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Syntax:
object {
texture { TEXTURE_ITEMS... }
interior_texture { TEXTURE_ITEMS...}
}
All surfaces have an exterior and interior surface. The
interior_texture simply allows to specify a separate texture for the
interior surface of the object. For objects with no well defined
inside/outside (bicubic_patch, triangle, ...) the interior_texture is
applied to the backside of the surface.
Interior surface textures use exactly the same syntax and should work in
exactly the same way as regular surface textures, except that they use
the keyword interior_texture instead of texture.
Note: Do not confuse interior_texture {} with interior {}:
the first one specifies surface properties, the second one specifies volume properties.
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