Operating system: Linux 4.19.0-10-amd64 #1 SMP Debian 4.19.132-1 (2020-07-24) x86_64 GNU/Linux
Graphics card: NVIDIA Corporation GM107GL [Quadro K2200] (rev a2)
Short description of error
I work with Alembic files which contain Meshes that may have constant geometry but varying vertex colors.
Importing an Alembic file containing such data only creates a MeshSequenceCache on the Meshes that have geometry changes.
The missing Meshes are created and their first Frame is imported. Manually adding MeshSequenceCache modifiers with the correct object-paths to them yields the expected result.
It seems to me like there is some optimization that prevents the creation of MeshSequenceCache modifiers on Meshes with constant geometry without considering if they have other animated properties.
Exact steps for others to reproduce the error
- Import the attached Alembic file using the "Import->Alembic (.abc)" operator.
- Observe that the correct Objects have been created but that the MeshSequenceCache modifier has only been applied to "Contour1"
- Manually create a MeshSequenceCache modifier on one of the objects, add the alembic file as the source file and select the correct "Object Path" (The same as the name of the object).
- Observe that the vertex colors on that object are now animated correctly.