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Fixed in 2017.2.X



Found in


Issue ID




CharacterController might start to ignore collisions after a scene was reloaded more than 85 times



Steps to reproduce:
1. Open attached project
2. Open "Test" scene
3. Run the scene
4. Notice how "Instance {number}" fails to collide with "Character(Clone)" (gif attached)

Note: a lot of instances are created and if all succeed scene is loaded once again until a failure.

Does not reproduce on OSX.

Does not reproduce on Windows when number of attempts is less ~85.
Does reproduce on Windows when number of attempts is above ~85.

Reproduced with: 5.2.4f1, 5.3.3p3, 5.3.5p5, 5.4.0b24, 5.5.0f3

Comments (32)

  1. PierreTerdiman

    May 08, 2017 12:56

    I was made aware of this problem today, and fixed it. It is an issue in the Unity integration code, which will hopefully get fixed soon :)

  2. banyango

    Apr 26, 2017 19:47

    I upgraded to 5.5 from 5.4.3p4 and I'm getting this randomly now.

  3. change

    Apr 13, 2017 09:37

    Meet the same problem in Unity 5.5.0p4, 5.6.0f3
    Please fixed it,thanks

  4. ivjohn

    Mar 29, 2017 18:12

    Please could you post a link to the test project that reproduces this bug. Unfortunately it seems that the issue's attachments are not downloadable by the public.

  5. brean

    Jan 24, 2017 16:28

    Noticed the same issue on some occasions in Unity 5.5.0f3 during the Global Game Jam 2017 while developing a Shooter-like game.

  6. atmosgames

    Jan 19, 2017 18:05

    Finally heard back from Unity on this issue (replicated in Unity 5.5):

    I was successful in reproducing your bug and got some details about it from the developers.

    This is an issue that people tend to run into when using the Character Controller that ships with Unity. Unfortunately, this character controller was written by the folks over at PhysX as an example, and only became a feature addition because it was so widely used. It uses very patchy code that is hard to debug.

    Fortunately, in light of all the complaints received about the CC, we have decided to expose a PhysX method that will go leaps and bounds in aiding users to write their own character controller. It’s the Physics.ComputePenetration method and it will be available from Unity 5.6 going forward. If you’d like to check it out, 5.6 is in Beta right now.

  7. atmosgames

    Jan 09, 2017 22:27

  8. atmosgames

    Jan 05, 2017 22:37

    Still no answer? Anyone reproducing in Unity 5.5?

  9. Peris

    Dec 22, 2016 06:39

    Happens on mesh colliders too, just confirmed.

  10. Peris

    Dec 18, 2016 01:40

    Has anyone been able to confirm if this only happens on box colliders? If true I might change my world geo to mesh for a temporary fix, but I want to know before I do all the work :)

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