Me again,
just little changes in the formulas, I delete all pi and the torus is 
better.

#declare F1= function(u,v) 
{sin(u)*(7.0+cos((u/3.0)-(2.0*v))+2.0*cos((u/3.0)+(v))) };
#declare F2= function(u,v) 
{cos(u)*(7.0+cos((u/3.0)-(2.0*v))+2.0*cos((u/3.0)+(v))) };
#declare F3= function(u,v) { sin((u/3.0)-(2.0*v))+2.0*sin((u/3.0)+(v)) };


Lionel.
-- 
Do not judge my words, judge my actions.

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