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+--- Thread: About Moving? (/thread-2771.html)
RE: About Moving? - josemendez - 02-03-2021
Taking a look at it right now
RE: About Moving? - josemendez - 02-03-2021
Hi there,
I can't reproduce any issues in either platform, it behaves exactly as in-editor. Tested on iPhone 7 (iOS 14.4) and Xiaomi A2 Lite, here's a video:
Another user recently reported strange behavior on iOS, but it wasn't reproducible as well:
http://obi.virtualmethodstudio.com/forum/thread-2779.html
What simulation backend are you using? are you using Burst? if so, have you installed the Burst dependencies?
RE: About Moving? - josemendez - 02-03-2021
Further testing reveals there's a bug in interpolation, when using the Oni backend in mobile platforms. Using Burst (as I was in the video above), disabling interpolation, or running in a platform other than iOS/Android does not trigger this issue. Will fix it and provide a patch asap.
As a workaround, use Burst (preferred option, as Oni will eventually be deprecated) or disable interpolation in the ObiSolver.
thanks for reporting this!
RE: About Moving? - josemendez - 02-03-2021
Turns out this is a bug in Unity: Time.deltaTime returns incorrect values (often negative) since Unity 2020.2. This isn't reproducible in editor. Why is this the case, I don't know. I suspect it's related to this: https://blogs.unity3d.com/es/2020/10/01/fixing-time-deltatime-in-unity-2020-2-for-smoother-gameplay-what-did-it-take/
Since Oni relies on Time.deltaTime / Time.fixedDeltaTime to perform interpolation, the resulting interpolated particle positions are wrong. The Burst backend however, clamps this quotient to <0,1>, so any negative values turn to 0 and the result of interpolation is always the position from the last frame. In the next update I will clamp interpolation in Oni too, but this is far from ideal.
Will report this bug to Unity.
Edit: Posted in the Unity forums to get some more insight on this:
https://forum.unity.com/threads/fixedupdate-and-time-deltatime-inconsistent-since-2020-2.1067567/
RE: About Moving? - zero16832 - 02-03-2021
(02-03-2021, 01:54 PM)josemendez Wrote: Turns out this is a bug in Unity: Time.deltaTime returns incorrect values (often negative) since Unity 2020.2. This isn't reproducible in editor. Why is this the case, I don't know. I suspect it's related to this: https://blogs.unity3d.com/es/2020/10/01/fixing-time-deltatime-in-unity-2020-2-for-smoother-gameplay-what-did-it-take/thx for your help,if i use the 2020.2 and just use the Burst to this project,it can fix this bug?
Since Oni relies on Time.deltaTime / Time.fixedDeltaTime to perform interpolation, the resulting interpolated particle positions are wrong. The Burst backend however, clamps this quotient to <0,1>, so any negative values turn to 0 and the result of interpolation is always the position from the last frame. In the next update I will clamp interpolation in Oni too, but this is far from ideal.
Will report this bug to Unity.
Edit: Posted in the Unity forums to get some more insight on this:
https://forum.unity.com/threads/fixedupdate-and-time-deltatime-inconsistent-since-2020-2.1067567/
RE: About Moving? - josemendez - 02-03-2021
(02-03-2021, 02:42 PM)zero16832 Wrote: thx for your help,if i use the 2020.2 and just use the Burst to this project,it can fix this bug?
Yes, using Burst will fix it. Using any Unity version prior to 2020.2 does too.
RE: About Moving? - zero16832 - 02-03-2021
(02-03-2021, 02:44 PM)josemendez Wrote: Yes, using Burst will fix it. Using any Unity version prior to 2020.2 does too.THX
RE: About Moving? - zero16832 - 03-03-2021
(02-03-2021, 01:54 PM)josemendez Wrote: Turns out this is a bug in Unity: Time.deltaTime returns incorrect values (often negative) since Unity 2020.2. This isn't reproducible in editor. Why is this the case, I don't know. I suspect it's related to this: https://blogs.unity3d.com/es/2020/10/01/fixing-time-deltatime-in-unity-2020-2-for-smoother-gameplay-what-did-it-take/I find this Bug in other unity version,it 2020.1.17f1c1. oni mode and not interpolation whit android.
Since Oni relies on Time.deltaTime / Time.fixedDeltaTime to perform interpolation, the resulting interpolated particle positions are wrong. The Burst backend however, clamps this quotient to <0,1>, so any negative values turn to 0 and the result of interpolation is always the position from the last frame. In the next update I will clamp interpolation in Oni too, but this is far from ideal.
Will report this bug to Unity.
Edit: Posted in the Unity forums to get some more insight on this:
https://forum.unity.com/threads/fixedupdate-and-time-deltatime-inconsistent-since-2020-2.1067567/
RE: About Moving? - josemendez - 03-03-2021
(03-03-2021, 02:11 PM)zero16832 Wrote: I find this Bug in other unity version,it 2020.1.17f1c1. oni mode and not interpolation whit android.
I've been unable to reproduce anything similar in older Unity versions, yesterday I tried:
- Unity 2018.4 + Obi 4.1
- Unity 2019.3 + Obi 6.0.1
- Unity 2020.1 + Obi 6.0.1
- Unity 2020.2 + Obi 6.0.1
All using the Oni backend.
In could only reproduce this in 2020.2, so I generated a minimal repro project for Unity and reported the bug. So this must probably be a different bug. Can you provide a repro project/scene so that I can test it under the exact same conditions as you?
RE: About Moving? - zero16832 - 03-03-2021
(03-03-2021, 02:28 PM)josemendez Wrote: I've been unable to reproduce anything similar in older Unity versions, yesterday I tried:i have send your in email yesterday?
- Unity 2018.4 + Obi 4.1
- Unity 2019.3 + Obi 6.0.1
- Unity 2020.1 + Obi 6.0.1
- Unity 2020.2 + Obi 6.0.1
All using the Oni backend.
In could only reproduce this in 2020.2, so I generated a minimal repro project for Unity and reported the bug. So this must probably be a different bug. Can you provide a repro project/scene so that I can test it under the exact same conditions as you?