Complaints by Steph
Seems for the Import OBJ that Moi gives Normal's facetts of "Open surface" transformed in Poly in impredictable result !
So does it possible to see the normals of Poly Surfaces (by color (?) and possibility to click on them for inverse it before export?

You can say take an another Poly prog for make that,
but seems that Moi Smooth Phong is very "complex"
and the other poly progs have many difficulties for manage this problem !

A new challenge ? :)
PS Or use an algorithm for make "Open surface" artificially like "Closed surface" for have Normal to the external?