Simply, I could not resist;)

isosurface {
    function { f_result2(x,y) }
    contained_by { sphere { <0,0,0>,5 } }
    threshold 0.75
    max_gradient 1000
    pigment { color Cyan }

    rotate <60,0,0>
    scale 5
}


Since the functions given by And are constant in direction z, with an 
isosurface the container will limit the functions in this direction. So, 
I thought a sphere would look better than a box as container.

Best regards
Michael

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