Double-side plane?

[micheus]

I didn't create it. It was downloaded from from free3d.com. I imported it as an obj.

If you import this object in your game, does it looks correctly?
If yes, maybe what you are doing with it on Wings3D before export it again is causing the issue.

The best option would add the link to the .obj file for the foliage you are using and then I can better understand what you are experiencing.

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Just to show how this kind of object should look on Wings3D bellow is a example (leaves-texture.wings).

I used a pentagon face for my leaf for convenience, it was extracted and then I get a flat object with two faces sharing the same vertex.

In this case, we UV segment the object selecting the edges and marking them for cut. After unfold the mesh we have the two faces in the AutoUV window which one is the front and other is the back.
By having a prepared texture image we just need to correctly align then over the respective painted images:




* the black area on image is the transparency (the .png alpha channel)