What's the best way to draw lines on a surface like this:



if I haven't been careful about orienting the cylinder and sphere relative to each other?



In other words, if isocurves on the sphere can't match up with those on the cylinder, how do I draw lines that smoothly flow from one face to another? I tried both a cline and a curve > line along the axis of the cylinder hoping that I could snap to the intersection between the cylinder axis and the surface of the sphere, but snapping to that point didn't pan out.

Consruct / Curve / Project? ;)

Hi Peer, yes like Pilou says Construct > Curve > Project or Construct > Curve > Intersect.

So for projection you would set up lines like this:



Select them, then run Construct > Curve > Project and select the object as the projection target:



re:
> hoping that I could snap to the intersection between the cylinder axis and the surface of the sphere, but snapping to that point didn't pan out.

Surface intersection can be an expensive operation so those snap points are not automatically calculated. But you can generate a point
object that you can snap on to between a curve and a surface by selecting them and running Construct > Curve > Intersect.

- Michael

Michael and Pilou,

Thank you both for helping me! This method worked perfectly.

And thank you Michael for telling me about construct > curve > intersect. That's good to know.