When driven IK influence change, ik animation have 1 frame delay #52835

New Issue

Hazuki Aoi · 2017-09-19T18:05:59+02:00

Hazuki Aoi commented

2017-09-19 18:05:59 +02:00

System Information
Win10
GTX-1050Ti

Blender Version
Broken: 2.79 5bd8ac9
Worked: (optional)

Short description of error
When IK influence change, ik animation have 1 frame delay
And this delay will be exported

Exact steps for others to reproduce the error
1.The IK Bone influence is driver from another bone
and on the first NLA or frame influence is 0.

2.Hold Alt and scrolling mouse wheel move to next frame.Or press Right Arrow Key move to next frame.The IK target moved and IK Bone have not change.
first frame:

next frame:

3.Export FBX with NLA

4.Import Unity

5.Error blender file and fbx
error.7z

**System Information** Win10 GTX-1050Ti **Blender Version** Broken: 2.79 5bd8ac9 Worked: (optional) **Short description of error** When IK influence change, ik animation have 1 frame delay And this delay will be exported **Exact steps for others to reproduce the error** 1.The IK Bone influence is driver from another bone and on the first NLA or frame influence is 0. ![image.png](https://archive.blender.org/developer/F825380/image.png) 2.Hold Alt and scrolling mouse wheel move to next frame.Or press Right Arrow Key move to next frame.The IK target moved and IK Bone have not change. first frame: ![image.png](https://archive.blender.org/developer/F825412/image.png) next frame: ![image.png](https://archive.blender.org/developer/F825418/image.png) 3.Export FBX with NLA ![image.png](https://archive.blender.org/developer/F825428/image.png) ![image.png](https://archive.blender.org/developer/F825431/image.png) 4.Import Unity ![image.png](https://archive.blender.org/developer/F825443/image.png) ![image.png](https://archive.blender.org/developer/F825441/image.png) 5.Error blender file and fbx [error.7z](https://archive.blender.org/developer/F825447/error.7z)

Hazuki Aoi commented

2017-09-19 18:05:59 +02:00

Changed status to: 'Open'

Hazuki Aoi commented

2017-09-19 18:05:59 +02:00

Added subscriber: @hazukiaoi

Sergey Sharybin commented

2017-09-21 09:49:51 +02:00

Added subscriber: @Sergey

Sergey Sharybin commented

2017-09-21 09:49:51 +02:00

Changed status from 'Open' to: 'Archived'

Sergey Sharybin closed this issue

2017-09-21 09:49:51 +02:00

Sergey Sharybin self-assigned this 2017-09-21 09:49:51 +02:00

Sergey Sharybin commented

2017-09-21 09:49:51 +02:00

The IK Bone influence is driver from another bone

This isn't supported by old dependency graph. You need to explicitly enable new dependency graph using --enable-new-depsgraph command line argument.

Thanks for the report, but it's a known limitation of old depsgraph.

> The IK Bone influence is driver from another bone This isn't supported by old dependency graph. You need to explicitly enable new dependency graph using `--enable-new-depsgraph` command line argument. Thanks for the report, but it's a known limitation of old depsgraph.

Hazuki Aoi commented

2017-09-21 10:02:39 +02:00

I try todo this and the error still here

I try todo this and the error still here ![image.png](https://archive.blender.org/developer/F844963/image.png)

Sergey Sharybin commented

2017-09-21 10:07:56 +02:00

Are you showing a result of roundtrip of exporting scene from blender to fbx and back to blender?

Sergey Sharybin commented

2017-09-21 10:39:08 +02:00

Changed status from 'Archived' to: 'Open'

Sergey Sharybin reopened this issue

2017-09-21 10:39:08 +02:00

Sergey Sharybin removed their assignment 2017-09-21 10:39:08 +02:00

Bastien Montagne was assigned by Sergey Sharybin

2017-09-21 10:39:08 +02:00

Sergey Sharybin commented

2017-09-21 10:39:08 +02:00

Added subscriber: @mont29

Sergey Sharybin commented

2017-09-21 10:39:08 +02:00

@mont29, maybe you can deduct something here already?

Bastien Montagne changed title from ~~When IK influence change, ik animation have 1 frame delay on export FBX~~ to When driven IK influence change, ik animation have 1 frame delay

2017-09-21 10:56:10 +02:00

Bastien Montagne removed their assignment 2017-09-21 10:56:10 +02:00

Sergey Sharybin was assigned by Bastien Montagne

2017-09-21 11:02:31 +02:00

Bastien Montagne commented

2017-09-21 11:02:31 +02:00

Added subscriber: @JoshuaLeung

Bastien Montagne commented

2017-09-21 11:02:31 +02:00

This has nothing to do with FBX at all, issue is with Blender update somehow. When you move frame forward between both NLA strips shown in pictures above, the right arm of the character does not follow the (now 1.0 influencing) IK target. Going to next frame, or switching to Edit mode and back, updates it correctly.

@Sergey re-assigning to you, since this is probably an update (depsgraph) issue (missing relation? wrong order, like IK constraint being evaluated before its driven influence is?), but maybe @JoshuaLeung has some idea here too? Note that usual tricks (extra object/data updates) do not seem to work here…

This has nothing to do with FBX at all, issue is with Blender update somehow. When you move frame forward between both NLA strips shown in pictures above, the right arm of the character does not follow the (now 1.0 influencing) IK target. Going to next frame, or switching to Edit mode and back, updates it correctly. @Sergey re-assigning to you, since this is *probably* an update (depsgraph) issue (missing relation? wrong order, like IK constraint being evaluated before its driven influence is?), but maybe @JoshuaLeung has some idea here too? Note that usual tricks (extra object/data updates) do not seem to work here…

Sergey Sharybin commented

2017-09-21 11:09:07 +02:00

@mont29. did you test that with new depsgraph enabled?

Bastien Montagne commented

2017-09-21 12:05:50 +02:00

@Sergey, yes, tested with both old and new depsgraph, with and without extra updates in both cases, none worked (old depsgraph has different behavior than new one when going backward, though, but neither is correct in that case either).