Blender 4.0.0 - Armature Rig with IK broken #111553

New Issue

Ilja Razinkov · 2023-08-26T12:11:42+02:00

Ilja Razinkov commented

2023-08-26 12:11:42 +02:00

First-time contributor

System Information
Operating system: MacOs Ventura 13.4.1
Graphics card: Radeon Pro

Blender Version
Broken: version: 4.0.0 Alpha, branch: main, commit date: 2023-08-23 19:52, hash: 7c2dc5183d, type: release
Caused by 6b872079fe

Short description of error
I have rigged mesh, commercially available at ArtStation. It worked well up until now. In 4.0.0 it is broken:

shapes not rendered until i switch to wireframe mode and back
IK ignored

Look at video - i open the file in 3.6.3 and in 4.0.0. In 3.6.3 everything fine, in 4.0.0 the problem mentioned occur.
Blend file also attached

**System Information** Operating system: MacOs Ventura 13.4.1 Graphics card: Radeon Pro **Blender Version** Broken: version: 4.0.0 Alpha, branch: main, commit date: 2023-08-23 19:52, hash: 7c2dc5183d03, type: release Caused by 6b872079fec9336865638ad9cfa76e37e8e627c5 **Short description of error** I have rigged mesh, commercially available at ArtStation. It worked well up until now. In 4.0.0 it is broken: - shapes not rendered until i switch to wireframe mode and back - IK ignored Look at video - i open the file in 3.6.3 and in 4.0.0. In 3.6.3 everything fine, in 4.0.0 the problem mentioned occur. Blend file also attached

Screen Recording 2023-08-26 at 13.01.20.mov

21 MiB

Screen Recording 2023-08-26 at 13.02.21.mov

49 MiB

Anime_Male_A.blend

3.4 MiB

Ilja Razinkov added the

labels 2023-08-26 12:11:43 +02:00

Richard Antalik commented

2023-08-28 20:35:55 +02:00

The missing shapes are probably result of new workbench engine. I don't see it reported yet. Can you make separate report for that?
I can confirm IK not working correctly, will bisect.

The missing shapes are probably result of new workbench engine. I don't see it reported yet. Can you make separate report for that? I can confirm IK not working correctly, will bisect.

👍 2

Richard Antalik added

and removed

labels 2023-08-28 20:36:10 +02:00

Richard Antalik commented

2023-08-28 22:49:03 +02:00

6b872079fe is culprit, CC @nathanvegdahl

6b872079fec9336865638ad9cfa76e37e8e627c5 is culprit, CC @nathanvegdahl

Ilja Razinkov referenced this issue

2023-08-29 20:25:50 +02:00

Regression: Bone shapes in armature are not visible until wireframe mode #111668

Ilja Razinkov commented

2023-08-29 20:26:34 +02:00

First-time contributor

The missing shapes are probably result of new workbench engine. I don't see it reported yet. Can you make separate report for that?

Done, added bugreport here - #111668

> The missing shapes are probably result of new workbench engine. I don't see it reported yet. Can you make separate report for that? Done, added bugreport here - https://projects.blender.org/blender/blender/issues/111668

Nathan Vegdahl commented

2023-08-31 17:38:18 +02:00

Minimal repro:
111553_minimal_repro.blend

The issue appears to be triggered by having two IK constraints on the same bone, with the first in the stack being disabled or zero-influence.

Note that in the provided Anime_Male_A.blend, these two IK constraints appear (if I'm understanding the rig setup correctly) to be redundant, so the rig can be fixed by simply deleting the disabled IK constraint. The bug should still be fixed in Blender, of course. But in case this is currently blocking you, @IPv6

Minimal repro: [111553_minimal_repro.blend](/attachments/bab5f124-075e-4754-8f33-caf5d99b94f1) The issue appears to be triggered by having two IK constraints on the same bone, with the first in the stack being disabled or zero-influence. Note that in the provided `Anime_Male_A.blend`, these two IK constraints appear (if I'm understanding the rig setup correctly) to be redundant, so the rig can be fixed by simply deleting the disabled IK constraint. The bug should still be fixed in Blender, of course. But in case this is currently blocking you, @IPv6

111553_minimal_repro.blend

850 KiB

👍 1

Nathan Vegdahl self-assigned this 2023-08-31 17:39:15 +02:00

Nathan Vegdahl commented

2023-09-18 10:57:18 +02:00

I'm un-assigning myself for now, because I have other stuff on my plate and am not actively working on this. It will still be on my todo, but if someone else wants to pick this up before I get to it, please feel free!

Nathan Vegdahl removed their assignment 2023-09-18 10:57:28 +02:00

Christoph Lendenfeld self-assigned this 2023-09-21 15:19:06 +02:00

Christoph Lendenfeld commented

2023-09-21 15:19:14 +02:00

going to have a look at this

👍 2

Christoph Lendenfeld referenced a pull request that will close this issue

2023-09-29 13:02:56 +02:00

Fix #111553: Double IK constraint not working #113056

Brecht Van Lommel referenced this issue

2023-09-29 15:56:26 +02:00

Fix #111553: Double IK constraint not working #113056