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I'm using blender to render sprites for a game. I have a character mesh, and a T-Shirt mesh, rendered with a transparent background. enter image description here

I want to render the T-Shirt without the character, disabling the character I get this: enter image description here

How to make the polygons that were hidden by the character transparent?

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Set the pass index of the shirt to 1 (material tab>settings>pass index). Enable material index for the render layer (render layers tab>passes>material index). Go into the compositor (top bar where it says default, change it to compositing). Select use nodes and set up this node setup:enter image description here

For the top image input on the Alpha Over node set A: to 0.

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  • $\begingroup$ Thank you very much for this detailed answer, that's exactly what I'm looking for $\endgroup$ – uzul Nov 12 '17 at 2:20
  • $\begingroup$ I'm trying to make the same operation as described here... All is fine, the only problem I'm having is that I can't get rid of the white background. $\endgroup$ – Outandil Jun 11 '18 at 9:01
  • $\begingroup$ @Outandil See blender.stackexchange.com/q/1303/12 $\endgroup$ – iKlsR Jun 11 '18 at 13:12

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