I have another question...
See, I was playing around with isosurfaces and created one for making a
cylinder:

isosurface {
  function {sqrt(x*x+z*z)-1}
        threshold 0
        accuracy 0.001
        max_gradient 4
        contained_by{sphere{0,2}}
        pigment {rgb 1}
}


Pretty simple stuff.
The thing is, that if I enclose the function sqrt(x*x+z*z)-1 with the abs()
command...

isosurface {
  function {abs(sqrt(x*x+z*z)-1)}
        threshold 0
        accuracy 0.001
        max_gradient 4
        contained_by{sphere{0,2}}
        pigment {rgb 1}
}


The cylinder is not shown anymore!
I just don't get it...
If the result of sqrt(x*x+z*z)-1 is 0, when I find the absolute value of it, it
should still be 0... and if it's any other value, it shouldn't matter, as when I
find the absolute value of it it would not be 0 anyway...
So the isosurface should exist in the same area that the one without the abs()
command. Or not?
I need some help here, as I'm trying to create some more complex isosurfaces
using the abs() command, and I can't get on it if I still can't understand how
isosurfaces work...
I thought that if you take any point inside the isosurface's container, replace
the x, y and z values in the function for the values of the point, and the
result of the operation is equal to the threshold, the isosurface exists in that
point...
Is that correct?

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