Provided by: libcoin80-doc_3.1.4~abc9f50-4ubuntu2_all 
NAME
SoGLRenderAction -
The SoGLRenderAction class renders the scene graph with OpenGL calls.
Applying this method at a root node for a scene graph, path or pathlist will render all
geometry contained within that instance to the current OpenGL context.
SYNOPSIS
#include <Inventor/actions/SoGLRenderAction.h>
Inherits SoAction.
Inherited by SoBoxHighlightRenderAction, and SoLineHighlightRenderAction.
Public Types
enum TransparencyType { SCREEN_DOOR, ADD, DELAYED_ADD, SORTED_OBJECT_ADD, BLEND,
DELAYED_BLEND, SORTED_OBJECT_BLEND, SORTED_OBJECT_SORTED_TRIANGLE_ADD,
SORTED_OBJECT_SORTED_TRIANGLE_BLEND, NONE, SORTED_LAYERS_BLEND }
enum TransparentDelayedObjectRenderType { ONE_PASS, NONSOLID_SEPARATE_BACKFACE_PASS }
enum AbortCode { CONTINUE, ABORT, PRUNE, DELAY }
enum SortedObjectOrderStrategy { BBOX_CENTER, BBOX_CLOSEST_CORNER, BBOX_FARTHEST_CORNER,
CUSTOM_CALLBACK }
typedef AbortCode SoGLRenderAbortCB (void *userdata)
Public Member Functions
virtual SoType getTypeId (void) const
SoGLRenderAction (const SbViewportRegion &viewportregion)
virtual ~SoGLRenderAction (void)
void setViewportRegion (const SbViewportRegion &newregion)
const SbViewportRegion & getViewportRegion (void) const
void setUpdateArea (const SbVec2f &origin, const SbVec2f &size)
void getUpdateArea (SbVec2f &origin, SbVec2f &size) const
void setAbortCallback (SoGLRenderAbortCB *const func, void *const userdata)
void getAbortCallback (SoGLRenderAbortCB *&func_out, void *&userdata_out) const
void setTransparencyType (const TransparencyType type)
TransparencyType getTransparencyType (void) const
void setTransparentDelayedObjectRenderType (TransparentDelayedObjectRenderType type)
TransparentDelayedObjectRenderType getTransparentDelayedObjectRenderType (void) const
void setSmoothing (const SbBool smooth)
SbBool isSmoothing (void) const
void setNumPasses (const int num)
int getNumPasses (void) const
void setPassUpdate (const SbBool flag)
SbBool isPassUpdate (void) const
void setPassCallback (SoGLRenderPassCB *const func, void *const userdata)
void setCacheContext (const uint32_t context)
uint32_t getCacheContext (void) const
void addDelayedPath (SoPath *path)
SbBool isRenderingDelayedPaths (void) const
SbBool handleTransparency (SbBool istransparent=FALSE)
void setCurPass (const int passnum, const int numpasses)
int getCurPass (void) const
SbBool abortNow (void)
void setRenderingIsRemote (SbBool isremote)
SbBool getRenderingIsRemote (void) const
virtual void invalidateState (void)
void addPreRenderCallback (SoGLPreRenderCB *func, void *userdata)
void removePreRenderCallback (SoGLPreRenderCB *func, void *userdata)
void setSortedLayersNumPasses (int num)
int getSortedLayersNumPasses (void) const
void setSortedObjectOrderStrategy (const SortedObjectOrderStrategy strategy,
SoGLSortedObjectOrderCB *cb=NULL, void *closure=NULL)
void setDelayedObjDepthWrite (SbBool write)
SbBool getDelayedObjDepthWrite (void) const
SbBool isRenderingTranspPaths (void) const
SbBool isRenderingTranspBackfaces (void) const
Static Public Member Functions
static SoType getClassTypeId (void)
static void addMethod (const SoType type, SoActionMethod method)
static void enableElement (const SoType type, const int stackindex)
static void initClass (void)
Protected Member Functions
virtual const
SoEnabledElementsList & getEnabledElements (void) const "
virtual void beginTraversal (SoNode *node)
virtual void endTraversal (SoNode *node)
Static Protected Member Functions
static SoEnabledElementsList * getClassEnabledElements (void)
static SoActionMethodList * getClassActionMethods (void)
Additional Inherited Members
Detailed Description
The SoGLRenderAction class renders the scene graph with OpenGL calls.
