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SoVolumeRenderopacityThreshold Property

Specifies a threshold opacity (alpha) value that defines voxels considered to be "solid" (non-transparent).

Namespace: OIV.VolumeViz.Nodes
Assembly: OIV.VolumeViz (in OIV.VolumeViz.dll) Version: 10.12.3.0 (10.12.3.0)
Syntax
public SoSFFloat opacityThreshold { get; }

Property Value

Type: SoSFFloat
Remarks

Many volume data sets are composed of objects of interest floating in an approximately transparent "fog", depending on opacity values in the transfer function. Several effects like BOUNDARY_ALIGNED sampling, ambientOcclusion and deferredLighting need to locate the boundary between solid objects and ambient fog. This field defines a threshold in the range [0, 1]. Voxels are considered solid if their alpha value is greater than opacityThreshold.

A value of 0.0 generally works well with a transfer function containing "binary" opacity (a transfer function with only fully transparent or fully opaque colors). If this is not the case, you should set this value according to your visualization parameters. Generally between 0.1 and 0.5.

Default is 0.1, Ignore low visibility voxels.

Note Note

Field available since Open Inventor 9.3

See Also