SoSeparator Class Reference

Group node that saves and restores traversal state. More...

#include <Inventor/nodes/SoSeparator.h>

Inheritance diagram for SoSeparator:
SoGroup SoNode SoFieldContainer SoBase SoRefCounter SoTypedObject PlaneGeometryIntersection Ruler SceneInteractor SceneView SoAnnotation SoBillboard SoLocateHighlight SoMultiDataSeparator SoRenderToTarget SoSelection SoVertexAttribFeedback SoVolumeGroup

List of all members.


struct  MTstruct

Public Types

enum  CacheEnabled {
enum  FastEditing {
  DISABLE = 0x01,
  KEEP_ZBUFFER = 0x02,

Public Member Functions

virtual SoType getTypeId () const
 SoSeparator ()
 SoSeparator (int nChildren)

Static Public Member Functions

static SoType getClassTypeId ()

Public Attributes

SoSFEnum boundingBoxCaching
SoSFEnum renderCulling
SoSFEnum pickCulling
SoSFEnum fastEditing
SoSFInt32 renderUnitId


SoDEPRECATED SoSFEnum renderCaching

Detailed Description

Group node that saves and restores traversal state.

This group node performs a push (save) of the traversal state before traversing its children and a pop (restore) after traversing them. This isolates the separator's children from the rest of the scene graph. A separator can include lights, cameras, coordinates, normals, bindings, and all other properties. Separators are relatively inexpensive (the push/pop operation is highly optimized), so they can be used freely within scenes.


The SoSeparator node provides caching of state during bounding box computation. This feature can be explicitly enabled or disabled by setting the boundingBoxCaching field. By default, this field is set to AUTO, which means that Open Inventor decides whether to build a cache based on internal heuristics.


Separators can also perform culling during rendering and picking. Culling skips over traversal of the separator's children if they are not going to be rendered or picked, based on the comparison of the separator's bounding box with the current view volume. Culling is controlled by the renderCulling and pickCulling fields. These are also set to AUTO by default; however, render culling can be expensive (and can interfere with render caching), so the AUTO heuristics leave it disabled unless specified otherwise. Note that if renderCulling is ON, the SoSeparator will prohibit auto-caching, so that no SoSeparator (or other render caching node) above this node in the scene graph will automatically create a render cache.

Fast edit:

The fast editing feature allows you to modify parts of a scene without redrawing the entire scene. For example, you could use it to interactively move a small object in a large scene that takes a long time to redraw. Fast editing must be enabled using SoGLRenderAction::setFastEditSavePolicy.

The fastEditing field enables fast editing for the sub-graph under the SoSeparator. Possible values are DISABLE, KEEP_ZBUFFER, and CLEAR_ZBUFFER. Using KEEP_ZBUFFER means that the fast edit geometry is depth buffered against the other objects in the scene, and using CLEAR_ZBUFFER means that the fast edit geometry will be drawn on top of the other objects of the scene. If several SoSeparators have the CLEAR_ZBUFFER flag set, they are drawn in the order in which they appear in the scene. The last separator in the scene will be topmost on the screen.

Fast edit performance:

Fast edit limitations:




SoSelection, SoTransformSeparator,

See related examples:

FastSelection, ViewportClipping

Member Enumeration Documentation

Possible values for caching.


Never build a cache.


Always try to build a cache.


Decide whether to cache based on some heuristic.

Fast editing policy enumeration values.


This SoSeparator node doesn't have Fast Edit behavior.


This SoSeparator node has a Fast Edit behavior and the children nodes are drawn considering the depth Buffer.


This SoSeparator node has a Fast Edit behavior and the children nodes are drawn after the depth Buffer has been cleared.

Constructor & Destructor Documentation

SoSeparator::SoSeparator (  ) 

Creates a separator node with default settings.

SoSeparator::SoSeparator ( int  nChildren  ) 

Constructor that takes approximate number of children.

Member Function Documentation

static SoType SoSeparator::getClassTypeId (  )  [static]
virtual SoType SoSeparator::getTypeId (  )  const [virtual]

Member Data Documentation

Whether to cache during bounding box traversal.

Use enum CacheEnabled. Default is AUTO.

Specifies the fast edit mode of the separator node.

Use enum FastEditing. Default is DISABLE.

NOTE: field available since Open Inventor 5.0

Whether to cull during picking traversal.

Use enum CacheEnabled. Default is AUTO.

Whether to cache during rendering traversal.

Use enum CacheEnabled. Default is AUTO.


Deprecated since Open Inventor 10300
This field is ignored. Render caching is set internally to ensure best performance.

Whether to cull during rendering traversal.

Use enum CacheEnabled. Default is AUTO.

Used during the ScaleViz depth compositing process, this field specifies which render unit (OIRU) will render the sub scene graph below this separator.

  • 0, the sub scene graph is rendered on the local machine.
  • > 0, the sub scene graph is rendered by the OIRU with the specified ID. If the specified renderUnitId is larger than the number of available render units, the sub scene graph is distributed to the specified render unit ID modulo the number of render units actually available. That is:

    RenderUnitUsed = ((renderUnitId-1)%(ActualNumberOfRenderUnits))+1
  • -1 (SO_RENDERUNITID_NONE), this separator is not assigned to any OIRU.

    NOTE: This is the default value, which means that by default the sub scene graph is *not* distributed to any node. In order to use depth compositing, you must modify renderUnitId from the default, otherwise nothing will be rendered.
  • -2 (SO_RENDERUNITID_INHERIT), this separator inherits its value from parent SoSeparator.
  • -3 (SO_RENDERUNITID_ALL), the sub scene graph is rendered by all OIRUs.
NOTE: field available since Open Inventor 6.1

The documentation for this class was generated from the following file:

Open Inventor Toolkit reference manual, generated on 16 Sep 2021
Copyright © Thermo Fisher Scientific All rights reserved.