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This is the coffee cup that I made and it is rendered with the cycles engine on top of a white plane: enter image description here

This is the coffee cup that I made and it is rendered with the cycles engine on top of a white plane acting as a shadow catcher. AKA for the plane I selected "Object Properties" > "Visibility" > then checked the box "Shadow Catcher". I also checked the box labeled "transparent" under "film" in the "Render Properties" tab: enter image description here

I am trying to composite this cup into a video (using davinci resolve) so I need the background to be transparent but the cup just ends up looking white instead of clear. Is there a way to make the cup have a shadow while still being mostly transparent?

Btw, I'm using Blender 2.83.5

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  • $\begingroup$ Did you render/save the alpha channel? $\endgroup$
    – Ron Jensen
    Commented Aug 31, 2020 at 3:23
  • $\begingroup$ How would I do that? Is there a way to export/save the alpha channel separately? The only place in this file that I see "alpha" listed is here in my composite node. imgur.com/dQBKG76 $\endgroup$ Commented Aug 31, 2020 at 4:40
  • $\begingroup$ What format are you using to export the image? Try EXR. $\endgroup$
    – no-can-do
    Commented Aug 31, 2020 at 5:29

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GUI Setting Under "Film" also check "Transparent Glass" You must use a Glass Shader on your glass, adding a Gloss Shader mixing a with Fresnel works, too.

Full Render

It is possible to save the alpha channel separately. The alpha channel

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