Matthew Pace <mat### [at] lycoscom> wrote:
> 1) Wouldnt just a plane show up?  y equals 0 on only one plane, doesnt 
> it?

  By default POV-Ray will take any point which is *inside* the isosurface
as the surface of the object. This means that if the surface of the
container object is inside the isosurface, it will show up.
  You can use "open" to stop it from doing this.

> 2) If y is negative, why is the positive part of the sphere shaded?

  Because it makes the check -y<0, which is the same as y>=0.

-- 
#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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