That being said, we could add a check in should_visit_dupli_objectfor dupli_object->particle_system, but since the intentions are unclear, I would rather have @Sybren A. Stüvel (sybren) comment on this.
If the system is set to render as object, yes, those duplis should be exported. If the system is set to Halo, then only points.
Afaict, those duplis actually should not be exported at all.
Particle export should be animated points, thats it.
Can confrim, will check.
Fri, Apr 2
Thu, Apr 1
Vertex interpolation option introduced in rBbab2260b59c7: Fix T71981: Alembic vertex interpolation can jumble mesh was defaulting to ON (correct) in that commit, but was lost in rB83980506957c: Use DNA defaults system for modifiers
So if you have a file that was (incorrectly) imported with a version after rB83980506957c you'll have to enable Vertex Interpolation option on every MeshSequenceCache modifier by hand.
Mon, Mar 22
Mar 8 2021
Mar 2 2021
Mar 1 2021
Can confirm the behavior.
Feb 24 2021
Ok, sorry again this took a bit to answer, but I can confirm.
Feb 19 2021
Sorry this has been lying around, will have another look soonish
Feb 16 2021
Feb 7 2021
Feb 1 2021
I think this contains all you need to investigate this
To speed up the the triaging process as much as possible, it would be good to have a minimal example case with just one source instance (duplicated a couple of times) to reduce complexity.
In the meantime, we would at least need the source .blend file (where the .abc was exported from).
This ensures we are all on the same page and reduces setup time if multiple devs are looking at this.
Jan 20 2021
Jan 15 2021
Jan 14 2021
Jan 8 2021
@Sybren A. Stüvel (sybren): this also passes the alembic tests:
Jan 6 2021
Not sure why you added @Sybren A. Stüvel (sybren) as reviewer here though? AFAIK he is neither UI nor Modifier team member?
Dec 29 2020
It my fault ... It seems that Alembic can will not remerber the group that with no faces in the first frame.
It's time to close the task
Dec 22 2020
Could you share one of those .abc s?