SoVolumeGroup Class Reference

VolumeViz Groups multiple volumes to be volume rendered in the same scene. More...

#include <VolumeViz/nodes/SoVolumeGroup.h>

Inheritance diagram for SoVolumeGroup:
SoSeparator SoGroup SoNode SoFieldContainer SoBase SoRefCounter SoTypedObject

List of all members.


struct  VGSlice
struct  VRInfo

Public Member Functions

virtual SoType getTypeId () const
 SoVolumeGroup ()

Static Public Member Functions

static SoType getClassTypeId ()

Public Attributes

SoSFBool multiVolumes

Detailed Description

VolumeViz Groups multiple volumes to be volume rendered in the same scene.

The SoVolumeGroup node allows multiple volumes to be volume rendered (SoVolumeRender) correctly in the same scene. All SoVolumeRender nodes that are under an active SoVolumeGroup node (multiVolumes=TRUE) are rendered together with correct blending, subject to some limitations. Other VolumeViz geometry objects, for example SoOrthoSlice, are not affected by SoVolumeGroup.

The SoVolumeRender nodes can represent different volume data sets (see SoVolumeData) or different subvolumes (see SoROI) of the same volume data set.

This node forces the use of view-aligned slices for SoVolumeRender nodes that will be composed. It doesn't, however, actually modify the SoVolumeRender::samplingAlignment fields. Rather the values of these fields are ignored during traversal.

The multiVolumes field (TRUE by default) controls whether the SoVolumeGroup's special handling of SoVolumeRender nodes is applied. If the (sub)volumes being rendered do not overlap in 3D space or only one of the volumes is transparent, then SoVolumeGroup special handling is automatically disabled.

SoVolumeGroup is primarily intended for cases where the volumes are sampled on different grids. For example if the volume dimension, size (3D extent) or orientation are different. For volumes that are actually multiple data sets sampled on the same grid, for example seismic attribute volumes, it may be more appropriate to blend the volumes using an SoDataCompositor or SoVolumeShader node.

Since OIV 9.3, EdgeDetection (Gradient, Luminance, Depth) and LowResMode (DECREASE_SCREEN_RESOLUTION) effects are supported. These post process effects need to be applied to all or none of the volumes. If all fields corresponding to an effect are the same for each volume, the effect is activated. If fields are different then default value is used.





SoVolumeRender, SoSeparator, SoDataCompositor, SoVolumeShader

See related examples:

MedicalMultiVolumes, MultiVolumes, VolRend

Constructor & Destructor Documentation

SoVolumeGroup::SoVolumeGroup (  ) 


Member Function Documentation

static SoType SoVolumeGroup::getClassTypeId (  )  [static]

Returns the type identifier for this class.

Reimplemented from SoSeparator.

virtual SoType SoVolumeGroup::getTypeId (  )  const [virtual]

Returns the type identifier for this specific instance.

Reimplemented from SoSeparator.

Member Data Documentation

Activates the multi-volumes feature.

Default is TRUE. If set to FALSE, behaves as a regular SoGroup.

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

Open Inventor Toolkit reference manual, generated on 12 Sep 2022
Copyright © Thermo Fisher Scientific All rights reserved.