Search Issue Tracker

Fixed in 2021.1.X

Fixed in 2019.4.X, 2020.1.X, 2020.2.X



Found in




Issue ID




Cloth simulation is not natural when Time Scale is changed from one that's close to zero to 1



Steps to reproduce:
1. Open user's attached project
2. Open Project Settings window
3. Go to Time settings
4. Enter Playmode
5. Change Time Scale to 0.001 and then back to 1

Actual result: when Time Scale is changed from 0.001 to 1, Cloth moves way more than it should on such Time Scale
Expected result: when Time Scale is changed from 0.001 to 1, Cloth moves at the normal speed

Reproducible with: 2017.4.35f1, 2018.4.14f1, 2019.2.16f, 2019.3.0f3, 2020.1.0a16

  1. Resolution Note (fix version 2021.1):

    Fixed in: 2021.1.0a1

  2. Resolution Note (fix version 2020.2):

    Fixed with: 2020.2.0b8

  3. Resolution Note (fix version 2020.1):

    Fixed in 2020.1.11f1

  4. Resolution Note (fix version 2019.4):

    Fixed in 2019.4.13f1

Comments (2)

  1. SonicBloomEric

    Oct 26, 2020 21:23

    (As an addendum to my last comment, I should note that the impulses resulting from the collision are far more muted after updating to 2019.4.13f1...)

  2. SonicBloomEric

    Oct 26, 2020 21:22

    I believe we were seeing this with collisions involving Physics.SphereCast (and brethren) as well.

    The annoying thing is that the Physics interactions shouldn't have happened in the first place due to layer mask settings. It seems layer mask settings may be ignored by the Physics.*Cast APIs with very low time scales (and thus fixed time step values).

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.