Search Issue Tracker

Fixed in 2018.2.X

Fixed in 2017.3.X, 2017.4.X, 2018.1.X



Found in



Issue ID




[iOS] Rigidbody interpolation causes objects to jitter



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 (41)

  1. FlyingHighUp

    Jan 31, 2018 06:58

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

  2. PixelKnights

    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

  3. Zullar

    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?

  4. MudPuppet

    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.

  5. madcowie

    Dec 24, 2017 14:53

    I don't see how this version was released with such a huge problem. Beta testing?

  6. smirk

    Dec 20, 2017 07:12

    I've just upgraded to 2017.3 and still have the same problem.

  7. smirk

    Dec 19, 2017 13:00

    We are also having the exact same problem in 2017.2 on iPhone6+ and iPhone5.

  8. MudPuppet

    Dec 10, 2017 02:45

    Same issue here in 2017.2.0 and 2017.2.0p4 on iPhone6+ / iOS11.x. Really glad I found this thread as it is almost not noticeable in my project and if it weren't for the fact that I have spent a year working on the project and building to the device I would have had a very hard time proving the existence of the problem to some associates.

  9. sberg-spungegames

    Dec 07, 2017 03:43

    We have some sort of interpolation issue with Unity that has come up in 2017.2 see below:

    Footage in 2017.1.2
    Footage in 2017.2

    It appears to be the same issue as this, with physics interpolation hiccuping and stuttering. We have rolled back our versions of Unity to 2017.1.2 and are hoping this issue is fixed in a future Unity release.

Add comment

Log in to post comment

All about bugs

View bugs we have successfully reproduced, and vote for the bugs you want to see fixed most urgently.