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Copy Transform Constraint offsets the "Auto IK" (pose mode) bones in the chain #119590

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opened 2024-03-17 12:43:13 +01:00 by Adam Earle · 5 comments
Adam Earle commented 2024-03-17 12:43:13 +01:00
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System Information
Operating system: Windows-10-10.0.19045-SP0 64 Bits
Graphics card: NVIDIA GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 537.42

Blender Version
Broken: version: 4.1.0 Alpha, branch: main, commit date: 2023-11-25 22:37, hash: 1b6cd937ffc8
Worked: not > 4.0

Short description of error
When using a Copy Transforms constraint in combination with Auto-IK the bone position offsets after leaving the modal operation.

Exact steps for others to reproduce the error

  • Open the attached blend file a move the selected bone.
  • Upon confirming, it will end up in different position.

Changing the orientation of the Controller bone will change in which direction this offset occurs.

**System Information** Operating system: Windows-10-10.0.19045-SP0 64 Bits Graphics card: NVIDIA GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 537.42 **Blender Version** Broken: version: 4.1.0 Alpha, branch: main, commit date: 2023-11-25 22:37, hash: `1b6cd937ffc8` Worked: not > 4.0 **Short description of error** When using a `Copy Transforms` constraint in combination with Auto-IK the bone position offsets after leaving the modal operation. **Exact steps for others to reproduce the error** * Open the attached blend file a move the selected bone. * Upon confirming, it will end up in different position. Changing the orientation of the `Controller` bone will change in which direction this offset occurs.
blender_ww6041NzHt.mp4
17 MiB
bug_auto_ik.blend
854 KiB
Adam Earle added the
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 labels 2024-03-17 12:43:14 +01:00
Adam Earle commented 2024-03-17 13:23:47 +01:00
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Testing this further I have noticed that smaller movements when not rotating the "controller bone" doesn't key or keys the bone chain in unpredictable behavior.

The provided examples show:

  1. When Auto IK is enabled bones can't snap to 3D cursor.
  2. Snaping with auto Ik and the copy transform constraint leads to strange offset behavior of bones and cursor.
Testing this further I have noticed that smaller movements when not rotating the "controller bone" doesn't key or keys the bone chain in unpredictable behavior. The provided examples show: 1. When Auto IK is enabled bones can't snap to 3D cursor. 2. Snaping with auto Ik and the copy transform constraint leads to strange offset behavior of bones and cursor.
Failure - Bone snapping to Cursor.mp4
14 MiB
In correct keying and offset behaviour.mp4
21 MiB
Adam Earle commented 2024-03-17 13:26:26 +01:00
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Just linking this issue as well as I think they might all be related #119300

Just linking this issue as well as I think they might all be related https://projects.blender.org/blender/blender/issues/119300
Iliya Katushenock added the
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Animation & Rigging
 label 2024-03-17 13:44:11 +01:00
Richard Antalik commented 2024-03-17 20:30:08 +01:00
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I can reproduce, will modify a blend file a bit so it requires less steps to reproduce.

I can reproduce, will modify a blend file a bit so it requires less steps to reproduce.
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Richard Antalik added
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 labels 2024-03-17 20:36:40 +01:00
Sybren A. Stüvel removed the
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 label 2024-03-18 13:01:40 +01:00
Christoph Lendenfeld commented 2024-05-28 12:42:08 +02:00
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just started looking into this. This doesn't seem to be related to auto-keying but rather to the controller bone. If that has a transform the bone starts jumping. And it jumps into the direction of the controller bone rotation

Added an even simpler test file and provided a simple way to reproduce the issue

just started looking into this. This doesn't seem to be related to auto-keying but rather to the controller bone. If that has a transform the bone starts jumping. And it jumps into the direction of the controller bone rotation Added an even simpler test file and provided a simple way to reproduce the issue
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Christoph Lendenfeld self-assigned this 2024-05-28 12:42:15 +02:00
Christoph Lendenfeld changed title from Copy Transform Constraint offsets the "Auto IK" (pose mode) bones in chain when autokeying. to Copy Transform Constraint offsets the "Auto IK" (pose mode) bones in the chain 2024-05-28 12:50:12 +02:00
Christoph Lendenfeld commented 2024-07-09 11:41:31 +02:00
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stepping down for now since I wasn't able to fix that for 4.2

stepping down for now since I wasn't able to fix that for 4.2
Christoph Lendenfeld removed their assignment 2024-07-09 11:41:38 +02:00
Bart van der Braak added
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 and removed
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 labels 2024-08-14 13:03:17 +02:00
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Reference: blender/blender#119590
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