how to Draw a three-dimensional curved line? (for creating tubes)

[Anonymous]

Hi!

I have a problem in creating the sketch for creating the paths for four tubes.

the problem is that I don't want to draw those paths on a planar plane, because I need four tubes that follows that shape of a sphere.

I am attaching a video in which I have identified the the beginning and the end of the tube with the mouse pointer.

I understood that it is not possible to draw a sketch on a non-planar surface, but is there another way for doing what I need?

Thank you very much

[Anonymous]

here is the video

[davebYYPCU · Accepted solution]

Couple of ways to do it,

3d splines, create a 3d sketch, draw a 3 or more point spline to connect each end, and adjust the flow.  You can / need to move the spline points and handles with the move tool.

or create two sketches in 2d, top and side view,  then create 3d sketch and use project > Intersection curve.

Might help...

[Anonymous]

thank you very much!

I did not get how to use the intersection curve thing... but I will find it out

[davebYYPCU]

Nearly midnight, 

will check in the morning see if your stuck, can do a screencast movie for the intersect curve. I have one that is unlisted, just need an edit and will attach it.

[harry.doldersum]

Just what I needed - thanks. 🙂