Applying this method at a root node for a scene graph, path or pathlist will render all
geometry contained within that instance to the current OpenGL context.
Member Typedef Documentation
typedef SoGLRenderAction::SoGLRenderAbortCB
Abort callbacks should be of this type.
See Also:
setAbortCallback()
Member Enumeration Documentation
enum SoGLRenderAction::TransparencyType
Various settings for how to do rendering of transparent objects in the scene. Some of the
settings will provide faster rendering, while others give you better quality rendering.
Note that doing correct rendering of multiple transparent objects often fails, because to
be 100% correct, all polygons needs to be rendered in sorted order, and polygons can't
intersect each other. In a dynamic scene graph it is often impossible to guarantee that no
polygons intersect, and finding an algorithm that does correct sorting of polygons for all
possible cases is very hard and time-consuming.
The highest quality transparency mode in the original SGI / TGS Open Inventor is
SoGLRenderAction::SORTED_OBJECT_BLEND, where all transparent objects are rendered in
sorted order in a rendering pass after all opaque objects. However, this mode does not
sort the polygons, and if you have an object where some polygon A is behind some other
polygon B, the transparency will only be correct if A happens to be rendered before B. For
other camera angles, where B is behind A, the transparency will not be correct.
In Coin we have a new transparency mode that solves some of these problems:
SoGLRenderAction::SORTED_OBJECT_SORTED_TRIANGLE_BLEND. In addition to sorting the objects,
all polygons inside each object is also sorted back-to-front when rendering. But, if you
have intersecting objects and/or intersecting polygons, even this transparency mode will
fail. Also, because of the polygon sorting, this transparency mode is quite slow. It is
possible to speed things up using the SoTransparencyType node, though, which enables you
to set different transparency modes for different parts of the scene graph. If you have
only have a few objects where you need to sort the polygons, you can use
SoGLRenderAction::SORTED_OBJECT_SORTED_TRIANGLE_BLEND for those, and for instance
SoGLRenderAction::SORTED_OBJECT_BLEND for all other transparent objects.
The highest quality transparency mode in Coin is SoGLRenderAction::SORTED_LAYERS_BLEND. It
is also the only mode that overrides all other modes in the scenegraph.
(One important note about this mode: we've had reports from users that some OpenGL drivers
-- possibly particular for some Mac OS X systems -- significantly degrades rendering
performance. So be careful and test your application on a wide variety of run-time systems
when using SoGLRenderAction::SORTED_LAYERS_BLEND.)
See Also:
SoTransparencyType
Enumerator
SCREEN_DOOR
Transparent triangles are rendered with a dither pattern. This is a fast (on most
GFX cards) but not-so-high-quality transparency mode.
One particular feature of this mode is that you are guaranteed that it always renders the
transparent parts of the scene correct with regard to internal depth ordering of objects /
polygons, something which is not the case for any other transparency mode.
Polygons rendered with only transparent textures are not shown as being transparent when
using this mode. The reason being that the SCREEN_DOOR mode is working on polygons, not
pixels. To render polygons with dither pattern, a material node has to be inserted into
the scenegraph with it's transparency field set.
ADD Transparent objects are rendered using additive alpha blending. Additive blending
is probably mostly used to create special transparency effects. The new pixel color
is calculated as the current pixel color plus the source pixel color multiplied
with the source pixel alpha value.
DELAYED_ADD
SoGLRenderAction::DELAYED_ADD Transparent objects are rendered using additive alpha
blending, in a second rendering pass with depth buffer updates disabled.
SORTED_OBJECT_ADD
Transparent objects are rendered using additive alpha blending. Opaque objects are
rendered first, and transparent objects are rendered back to front with z-buffer
updates disabled.
BLEND Transparent objects are rendered using multiplicative alpha blending.
Multiplicative alpha blending is the blending type that is most often used to render
transparent objects. The new pixel value is calculated as the old pixel color multiplied
with one minus the source alpha value, plus the source pixel color multiplied with the
source alpha value.
