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Trace Image Plane to get Shadow Geo


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I have an image sequence with an alpha and a tracked animated camera. I need to create some shadows on geo from it. My plan is to create some basic geo from the alpha

Tracing & extruding to create some rough geo to cast shadows good enough for my purposes is no problem, however how do you project the trace node's results out from the camera?

Ideally, I'd have the trace output match the camera frustum and all I'd need to do is animate the z-depth of the trace plane away from the camera to roughly match the plate I'm trying to fake shadows for.

How on earth do I go about this? Thanks!

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