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How do I render out only the shadow, without the grid included?

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YH
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I'm doing a Lighting shot with a real template, but I needed to cast the shadow on the table. So I used a to get the shadow.

So my problem now is that I'm able to get the shadow but unable to remove the grid while keeping the shadow. So I decided to try rendering out the indirect & direct shadow layers. But I've no idea on how to comp it into black colour in Nuke.

Any help is appreciated. Thanks.
Edited by YH - Nov. 5, 2016 10:19:54

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RP17.jpg (213.5 KB)
RP16.jpg (266.3 KB)
RP18.jpg (193.7 KB)

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sepu
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Invert your shadow pass in Nuke then multiply
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YH
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sepu
Invert your shadow pass in Nuke then multiply

Thank you so much for the answer. Saved me lots of time.
Edited by YH - Nov. 5, 2016 13:01:21

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