the path code is BELOW_PATH or NO_PATH (path code is guaranteed not to change). To be compatible with SGI's Inventor (and thereby also TGS') we have chosen to follow their implementation in this respect.

SoSeparator::GLRenderBelowPath() do not traverse its children using SoChildList::traverse(), but calls GLRenderBelowPath() directly for all its children.

Reimplemented from SoSeparator.

References SoGLRenderAction::addDelayedPath(), SoPath::copy(), SoAction::getCurPath(), SoAction::getState(), SoSeparator::GLRenderBelowPath(), and SoGLRenderAction::isRenderingDelayedPaths().

Referenced by GLRender().

void SoAnnotation::GLRenderInPath (SoGLRenderAction * action) [virtual]Implements the SoAction::IN_PATH traversal method for the rendering action.

Reimplemented from SoSeparator.

References SoGLRenderAction::addDelayedPath(), SoPath::copy(), SoAction::getCurPath(), SoAction::getState(), SoSeparator::GLRenderInPath(), and SoGLRenderAction::isRenderingDelayedPaths().

Referenced by GLRender().

void SoAnnotation::GLRenderOffPath (SoGLRenderAction * action) [virtual]Implements the SoAction::OFF_PATH traversal method for the rendering action.

Reimplemented from SoSeparator.

Author

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