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Official Disable HMD Roll in VR

Discussion in 'Particle System Previews' started by richardkettlewell, Mar 5, 2020.

  1. richardkettlewell

    richardkettlewell

    Unity Technologies

    Joined:
    Sep 9, 2015
    Posts:
    2,239
    We have an option in Unity since 2018.4 that disables camera roll, which prevents unwanted particle rotation when a user tilts their head in VR. It works for most use-cases, but there can be situations where it breaks (looking straight up/down).

    It's hard for us to fix this within Unity due to how our rendering code is organised, but it is possible to provide a more robust solution with a script, if you only have 1 camera to think about (which in VR is usually the case!)

    I'm sharing the scripts here for convenience - I'm providing one that works without Burst, which requires Unity 2018.4 (but can easily be modified to use a slower version of Set/GetParticles, which can work in any Unity verision) and a very fast optimized version that uses our Burst compiler, but requires Unity 2019.3 or newer.

    Almost all the credit for this goes to @bgolus, who wrote the original script and shared it here: https://forums.oculusvr.com/developer/discussion/5998/hmd-roll-and-particles
    I've simply converted it to run in a Burst C# job.
     

    Attached Files:

    richardkettlewell, Mar 5, 2020
    #1
    RenderFX, KillMobil, jojue and 4 others like this.

  2. hippocoder

    hippocoder

    Digital Ape Moderator

    Joined:
    Apr 11, 2010
    Posts:
    29,723
    Thanks both of you for dev quality of life stuff :D
     
    hippocoder, Mar 5, 2020
    #2
    richardkettlewell likes this.

  3. Mephesto_Khaan

    Mephesto_Khaan

    Joined:
    Jun 2, 2013
    Posts:
    47
    Just came from the future to say you need to convert the `_rotationDifference` to Radians.
     
    Mephesto_Khaan, Dec 26, 2020
    #3
    richardkettlewell likes this.

  4. cocapasteque

    cocapasteque

    Joined:
    Sep 30, 2016
    Posts:
    20
    I'm digging up this post to say that this still happens in 2020.1.17f1, even with the fix code you posted here :/
    It makes the particle system kinda useless for VR at this point :/

    I remember already getting this issue last year, and just found some not-pretty workarounds :/
     
    cocapasteque, Mar 15, 2021
    #4

  5. richardkettlewell

    richardkettlewell

    Unity Technologies

    Joined:
    Sep 9, 2015
    Posts:
    2,239
    Hi, we have no open reported bugs for this feature. You are welcome to report a bug and then we will be able to look at the issue.
     
    richardkettlewell, Mar 15, 2021
    #5