Hi MO,

Thanks for the feedback.

I'm going to have to study what you have done - it looks a bit complicated but it works a treat.

While waiting for feedback I asked Google AI about the issue and it came back with a solution using vector math that works, at least for simple lines, which is what I tested it with.

I don't know if that approach will work for the 3DM file I posted here, with the arms representing real world objects, as opposed to simple lines.

See attached.

Frederick