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Heribert Raab avatar image
Heribert Raab asked ·

alembic procedural does use not velocity for motion blur

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?

proceduralsmotion blur
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Heribert Raab avatar image
Heribert Raab answered ·

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.

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Julian Hodgson avatar image
Julian Hodgson answered ·

See an example file from our test suite: alembic_vel.zip


alembic-vel.zip (213.8 KiB)
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it works in gaffer but not in Houdini.

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Heribert Raab avatar image
Heribert Raab answered ·

default alembic SOP, the alemebic file has v attr if reload it in houndini and unpack it...
does it have be renamed to "velocity" ?

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Ashley Handscomb Retallack avatar image
Ashley Handscomb Retallack answered ·

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?

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