We recommend that you use this transparency mode if you have only one transparent object
in your scene, and you know that it will be rendered after the opaque objects.
DELAYED_BLEND
Transparent objects are rendered using multiplicative alpha blending, in a second
rendering pass with depth buffer updates disabled.
Use this transparency type when you have one transparent object, or several transparent
object that you know will never overlap (when projected to screen). Since the transparent
objects are rendered after opaque ones, you'll not have to worry about putting the
transparent objects at the end of your scene graph. It will not be as fast as the BLEND
transparency type, of course, since the scene graph is traversed twice.
SORTED_OBJECT_BLEND
Transparent objects are rendered using multiplicative alpha blending, Opaque
objects are rendered first, and transparent objects are rendered back to front with
z-buffer updates disabled.
Use this transparency mode when you have several transparent object that you know might
overlap (when projected to screen). This method will require 1 + num_transparent_objects
rendering passes. Path traversal is used when rendering transparent objects, of course,
but it might still be slow if you have lots of state changes before your transparent
object. When using this mode, we recommend placing the transparent objects as early as
possible in the scene graph to minimize traversal overhead.
SORTED_OBJECT_SORTED_TRIANGLE_ADD
This transparency type is a Coin extension versus the original SGI Open Inventor
API.
Transparent objects are rendered back to front, and triangles in each object are sorted
back to front before rendering.
See description for SORTED_OBJECT_SORTED_TRIANGLE_BLEND for more information about this
transparency type.
SORTED_OBJECT_SORTED_TRIANGLE_BLEND
This transparency type is a Coin extension versus the original SGI Open Inventor
API.
Transparent objects are rendered back to front, and triangles in each object are sorted
back to front before rendering.
Use this transparency type when you have one (or more) transparent object(s) where you
know triangles might overlap inside the object. This transparency type might be very slow
if you have an object with lots of triangles, since all triangles have to be sorted before
rendering, and an unoptimized rendering loop is used when rendering. Lines and points are
not sorted before rendering. They are rendered as in the normal SORTED_OBJECT_BLEND
transparency type.
Please note that this transparency mode does not guarantee 'correct' transparency
rendering. It is almost impossible to find an algorithm that will sort triangles correctly
in all cases, and intersecting triangles are not handled. Also, since each object is
handled separately, two intersecting object will lead to incorrect transparency.
NONE This transparency type is a Coin extension versus the Open Inventor API.
Turns off transparency for objects, even if transparency is set using an SoMaterial node.
Since:
Coin 1.0
SORTED_LAYERS_BLEND
This transparency type is a Coin extension versus the original SGI Open Inventor
API.
By using this transparency type, the SoGLRenderAction will render normal and intersecting
transparent objects correctly independent of rendering order. It is the only transparency
type rendering mode which is guaranteed to do so.
This mode is different from all other modes in that it overrides the SoTransparencyType
nodes in the scenegraph; all objects are drawn using SORTED_LAYERS_BLEND.
There are currently two separate code paths for this mode. Both paths are heavily based on
OpenGL extensions. The first method is based on extensions which are only available on
NVIDIA chipsets (GeForce3 and above, except GeForce4 MX). These extensions are
GL_NV_texture_shader, GL_NV_texture_rectangle or GL_EXT_texture_rectangle,
GL_NV_register_combiners, GL_ARB_shadow and GL_ARB_depth_texture. Please note that this
transparency type occupy all four texture units on the NVIDIA card for all the rendering
passes, except the first. Textured surfaces will therefore only be textured if they are
not occluded by another transparent surface.
The second method utilise the GL_ARB_fragment_program extension. This extension is
currently supported by the GeForceFX family and the Radeon 9500 and above. This technique
is faster than the pure NVIDIA method. The fragment program method will automatically be
chosen if possible. Please note that one should beware not to place the near-plane too
close to the camera due to the lack of floating point precision control in fragment
programs. Doing so may lead to loss of precision around the edges and 'jaggedness' of the
transparent geometry.
