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Post Closed as "Duplicate" by J Sargent, X-27 is done with the network, gandalf3, David, iKlsR

How to make a model cast shadows onto the world texture/background?
Render transperent shadows in cycles?

occurred May 7, 2015 at 16:27

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edited Apr 30, 2015 at 18:47

jagoji3d

Cycles: compositing object and shadows onlyalpha channel

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asked Apr 30, 2015 at 18:28

jagoji3d

Cycles: compositing object and shadows only

I have rendered an object using hdri and lamp lights. Using render layers i want to have object and shadows only. I show you my nodes. I need to know how to transform white pixels to alpha channel using nodes. enter image description here

cycles-render-engine compositing-nodes