Unity Issue Tracker - Cloth performance drops when increasing the number of GameObjects with Cloth and then decreasing it

Fixed in 2022.2.X

Votes

20

Found in

2018.4.0f1

2018.4.4f1

2019.1.0a1

2019.2.0a1

2019.3.0a1

Issue ID

1173457

Regression

No

Cloth performance drops when increasing the number of GameObjects with Cloth and then decreasing it

Physics

-

Jul 31, 2019

How to reproduce:
1. Open the attached project (case_1173457.zip)
2. Enter Play Mode
3. Set the "Active" Cloth slider to 2 > observe FPS
4. Set the slider to 48 > set back to 2

Expected result: FPS value is the same as it was in step 3
Actual result: FPS value decreases twice

Reproducible with: 2018.4.6f1, 2019.1.14f1, 2019.2.1f1, 2019.3.0a11

Notes:
- Could not reproduce on 2017.4.31f1 because of Console errors
- There is a slider offset in newer versions, to reproduce efficiently - mouse pointer needs to be put above the slider to use it
- FPS value drop depends on the computer - can vary from 2x times drop to 4x or even more

Resolution Note (fix version 2022.2):

Fixed in: 2022.2.0a10

Log in to vote on this issue

Comments (4)

makaka-org

Sep 12, 2023 19:13

Related to this issue resolving: In changelog of Unity 2022.2 you indicated that the cloth system is split into three stages: skinning, simulation and read-back.

So, how to get access to each of these stages?

My detailed question is here (as well as resolution for Cloth Scaling in Unity 2022.3+): https://forum.unity.com/threads/how-to-reset-the-cloth-during-runtime.1481910/
Jakub_Machowski

Apr 20, 2023 10:48

Will that be fixed in 2021 LTS?
TacticalShader

Apr 23, 2020 12:24

If every cloth but one are frustum culled, the simulation cost is the same as if all the clothes are simulated. This can be tested by disabling all the culled clothes and noticing the cost in the profiler.
NathanRH

Aug 14, 2019 09:15

This issue makes it almost impossible to have many complex cloth characters. Please fix :)

Search Issue Tracker

20