No MSAA without intermediate render texture in VR

I'm using Unity 2019.3.0f1 and URP 7.1.6 for a VR project. We aren't using a depth texture, but I noticed in Renderdoc that one was being created even when it was disabled in the URP settings.

I edited the ForwardRenderer locally to make the intermediateRenderTexture bool always false, so that it skips the intermediate render texture step. This results in much better performance, but antialising is no longer applied to the eye texture.

There is a comment in ForwardRenderer saying "if rendering to intermediate render texture we don't have to create msaa backbuffer," and a path for it to handle AA without that - so I'm thinking this is a bug, rather than the intended functionality? (I opened a bug case number 1204783, but any guidance would be appreciated here too!)

 

Thanks for reporting this. In case anyone has the same issue, here is the workaround on this topic of waiting a frame and then re-setting the eye texture resolution:
https://forum.unity.com/threads/quest-lwrp-urp-msaa-not-working.786026/#post-5372994

You can also track the issue here: https://issuetracker.unity3d.com/product/unity/issues/guid/1197958