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Performance optimization for vtkDepthPeelingPass.

Allison Vacanti requested to merge allisonvacanti/vtk:depth-peeling-optimization into master

Rather than destroy/recreate TranslucentZTexture each frame and transfer a 0.f filled buffer from system --> GPU memory, reuse the texture and render a glClearBuffer call into it.

Benchmarks show a 10% (38 --> 42 FPS) improvement on release builds, and a 21% (33 --> 40 FPS) improvement on debugging builds.

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