Joining two Soft Bodies (Cloths)

Questions
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1

I want to join (stitch) two cloth pieces together. I am using ammo.js for soft-body physics.
According to the bullet physics documentation, there is a function on the soft body named appendLink() by which the two soft bodies are constrained together. I tried that but nothing happened.

Any idea how this can be done? Any help is appreciated.

2

did you ever figure this out?

3

shows –
volumeSoftBody.appendAnchor( 0, obstacle1, false, influence );
— among other methods.