SoQtRenderArea Class Reference
[Qt]
Component for rendering Open Inventor scene graphs.
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#include <Inventor/Qt/SoQtRenderArea.h>
Detailed Description
Component for rendering Open Inventor scene graphs.
This class provides Open Inventor rendering and event handling inside a QT widget. There is a routine to specify the scene to render. The scene is automatically rendered whenever anything under it changes (a data sensor is attached to the root of the scene), unless explicitly told not to do so (manual redraws). Users can also set Open Inventor rendering attributes such as the transparency algorithm, antialiasing on or off, etc. This class employs an SoSceneManager to manage rendering and event handling.
Q events that occur in the render area can be handled by the application, by the viewer (if this is really a viewer), or by the nodes in the scene graph. When a event occurs, it is first passed to the application event callback function registered with the setEventCallback() method on SoQtRenderArea. If this function does not exist or returns FALSE, the Q event is either used directly by the viewer or translated to an SoEvent for further scene graph processing. If the viewer does not handle the event, and an overlay scene graph exists, the SoEvent is sent to that scene graph by way of an SoHandleEventAction. If no node in the overlay scene graph handles the event (i.e., calls setHandled() on the SoHandleEventAction), the SoEvent is passed to the normal scene graph in the same manner.
NOTES
Overlay rendering:
This class supports overlay rendering on graphics boards with hardware overlay planes, for example NVIDIA Quadro boards. Open Inventor creates a 8 bit indexed overlay context when this option is enabled in the graphics hardware configuration of your system. To render a scene graph in the overlay context just call the setOverlaySceneGraph function.
For Linux based systems you must modify the section display of your Xorg.conf. Add the following lines and restart your X server:
Option "UBB" "1" Option "CIOverlay" "1"
For Microsoft Windows platforms just enable overlay support in the control panel for your graphics board.
RESOURCES
*SoQtRenderArea*BackgroundColor: black (color name or hex value)
SEE ALSO
SoQtGLWidget, SoQtComponent, SoQtViewer, SoSceneManager, SoBoxHighlightRenderAction, SoLineHighlightRenderAction
- See related examples:
Constructor & Destructor Documentation
| SoQtRenderArea::SoQtRenderArea | ( | QWidget * | parent = NULL, |
|
| const char * | name = NULL, |
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| SbBool | buildInsideParent = TRUE, |
|||
| SbBool | getMouseInput = TRUE, |
|||
| SbBool | getKeyboardInput = TRUE | |||
| ) |
Constructor which is passed arguments which tell it whether to register the mouse and keyboard devices by default (SoQtMouse and SoQtKeyboard).
| SoQtRenderArea::~SoQtRenderArea | ( | ) |
Destructor.
Member Function Documentation
| SoDEPRECATED void SoQtRenderArea::getAntialiasing | ( | SbBool & | smoothing, | |
| int & | numPasses | |||
| ) | const |
Gets the antialiasing used for rendering.
- Deprecated:
-
Deprecated since Open Inventor 9100
Use method getAntialiasingParameters() to get this information.
| const SbColor& SoQtRenderArea::getBackgroundColor | ( | ) | const [inline] |
Gets the background color for this window.
| int SoQtRenderArea::getBackgroundIndex | ( | ) | const [inline] |
Gets the window background color when in color index mode.
| static uint32_t SoQtRenderArea::getDefaultRedrawPriority | ( | ) | [inline, static] |
Gets the default priority number of the redraw sensor.
| SoGLRenderAction::FastEditSavePolicy SoQtRenderArea::getFastEditSavePolicy | ( | ) | const [inline] |
Returns fast editing save policy used when rendering.
| void SoQtRenderArea::getFloatingColorBuffer | ( | SbBool & | enable, | |
| FloatColorBufferSize & | size | |||
| ) |
Returns TRUE if floating point rendering is used and its precision.
| SoGLRenderAction* SoQtRenderArea::getGLRenderAction | ( | ) | const [inline] |
Gets the GL render action to use.
This is used to set selection highlighting with the SoBoxHighlightRenderAction and SoLineHighlightRenderAction classes.
| SoGLRenderAction::InvalidateCacheMode SoQtRenderArea::getInvalidateCacheMode | ( | ) |
Returns the current cache invalidation mode.
| virtual SoMPEGRenderer* SoQtRenderArea::getMPEGRecorder | ( | ) | const [inline, virtual] |
Returns the recorder used for MPEG encoding.
| SoDEPRECATED int SoQtRenderArea::getOverlayBackgroundIndex | ( | ) | const [inline] |
Gets the overlay window background color index.
