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Fixed in 2020.1.X

Fixed in 2019.3.X



Found in




Issue ID




Parts of Cloth Mesh disappear when entering Play mode



To reproduce:
1. Open attached project ("")
2. Open Assets -> Scenes -> "SampleScene"
3. Press Play and observe GameObject with Cloth in GameView

Expected result: Cloth Mesh is fully visible
Actual result: Parts of Cloth Mesh disappear

Reproduced in: 2019.2.0a7, 2019.2.1f1, 2019.3.0a12
Not reproducible in: 2019.1.14f1, 2019.2.0a6
Could not test in: 2017.4.31f1, 2018.4.6f1 (project kept breaking)

  1. Response avatar

    Resolution Note (fix version 2020.1):

    Fixed in 2020.1.0a19

Comments (12)

  1. Ea8897dae08ed0e6f99b1709117c819e?d=mm


    Dec 17, 2019 14:08

    So it's been 5 months... how about fixing it before Christmas?

  2. 1184606c6a0eadafe022fac44151535e?d=mm


    Dec 11, 2019 06:55

    Disable optimize mesh only fixes some issues, not the one described here. at least not on more complex meshes.

  3. 2c383450a9d6119fc0493e4b93a553e7?d=mm


    Dec 08, 2019 17:30

    Disable vertex order in your object's "Optimize Mesh" dropdown seem to make it behave normally.

  4. Ee1ae2e0411621c9709a56bbf29fcfde?d=mm


    Dec 03, 2019 08:28

    Please fix it!!!

  5. 1184606c6a0eadafe022fac44151535e?d=mm


    Dec 02, 2019 15:40

    I tried also in Unity 2019.3.0f1. For me it's still not working correctly, albeit it seems a bit better than before, the distortion is more limited, but still HUGE frame drop, and still it looks pretty unstable simulation, very different from 2019.01

  6. C0e1f91ace933c60bc8ea6b22c27f81b?d=mm


    Nov 28, 2019 18:30

    Cloth is working for me in Unity 2019.3.0f1. I'm the one that originally reported the issue in

  7. 89648c1019679041b7fb111cbbcb36e7?d=mm


    Oct 14, 2019 18:32

    In my findings it seems as though this issue is related to what happens when you enter playmode while a cloth is in a "bugged" state, i.e. it stretches/distorts randomly in the Editor. Discussion on the Unity forums have yielded a potential workaround for getting cloth out of this bugged state. In my test cases, disabling mesh optimization (setting from "All" to "None" in the import window) allowed cloth to behave normally. This makes it seem like recent changes to mesh optimization could be related and is worth looking at for Unity devs to track down the cause. More info is given on this thread:

  8. 4a0e4475db997596a6bd8a534a3c883e?d=mm


    Oct 03, 2019 14:27

    Please fix! It's currently not possible to upgrade a project from Unity 2018 to 2019 with cloth in it...

  9. C1c844202e9a7ba8831904374aa4bbc4?d=mm


    Sep 22, 2019 18:32

    still present in 2019.3.0b3

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