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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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