>   Another possibility is to use interior_texture.
Yes, that is a more general solution. I considered mentioning it in my
reply but if the roof is a closed mesh rather than just being a thin
tent shape it won't have the desired effect. In this case,
interior_texture won't suffice for what tahoma calls "backface textures"
either, and it would also be necessary to give the vertices on the top
and those on the bottom (of the roof) different textures (and
interior_texture s) too.

Daniel

-- 
Now  as he walked by the sea  of Galilee,  he saw  Simon and Andrew  his
brother casting a spam into the net:  for they were phishers.  And Jesus
said unto them, Come ye after me, and I will make you to become phishers
of men.  And  straightway  they forsook  their  nets,  and followed him.

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