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StreamLineRepresentation: Fix z-ordering

Jaswant Panchumarti (Kitware) requested to merge jaswant.panchumarti/paraview:fix-streamlines-representation-z-order into master
  • The vtkStreamLinesMapper is now aware of VTK render passes.
  • This mapper has also been adapted to write the depth values into depth attachment.
  • It also reports that translucent geometry exists as well as opaque geometry.
  • By doing so, the VTK renderer will run a dual depth peeling pass on the fragment shader outputs which fix z-ordering artifacts with multiple translucent/opaque geometry.
  • Adds a new unit test to verify streamlines are correctly rendered when there are multiple objects in the scene.
Edited by Jaswant Panchumarti (Kitware)

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