Quote - Does anyone know if you can use the shadow catcher in reality? The shadow catcher is created in the shadermixer tab in daz and applied to a plane to make it look like the character belongs in a background image. Here is a sample:

I've wondered this myself from time to time, but if you're going to supplement your background in post, why not just run your figure with a blank plane beneath and run the alpha channel? It's pretty easy to also 'change color ___ to alpha' in your graphic editor of choice to get rid of the blank plane ;-) 

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