- Deprecated:
-
Deprecated since Open Inventor 9610
Overlay feature is legacy, and no longer makes sense with current hardware.
| SoDEPRECATED SoGLRenderAction* SoQtRenderArea::getOverlayGLRenderAction | ( | ) | const [inline] |
Gets the GL render action for the overlay window.
- Deprecated:
-
Deprecated since Open Inventor 9610
Overlay feature is legacy, and no longer makes sense with current hardware.
| SoDEPRECATED SoNode* SoQtRenderArea::getOverlaySceneGraph | ( | ) | [inline] |
Gets the scene graph to be rendered in the overlay plane.
NOTE: This feature requires a graphics board that supports an overlay plane.
- Deprecated:
-
Deprecated since Open Inventor 9610
Overlay feature is legacy, and no longer makes sense with current hardware.
| SoDEPRECATED SoSceneManager* SoQtRenderArea::getOverlaySceneManager | ( | ) | const [inline] |
Gets the overlay plane scene manager.
Note: For convenience most of the SoSceneManager methods have already been added to this class.
- Deprecated:
-
Deprecated since Open Inventor 9610
Overlay feature is legacy, and no longer makes sense with current hardware.
| SoQtRenderAreaRenderCB* SoQtRenderArea::getPostRenderCallback | ( | const void *& | userData | ) | const [inline] |
Gets the post-render callback function and data.
Returns NULL if no callback has been specified by the application.
| uint32_t SoQtRenderArea::getRedrawPriority | ( | ) | const [inline] |
Gets the priority of the redraw sensor.
| virtual SoNode* SoQtRenderArea::getSceneGraph | ( | ) | [virtual] |
Gets the scene graph to be rendered in this component's window.
Reimplemented in SoQtViewer.
| SoSceneManager* SoQtRenderArea::getSceneManager | ( | ) | const [inline] |
Gets the normal scene manager.
Note: For convenience most of the SoSceneManager methods have already been added to this class.
| const SbGLShareContext SoQtRenderArea::getShareContext | ( | ) |
Returns the information needed to make OpenGL render contexts share OpenGL objects, for example, display lists and texture objects.
Open Inventor automatically shares between on-screen contexts. This method is useful to share objects with an off-screen context. See SoOffscreenRenderer.
| int SoQtRenderArea::getSortedTrianglesNumCaches | ( | ) |
Returns the maximum number of caches allowed for the sorted triangles transparency types.
| int SoQtRenderArea::getSortedTrianglesSortFrequency | ( | ) |
Returns the sort frequency used for the SORTED_TRIANGLES_XXX and SORTED_OBJECT_TRIANGLES_XXX transparency types.
| SoGLRenderAction::TransparencyType SoQtRenderArea::getTransparencyType | ( | ) | const [inline] |
Gets the algorithm for rendering transparent objects.
See SoGLRenderAction for possible transparency types.
| const SbViewportRegion& SoQtRenderArea::getViewportRegion | ( | ) | const [inline] |
Gets current viewport region to use for rendering.
| SbBool SoQtRenderArea::isAutoRedraw | ( | ) | const [inline] |
Queries whether the render area will automatically redraw whenever something in the scene graph changes.
| SoDEPRECATED SbBool SoQtRenderArea::isClearBeforeOverlayRender | ( | ) | const [inline] |
Queries whether the overlay window will be cleared before rendering starts.
- Deprecated:
-
Deprecated since Open Inventor 9610
Overlay feature is legacy, and no longer makes sense with current hardware.
| SbBool SoQtRenderArea::isClearBeforeRender | ( | ) | const [inline] |
Queries whether the window will be cleared before rendering starts.
| SbBool SoQtRenderArea::isClearZBufferBeforeRender | ( | ) | const [inline] |
Queries whether the depth buffer (sometimes called the Z buffer) will be cleared before rendering starts.
| static SbBool SoQtRenderArea::isFloatingColorBufferSupported | ( | ) | [static] |
Returns TRUE if floating point rendering is available.
| void SoQtRenderArea::redrawOnSelectionChange | ( | SoSelection * | s | ) |
Call this convenience method to have this render area redraw whenever the selection list changes in the passed node.
This is useful if using a highlight render action like the SoBoxHighlightRenderAction to correctly render whenever the selection changes. Pass NULL to turn this off.
This call increases the ref counter of the given SoSelection node, it will be automatically decreased when the selection node is replaced by another one, or if it is turned off.
| SoDEPRECATED void SoQtRenderArea::redrawOverlayOnSelectionChange | ( | SoSelection * | s | ) |
Call this convenience method to have this render area overlay planes redraw whenever the selection list changes in the passed node.
