Warp <war### [at] tagpovrayorg> wrote:
> I haven't looked at the solution. This is what I'm thinking:
.....
>   Is this correct?

Yes. (I'll presume that you asked instead of checking the solution link because
you would want to keep working on it if the solution were otherwise.)
Note: the original post also contains a link to a demonstration (not by me) that
the problem IS solvable, should anyone wish to confirm the statement.

BTW, nice explanation.

Best Regards,
Mike C.

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