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Change default ClippedVoxelIntensity in vtkVolumeProperty

Andras Lasso requested to merge lassoan/vtk:default-clipped-voxel-intensity into master

Default ClippedVoxelIntensity was set to (-1e27), which made clipped volume rendering planes appear too dark and not smooth (probably due to numerical instabilities caused by the extremely large value). If voxel intensity is in (-1e15, 1e15) range then clipped planes look correct, if less than -1e16 or more than 1e16 then they look incorrect.

Use -1e10 as default ClippedVoxelIntensity value to get correct clipped plane appearance by default.

See example rendering results with different ClippedVoxelIntensity values:

ClippedVoxelIntensity

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