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vtkCompositePolyDataMapper: Fix per-block opacity override when using translucent actor

Jaswant Panchumarti (Kitware) requested to merge jaswant.panchumarti/vtk:fix-composite-mapper-opaque-blocks into master
  • address paraview/paraview#22605 (closed)
  • fixes a bug that happened when using the composite polydata mapper with per-block overriden opacities. When the actor was made transparent, and a block's opacity was overriden to 1.0, that block was never rendered, because the renderer inferred from the actor that there was no need to render opaque geometry.
  • this commit also adds a unit test that cycles opacity for individual blocks of a translucent actor and verifies the rendered image is correct.
Edited by Jaswant Panchumarti (Kitware)

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