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extracting shadow from objects that have hair

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Steve Bentley
extracting shadow from objects that have hair
on Oct 28, 2019 at 8:26:30 pm

I've tried all the tricks I know. I need to get the shadow that falls on the head from the hair as a separate element.
I've got a shadow catcher on the head (used correctly unlike the users manual). I do get the shadow but I also get the hair. I've tried compositing tags on the hair, also turning off the post processes in the render (hair is a post process right?), also tried a multi channel render.
The closest I've gotten is coloring the head with greenscreen green, using a shadow catcher and then I only get green where the shadow is and I can key the shadow. But I'd rather have a head only that shows in the alpha but only where the shadows fall.
Is this a no go due to hair being a post process?

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