Bill Hails <bil### [at] europeyahoo-inccom> wrote:
> #macro transform_vector(V, T)
>     #local S = sphere { V, 1 transform T }
>     #local Min = min_extent(S);
>     #local Max = max_extent(S);
>     ((Min + Max) / 2)
> #end

  How about using vtransform() from transforms.inc instead?

-- 
#macro M(A,N,D,L)plane{-z,-9pigment{mandel L*9translate N color_map{[0rgb x]
[1rgb 9]}scale<D,D*3D>*1e3}rotate y*A*8}#end M(-3<1.206434.28623>70,7)M(
-1<.7438.1795>1,20)M(1<.77595.13699>30,20)M(3<.75923.07145>80,99)// - Warp -

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