In max how can I cast shadows onto a totally transparent object?
I have a photo, into this photo a model will go, and I want to render the shadows being cast by that item, but I just want to have the shadows, not any type of 'floor' as I need the shadows to overly onto the background.
I thought I could cast shadows onto a transparent box or plane, but they dont show up as the box/plane isnt dense enough.
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