Double sided Faces issues when imported into Blender

[Prey]

If it’s any help, I believe this person had the same issue and fixed it:

OBJ Import problem: double sided polygons that share vertices

Hi there, I have the following problem. I am importing an obj that has double sided faces with the following setup: v 0 0 2 v 0 0 0 vn 0 -1 0 vn 0 1 0 g two_polygons f 1//1 2//1 3//1 (uses vn 3) f 1//2 3//2 2//2 (uses vn 2) so the obj has two faces, with opposing normals, sharing the vertex points. When I import this into blender, only one of the two faces survives. How can I preserve the second polygon? is there a way to change the obj importer to create the second face with unique ve…

However, he didn’t share how.