Double sided polygon texturing

[Maa]

I have double sided polygons on cabin of my Tatra 813 8x8.
How can I switch between sides whitch will be textured with background texture?

[HuBBa]

Afaik there are no such thing as double sided polygons. You have to copy the polygons and then flip them ie. creating new polygons. At least i think BIS said that in an earlier post.

/HuBBa

[Gen.Carnage]

to do so:

select the polygon(s), press ctrl-c, press ctrl-v, press w once.