This is useful if using a highlight render action like the SoBoxHighlightRenderAction to correctly render whenever the selection changes. Pass NULL to turn this off.
This call increases the ref counter of the given SoSelection node, it will be automatically decreased when the selection node is replaced by another one, or if it is turned off.
- Deprecated:
-
Deprecated since Open Inventor 9610
Overlay feature is legacy, and no longer makes sense with current hardware.
| void SoQtRenderArea::registerDevice | ( | SoQtDevice * | d | ) |
Registers interest in devices.
When a device is registered, messages from that device will be processed by the render area, and passed into the scene graph. Messages from unregistered devices will be ignored.
| void SoQtRenderArea::render | ( | ) | [inline] |
Calling this forces the render area to be redrawn now.
It is not necessary to call this method if auto redraw is enabled (which is the default).
| SoDEPRECATED void SoQtRenderArea::renderOverlay | ( | ) | [inline] |
Calling this forces the render area overlay planes to be redrawn now.
It is not necessary to call this method if auto redraw is enabled (which is the default).
- Deprecated:
-
Deprecated since Open Inventor 9610
Overlay feature is legacy, and no longer makes sense with current hardware.
| SoDEPRECATED void SoQtRenderArea::scheduleOverlayRedraw | ( | ) |
Schedules a redraw of the overlay planes to happen sometime soon (as opposed to immediately).
This can be used to compress multiple redraws.
- Deprecated:
-
Deprecated since Open Inventor 9610
Overlay feature is legacy, and no longer makes sense with current hardware.
| void SoQtRenderArea::scheduleRedraw | ( | ) |
Schedules a redraw to happen sometime soon (as opposed to immediately).
This can be used to compress multiple redraws.
| void SoQtRenderArea::sendEvent | ( | QEvent * | anEvent | ) |
Sends the event to be processed by the renderArea.
| SoDEPRECATED void SoQtRenderArea::setAntialiasing | ( | SbBool | smoothing, | |
| int | numPasses | |||
| ) |
Enables smoothing and/or multi-pass antialiasing for rendering.
There are two kinds of antialiasing available: smoothing and multipass antialiasing. If smoothing is set to TRUE, smoothing is enabled. Smoothing uses OpenGL's line- and point-smoothing features to provide cheap antialiasing of lines and points. The value of numPasses controls multipass antialiasing. Each time a render action is applied, Open Inventor renders the scene numPasses times from slightly different camera positions, averaging the results. numPasses can be from one to 255, inclusive. Setting numPasses to one disables multipass antialiasing. You can use either, both, or neither of these antialiasing techniques. By default, both smoothing and multipass antialiasing are disabled.
Caution: Multipass antialiasing is quite slow. We recommend using full-scene antialiasing, which is hardware accelerated on modern graphics hardware. See SoWinGLWidget::setFullSceneAntialiasing().
- Deprecated:
-
Deprecated since Open Inventor 9100
Use setAntialiasing(float,AntialiasingMode) with mode SUPERSAMPLING or setAntialiasing(SoAntialiasingParameters*) with an SoAccumulationAntialiasingParameters object.
| void SoQtRenderArea::setAutoRedraw | ( | SbBool | trueOrFalse | ) |
The render area will automatically redraw whenever something in the scene graph changes.
Passing FALSE will disable this feature. NOTE: the render area will always redraw in response to window system events (e.g. resize, exposure) regardless of the setting of the auto redraw flag.
| void SoQtRenderArea::setBackgroundColor | ( | const SbColor & | c | ) |
Sets the background color for this window.
Default is black (0,0,0).
The default value can be set using the environment variable OIV_BACKGROUND_COLOR. Specify three floats (R, G, B) in the range 0. to 1., separated by spaces.
| void SoQtRenderArea::setBackgroundIndex | ( | int | index | ) | [inline] |
Sets the window background color when in color index mode.
Default is black (index 0)).
| SoDEPRECATED void SoQtRenderArea::setClearBeforeOverlayRender | ( | SbBool | trueOrFalse | ) | [inline] |
Enables/prevents overlay window clearing from happening before a rendering starts (default is clear TRUE).
- Deprecated:
-
Deprecated since Open Inventor 9610
Overlay feature is legacy, and no longer makes sense with current hardware.
| void SoQtRenderArea::setClearBeforeRender | ( | SbBool | trueOrFalse, | |
| SbBool | zbTrueOrFalse = TRUE | |||
| ) | [inline] |
Enables/prevents window clearing from happening before a rendering starts (default is clear TRUE).
