Auto IK not working #56990

New Issue

Artur Tavares · 2018-10-01T09:53:39+02:00

Artur Tavares commented

2018-10-01 09:53:39 +02:00

System Information
Windows 10
i7 4790K
16 gb RAM
GTX 970

Blender Version
Broken: 2.8 Aplha 2 2018-09-24 20-26
Worked: 2.79

Short description of error

Grabbing bones and bone handles not working as previously in Blender 2.79. When you grab them, they rotate in a weird way, and after you release the bone, it teleports to another location/rotation

Exact steps for others to reproduce the error

Grab bone handles(IK) and move them around(G key). when you move the hand, the rest of the arm moves(at least in 7.9, due to constraints)
You will notice the grab action does not work as expected, the bone only rotates around a nonsense axis, instead of rotating around its head.
The bone rotates in a weird way, and the other bone does not follow it(bone with constraint), the mesh does not deform too, until the point you release the bone in the new location. The mesh affected by the bone that is connected to the moved bone deforms while you move it. When you release it in place, the whole arm moves.

Observations:
When you move a handle that should move a deformation bone, It only rotates, and their child moves. The weird thing is that the deformation bone does not follow the handle properly in this case. The handle goes ahead of the bone that copies its rotation.

Videos with the behavior

2.79
bandicam 2018-10-01 04-35-22-110.mp4

2.8
bandicam 2018-10-01 04-35-52-922.mp4

Blend file:

Porl3.blend

**System Information** Windows 10 i7 4790K 16 gb RAM GTX 970 **Blender Version** Broken: 2.8 Aplha 2 2018-09-24 20-26 Worked: 2.79 **Short description of error** Grabbing bones and bone handles not working as previously in Blender 2.79. When you grab them, they rotate in a weird way, and after you release the bone, it teleports to another location/rotation **Exact steps for others to reproduce the error** 1. Grab bone handles(IK) and move them around(G key). when you move the hand, the rest of the arm moves(at least in 7.9, due to constraints) 2. You will notice the grab action does not work as expected, the bone only rotates around a nonsense axis, instead of rotating around its head. 3. The bone rotates in a weird way, and the other bone does not follow it(bone with constraint), the mesh does not deform too, until the point you release the bone in the new location. The mesh affected by the bone that is connected to the moved bone deforms while you move it. When you release it in place, the whole arm moves. Observations: When you move a handle that should move a deformation bone, It only rotates, and their child moves. The weird thing is that the deformation bone does not follow the handle properly in this case. The handle goes ahead of the bone that copies its rotation. Videos with the behavior 2.79 [bandicam 2018-10-01 04-35-22-110.mp4](https://archive.blender.org/developer/F4888823/bandicam_2018-10-01_04-35-22-110.mp4) 2.8 [bandicam 2018-10-01 04-35-52-922.mp4](https://archive.blender.org/developer/F4888824/bandicam_2018-10-01_04-35-52-922.mp4) Blend file: [Porl3.blend](https://archive.blender.org/developer/F4888714/Porl3.blend)

Artur Tavares commented

2018-10-01 09:53:39 +02:00

Added subscriber: @artutava

Artur Tavares changed title from ~~Bone copy rotation constraint not working as in 2.9~~ to Bone copy rotation constraint not working as in 2.79

2018-10-01 10:00:33 +02:00

Philipp Oeser commented

2018-10-01 10:54:53 +02:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2018-10-01 10:54:53 +02:00

Looks like an issue with Auto IK in 2.8 (file from the report is using it [see Pose Options] but video shows it being used in the FK scenario of the rig-- if I turn this off FK seems to behave as expected, if you slide the rig properties to IK and use the IK controler, this also seems to behave as expected...)

Anyways, will have a quick look at the code now...

Looks like an issue with `Auto IK` in 2.8 (file from the report is using it [see Pose Options] but video shows it being used in the FK scenario of the rig-- if I turn this off FK seems to behave as expected, if you slide the rig properties to IK and use the IK controler, this also seems to behave as expected...) Anyways, will have a quick look at the code now...

Artur Tavares commented

2018-10-01 12:28:33 +02:00

Yep. Tested here. Disabling auto ik makes it work, but works without auto ik.

Campbell Barton was assigned by Philipp Oeser

2018-10-01 14:56:16 +02:00

Philipp Oeser commented

2018-10-01 14:56:16 +02:00

Added subscriber: @ideasman42

Philipp Oeser commented

2018-10-01 14:56:16 +02:00

took a bit of digging, but seems to be caused by a typo in 5d628c519b.
@ideasman42: D3751 should fix it?

took a bit of digging, but seems to be caused by a typo in 5d628c519b. @ideasman42: [D3751](https://archive.blender.org/developer/D3751) should fix it?

Philipp Oeser changed title from ~~Bone copy rotation constraint not working as in 2.79~~ to Auto IK not working

2018-10-01 14:56:49 +02:00

Campbell Barton was unassigned by Philipp Oeser

2018-10-01 15:11:05 +02:00

Philipp Oeser self-assigned this 2018-10-01 15:11:05 +02:00

blender-admin commented

2018-10-02 02:10:26 +02:00

This issue was referenced by 60d4d58376

This issue was referenced by 60d4d583760cb3317968546406eba1da3d6330c8

Campbell Barton commented

2018-10-02 02:12:08 +02:00

Changed status from 'Open' to: 'Resolved'

Campbell Barton closed this issue

2018-10-02 02:12:08 +02:00

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Auto IK not working #56990