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Add tone mapping to render view

Michael Migliore requested to merge michael.migliore/paraview:tone-mapping into master

A new option is available in render view property to enable HDR rendering and tone mapping pass.
When enabled, rendering is done on a half-float framebuffer in order to support colors going beyond 1.0 value.

Three tone mapping algorithms are availables:

  • Clamp: clamps luminance to [0;1] range.
  • Reinhard, luminance function: y = x / (1 + x).
  • Exponential, luminance function: y = 1 - exp(-x*a), a is an exposure coefficient.

VTK is updated because vtk/vtk!4346 (merged) is needed.

Edited by Michael Migliore

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