Rendering out an alpha pass

Development Cinematics & Media
1

Definitely one of the coolest ‘hidden’ new features of UE4.25+. Window > Cinematics > Movie Render Queue Rendering Alphas Out Of Unreal Engine - YouTube

Needs to be enabled in Plugins. Allowing you to export 16 bit exrs ie alpha channel!

Does anyone know if there is a way to have an HDR background which influences your actors but is NOT rendered out? Guessing there is but haven’t figured it out.

2

4.26 just added more render pass options.
In post video app of course you can remove BG with the alpha.
Other things check: How can I hide a HDRI sphere during Sequencer recording? - Rendering - Unreal Engine Forums

3

Thanks. Also discovered I can apply my cubemap to the Skylight instead.