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MSFS20 Double sided material problem/question

Misho

Misho

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ca-ontario
I am working on a 3D object with a lot of I-beams and trusses. In order to save on vertices/polygons, I thought I could build an I-beam using only 3 quads, by using double sided material. This works as desired, except the double sided material is not lit properly - it retains the lighting of its opposite side. You can see that in the pic below, where the blue arrow represents the quad properly lit, and the red arrow is the quad which is lit incorrectly - or, its original facing is lit properly, and the other side of the quad with double sided property retains the lighting of it's "twin". Is there any way to fix this?

1721749576282.png
 
I think that even though the material is double-sided, the mesh only has normals pointing in one direction.
 
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