Adding pole target to IK chain makes IK ignore limits set further up the chain #28313

New Issue

Peter Schulman · 2011-08-21T13:56:45+02:00

Peter Schulman commented

2011-08-21 13:56:45 +02:00

%%%Scroll timeline in attached .blend file to see what's up.

armatureA and armatureB are otherwise the same, only B has a pole target set for the IK constraint on bone2. Rotation limits set on bone2 are handled correctly on both armatures (neither is ever completely straight, because X rotation is limited), but on armatureB, limits set on bone1 are ignored.%%%

%%%Scroll timeline in attached .blend file to see what's up. armatureA and armatureB are otherwise the same, only B has a pole target set for the IK constraint on bone2. Rotation limits set on bone2 are handled correctly on both armatures (neither is ever completely straight, because X rotation is limited), but on armatureB, limits set on bone1 are ignored.%%%

Peter Schulman commented

2011-08-21 13:56:45 +02:00

Changed status to: 'Open'

Brecht Van Lommel commented

2011-08-22 13:57:39 +02:00

%%%It's a known limitation of this option, see here:
http://www.blender.org/development/release-logs/blender-246/inverse-kinematics/%%%

%%%It's a known limitation of this option, see here: http://www.blender.org/development/release-logs/blender-246/inverse-kinematics/%%%

Brecht Van Lommel commented

2011-08-22 13:57:39 +02:00

Changed status from 'Open' to: 'Archived'

Brecht Van Lommel closed this issue

2011-08-22 13:57:39 +02:00

koil commented

2014-02-18 20:16:12 +01:00

Added subscriber: @koilz

koil commented

2014-02-18 20:16:12 +01:00

I was wondering if this bug could be reopened, or added to the new todo list on the wiki, or a explaination to why it cant be fixed.
I recently found this bug or limitation a problem while rigging.

Some reasons to IK lock the final chain bone:

Prevent a finger from spinning on the Y axis.
Prevent shoulder joint from spinning on the Y axis.

Old wiki reference seems to be gone: http://wiki.blender.org/index.php/Dev:Ref/Outdated/Release_Notes/2.46
New file with same problem: ik_pole_lock.blend Problem is documented in the Text Editor.

With an IK bone constraint, the last bone in the chain cannot be XYZ locked if using a pole target.

I was wondering if this bug could be reopened, or added to the new todo list on the wiki, or a explaination to why it cant be fixed. I recently found this bug or limitation a problem while rigging. Some reasons to IK lock the final chain bone: * Prevent a finger from spinning on the Y axis. * Prevent shoulder joint from spinning on the Y axis. Old wiki reference seems to be gone: http://wiki.blender.org/index.php/Dev:Ref/Outdated/Release_Notes/2.46 New file with same problem: [ik_pole_lock.blend](https://archive.blender.org/developer/F77991/ik_pole_lock.blend) Problem is documented in the Text Editor. With an IK bone constraint, the last bone in the chain cannot be XYZ locked if using a pole target.

Henning Roos commented

2017-10-23 20:59:19 +02:00

Added subscriber: @Hinnyboy

Henning Roos commented

2017-10-23 21:10:06 +02:00

Changed status from 'Archived' to: 'Open'

Henning Roos reopened this issue

2017-10-23 21:10:06 +02:00

Henning Roos commented

2017-10-23 21:10:06 +02:00

Why is this issue ignored? Please revisit this issue.

Brecht Van Lommel commented

2017-10-23 21:22:23 +02:00

Changed status from 'Open' to: 'Archived'

Brecht Van Lommel closed this issue

2017-10-23 21:22:23 +02:00

Brecht Van Lommel self-assigned this 2017-10-23 21:22:23 +02:00

Brecht Van Lommel commented

2017-10-23 21:22:23 +02:00

Please do not reopen old bug reports.

There is no particular reason this feature can't be implemented, it just takes quite a bit of work. For requesting features like this, see here:
https://wiki.blender.org/index.php/Dev:Doc/Contact#Requesting_Features

Please do not reopen old bug reports. There is no particular reason this feature can't be implemented, it just takes quite a bit of work. For requesting features like this, see here: https://wiki.blender.org/index.php/Dev:Doc/Contact#Requesting_Features

Sign in to join this conversation.

No Label

Download

What's New

Blender Studio

Manual

Developers Blog

Documentation

Benchmark

Blender Conference

Development Fund

One-time Donations

Adding pole target to IK chain makes IK ignore limits set further up the chain #28313