Thanks for youe example. It was only example with those lines. I need Modo for retopo over 3d scans (5-10million polys). I`ve thought to import main features lines as curves to MoI but I can do this as subd polygon strips.

Hi Bartosh,

re:
> I would like to ask about second way (MoI->Modo). Why obj export can`t export MoI curve without surface
> as f.e. polyline?

Well, because it would be weird to do that, it's not supported by any programs to interpret an n-gon in an .obj file as if it was a curve.


> Of course I can do same trick in other way. Build surface only to cheat exporter and remove
> it in Modo to have polylines which can be coverted to curves

But this conversion doesn't work properly if I understand correctly. You're making a Catmull-Rom curve in Modo, the shape of the curve will be different than what it originally looked like in MoI.

Just taking the control points of a NURBS curve in MoI and then using those as the control points of a Catmull-Rom spline in Modo is not going to make the same curve shape.

Since Modo does not have a NURBS curve type in it, I don't really see how it's going to work to transfer a curve over to it without potentially weird mutations in shapes.

- Michael

Thanks, Michael for your effort to explain this differences with curve shape. I think I understood it.