Tying a balloon to a brick with a string.

[hopbin9]

Hi,

I'm trying to figure out how to use a wire to hold a balloon to a brick. So that as the balloon blows in the wind the wire drags a brick along the ground.

I tried to pin constant a wire between a RBD sphere and RBD block, but the wire just stretches endlessly. I'm wondering if Houdini allows two RBD objects to interact with each other via a wire?

Thanks,

[hopbin9]

I've had no luck trying to figure this out. I can only assume that Houdini won't allow you to use wire as a constraint between two RBD objects.

Anyone know if this is documented somewhere in the manual?

[Dani F]

Hi,

I'm having the same problem right now and I was wondering if it's possible to make a constraint work bidirectionally between an RBD and a wire. Or if there's any other setup I could try.

Anybody?

Thanks.

[Dani F]

I've found that enabling "velocity per vertex" on the RBD collisions at the solver, and making a SBD spring constraint with mirror on, it does a kind of what I want. It doesn't seem very accurate altought, and the values to set on parameters are a bit crazy.

I'm wondering if this is the right approach anyway...

[hopbin9]

There is an example in the manual where they have it setup for a POP network and a RBD system to work together. So that the POP network has forces copied from the RBD collisions.

Maybe something like this would work. Where you can copy forces back to the wire.

[goldleaf]

I'm not sure how exactly to pull it off, but I've seen similar effects achieved by using lots of small constrained spheres or capsules to make up the rope, and having each end constrained to the brick or balloon.