Alembic: object constraints animation no longer exported #71986

New Issue

Steffen Dünner · 2019-11-27T23:09:13+01:00

Steffen Dünner commented

2019-11-27 23:09:13 +01:00

System Information
Operating system: Linux-5.3.13-050313-generic-x86_64-with-debian-buster-sid 64 Bits
Graphics card: GeForce GTX 1080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 440.33.01

Blender Version
Broken: version: 2.82 (sub 2), branch: master, commit date: 2019-11-27 20:26, hash: 4659fa5471
Worked: 0a3f0e64c9 from a few days ago, Blender 2.81, Blender 2.80 and Blender 2.79

Short description of error
Objects parented to curves using the "Follow Path" command are animated along the path and should be therefore exported to Alembic. This stopped working a few commits ago it seems. I suspect one of this one: https://developer.blender.org/rBf18ad385dffe70f5e57df00ff9bbb7b42fa05be0

Exact steps for others to reproduce the error

Add a cube
Add a path
First select the cube then the path
Press CTRL + P to parent the cube to the path and select "Follow Path"
Check in the timeline the cube is animated during the first 100 frames
Export to Alembic
Import the Alembic to Blender (I also tried Houdini) -> no animation

I also attached a very simple blend file containing above objects:

Follow_Path_v01.blend

**System Information** Operating system: Linux-5.3.13-050313-generic-x86_64-with-debian-buster-sid 64 Bits Graphics card: GeForce GTX 1080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 440.33.01 **Blender Version** Broken: version: 2.82 (sub 2), branch: master, commit date: 2019-11-27 20:26, hash: `4659fa5471` Worked: 0a3f0e64c9d2 from a few days ago, Blender 2.81, Blender 2.80 and Blender 2.79 **Short description of error** Objects parented to curves using the "Follow Path" command are animated along the path and should be therefore exported to Alembic. This stopped working a few commits ago it seems. I suspect one of this one: https://developer.blender.org/rBf18ad385dffe70f5e57df00ff9bbb7b42fa05be0 **Exact steps for others to reproduce the error** - Add a cube - Add a path - First select the cube then the path - Press CTRL + P to parent the cube to the path and select "Follow Path" - Check in the timeline the cube is animated during the first 100 frames - Export to Alembic - Import the Alembic to Blender (I also tried Houdini) -> no animation I also attached a very simple blend file containing above objects: [Follow_Path_v01.blend](https://archive.blender.org/developer/F8173185/Follow_Path_v01.blend)

Steffen Dünner commented

2019-11-27 23:09:14 +01:00

Added subscriber: @SteffenD

Philipp Oeser commented

2019-11-28 11:21:16 +01:00

Added subscribers: @dr.sybren, @lichtwerk

Philipp Oeser commented

2019-11-28 11:21:16 +01:00

This is true for all constraints.

@dr.sybren: I assume this is more of an oversight than a design decision?
Would personally think constraints should be baked [since their relationship is not going to be recreated on import], thus would consider this a high priority...

This is true for all constraints. @dr.sybren: I assume this is more of an oversight than a design decision? Would personally think constraints should be baked [since their relationship is not going to be recreated on import], thus would consider this a high priority...

Philipp Oeser changed title from ~~"Follow Path" Animation no longer exported to Alembic~~ to Alembic: object constraints animation no longer exported

2019-11-28 11:22:02 +01:00

Sybren A. Stüvel self-assigned this 2019-11-29 12:52:49 +01:00

blender-admin commented

2019-11-29 14:09:16 +01:00

This issue was referenced by e7c7707ca9

This issue was referenced by e7c7707ca9a876f123511b548a742ca9373e19b9

Sybren A. Stüvel commented

2019-11-29 14:09:40 +01:00

Changed status from 'Open' to: 'Resolved'

Sybren A. Stüvel closed this issue

2019-11-29 14:09:40 +01:00

Sybren A. Stüvel commented

2019-11-29 14:32:44 +01:00

Thanks @SteffenD for doing the digging and making it so easy to fix :)

Steffen Dünner commented

2019-11-29 15:33:57 +01:00

:) You're welcome. Thanks for taking care of this.

I can confirm that constraints animations are now exported to Alembic. The bad news is that the "Follow Path" case still doesn't work (in build 4feced2f3e, so the fix should be included).
The blend file I attached to this report is not exporting the animation.

:) You're welcome. Thanks for taking care of this. I can confirm that constraints animations are now exported to Alembic. The bad news is that the "Follow Path" case still doesn't work (in build 4feced2f3e5a, so the fix should be included). The blend file I attached to this report is not exporting the animation.

Sybren A. Stüvel commented

2019-11-29 15:53:15 +01:00

Changed status from 'Resolved' to: 'Open'

Sybren A. Stüvel reopened this issue

2019-11-29 15:53:15 +01:00

Sybren A. Stüvel commented

2019-11-29 15:53:15 +01:00

@lichtwerk The path following isn't a constraint, and I missed this 'nuance' while reading the rest of the task due to the changed title.

Philipp Oeser commented

2019-11-29 16:03:28 +01:00

@dr.sybren, @SteffenD : sorry about this, in a rare exception to the rule I did not open the report file in this case, but checked from scratch in my own file [brain was mistakenly throwing in the constraint instead of the parent relationship...]
[nice side-effect: we've now got the constraints case covered as well :)]

@dr.sybren, @SteffenD : sorry about this, in a rare exception to the rule I did not open the report file in this case, but checked from scratch in my own file [brain was mistakenly throwing in the constraint instead of the parent relationship...] [nice side-effect: we've now got the constraints case covered as well :)]

blender-admin commented

2019-11-29 16:30:10 +01:00

This issue was referenced by 9ea0eb0b95

This issue was referenced by 9ea0eb0b950f498b2bda91f137fce7c961eb08f5

Sybren A. Stüvel commented

2019-11-29 16:37:41 +01:00

Yeah, well, I rolled back the original change. It causes too much of a headache right now.

Sybren A. Stüvel commented

2019-11-29 16:45:55 +01:00

Changed status from 'Open' to: 'Resolved'

Sybren A. Stüvel closed this issue

2019-11-29 16:45:55 +01:00

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Alembic: object constraints animation no longer exported #71986