constraint object to animated

[abanoub]

i got a hand animated box and i want to make constraint between this box and fractured sphere via glue or hard constraints , the idea is the sphere should follow the box until some force or collision object break some constraints and the free pieces fall down while the rest follow the box 

 

EX: the plane and big pieces are hand animated and the small pieces are constrainted and moveing accordingly 

 

 

 

[DennisSchmidt]

To create the constraints between the two objects scatter a large amount of points on the both surfaces and create a name for A and B. Merge those two and do the standard connect adjacent pieces sop. You should see only points in the connection area. Play a bit with the search radius. Now transfer the original name of the objects back to the constraintpoints. Now you should have working constraints for the connection between your fractured sphere and the box(only the touching pieces).
I'm not quite shure about hard constraints breaking by force but glue definitely only breaks upon impact.
Hope it helps.

Dennis

[abanoub]

thanks Dennis for the reply

but the issue is how to make object "A"(active) sticks to object "B"(animated is sops) by the constraints until some impact happens

 

constraint anim to dops.hip

[anim]

if you can animate your objects after packed, so that you can use Animated Static Objects option in RBD Packed

and don't animate your constraints in SOPs

constraint_anim_to_dops_fix.hip

[abanoub]

thanks Tomas , its a good tip

but what if the animation is done before the packed or (most scenarios) imported from Maya as alembic ?

[anim]

I'd imagine in most scenarios the plane geometry imported from maya would still have transform on each packed alembic object so it should work with no problems

I'd try to avoid unnecessarily interpreting objects as deforming unless they really deform

[abanoub]

OK that's make sense , and it works now , Thanks 

[ZeitG]

Hey guys.

A has download an exapmle of Tomas, it's good. But what if my starting frame does not equals to 1. So I had changed my Simulation Start frame to different frame and in constraint network / overwrite with SOP does not change value to 0 at second / third etc sim frame. And I get in my sim something like a "double transformation" by constraints. How to cure it?

Many Thanks!

[magicU]

Ha! After spending two days fighting with Houdini to make this work, then giving up this afternoon & doing it all with Maya's ncloth it's heartening to see this isn't actually too difficult to get working after all. Now do I go back to Houdini in the morning? hahaha

Thanks Tomas