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Note that the GPU Shade Preview is not a replacement for rendering. In order to display in real - time, the preview ignores Displacement, as well as any volumetric texture mapping of the Fire or Smoke. There are also some limitations as to how it displays volumes when geometries intersect the sim, or are inside the grid.

Finally, all lights are treated as directional, so using dome lights, area lights or global illumination would produce different render results than the GPU Preview. If you need to iterate on the final look of the simulation with complex lighting setups, you should use V-Ray GPU IPR, or another interactive rendering solution.