Hi Rogurt, thanks for posting the file.

> A projection of a spline drawn in sideview (cyan) will not
> give good results neither on the forefoot nor on the
> other side.

I get a result that looks like this:



Can you maybe describe what is not good about those results, nothing appears bad there to me with just an initial look over it.

Note that in the project command since the curve you are projecting is not planar, you will need to place 2 points inside the command to define the projection direction. Usually it is easier to project planar curves, but your curve kind of bends and is kind of warped in 3D instead of being a planar curve.

You can make it planar by selecting it and squishing it flat using one of the corner edit frame grips until you get "flat snap", see an example here:
http://moi3d.com/forum/index.php?webtag=MOI&msg=3378.4

- Michael

Thanks a lot guys.

The shape of the resulting part is asymmetrical in real word so a simple projection did not do. Meanwhile I tried with drawing a freeform curve "through control points" with just surface snap on. Setting the points with care one gets a result with not too many control points and it will trim the basic shape of the shoe properly.

With your method I would have to make three parts and connect them. If the projected ends do not meet each other a 100% I would have quite a hard time adjusting since there are so many points. At least my first testing with this method was not that fun.

Michael, I had a look at the blue path and saw that the ends are not intersecting either. This is why I did not bother checking for that with the orange. But now I will do so...

Cheers
Rogurt

I took Danny's isect curves a step further and created a network patch surface that would yield the point structure of the "projection curve". This allows me to match both sides of the surface independently to recreate a curve iscet in a surface.....

Tried that also but it gave me quite a hard time on the forefoot area. I think I´ll stay with painting a new path directly onto the surface "through points" and "snap on surface".