> Maybe we could find a mathematical proof for the correctness or 
> falseness...

I guess the interpolation is a linear operator (not to be confused
with linear splines; any spline type I know is a linear operator),
say I. Then linearity says that

   I(x+y/256)=I(x)+I(y)/256.

Hence it is irrelevant whether you interpolate or compose first.


-- 
merge{#local i=-11;#while(i<11)#local
i=i+.1;sphere{<i*(i*i*(.05-i*i*(4e-7*i*i+3e-4))-3)10*sin(i)30>.5}#end
pigment{rgbt 1}interior{media{emission x}}hollow}//  Mark Weyer

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