Setting the environment variable COIN_SORTED_LAYERS_USE_NVIDIA_RC to '1' will force the
use of former code path instead of the latter, even if it is available.
A rendering context with >= 24 bits depth buffer and 8 bits alpha channel must be the
current rendering context for this blending mode to actually become activated. If the
current rendering canvas does not have these properties, Coin will fall back on a simpler
transparency handling mode. If you are using one of the window-system binding libraries
provided by Kongsberg Oil & Gas Technologies, e.g. SoXt, SoQt or SoWin, you will need to
explicitly enable this in your viewer. See the API documentation of the setAlphaChannel()
method of either SoXtGLWidget, SoQtGLWidget or SoWinGLWidget.
The detection of whether or not the SORTED_LAYERS_BLEND mode can be used will be done
automatically by the Coin internals. If one or more of the necessary conditions listed
above are unavailable, SoGLRenderAction::SORTED_OBJECT_BLEND will be used as the
transparency type instead.
To be able to render correct transparency independent of object order, one have to render
in multiple passes. This technique is based on depth-peeling which strips away depth
layers with each successive pass. The number of passes is therefore an indication of how
deep into the scene transparent surfaces will be rendered with transparency. A higher
number will lead to a lower framerate but higher quality for scenes with a lot of
transparent surfaces. The default number of passes is '4'. This number can be specified
using the SoGLRenderAction::setSortedLayersNumPasses() or by letting the environment
variable COIN_NUM_SORTED_LAYERS_PASSES or OIV_NUM_SORTED_LAYERS_PASSES specify the number
of passes.
A more detailed presentation of the algorithm is written by Cass Everitt at NVIDIA;
Since:
Coin 2.2
TGS Inventor 4.0
enum SoGLRenderAction::TransparentDelayedObjectRenderType
Enumerates the render types of transparent objects.
Enumerator
ONE_PASS
Normal one pass rendering. This might cause artifacts for non-solid objects.
NONSOLID_SEPARATE_BACKFACE_PASS
Non-solid objects are handled in an extra rendering pass. Backfacing polygons are
rendered in the first pass, and the front facing in the second pass.
enum SoGLRenderAction::AbortCode
The return codes which an SoGLRenderAbortCB callback function should use.
See Also:
setAbortCallback()
Enumerator
CONTINUE
Continue rendering as usual.
ABORT Abort the rendering action immediately.
PRUNE Do not render the current node or any of its children, but continue the rendering
traversal.
DELAY Delay rendering of the current node (and its children) until the next rendering
pass.
enum SoGLRenderAction::SortedObjectOrderStrategy
Enumerator
BBOX_CENTER
Do the sorting based on the center of the object bounding box.
See Also:
setSortedObjectOrderStrategy().
Since:
Coin 2.5
BBOX_FARTHEST_CORNER
Do the sorting based on the bounding box corner farthest from the camera.
See Also:
setSortedObjectOrderStrategy().
Since:
Coin 2.5
CUSTOM_CALLBACK
Use a custom callback to determine the sorting order.
See Also:
setSortedObjectOrderStrategy().
Since:
Coin 2.5
Constructor & Destructor Documentation
SoGLRenderAction::SoGLRenderAction (const SbViewportRegion &viewportregion)
Constructor. Sets up the render action for rendering within the given viewportregion.
SoGLRenderAction::~SoGLRenderAction (void) [virtual]
Destructor.
Member Function Documentation
SoType SoGLRenderAction::getTypeId (void) const [virtual]
Returns the type identification of an action derived from a class inheriting SoAction.
This is used for run-time type checking and 'downward' casting.
Usage example:
void bar(SoAction * action)
{
if (action->getTypeId() == SoGLRenderAction::getClassTypeId()) {
// safe downward cast, know the type
SoGLRenderAction * glrender = (SoGLRenderAction *)action;
}
return; // ignore if not renderaction
}
For application programmers wanting to extend the library with new actions: 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 Inventor/nodes/SoSubAction.h: SO_ACTION_SOURCE,
SO_ACTION_INIT_CLASS and SO_ACTION_CONSTRUCTOR.
For more information on writing Coin extensions, see the SoAction class documentation.
