Well, i try to change color with  vector's comparison. Subtraction , or equal
can't give a result to change color.
And  substraction (Pos_-Pos_compare) can't be recognize. I want to change color
when the two vectors are the same, in substraction equal to 0 ,=0.
I use trace() for one vector.

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#declare PointA = VEq(Pos_,Pos_compare);


sphere{Pos_,.25
 #if (0=PointA)
 pigment{White}
#else
 pigment{Gray30}  #end }


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Thanks so

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