IK with non uniform scale broke the animation tools #51971
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Reference: blender/blender#51971
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Blender Version
Broken: 2.78
Worked: 2.77
Non uniform transforms generated by the ik constraint cannot be used by blender operators: Apply visual transform to pose, Animation bake, Copy Attribute, FK/IK snap, none of them will work
Exact steps for others to reproduce the error
Attached blend file contains a very simple ik setup, and a copy with a baked animation, which behaves different. Baking the animation, applying to pose, storing the matrices and setting them, will not end up with the same pose.
This happens since non uniform scale IK has been introduced, and it's fixed disabling USE_NONUNIFORM_SCALE at build time
ik-stretch.blend
Changed status to: 'Open'
Added subscriber: @PaoloAcampora
Added subscribers: @icappiello, @LucioRossi, @dragostanasie, @ideasman42, @mont29, @BrendonMurphy
Added subscriber: @Sergey
Not that familiar with this feature, it is implemented by @campbellbarton.
Campbell, mind having a look here?
This issue was referenced by
f05f2f0336
Added subscriber: @brecht
I think D2088 changed two things:
ik-stretch.blend
, but not necessarily the reason the scripts and tools are broken.There's a few different scaling cases:
ik_non_uniform_scale.blend
from D2088. This can probably be fixed without breaking the scripts and tools described in this ticket. P513 is an attempt at that but isn't quite right in all cases.hi, we need some resolve here, people are waiting for this to be fixed.
Thanks
Sorry I could not dig into coding, busy days. The way I see it, if there is interest in keeping this feature but there is no way to make sure it behaves properly, it should definetely be an optional setting. This way the user can willingly activate non uniform scaling, and renounce the benefit of the animation tools in exchange.
In order to do this, we would need
pose.ik_param
to return a parameters class rather than a None, even when the solver is set to legacy, so some work would be required on the rna and of course on properties_data_armature.pyRegards
Changed status from 'Open' to: 'Resolved'