alembic procedural does use not velocity for motion blur, instead, Arnold tries to create its motionblur, which it mess because of changing point count. if write ass files it works, it take v attr for motionblur.
if i unpack and load into Houdini the alembic Arnold take v for motionblur, but it takes much more to the first pixel. that's why i wanna use almebic procedurals.
is it a bug or feature?
The alembic procedural should use velocity data if it is in the archive. How are you exporting the data? Are you exporting with the velocity data in the alembic?
default alembic SOP, the alemebic file has v attr if reload it in houndini and unpack it...
does it have be renamed to "velocity" ?
of coursce i am exporting velocity data. renderman and octane gets it. even gaffer and arnold works, but htoa has issues to use velocity in alembic files.