This can be useful to limit flickering when doing single buffering and geometry covers the entire window (used in the material editor). Also controls whether the depth buffer (sometimes called the Z buffer) is cleared before rendering.
| SoDEPRECATED void SoQtRenderArea::setColorMap | ( | int | startIndex, | |
| int | num, | |||
| const SbColor * | colors | |||
| ) |
- Deprecated:
-
Deprecated since Open Inventor 8000
Use setColorMap(QGLColormap*) instead.
| void SoQtRenderArea::setColorMap | ( | QGLColormap * | cmap | ) |
Sets the colors to use when displaying in color index mode.
This will load the color map with the given colors at the starting index.
| void SoQtRenderArea::setEventCallback | ( | SoQtRenderAreaEventCB * | fcn, | |
| void * | userData = NULL | |||
| ) |
Windows messages which occur in the render area window are either directly handled by the viewer (when this is really a viewer) or automatically translated to SoEvents, then passed into the scene graph (via the SoHandleEventAction) so that live scene graph objects can handle the message (when viewers are not in viewing mode).
This method allows the application to register a callback for handling messages that occur in the window, instead of sending them to the viewers or down the graph. The callback is passed the Windows message, and should return TRUE if it handled the message. If the callback returns FALSE, then the message will be handled by the render area.
| void SoQtRenderArea::setFastEditSavePolicy | ( | SoGLRenderAction::FastEditSavePolicy | policy, | |
| SbBool | fastEditDelayedObjects = FALSE | |||
| ) |
Sets fast editing save policy to use when rendering.
The default is WHEN_NEEDED. Valid values are DISABLE, EACH_FRAME, and WHEN_NEEDED. See SoSeparator.
If fastEditDelayedObjects is set to TRUE, delayed objects won't be redrawn when editing the scene graph. It means that composition between delayed transparent objects and the fast edit scene graph won't be correct but redrawing may be much faster. Default is false.
| void SoQtRenderArea::setFloatingColorBuffer | ( | SbBool | enable, | |
| FloatColorBufferSize | size = FLOAT_16_COLOR_BUFFER | |||
| ) |
Enables/disables floating point rendering using 16- or 32-bit components.
If TRUE, Open Inventor will automatically render to an offscreen floating point buffer, and copy the resulting image to the screen.
To determine if floating point rendering was successfully enabled, use getFloatingColorBuffer, below.
Using floating point rendering can improve image quality, particularly when many objects are being blended, for example, in volume rendering. This is a convenience method as you could accomplish the same results setting up a graphic template.
| void SoQtRenderArea::setGLRenderAction | ( | SoGLRenderAction * | ra | ) |
Sets the GL render action to use.
This is used for example to set selection highlighting with the SoBoxHighlightRenderAction and SoLineHighlightRenderAction classes. Note: Properties of the previous render action, for example transparency type, are not automatically copied to the new render action. The application must explicitly set the desired properties of the new render action.
| void SoQtRenderArea::setInvalidateCacheMode | ( | SoGLRenderAction::InvalidateCacheMode | icm | ) |
Enables or disables the invalidation of render caches.
- When set to ALWAYS, the caches are invalidated for each SoSeparator node before its children are traversed. No new caches will be built. This value forces all nodes to be visited during each render traversal.
- When set to ONCE, the caches are invalidated for each SoSeparator node before its children are traversed. The invalidate cache mode is automatically changed to OFF at the end of the traversal.
- When set to OFF (default), caches are managed by their respective render caching nodes in the usual way.
This method is useful to force all nodes to be visited during render traversal.
| virtual void SoQtRenderArea::setMPEGRecorder | ( | SoMPEGRenderer * | recorder | ) | [inline, virtual] |
Sets the recorder used for MPEG encoding.
- Parameters:
-
recorder the recorder to be used.
| SoDEPRECATED void SoQtRenderArea::setOverlayBackgroundIndex | ( | int | index | ) | [inline] |
Sets the overlay window background color index.
Default is 0 (clear color)).
- Deprecated:
-
Deprecated since Open Inventor 9610
Overlay feature is legacy, and no longer makes sense with current hardware.
| SoDEPRECATED void SoQtRenderArea::setOverlayColorMap | ( | int | startIndex, | |
| int | num, | |||
| const SbColor * | colors | |||
| ) |
- Deprecated:
-
Deprecated since Open Inventor 8000
Use setOverlayColorMap(QGLColormap*) instead.
| SoDEPRECATED void SoQtRenderArea::setOverlayColorMap | ( | QGLColormap * | cmap | ) |
Sets the colors to use for overlay bit planes.
This will load the color map with the given colors at the starting index.
