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Any suggestions how to approach this issue?

Hello!

I've been using Houdini for a couple of months now and I've been trying to make a bridge tool. I've almost completed it but I've come across an issue.

I'm trying to have the rope sit on the supports and follow the curve as the user moves the bridge. The rope follows the curve if you move it left to right but becomes offset if you move it up and down.

I've tried using a copy to point which normally would work but due to my set up as I'm using some VEX to set the up, side and N vectors as the direction for the planks and supports.

Just curious if anyomne ahs any suggestions on how to approach this issue?