Sets the size for sampling inside the volume. It should be small enough to capture the smallest feature in the volume (aka the Nyquist limit). If the size is too large, aliasing, bias or banding will appear. Smaller (and therefore more accurate) sizes will increase render times while larger sizes will render more quickly. 


Controls filtering of noisy velocities resulting in faster rendering of motion blur from physics simulations. The default value 0.001 should have little to no visual impact. Setting it to zero disables filtering entirely. 
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