https://www.youtube.com/watch?v=yxtI0XlBghQ&feature=youtu.be [youtube.com]
this is a simple RBD test create by thinkingParticle. just gave it a spin with custom axis.
how do it with RBD or RBD parked? I know RBDparked can control like particle, but have no idea how to give a spin force with a custom axis? and if I want apply spin force only when colliding?

I'm very interesting in parked object, hope someone can give me a help!
cheer!

You mean packed RBD??

I want apply spin force only when colliding?

You can use glue constrain.

I know RBDparked can control like particle, but have no idea how to give a spin force with a custom axis?

You can use cross product for that.

Hi Pradeep

You mean packed RBD??

yes.

You can use glue constrain.

excuse me, you mean I can use glue to get impact data? may I ask more detail?

as you said, I use cross to calculating rotate axis in 3dsMax TP. but don't know how to give spin force in Houdini. now I'm trying use torque attribute in POPVOP dop but it seen difficult to control…

try using a vopforce dop to apply torque. To apply torque to only colliding objects, group them.

-G

thanks Ranxerox : D
ok, finally my two problem both solved. I use primnum to trace which pack piece collided and add to a new group with sopsolver. my way is a little complex and stupid. hope we have more smart way to do detective collision.