Hd/fix backplate globalcubemap2 #3111
Merged
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This PR is a recreation of #3090 and has already been reviewed
Purpose of this PR
This PR removes rendering of backplates inside the cubemap generated for lightng in the HDRI sky.
The reason is that it did not make sense conceptually since the backplate needs a position and the cubemap is rendered at infinity. This caused artefacts in reflections coming from the sky cubemap.
This will fix https://fogbugz.unity3d.com/f/cases/1276692/
Testing status
Tested the repro scene provided in the case.
@Unity-Technologies/gfx-qa-hdrp it could be good to test a bit more thoroughly the backplate feature as I'm not 100% familiar with it so I might have missed some cases. Also please test local reflection probes. They should still contain the backplate.