Hundreds of unwanted splines created in export of 2D or 3D docs when opened in Autodesk or Rhino

When I export a simple flat shape into 2D (using DXF format), or when I export the 3D SKP file and people try to open it in Autocad or Rhino, they end up with hundreds and sometimes more splines all over, the contour line gets all cut up in hundreds of lines - regardless of it all being welded already.

Is it possible this only happens because the “profile” option is DEACTIVATED in the edge style section of the view menu ???

It would be great if that was all there is to it. I pray to God that it’s only that.

If not, does anyone know what else it could be ?

This screenshot is from Rhino, the first one was from Autocad.

What happens if you import the SketchUp file into Rhino directly? Rhino can open and write SKP files.
SketchUp has no real spline curves, segments are all there is. SketchUp models in Rhino are all mesh geometry, not curves or quads.

I honnestly don’t know what happens on the other end cause it’s partners working with me that open the SKP files and the DXF files, and I was told that others send them the same file format and half the time there is no problem. So that’s why I’m thinking it might have something to do with an option somewhere that’s activated or not, and it would make sense that it could be related to the “profile” option in the edge style I think. What do you think ? If it’s not that, what else could it be ?

Not likely as this is just a 3D display style. Probably ignored by other applications on import.
Definitely not a property that has an equivalent in DXF.

I asked Chat GPT for a solution, with the same exact information as I put here.

He explained thoroughly what to do, and I must say he is becoming an extremely helpful friend.

Long live AI.

Lately I spent half the time with Copilot pointing out its mistakes and every day I have to tell it to stop asking me personal questions.

and he said what ?

Not a good idea, it doesn’t have the right answers in cases like this, yet.

The problem is that Rhino and sketchup are different kind of softwares for 3D modeling, in Rhino a circle is a circle in sketchup a circle is a polygon set by default with 24 sides you can increase the number of sides to make it look rounder, the same with arcs and any kind of curves, rhino uses nurbs so a curve is just a curve if you import a Bézier curve it won’t be recognized as a curve it will be recognized as a lot of segments, Wen you import faces it will triangulate them.