I tried to render a 3D version of the quadrifolium
(http://mathworld.wolfram.com/Quadrifolium.html)
but my first try of a 3D variant of its formula does not work. So I
changed the formula arbitrarily and got a nice object, see attachment.

Do anyone know a common name of this nice thing? :-)

		Lars R.


-----<snip>-----
isosurface
{
// does not work:
//	function { pow(x*x + y*y + z*z  , 3) - 12 * x*x * y*y * z*z }

// works and looks interesting:
        function { pow(x*x + y*y + z*z  , 3) - 12 * x*y*z }
        contained_by { box{ -1,+1 } }
        accuracy 0.001
        max_gradient 100


        pigment { color rgb<0.3,0.6,0.9> }
        finish { phong 0.1 reflection 0.2 }

        rotate y*30
}


light_source { <-3,6,-9> color 1
        area_light <0.5,0,0>, <0, 0.5, 0>, 4,4 jitter
}

//light_source { <1,9,-2> color 0.4 }

box
{
        <-9.9,-9.9,-9.9> , <+9.9,+9.9, +9.9>
        pigment { checker color rgb 0.5 color rgb 0.77 }
}

camera
{
        location <0,5,-9>
        look_at <0,0,0>
        angle 20.3
}

-----<snap>-----

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