Always the same! :)
Export to Affinity V1 for have only separated closed curves (or surfaces ) for any 2D design!
seems Aff V2 resolves now from no closed curves...(as shown on my previous video)
https://moiscript.weebly.com/uploads/3/9/3/8/3938813/fullsizerender.mov

It's legitim to have from any 3D view of a mechanical piece from a 3D prog only faces visible for any graphic post production...

In fact a sort of internal Contour Silhouette for each surface...

Hi Pilou, for the circles that you showed above:
http://moi3d.com/forum/index.php?webtag=MOI&msg=10957.27

Those circles are holes. The nature of a hole is that there isn't anything in it, so it would be kind of strange to fill in those.

- Michael

Yes but its was just for take something and give the possibility in Aff 1 to fill anything...

I believe i can make something like this: Moi Export PDF "Project view 3D"
then reload this PDF inside MOi = i have a Plane of the visible wire!
General Trim by a Plane = i have each zone as a surface
Rest to find something who surrond each surface by a curve!

to be continue...

maybe this from the above! :)
Explode Move = free surfaces in the space
Select Edges and move them = I have only closed Curves !
UnMove
UnExplodeMove
Export PDF

here just export PDF for see if the closed curves works! :) (before the UnExplodeMove)
Filling in Aff 1 works now like a charme!


I believe i am near an easy process! :)

Tips
Better if the original objects are Boolean Union and generator vertical line of Cylinder hidden

The complete easy final Process! :)
Of course each closed curve can be Style colorized and Named inside Moi!
for have directly named Layers inside Affinity V1! (no made here)

With this http://moi3d.com/forum/index.php?webtag=MOI&msg=3334.2
you can name automatically some Styles (so futur Layers) as you want
for have something more elaborated than "Default" following! :)
( Calque = Layer in French)

Intersection with a plane of the Imported PDF






else i have refound a Close Multiple Curves Command :)
https://moi3d.com/forum/index.php?webtag=MOI&msg=2752.1