Returns the actual type id of an object derived from a class inheriting SoAction. Needs to
be overridden in all subclasses.
Implements SoAction.
Reimplemented in SoBoxHighlightRenderAction, and SoLineHighlightRenderAction.
void SoGLRenderAction::addMethod (const SoTypetype, SoActionMethodmethod) [static]
This API member is considered internal to the library, as it is not likely to be of
interest to the application programmer.
void SoGLRenderAction::enableElement (const SoTypetype, const intstackindex) [static]
This API member is considered internal to the library, as it is not likely to be of
interest to the application programmer.
const SoEnabledElementsList & SoGLRenderAction::getEnabledElements (void) const [protected],
[virtual]
Returns a list of the elements used by action instances of this class upon traversal
operations.
Reimplemented from SoAction.
Reimplemented in SoBoxHighlightRenderAction, and SoLineHighlightRenderAction.
void SoGLRenderAction::setViewportRegion (const SbViewportRegion &newregion)
Sets the viewport region for rendering. This will then override the region passed in with
the constructor.
const SbViewportRegion & SoGLRenderAction::getViewportRegion (void) const
Returns the viewport region for the rendering action.
void SoGLRenderAction::setUpdateArea (const SbVec2f &origin, const SbVec2f &size)
Sets the area of the OpenGL context canvas we should render into.
The coordinates for origin and size should be normalized to be within [0.0, 1.0]. The
default settings are <0.0, 0.0> for the origin and <1.0, 1.0> for the size, using the full
size of the rendering canvas.
void SoGLRenderAction::getUpdateArea (SbVec2f &origin, SbVec2f &size) const
Returns information about the area of the rendering context window to be updated.
void SoGLRenderAction::setAbortCallback (SoGLRenderAbortCB *constfunc, void *constuserdata)
Sets the abort callback. The abort callback is called by the action for each node during
traversal to check for abort conditions.
The callback method should return one of the SoGLRenderAction::AbortCode enum values to
indicate how the action should proceed further.
Since the client SoGLRenderAbortCB callback function only has a single void* argument for
the userdata, one has to do some additional work to find out which node the callback was
made for. One can do this by for instance passing along the action pointer as userdata,
and then call the SoGLRenderAction::getCurPath() method. The tail of the path will then be
the last traversed node. Like this:
// set up so we can abort or otherwise intervene with the render
// traversal:
myRenderAction->setAbortCallback(MyRenderCallback, myRenderAction);
// [...]
SoGLRenderAction::AbortCode
MyRenderCallback(void * userdata)
{
SoGLRenderAction * action = (SoGLRenderAction *)userdata;
SoNode * lastnode = action->getCurPath()->getTail();
// [...]
return SoGLRenderAction::CONTINUE;
}
See Also:
SoGLRenderAction::AbortCode
void SoGLRenderAction::getAbortCallback (SoGLRenderAbortCB *&func_out, void *&userdata_out)
const
Returns the abort callback settings.
See Also:
setAbortCallback
Since:
Coin 3.0
void SoGLRenderAction::setTransparencyType (const TransparencyTypetype)
Sets the transparency rendering method for transparent objects in the scene graph.
See Also:
SoGLRenderAction::TransparencyType
SoGLRenderAction::TransparencyType SoGLRenderAction::getTransparencyType (void) const
Returns the transparency rendering type.
void SoGLRenderAction::setTransparentDelayedObjectRenderType
(TransparentDelayedObjectRenderTypetype)
Sets the render type of delayed or sorted transparent objects. Default is ONE_PASS.
Since:
Coin 3.0
SoGLRenderAction::TransparentDelayedObjectRenderType
SoGLRenderAction::getTransparentDelayedObjectRenderType (void) const
Returns the render type of delayed or sorted transparent objects.
Since:
Coin 3.0
void SoGLRenderAction::setSmoothing (const SbBoolsmooth)
Sets (or unsets) smoothing. If the smoothing flag is on, Coin will try to use built-in
features from the OpenGL implementation to smooth the appearance of otherwise jagged line
and point primitives, calling
glEnable(GL_POINT_SMOOTH);
glEnable(GL_LINE_SMOOTH);
...before rendering the scene.
