Hi Rogurt,

Your shoe's surface shape is very irregular, the projection result would be different form one side to the other, you would have to have a slightly different shape spline for each side, I'm not sure what your after exactly but you could try and extrude a surface from the cyan spline into the shoe as shown in the picture below, then you turn on the control points of the spline, manipulate the control points and the extruded surface will update that way you can see what's going at the shoe surface, once you're satisfied run Construct > Curve > Isect which will give you an intersection curve between the two surfaces it's the same as doing a Project but more visually manual way.



> Maybe you can also give me advice on why
> the basic object (blue) can be done with MOI
> network command with the splines I imported
> from a rhino file (green) but not with the
>splines I created in MOI (orange)

Your orange spline set up isn't that clean if you zoom up to the areas circled in the picture you can see why....



Circled #1: This cross spline doesn't quite make an intersection, turn on your control points and you can move the end point to create an intersection.



Circled #2: Here you'll have to trim the curves as well as move control points to tidy up this intersection.



Once you've cleaned up those two areas Network should work.



Cheers

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".