In article <3c59b30e$1@news.povray.org>, TAl### [at] yahoocom says...
> function {sqrt((x*y)^2+(y*z)^2+(z*x)^2-3)}

I don't know why this doesn't work, but moving that -3 out of the sqrt 
makes it work, without changing the shape much.

Lutz-Peter

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