Full Copy'ing a scene confuses physics in the original scene #90246

New Issue

Shish · 2021-07-27T19:59:16+02:00

Shish commented

2021-07-27 19:59:16 +02:00

System Information
Operating system: Windows
Graphics card: GTX 1080

Blender Version
Broken: 2.93

1. Took this .blend file from an online competition. Hit "play", the ball falls down according to regular physics.
1. Delete and re-bake the animation. Hit "play", the ball still falls down.
1. Scene -> Full Copy. Delete and re-bake the animation (in either the original scene or the copy). Hit "play", now the ball jumps up and sideways.

Uploaded each step as a separate .blend so you can just hit "play" on each file and see that originally and before full-copy-ing, the ball falls down; but after making a copy, the ball jumps sideways.

01-original.blend

02-delete-all-bake-all.blend

03-full-copy-delete-copy-delete-all-bake-all.blend

**System Information** Operating system: Windows Graphics card: GTX 1080 **Blender Version** Broken: 2.93 - 1) Took this .blend file from an online competition. Hit "play", the ball falls down according to regular physics. - 2) Delete and re-bake the animation. Hit "play", the ball still falls down. - 3) Scene -> Full Copy. Delete and re-bake the animation (in either the original scene or the copy). Hit "play", now the ball jumps up and sideways. Uploaded each step as a separate .blend so you can just hit "play" on each file and see that originally and before full-copy-ing, the ball falls down; but after making a copy, the ball jumps sideways. [01-original.blend](https://archive.blender.org/developer/F10241464/01-original.blend) [02-delete-all-bake-all.blend](https://archive.blender.org/developer/F10241465/02-delete-all-bake-all.blend) [03-full-copy-delete-copy-delete-all-bake-all.blend](https://archive.blender.org/developer/F10241466/03-full-copy-delete-copy-delete-all-bake-all.blend)

Shish commented

2021-07-27 19:59:16 +02:00

Added subscriber: @shish_blender

blender-admin commented

2021-07-27 19:59:16 +02:00

#76588 was marked as duplicate of this issue

Germano Cavalcante commented

2021-08-03 15:30:38 +02:00

Added subscribers: @Edgar_Hu, @mano-wii

Philipp Oeser commented

2021-08-04 13:38:11 +02:00

Added subscribers: @ZedDB, @mont29, @lichtwerk

Philipp Oeser commented

2021-08-04 13:38:11 +02:00

Changed status from 'Needs Triage' to: 'Needs Developer To Reproduce'

Philipp Oeser commented

2021-08-04 13:38:11 +02:00

Problem in that file/example is that indeed (as mentioned in #76588) the Rigid Body World is not duplicated.
This results in the situation that the copies of all objects participate in the same rigid body world sim (even though they might not be in the view layer), and since these all overlap, we get explosions or hoppin to the side as in this case.

In general, it seems possible to have multiple rigidbody worlds (one in each different scene) -- although other reports suggest that there are parts in the code that still assume only one rigid body world being present (see e.g. #62005)
#90246 multiple RB worlds.blend

So I guess we have to ask:

- @ZedDB : are you aware of the "only one RB world" limitation? (or should it be supported to have one RB world per scene - as in my example [which seems to work fine])
- @mont29: if one RB world per scene is OK, then why are we not duplicating the collection on full scene copy?

Problem in that file/example is that indeed (as mentioned in #76588) the Rigid Body World is not duplicated. This results in the situation that the copies of all objects participate in the same rigid body world sim (even though they might not be in the view layer), and since these all overlap, we get explosions or hoppin to the side as in this case. ![image.png](https://archive.blender.org/developer/F10264879/image.png) In general, it seems possible to have multiple rigidbody worlds (one in each different scene) -- although other reports suggest that there are parts in the code that still assume only one rigid body world being present (see e.g. #62005) [#90246 multiple RB worlds.blend](https://archive.blender.org/developer/F10265068/T90246_multiple_RB_worlds.blend) So I guess we have to ask: - - [x] @ZedDB : are you aware of the "only one RB world" limitation? (or should it be supported to have one RB world per scene - as in my example [which seems to work fine]) - - [x] @mont29: if one RB world per scene is OK, then why are we not duplicating the collection on full scene copy?

Philipp Oeser commented

2021-08-04 13:45:33 +02:00

Seems like this was tackled at some point, see 2043d801e8

Seems like this was tackled at some point, see 2043d801e8

blender-admin commented

2021-09-30 15:22:16 +02:00

This issue was referenced by 1a72744ddc

This issue was referenced by 1a72744ddc4a34ce32f308a9011423c2099b49d3

Bastien Montagne commented

2021-09-30 16:05:30 +02:00

Changed status from 'Needs Developer To Reproduce' to: 'Resolved'

Bastien Montagne closed this issue

2021-09-30 16:05:30 +02:00

Bastien Montagne self-assigned this 2021-09-30 16:05:30 +02:00

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Full Copy'ing a scene confuses physics in the original scene #90246