Troubleshoot volumetric fog with depth map shadows

If the fog appears with streaks, or the entire effect disappears from your scene when rendering in mental ray for Maya, you can use one of the following solutions.

Solution 1

Use ray traced shadows instead of depth map shadows. See Render raytraced shadows.

Solution 2

1. In the Attribute Editor for the volume primitive shape node, turn on Volume Samples Override.
2. Set the Volume Samples value to 5, or greater (between 5 - 20 is recommended). (You may need to tune this setting repeatedly, until you achieve a good result.)
3. Turn on Depth Jitter.
4. Render your scene.