There are pathological cases when the doubling method is practically impossible.

I wonder... Would it be difficult to implement separate textures for the two
sides of a surface? I.e. when the surface normal is >90 degrees from the current
ray, use one texture - and when <90 degrees use another. Sound simple, at least
in principle.

Margus

Ron Parker wrote:
> 
> Seriously, there is another way to get different textures on both sides
> of a sheet of paper, but it's a little more difficult.  It requires
> you to use a radial texture, and it requires the paper to have at least
> a little thickness so as to prevent weirdness in the texture.  If you're
> using a patch object for the paper, I think I'd recommend doubling it
> up as previously suggested.

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