TheMightyZog wrote:

> The following is a U shaped pipe and I would like the inside to be White and
> the outside Yellow.  How can I do it?

Model the geometry both for the inside and the outside (your
pipe is bound to have some physical thickness), and make the
actual object the "difference" of outside - inside. To avoid
numeric problems (coincident surfaces), the "inside" pipe
should a bit longer than the "outside" pipe.

Depending on your geometry, you can often get away with using
a scaled down copy of the outer shape for the inner shape.

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