> but this does not work in povray, does it?

If I understand you correctly, you want to do something like this (code 
from shapes.inc):

#macro Isect(Pt, Dir, Obj, OPt)
    #local Norm = <0,0,0>;
    #local IPt = trace(Obj, Pt, Dir, Norm);
    #if (vlength(Norm) > 0)
       #declare OPt = IPt;
       #local Return=true;
    #else
       #local Return=false;
    #end
    (Return)
#end

HTH,
Florian
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