hi,
my first post here 
small question from an unity n00b :roll:
i have made a tent in 3DSmax using the plane. exported as .3ds file and put in the assets map.
when i import the tent in unity it works great except the plane. i can only put an texture on the outside. but when i walk inside the tent the plane is transparant. how can i texture both sides?
need this to be done in unity or in 3DSmax? and how?
It needs to be done in 3DSMax, I’ve never used it so I don’t know the exact menus/buttons to do so but you have to export the plane as a two sided mesh.
I’m pretty sure even then, most default shaders in unity are only set to render the front faces of a polygon. You could go in add a flag to your shader to render both (i don’t personally know how) or duplicate the geometry in 3dsmax that needs to be visible on both sides and reverse the normals.
wow that is fast 
i shall try to find how to export the two sided mesh
There is a list of links in this thread:
http://forum.unity3d.com/viewtopic.php?t=16570&highlight=backface