Drawing a spline on to projected geometry

[Anonymous]

Hello!

If I have projected geometry on to a 3D sketch, I realize that this isn't representing physical features, it is just theoretical projection of geometry from another part of the assembly.

However, how do I then convert this if I have complex geometry that can't be re-drawn? Can I "trace" the projection with a spline or sweep somehow?

See the attached example, this is a very simple version of what I'm referring to... I have a bunch of lines projected on to a cylinder side, but I want to then actually draw that path on to the cylinder. I need to work from projected geometry, and then I can unwrap this and have a 2D path.

Any suggestions? Thank you!

[Anonymous]

At the moment we are using sweep to do this, then flattening and projecting the peak of the sweep to a 2D surface to have a single line path. I think this will work... but is there a simpler way?