Maya2011: Rendering Shadow-Channel of hidden object

Tried this for hours yesterday and it’s driving me crazy. the shadow channel always produces a black image with a pure 100%-alpha channel and no shadow anywhere.

I did "hide" a simple cube, put a spot-light somewhere and placed a flat primitive below as a floor.
The beauty channel is fine.


scene with object visible


scene with object: display / hide / hide selected object


shadow pass settings

any suggestions? 🙂

Thanks in advance

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