Alembic export animated vertex color exports only first frame vertex color #51488

New Issue

Yegor · 2017-05-13T18:33:36+02:00

Yegor commented

2017-05-13 18:33:36 +02:00

System Information
Debian, Nvidia GTX 1080ti

Blender Version
Broken: 2.78-58a0c275464 and the newest ones

Short description of error
When you create an animated vertex color on a mesh with dynamic paint for example, you expect it to be written into alembic while exporting it with vertex colors checked, but instead you have only first frame vertex color baked in it.

Exact steps for others to reproduce the error

Open attached blend file
Bake dynamic paint
Export abc with vertex colors checked
Import that abc file and have no animated vertex color

I'm also attaching that abc file.
Don't know if it's a bug or a thing to do, sorry.
alembic_anim_vertex_color.blend
alembic_anim_vertex_color.abc

**System Information** Debian, Nvidia GTX 1080ti **Blender Version** Broken: 2.78-58a0c275464 and the newest ones **Short description of error** When you create an animated vertex color on a mesh with dynamic paint for example, you expect it to be written into alembic while exporting it with vertex colors checked, but instead you have only first frame vertex color baked in it. **Exact steps for others to reproduce the error** 1. Open attached blend file 2. Bake dynamic paint 3. Export abc with vertex colors checked 4. Import that abc file and have no animated vertex color I'm also attaching that abc file. Don't know if it's a bug or a thing to do, sorry. [alembic_anim_vertex_color.blend](https://archive.blender.org/developer/F597534/alembic_anim_vertex_color.blend) [alembic_anim_vertex_color.abc](https://archive.blender.org/developer/F597540/alembic_anim_vertex_color.abc)

Yegor commented

2017-05-13 18:33:36 +02:00

Changed status to: 'Open'

Yegor commented

2017-05-13 18:33:36 +02:00

Added subscriber: @YegorSmirnov

Sergey Sharybin commented

2017-05-15 11:52:53 +02:00

Added subscribers: @dr.sybren, @Sergey

Sybren A. Stüvel was assigned by Sergey Sharybin

2017-05-15 11:52:53 +02:00

Sergey Sharybin commented

2017-05-15 11:52:53 +02:00

@dr.sybren, another one for you?

Yegor commented

2017-05-15 13:00:37 +02:00

By the way. It's not alembic export related perhaps, but the dynamic paint system itself. I could not find a way to bake animated vertex colors from dynamic paint onto object. Applying dynamic paint modifier simply leaves the first frame of vertex color baked. Deleting it leaves no vertex color at all. But i think alembic exporting should read the information about vertex color from the modifier per frame.

Sybren A. Stüvel commented

2017-05-23 12:36:14 +02:00

@YegorSmirnov can you test with 2.78c to see if this was ever supported? Then we know if it's a regression (i.e. a bug) or a new feature.

Yegor commented

2017-05-24 00:27:50 +02:00

Sybren, i have tested it with 2.78c official and since there was another bug in that release i reported, it's unable to export whole animation of the abc file with vertex colors checked. Blender exports only two frames of animation in that case. But even then those two frames have no vertex color animation. That two frames export bug is now solved in the trunk.
Anyway, it's not a regression. It's a lack of feature, i believe.

Sybren, i have tested it with 2.78c official and since there was another bug in that release i reported, it's unable to export whole animation of the abc file with vertex colors checked. Blender exports only two frames of animation in that case. But even then those two frames have no vertex color animation. That two frames export bug is now solved in the trunk. Anyway, it's not a regression. It's a lack of feature, i believe.

Jimmy Gunawan commented

2017-08-16 13:32:10 +02:00

Added subscriber: @BlenderSushiGuy

Jimmy Gunawan commented

2017-08-16 13:32:10 +02:00

I can confirm as for August 2017, no vertex color is exported with Alembic and kind of wish the vertex color can be baked for every frame. I tried using Sverchok, didn't work.

Philipp Oeser commented

2018-04-04 13:21:23 +02:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2018-04-04 13:21:23 +02:00

some (related?) info in #53745

Sybren A. Stüvel commented

2019-08-22 17:21:56 +02:00

This would indeed be a new feature and is not a bug. Updating the task properties to reflect this.

Joe Daniels commented

2019-10-12 01:58:48 +02:00

Added subscriber: @joedanimation

Christian Beckers commented

2020-05-28 15:42:43 +02:00

Added subscriber: @BeckersC

Sybren A. Stüvel removed their assignment 2021-01-14 18:03:00 +01:00

Pablo commented

2022-11-23 14:37:02 +01:00

Added subscriber: @OtherRealms

Pablo commented

2023-03-12 05:28:57 +01:00

I was able to export animated vertex colors to other software, however not without the help of some extra python. I had to add a pre and post frame handler, store the previous frames color attribute values and set them before and after evaluation for good measure, it only worked if the original mesh had exactly the number of verts/faces as after any geometry nodes (for animation of colors). These handlers run during the alembic export process. Also it helped to have two colour attributes, one for input(animation) and another for output(copy previous frame). Of course, the result is a frame behind. Would be good to have proper vertex colour animations support for everyone. It seems the exporter is trying to write colours from the pre-evaluated mesh?

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Alembic export animated vertex color exports only first frame vertex color #51488