This is a simple (and computationally non-intensive) way of doing anti-aliasing.
Default value for this flag is to be off.
SbBool SoGLRenderAction::isSmoothing (void) const
Returns whether smoothing is set or not.
void SoGLRenderAction::setNumPasses (const intnum)
Sets the number of rendering passes. Default is 1, anything greater will enable
antialiasing through the use of an OpenGL accumulation buffer.
int SoGLRenderAction::getNumPasses (void) const
Returns the number of rendering passes done on updates.
void SoGLRenderAction::setPassUpdate (const SbBoolflag)
Sets whether each pass should render to screen or not.
SbBool SoGLRenderAction::isPassUpdate (void) const
Returns the value of the 'show intermediate updates' flag.
See Also:
setPassUpdate()
void SoGLRenderAction::setPassCallback (SoGLRenderPassCB *constfunc, void *constuserdata)
Sets the pass callback. The callback is called between each rendering pass.
void SoGLRenderAction::setCacheContext (const uint32_tcontext)
Sets the OpenGL cache context key, which is used for deciding when to share OpenGL display
lists.
Each SoGLRenderAction has a cache context id. This can be set using
SoGLRenderAction::setCacheContext(). The cache context id must be unique, so that
different texture objects and display lists are created for uncompatible GL contexts. For
instance, when SoGLRenderAction traverses an SoTexture2 node, the node checks if it has a
texture object created for the cache context. If not, a new texture object will be created
and used when rendering.
See Also:
SoGLCacheContextElement::getUniqueCacheContext()
uint32_t SoGLRenderAction::getCacheContext (void) const
Returns the cache context key for this rendering action instance.
void SoGLRenderAction::addDelayedPath (SoPath *path)
Adds a path to the list of paths to render after the current pass.
SbBool SoGLRenderAction::isRenderingDelayedPaths (void) const
Returns a flag indicating whether or not we are currently rendering from the list of
delayed paths of the scene graph.
SbBool SoGLRenderAction::handleTransparency (SbBoolistransparent = FALSE)
Used by shape nodes or others which need to know whether or not they should immediately
render themselves or if they should wait until the next pass. It also enables/disabled
blending based on the istransparent parameter.
If you're using an SoCallback or a non-shape node to render your geometry, you can use
this function to make sure your node is only rendered once. This function consider the
istransparent parameter, and when TRUE it will return TRUE on the first pass, and FALSE on
the second pass. For non-transparent objects it returns FALSE on the first pass, TRUE on
the second.
Please note that this function considers the current transparency type when deciding what
to do. It will delay rendering only when the transparency type is DELAYED_* or
SORTED_OBJECT_*. For other transparency types, transparent objects are rendered in the
same pass as opaque objects.
void SoGLRenderAction::setCurPass (const intpassnum, const intnumpasses)
Sets the current rendering pass to passnum. This can be used when antialiasing is
controlled from outside the SoGLRenderAction instance. numpasses is the total number of
rendering passes to be used.
Please note that this will disable any antialiasing set using the setNumPasses() method.
You can reenable the internal antialiasing again by calling setNumPasses()
Since:
Coin 3.1
int SoGLRenderAction::getCurPass (void) const
Returns the number of the current rendering pass.
SbBool SoGLRenderAction::abortNow (void)
Returns TRUE if the render action should abort now based on user callback.
See Also:
setAbortCallback()
void SoGLRenderAction::setRenderingIsRemote (SbBoolisremote)
Let SoGLRenderAction instance know if application is running on the local machine or if
the rendering instructions are sent over the network.
The flag is used to optimize rendering. For instance should the displaylist caching
strategy be influenced by this flag to be more aggressive with the caching when rendering
instructions are passed over the network.
Default value is FALSE. The value of the flag will not be changed internally from the Coin
library code, as it is meant to be controlled from client code -- typically from the SoQt
/ SoXt / SoWin / SoGtk libraries.
See Also:
getRenderingIsRemote()
SbBool SoGLRenderAction::getRenderingIsRemote (void) const
Returns whether or not the application is running remotely.
