Err... Every time I read a mathematical problem like this I feel kind of
stupid... Am I correct in assuming that you want to calculate the surface
normal of a triangle, whose vertices are given?
If so, try this (untested and you migh have to swap V2 and V3)

#macro Norm(V1,V2,V3)
    vnormalize(vcross(V2-V1,V3-V1))
#end

If not, I might still have the solution but I dont quite understand what you
need...

Margus

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