Deleting rigid body deletes object that is not selected but leaves the one that you tried to delete #77181

New Issue

Artturi Mäntysaari · 2020-05-29T23:23:34+02:00

2020-05-29 23:23:34 +02:00

System Information
Operating system: !in 10
Graphics card: gtx 960 4gb

Blender Version
Broken:
2.82a
2.83.0 691a1e3357 (2020-05-29 17:42)
2.90.0 2ee94c954d (2020-05-29 18:08)

Short description of error
You have a setup where you are having a big amount of rigid bodies. You play the animation until you have a good distribution of objects for your render and you try to delete one that is artistically in bad location. Blender doesn't allow you to delete it. Instead it is deleting something that you didn't select. See this video where I am trying to delete rigid bodies.

deleting_rigid_bodies.mp4

The problem doesn't occur at the first frame of the animation.

Exact steps for others to reproduce the error
Create a blend file with big amount of duplicated rigid bodies. Play animation little forward. Try to delete one of the rigid bodies.

Or

Download the file attached below.
Press play on the timeline to run the simulation.
Stop the simulation at a frame like 50 and start deleting some of the cubes. Notice how in most situations the cube deleted is not the one selected.
If you then go back to the first frame, you'll notice that the cubes you selected and deleted are actually the ones deleted.
#77181 - Rigid Body.blend

**System Information** Operating system: !in 10 Graphics card: gtx 960 4gb **Blender Version** Broken: 2.82a 2.83.0 691a1e3357 (2020-05-29 17:42) 2.90.0 2ee94c954d (2020-05-29 18:08) **Short description of error** You have a setup where you are having a big amount of rigid bodies. You play the animation until you have a good distribution of objects for your render and you try to delete one that is artistically in bad location. Blender doesn't allow you to delete it. Instead it is deleting something that you didn't select. See this video where I am trying to delete rigid bodies. [deleting_rigid_bodies.mp4](https://archive.blender.org/developer/F8564186/deleting_rigid_bodies.mp4) The problem doesn't occur at the first frame of the animation. **Exact steps for others to reproduce the error** Create a blend file with big amount of duplicated rigid bodies. Play animation little forward. Try to delete one of the rigid bodies. Or 1. Download the file attached below. 2. Press play on the timeline to run the simulation. 3. Stop the simulation at a frame like 50 and start deleting some of the cubes. Notice how in most situations the cube deleted is not the one selected. 4. If you then go back to the first frame, you'll notice that the cubes you selected and deleted are actually the ones deleted. [#77181 - Rigid Body.blend](https://archive.blender.org/developer/F8563886/T77181_-_Rigid_Body.blend)

Artturi Mäntysaari commented

2020-05-29 23:23:34 +02:00

Added subscriber: @ArtturiMantysaari

Alaska commented

2020-05-29 23:57:24 +02:00

Added subscriber: @Alaska

Alaska commented

2020-05-29 23:57:24 +02:00

Changed status from 'Needs Triage' to: 'Confirmed'

Alaska commented

2020-05-29 23:57:24 +02:00

I'm able to reproduce in 2.82a, 2.83.0 691a1e3357 (2020-05-29 17:42), and 2.90.0 2ee94c954d (2020-05-29 18:08).

Sorry if these are the incorrect project tags.

Not sure if this is a known issue.

I will update the description of your task to include a file and exact steps.

I'm able to reproduce in 2.82a, 2.83.0 `691a1e3357` (2020-05-29 17:42), and 2.90.0 `2ee94c954d` (2020-05-29 18:08). Sorry if these are the incorrect project tags. Not sure if this is a known issue. I will update the description of your task to include a file and exact steps.

Bastien Montagne commented

2020-06-02 10:54:11 +02:00

Added subscriber: @mont29

Bastien Montagne commented

2020-06-02 10:54:11 +02:00

This is a simulation issue, deleting the object does remove it from the rigid body world, but that one is not updating itself, so all displayed simulated objects after the deleted one shift one position...

Not sure whether simulation itself should support that kind of behavior, or if we should invalidate the whole cached simulation on such operations?

This is a simulation issue, deleting the object does remove it from the rigid body world, but that one is not updating itself, so all displayed simulated objects after the deleted one shift one position... Not sure whether simulation itself should support that kind of behavior, or if we should invalidate the whole cached simulation on such operations?

Jacques Lucke commented

2020-08-14 16:10:04 +02:00

Added subscriber: @JacquesLucke

Jacques Lucke commented

2020-08-14 16:10:04 +02:00

This is a bug, but fixing it requires some more design work as @mont29 said. It's unlikely that someone will work on this soon.

blender-admin commented

2020-09-02 18:26:37 +02:00

This issue was referenced by f20f82ce3e

This issue was referenced by f20f82ce3ee55c12adcec024e0133e71183e07b3

Sebastian Parborg commented

2020-09-02 18:35:34 +02:00

Changed status from 'Confirmed' to: 'Resolved'

Sebastian Parborg closed this issue

2020-09-02 18:35:34 +02:00

Sebastian Parborg self-assigned this 2020-09-02 18:35:34 +02:00

Sebastian Parborg commented

2020-09-02 18:37:51 +02:00

Just a heads up:

This is now fixed for non baked caches.

The issue is that the object order in the object array shifts around when deleting objects.
(The object that is deleted swaps positions with the last object in the array)

Supporting this kind of reorder might be tricky on the cache side, especially on undo.

Just a heads up: This is now fixed for non baked caches. The issue is that the object order in the object array shifts around when deleting objects. (The object that is deleted swaps positions with the last object in the array) Supporting this kind of reorder might be tricky on the cache side, especially on undo.

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Deleting rigid body deletes object that is not selected but leaves the one that you tried to delete #77181