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[HDRP + VR] MSAA/Forward Rendering causes stereo effect in one eye

Discussion in 'VR' started by Eli-Davis, Jul 10, 2019.

  1. Eli-Davis

    Eli-Davis

    Joined:
    Jun 2, 2011
    Posts:
    19
    Has anyone had this issue located in this thread? The issues with MSAA is the only thing keeping me from upgrading my VR project to 2019.

    Summary of the problem is that when using MSAA in VR, both eyes start rendering to the left eye, and the right eye goes black.
     
    Eli-Davis, Jul 10, 2019
    #1

  2. fabien-unity

    fabien-unity

    Unity Technologies

    Joined:
    Oct 17, 2018
    Posts:
    60
    (edited)

    I'd suggest following the recommendations from this thread.

    As a recap:
    2019.1 : only single-pass (double-wide) is supported and MSAA is NOT compatible with it (broken)
    2019.2+ : multi-pass and single-pass (instancing) are supported but single-pass (double-wide) is not
     
    Last edited: Jul 16, 2019
    fabien-unity, Jul 10, 2019
    #2

  3. Eli-Davis

    Eli-Davis

    Joined:
    Jun 2, 2011
    Posts:
    19
    Right. In 2019.1.9f1 I created a new project with the HDRP template. It uses HDRP 5.7.2 preview by default. I enabled VR in Player settings and set it to single pass (double-wide). I then went to the HDRenderPipelineAsset and changed Lit Shader Mode to Forward Only, and Multisample Anti-aliasing Quality to 4x. I then checked the box for "MSAA within Forward", and I end up with the issue.

    My HMD is the original Vive (steam VR is not imported into the project, but importing it doesn't change anything).

     
    Last edited: Jul 10, 2019
    Eli-Davis, Jul 10, 2019
    #3

  4. Benjams

    Benjams

    Unity Technologies

    Joined:
    Oct 27, 2017
    Posts:
    20
    Thanks for taking the time to post your detailed repro steps! We were able to reproduce this with your workflow and have opened a ticket to resolve this issue.
     
    Benjams, Jul 15, 2019
    #4

  5. Benjams

    Benjams

    Unity Technologies

    Joined:
    Oct 27, 2017
    Posts:
    20
    Unfortunately we won't be able to fix this issue in the 2019.1 package. We suggest upgrading to 2019.2 where this issue appears to be resolved.
     
    Benjams, Jul 15, 2019
    #5
    ROBYER1 likes this.

  6. Eli-Davis

    Eli-Davis

    Joined:
    Jun 2, 2011
    Posts:
    19
    Thanks for the update!
     
    Eli-Davis, Jul 15, 2019
    #6