Help How to drag a rope from any point of the rope

[wakin001]

I created a rope, and when I touch the rope and need to drag it from the touch point.

I can get the touch point on the rope, but how can I drag it?

I added an ObiParticleAttachment on the ObiRope, and I try to find the control point near my touch point, but I found all control points are the same and will never change, after changing the position of the rope.

So can I find the correct control point in runtime?