Double-side plane?

[micheus]

vershner, I just took a look at the engine and it has a very nice look.

I also found this information bellow in their Steam Community - Beginner Modders Q&A:

Modelviewer
Questions about the Modelviewer Tool
:
5. Q: Why are some parts of my model not visible in the game or are visible from the wrong side?
A: If the face is invisible from both sides, that means you used an alpha texture. If it is visible from one side, but not the one you want it to be visible from, that means that you have to flip normals in your 3D program, because the game doesn’t support textures visible from both sides.

Protip: A simple fix in blender is to select the face menu and solidify the area you wish to make dual faced.

In this case, that suggested Solidify in Blender is equivalent to Extrude in Wings3D.

I believe you will need to set a small amount of thickness to not let the faces overlapping, but also without make perceptive the double mesh (like 0.0001).