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Isolating Shadows with pyro objects


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So I have a pyro object, a light casting depth map shadows, and a grid I want to cast shadows onto. The goal is to isolate the cast shadows in a render. I was thinking the workflow would simply be:

1. apply Shadow Matte to grid and render.

2. render out smoke alpha (Asmoke) and use that as a matte to occlude the smoke from the shadow matte render.

Sounds simple enough but I'm having issues with my grid coming out completely white when I have shadow amount set to 1. I figured it was being caused by the light so I disabled it in the grid's light mask but I'm still having issues. Could someone shed some light on the situation? A bare bones example of a light, pyro object, and a grid would be more than enough to wrap my head around this. Thanks.

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