Ok, looks like I’m almost there. Apex work separately, but it’s fine. I created additional bones for a curtain and now it’s kinda interacting.
Physics behaves really weird though, I have no idea for a while how to make it non stretching. I managed to constrain top bones in place, but the ones below stretch and act weirdly. Does anyone know what settings should I change?
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PS. Nothing seems to work, physics just act super weird - stretching and flying around in phat. My scale is in order, there are only few bones, I played with settings too, nothing helps.
Here is a video showing the problem and also asset files - .fbx and apex file for it. Maybe if you could take a look, you could tell what’s wrong with it?

