Blender game engine importing .obj error i have some .obj model files, which i wanted to use for a game in Blender. Sadly there are some problematic issues. When i start the game engine, the model seems to be sort of inside out...? My first thought were normals, which are flipped or wrong otherwise, but even that doesn't seem to be the problem. In addition to that, i found out that this wrong look is only sometimes when i start the game player, not every time...

I really don't know what i am doing wrong here...

Here is a picture of how it should look like (the front at least):


And here is a picture from the wrong model (notice that i just started the game player again, i changed nothing...):


At the second picture you can see the bottom of the model from the inside or something. Sometimes you see like an overlapping kind of scenario...

Does someone know if this is just a bug or how i can fix it?

You can download the corresponding .blend file here:
http://www.mediafire.com/file/dqm8woo2nmo639a/Shiptest.blend/file

Thanks in advance!
The imported material is set as transparent. The selected transparency method, "Z transparency", give weird results if the object has internal geometry.

To fix this, in the material properties, uncheck "Transparency".