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Fixed in Unity 2018.2



Found in


Issue ID




[iOS] Rigidbody interpolation causes objects to jitter




Priority: 2Necessary for shipping a final release


Severity: 2Core functionality majorly impacted

Steps to reproduce:
1. Download the user's attached project
2. Build to iOS
3. Observe the cube travelling in the screen

Expected: cube travels from left to right smoothly
Actual: cube jumps multiple times

Did not reproduce on: 2017.1.2p3, 2017.2.0a3
Reproduced on: 2017.2.0a4, 2017.2.0p3, 2017.3.0b11 (OpelGLES2 & Metal)

Regression introduced in: 2017.2.0a4

Reproduced with: iPhone 6S, iOS 11.0 (15A372)

Also reproduced on android:
Htc HTC 10*, OS:7.0, CPU:arm64-v8a, GPU:Adreno (TM) 530, Build:htc/pmeuhl_00401/htc_pmeuhl:7.0/NRD90M/857212.41:user/release-keys

Samsung SM G930F*, OS:7.0, CPU:arm64-v8a, GPU:Mali-T880, Build:samsung/heroltexx/herolte:7.0/NRD90M/G930FXXS1DQHF:user/release-keys

Xiaomi MI NOTE Pro*, OS:7.0, CPU:arm64-v8a, GPU:Adreno (TM) 430, Build:Xiaomi/leo/leo:7.0/NRD90M/7.11.2:user/release-keys (edited)

Comments (36)

  1. 5910b75ebcabadc11908c4cd34d1421f?d=mm


    Apr 10, 2018 08:22

    Anyone tried in LTS 2017.4.1 ?

  2. D0bb5965a8517e247887c97b9114ae33?d=mm


    Apr 05, 2018 08:32

    We need that reviewed please.

  3. A97c8825326247ba91e394c037157a0b?d=mm


    Mar 18, 2018 07:39

    Bastard bug and NOT fixed YET! My game is killed by it! Damn unity :(

  4. 4ffc9c1dac81a690226f3e558324df12?d=mm


    Mar 15, 2018 22:04

    Is there any progress on the review? Seems to be a blocker for me.

  5. Cb15702dd107b280b5b648ebd84cbdcd?d=mm


    Mar 15, 2018 13:44

    Still having this issue with 2017.3.1.p4

  6. 8332824099d91f2b6b4b0f7e67bed893?d=mm


    Jan 31, 2018 06:58

    Oh my goodness this bug. Is there a way to get notified when it is fixed?

  7. Fd4a3a6231bc616ff6a1a411c569a260?d=mm


    Jan 09, 2018 09:13

    Can reproduce on OSX as well not just IOS build, seeing jutter when moving rigidbody since upgrading from 2017.1 to 2017.2.0.p3

  8. 783d50c318ea066fe50bde531bf259b3?d=mm


    Jan 03, 2018 21:20

    I also see jitter on PC. The underlying cause is that Time.deltaTime varies greatly (from 2ms to 30ms for me) even with VSync enabled and a 60Hz monitor refresh rate.

    Is your bug with the Rigidbody Interpolator, or is the underlying cause Time.deltaTime variation which the Rigidbody Interpolator internally uses?

  9. Ae6eb985b41c5c1aaf3e457c93034257?d=mm


    Jan 01, 2018 04:00

    It appears that the issue is either less noticeable or perhaps non-existent on an iPhoneX with Unity 2017.3.0(f3). I have only tested with one level and will add another comment if I am mistaken.

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