- Deprecated:
-
Deprecated since Open Inventor 9610
Overlay feature is legacy, and no longer makes sense with current hardware.
| SoDEPRECATED void SoQtRenderArea::setOverlayGLRenderAction | ( | SoGLRenderAction * | ra | ) | [inline] |
Sets the GL render action for the overlay window.
- Deprecated:
-
Deprecated since Open Inventor 9610
Overlay feature is legacy, and no longer makes sense with current hardware.
| SoDEPRECATED void SoQtRenderArea::setOverlaySceneGraph | ( | SoNode * | newScene | ) |
Sets the scene graph to be rendered in the overlay plane.
NOTE: This feature requires a graphics board that supports an overlay plane.
- Deprecated:
-
Deprecated since Open Inventor 9610
Overlay feature is legacy, and no longer makes sense with current hardware.
| SoDEPRECATED void SoQtRenderArea::setOverlaySceneManager | ( | SoSceneManager * | sm | ) | [inline] |
Sets the overlay plane scene manager.
Note: For convenience most of the SoSceneManager methods have already been added to this class.
- Deprecated:
-
Deprecated since Open Inventor 9610
Overlay feature is legacy, and no longer makes sense with current hardware.
| void SoQtRenderArea::setPostRenderCallback | ( | SoQtRenderAreaRenderCB * | fcn, | |
| void * | userData = NULL | |||
| ) | [inline] |
Specifies a function to be called after the Open Inventor render traversal and immediately before the OpenGL buffer swap.
Generally the application should not modify Open Inventor state in these callbacks, but they can be useful for special effects using OpenGL calls.
When the callback function is called, Open Inventor has completed normal rendering (including delayed transparent objects, multi-pass, etc), but no "end of frame" calls (glFlush, glFinish, SwapBuffers...) have been made. The function should return TRUE if "end of frame" handling has been done by the application (Open Inventor will do nothing in this case). If FALSE is returned, Open Inventor will do its normal end of frame calls (normally calling SwapBuffers).
| void SoQtRenderArea::setRedrawPriority | ( | uint32_t | priority | ) | [inline] |
Sets the priority of the redraw sensor.
| virtual void SoQtRenderArea::setSceneGraph | ( | SoNode * | newScene | ) | [virtual] |
Sets the scene graph to be rendered in this component's window.
Reimplemented in SoQtViewer.
| void SoQtRenderArea::setSceneManager | ( | SoSceneManager * | sm | ) |
Sets the normal scene manager.
Note: For convenience most of the SoSceneManager methods have already been added to this class.
| void SoQtRenderArea::setSortedTrianglesNumCaches | ( | int | numCaches | ) |
Sets the number of caches to use when the transparency type is SORTED_TRIANGLES_XXX or SORTED_OBJECT_TRIANGLES_XXX.
This specifies the number of lists of sorted triangles to keep in memory in order to render transparent triangles more quickly.
When computing a new list of sorted triangles, if an empty cache is available, it is used. Else, the farthest axis from the camera orientation axis is replaced in the cache. The default number of caches is 3.
| void SoQtRenderArea::setSortedTrianglesSortFrequency | ( | int | angle | ) |
This method specifies the angle between each sorting axis when using the transparency type SORTED_TRIANGLES_XXX or SORTED_OBJECT_TRIANGLES_XXX.
Transparent triangles are sorted based on the nearest axis. (in terms of the dot (inner) product). If the triangles have already been sorted on this axis (or the opposite), and the sort result is cached, the triangles are rendered using the cached information.
The default value for sort frequency is 90, meaning that a sorting is made every 90 degrees. If the value is 0, sorting is always done and the camera orientation vector is the axis used for sorting. In this case, no cache is made.
See SoGLRenderAction for additional details and figures.
| void SoQtRenderArea::setTransparencyType | ( | SoGLRenderAction::TransparencyType | type | ) |
Sets the algorithm for rendering transparent objects.
Default is SCREEN_DOOR. See SoGLRenderAction for possible transparency types. See also the SoTransparencyType node.
Note: When using transparency types with DELAYED in the name, the depth buffer is not updated (depth buffer writes are disabled) while rendering transparent objects. As a result complex 3D shapes may not be rendered correctly.
| void SoQtRenderArea::setViewportRegion | ( | const SbViewportRegion & | newRegion | ) | [inline] |
Sets viewport region to use for rendering.
| void SoQtRenderArea::unregisterDevice | ( | SoQtDevice * | d | ) |
Unregisters interest in devices.
When a device is registered, messages from that device will be processed by the render area, and passed into the scene graph. Messages from unregistered devices will be ignored.
The documentation for this class was generated from the following file:
- Inventor/Qt/SoQtRenderArea.h