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Attach a trolley case (RBD) to an animated alembic character

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tomtm
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Hi
it sound very simple, but I really can't find out how I can pin or attach a trolley case to an
animated alembic mesh. How could I attach the RBD Pin constraint to the mesh?

Is there a tutorial showing me the concept. It could also be a truck trailer who is pulled from the truck.

Many thanks
Tom
Edited by tomtm - 2021年8月4日 19:00:02
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tomtm
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I tried it with a glue-adjacent constraint, but then, the alembic character has to be at least something RBD too.
I don't think this solution is the real way to go. I have a blackout.

I attached the hip with the alembic and my "solution"... :-)

I'm sure, Houdini has some much better ways to do this.

Any modification are welcome.

Attachments:
Character_Walk.zip (5.2 MB)

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tamte
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here is one way

Attachments:
RBD_Pin_fix.hiplc (749.1 KB)

Tomas Slancik
FX Supervisor
Method Studios, NY
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tomtm
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tamte
here is one way
Hi Tamte,

thank you a lot for your approach. I appreciate it very much.
It's strange, that there isn't something much more easy implemented. I guess it's a common case to
pin RBD to something that drags.

Anyway, I have to study it first.


Thank you
Tom
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tamte
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its partially due to how Bullet works
as naively you could just have constraint to world with updated anchor position within the solver based on the position on the mesh, but that wouldn't be updated within proper Bullet substeps and would just cause instability

so constraining to animated rbd is more proper approach
Tomas Slancik
FX Supervisor
Method Studios, NY
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