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Volume Fog - Ray Tracing Shadows

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Ross Littlejohn
Volume Fog - Ray Tracing Shadows
on May 1, 2013 at 8:39:10 pm

Hi, I'm currently working on a college project, the idea is an abandoned asylum and I'm using volumetric fog to create a darker atmosphere.

My issue is that the environment will be presented as though someone is exploring with a flashlight, so shadows are a going to play a huge factor in how the scene looks. The problem is that when I turn my spotlight on to use Ray Trace shadows, It also affects the volumetric fog, which gives it a horrible noisy look to it - At least I think that is what is happening, it's the only change I make when I try to render.

Is there a way to disable ray tracing for the volume fog?

I've taken a couple of pictures to demonstrate my issue.

With ray trace disabled on the spot light:
(This is more or less what I want)

With ray trace enabled on the spot light:
(shadows seem to emit from the volume noise)

Any help would be great.

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