See Also:
setRenderingIsRemote()
void SoGLRenderAction::invalidateState (void) [virtual]
Invalidates the state, forcing it to be recreated at the next apply() invocation.
Reimplemented from SoAction.
void SoGLRenderAction::addPreRenderCallback (SoGLPreRenderCB *func, void *userdata)
Adds a callback which is invoked right before the scene graph traversal starts. All
necessary GL initialization is then done (e.g. the viewport is correctly set), and this
callback can be useful to, for instance, clear the viewport before rendering, or draw a
bitmap in the background before rendering etc.
The callback is only invoked once (before the first rendering pass) when multi pass
rendering is enabled.
Please note that SoSceneManager usually adds a callback to clear the GL buffers in
SoSceneManager::render(). So, if you plan to for instance draw an image in the color
buffer using this callback, you should make sure that the scene manager doesn't clear the
buffer. This can be done either by calling SoSceneManager::render() with both arguments
FALSE, or, if you're using one of our GUI toolkits (SoXt/SoQt/SoGtk/SoWin), call
setClearBeforeRender() on the viewer.
This method is an extension versus the Open Inventor API.
See Also:
removePreRenderCallback().
void SoGLRenderAction::removePreRenderCallback (SoGLPreRenderCB *func, void *userdata)
Removed a callback added with the addPreRenderCallback() method.
This method is an extension versus the Open Inventor API.
See Also:
addPreRenderCallback()
void SoGLRenderAction::setSortedLayersNumPasses (intnum)
Sets the number of passes to render in SoGLRenderAction::SORTED_LAYERS_BLEND mode. Default
number of passes is 4. This number can also be adjusted by setting the
COIN_NUM_SORTED_LAYERS_PASSES or OIV_NUM_SORTED_LAYERS_PASSES environment variable.
int SoGLRenderAction::getSortedLayersNumPasses (void) const
Returns the number of passes to render when in SoGLRenderAction::SORTED_LAYERS_BLEND mode.
void SoGLRenderAction::setSortedObjectOrderStrategy (const SortedObjectOrderStrategystrategy,
SoGLSortedObjectOrderCB *cb = NULL, void *closure = NULL)
Sets the strategy used for sorting transparent objects.
The CUSTOM_CALLBACK strategy enables the user to supply a callback which is called for
each transparent shape. This strategy can be used if the built in sorting strategies
aren't sufficient.
The callback should return a floating point value to be used when sorting the objects in
Coin. This floating point value is interpreted as a distance to the camera, and objects
with higher values will be sorted behind objects with lower values.
The callback will supply the SoGLRenderAction instance, and the path to the current object
can be found using SoAction::getCurPath().
Since:
Coin 2.5
void SoGLRenderAction::setDelayedObjDepthWrite (SbBoolwrite)
Set whether depth buffer updates should be done when rendering delayed or sorted
transparent objects.
Since:
Coin 3.0
SbBool SoGLRenderAction::getDelayedObjDepthWrite (void) const
Return whether depth buffer updates should be done when rendering delayed or sorted
transparent objects. Default is FALSE.
Since:
Coin 3.0
SbBool SoGLRenderAction::isRenderingTranspPaths (void) const
Returns TRUE if the action is currently rendering delayed or sorted transparent objects.
Since:
Coin 3.0
SbBool SoGLRenderAction::isRenderingTranspBackfaces (void) const
Returns TRUE if the action is currently rendering backfacing polygons in
NONSOLID_SEPARATE_BACKFACE_PASS mode.
Since:
Coin 3.0
void SoGLRenderAction::beginTraversal (SoNode *node) [protected], [virtual]
This virtual method is called from SoAction::apply(), and is the entry point for the
actual scenegraph traversal.
It can be overridden to initialize the action at traversal start, for specific
initializations in the action subclasses inheriting SoAction.
Default method just calls traverse(), which any overridden implementation of the method
must do too (or call SoAction::beginTraversal()) to trigger the scenegraph traversal.
Reimplemented from SoAction.
void SoGLRenderAction::endTraversal (SoNode *node) [protected], [virtual]
This virtual method can be overridden to execute code after the scene graph traversal.
Default method does nothing.
Reimplemented from SoAction.
Author
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