> Well the white outline is easy, it's just a slightly thicker version
> of the object drawn bigger and further away (I have a macro
> for building my object that takes thickness as a parameter).

Ok... that won't work though if there is something in the scene
to reflect your object.

> The black outline is a cunning trick: I use a thicker object
> (so it completely encloses the coloured object, and every
> point on the surface of the thick object is a fixed distance
> from the inner object), then I colour it with texture
> { pigment { rgbt 1 } } interior_texture { pigment { rgb 0 } }.
> This gives a good
> outline.

Wow!  That is cunning and I think it will work for what I
want to do too.

Thank you so much,
Carl

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