In article <GqstUBAz6c$AFwBa@econym.demon.co.uk> , Mike Williams 
<nos### [at] econymdemoncouk>  wrote:

> I believe that POV still calculates A B and C twice. It certainly takes
> quite a bit longer to render the surface when it's written this way than
> when you write

You can "use" the sum/prod functions to create temporary real variables.

    Thorsten

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Thorsten Froehlich, Duisburg, Germany
e-mail: tho### [at] trfde

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