Alembic doesn't import vertex colors for meshes made of only vertices #109749
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Reference: blender/blender#109749
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System Information
Operating system: Linux-5.15.0-76-generic-x86_64-with-glibc2.35 64 Bits, X11 UI
Graphics card: NVIDIA GeForce RTX 3090/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 525.125.06
Blender Version
Broken: Version: 3.6.0, branch: blender-v3.6-release, commit date: 2023-06-27 08:08, hash:
c7fc78b81ecb
Worked: Never.
Short description of error
When importing Alembic caches, vertex colors are only imported correctly when the imported geometry is made of faces.
When the geometry is only vertices, no vertex colors are imported. (ex. point clouds)
I suspect this has to do with vertex colors encoded as a point attribute instead of a face corner attribute.
I've checked both provided alembic files in other software to make sure they're not the issue and they work fine everywhere else.
Exact steps for others to reproduce the error
points.abc
.Alembic doesn't import vertex type attribute vertex colorsto Alembic doesn't import vertex colors for meshes made of only verticesCan confirm. Not sure if this a limitation of Blender or it's just a situation that alembic importer fails to handle.
@ideasman42 or @dr.sybren may want to take a look
It seems alembic don't export attributes other than face-corner domain: #99293
Closing
Not sure why this was closed.
The referenced report is about export (and still open) and the closed report is about import?
Will check on this.
It is more of a TODO tbh, but will put on my desk
Got it working, now needs a bit of cleanup and discussion in regards to
CD_PROP_BYTE_COLOR
vs.CD_PROP_COLOR
(atm. this is alwaysCD_PROP_BYTE_COLOR
and the data in the file looks like that as well, not sure if alembic can do differently as well?)kVaryingScope
-- notkVertexScope
-- atm. I only check the data size, if it is the same length as we have vertices, the attribute is created on the vertex domain...)Thanks for looking in to this so quickly.
For reference, both alembics were exported from Houdini with default settings. I can have a look at the export options there if there's anything you'd like to know.
OK, so apparently we have a much more generic solution in the works (at least for USD), see #109518, will try to coordinate this to have the alembic counterpart (not yet sure if alembic supports all of what USD does) coming along with the same features.
Sorry, will step down to not block others on this matter (as I feel the way to go forward would be something more generic like #109518)