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SoOffscreenVolumeRenderdataSpaceMatrix Property

This transformation is applied on the volume render texture coordinate during the extraction.

Namespace: OIV.VolumeViz.Nodes
Assembly: OIV.VolumeViz (in OIV.VolumeViz.dll) Version: 2023.1.3.0 (2023.1.3)
Syntax
Copy
public SoSFMatrix dataSpaceMatrix { get; }

Property Value

Type: SoSFMatrix
Remarks

It allows to change the extraction frame. This matrix is applied on normalized texture coordinates all components are between 0-1 and must be in [0-1] after the transformation. So to inverse an axis, we must apply the following transformation: -1*u+1 (where u is a texture coordinate) and not just a simple negative scale.

To swap I and J axis, the matrix would be:

Copy
SbMatrix( 0, 1, 0, 0,
         1, 0, 0, 0,
         0, 0, 1, 0,
         0, 0, 0, 1);

To reverse I axis, the matrix would be:

Copy
SbMatrix(-1, 0, 0, 0,
         0, 1, 0, 0,
         0, 0, 1, 0,
         1, 0, 0, 1);

To reverse J axis, the matrix would be:

Copy
SbMatrix( 1, 0, 0, 0,
         0,-1, 0, 0,
         0, 0, 1, 0,
         0, 1, 0, 1);

To reverse K axis, the matrix would be:

Copy
SbMatrix( 1, 0, 0, 0,
         0, 1, 0, 0,
         0, 0, -1, 0,
         0, 0, 1, 1);

See Also