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Make SSAO intensity configurable

Andras Lasso requested to merge lassoan/vtk:add-ssao-intensity-scale into master

The default darkening caused by SSAO-generated shadows is sometimes too strong, sometimes insufficient. This commit adds IntensityScale property to vtkSSAOPass to allow making shadows darker or lighter.

See related discussion at https://discourse.slicer.org/t/improve-ambient-occlusion-in-volume-rendering/33590/6

Co-authored-by: Lucas Gandel lucas.gandel@kitware.com

The feature was originally proposed in this draft commit: LucasGandelKitware/vtk@4639dd97

Edited by Andras Lasso

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