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I have a 3D object that I want to render into separate diffuse, normal & AO maps for use as textures. I am using the View Layer Properties > Passes options to include these layers in the output render. However, the Diffuse > Color has black background, even if the Render Properties > Film > Transparent is enabled and World Properties > Surface is set to Background with completely transparent color. So, my question is, is there a way to force the diffuse layer background to be transparent?

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  • $\begingroup$ Are you rendering RGBA (including alpha) to a format that supports it? $\endgroup$
    – Robin Betts ♦
    Mar 20, 2021 at 11:33
  • $\begingroup$ @RobinBetts Yes, RGBA 8-bit to a PNG. $\endgroup$
    – lisyarus
    Mar 20, 2021 at 11:35

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Alpha is a different channel (like a pass) and diffuse pass is just a color channel, you could use the alpha socke with a "set alpha" to add that to a different pass. enter image description here

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  • $\begingroup$ Thank you! Already figured that I should use compositing nodes but didn't know there's a "set alpha" node, cool! $\endgroup$
    – lisyarus
    Mar 20, 2021 at 12:52

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