Copy Location constraint from bendy bone shows crazy jiggle behaviour in linked proxy rig. #51047

New Issue

Anna Celarek · 2017-03-24T00:03:04+01:00

Anna Celarek commented

2017-03-24 00:03:04 +01:00

System Information
Windows 10, GeForce GTX 950M

Blender Version
Broken: 2.78b, 12b62b5

Short description of error
See the files:
stretch.blend contains a rig with a bendy bone "A", its custom handle references "tangent_A1" and "tangent_A2" (used to control and animate it), and a bone "Bone" with Copy Location constraint set to the middle of the bendy bone.
linked.blend contains the same rig linked as proxy. Both tangent bones are animated.
"Bone", instead of sticking to the middle of "A", jiggles around like crazy (no proper update) when scrubbing through the timeline.

The problem appears only when the bone layers are protected.
When I append the action back to the original rig file, everything works fine.

Exact steps for others to reproduce the error
Download both files into the same folder, open link.blend and scrub through the timeline.
stretch.blend
linked.blend

**System Information** Windows 10, GeForce GTX 950M **Blender Version** Broken: 2.78b, 12b62b5 **Short description of error** See the files: stretch.blend contains a rig with a bendy bone "A", its custom handle references "tangent_A1" and "tangent_A2" (used to control and animate it), and a bone "Bone" with Copy Location constraint set to the middle of the bendy bone. linked.blend contains the same rig linked as proxy. Both tangent bones are animated. "Bone", instead of sticking to the middle of "A", jiggles around like crazy (no proper update) when scrubbing through the timeline. The problem appears only when the bone layers are protected. When I append the action back to the original rig file, everything works fine. **Exact steps for others to reproduce the error** Download both files into the same folder, open link.blend and scrub through the timeline. [stretch.blend](https://archive.blender.org/developer/F521072/stretch.blend) [linked.blend](https://archive.blender.org/developer/F521073/linked.blend)

Anna Celarek commented

2017-03-24 00:03:04 +01:00

Changed status to: 'Open'

Anna Celarek commented

2017-03-24 00:03:04 +01:00

Added subscriber: @AnnaCelarek

Anna Celarek commented

2017-04-18 12:29:07 +02:00

The problem persists in 2.78c and today's dayly build 4d0d1b5

The problem persists in 2.78c and today's dayly build 4d0d1b5

Luca Rood commented

2017-07-03 14:28:52 +02:00

Added subscribers: @mont29, @LucaRood-3

Bastien Montagne was assigned by Luca Rood

2017-07-03 14:28:52 +02:00

Luca Rood commented

2017-07-03 14:28:52 +02:00

Seems in your area @mont29.

Bastien Montagne commented

2017-07-03 17:04:33 +02:00

Added subscribers: @Sergey, @JoshuaLeung

Bastien Montagne commented

2017-07-03 17:04:33 +02:00

This is evaluation issue… Some notes:

Looks like if the differential movement between two frames was applied twice. That’s why constrained bone goes back to its place after few frames without any movement.
With old depsgraph, enabling Extra Data Update for the proxy and the instancing group fixes the issue.

Maybe @Sergey or @JoshuaLeung will have ideas, before I dive too deep in that nightmare?

This is evaluation issue… Some notes: * Looks like if the differential movement between two frames was applied twice. That’s why constrained bone goes back to its place after few frames without any movement. * With old depsgraph, enabling `Extra Data Update` for the proxy and the instancing group fixes the issue. Maybe @Sergey or @JoshuaLeung will have ideas, before I dive too deep in that nightmare?

Demeter Dzadik commented

2019-08-03 01:41:13 +02:00

Added subscriber: @Mets