Why can I see through a box in blender game engine? I have a problem where I can see through a box in blender game, see picture. This effect changes so that the near side of the "chassis" of the truck is invisible when I rotate the model



What can I do to not make this happen?
The normal (1) of the invisible face points in the wrong direction you can fix that by selecting the face and Ctrl-N.

You can verfiy this by displaying the normals (2)
Alternatively you could disable Backface Culling in the material's Game Settings (3).