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Optimize Big Volumetric Grids | trOptimizeVolumetrics – Helps render scenes with caches above 25 Million cells faster. This option requires additional grid memory during rendering, so you could disable it if you don't have enough RAM. If using Progressive rendering or there are a lot of Phoenix FD Simulators in the scene, and you want your render to start without a pre-pass, you might want to disable this option.
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