Aaaannd....
my initial instinct seems to be right.

Commenting out that equation for a sphere ... gets rid of the sphere.

No idea why they have that in there - r isn't redefined in any of the other
sections.

     #else
          #declare r2 = max (abs(r2), abs(Y));
          //#declare r = sqrt(X*X + Y*Y + Z*Z);  <<< comment out

 #end

I'd say if someone can recompile their source code with that one line edited
out, and see if the isosurface for that function works fine without it, then

"It's a bug".


(I think that my preceding post still has some valid points, because there's the
selection that takes place between r and r2 - and r2 is dependent on Thickness.
So although the sphere is a result of the redefinition of r, the value of r2
influences the appearance of that sphere.

Hope that makes some sense.

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