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How do I set an object to render as the background material? As shown in the below images the Sphere and background would render out as transparent in a PNG sequence.

Images are just sample. For my use, boolean or similar doesn't work, so some magic material would be best :)

In old Blender it was known as something like "set background as a material".

Any help greatly appreciated!

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What you show looks like the Shader > Holdout node:

enter image description here

You can also enable the Holdout option in the Object panel > Visibility > Mask:

enter image description here

Also as Vklidu suggests, you can enable the Holdout option for a collection in the Outliner, remember to activate in the Outliner's filter:

enter image description here

To make your background transparent, go into the Render panel > Film, and enable Transparent.

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  • $\begingroup$ @vklidu oh yes thanks I forgot this one $\endgroup$
    – moonboots
    Commented Apr 30, 2022 at 19:25
  • $\begingroup$ ... too many options :) You can delete me from description to clean it up :) $\endgroup$
    – vklidu
    Commented Apr 30, 2022 at 19:51
  • $\begingroup$ Yes!! I completely forgot about holdout!! Huge thanks!! $\endgroup$
    – Eoin
    Commented May 1, 2022 at 1:23

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