Physics Simulation Forum

hi,
I am trying to simulation skirt on a skinned model. But I don't know how to create the skirt by bullet. SoftBodyHelp::createFromPatch() can only create rectangle cloth, right? but i want to create a skirt which is more complex than a rectangle patch.
Then I try to use softBodyHelp::createFromTriMesh(), but the cloth dispears when the application steps into the simulation loop. I check the solved vertex positions , and find thart they are invalid.

So, Can anyone tell me how to create the skirt by bullet?
Thank you .