Why does this work:



isosurface {
        function {
                (2*x^2+y^2+z^2-1)^3 - (0.1)*x^2*z^3-y^2*z^3

        }
        threshold 0
        accuracy 0.0001
        max_gradient 20
        max_trace 2
        contained_by { sphere { 0, 7 } }
        pigment {
                color Grey
        }
}

but not this:


#declare Heart =
    function {
                (2*x^2+y^2+z^2-1)^3 - (0.1)*x^2*z^3-y^2*z^3
    }

isosurface {
        function {
                Heart(x, y, z)

        }
        threshold 0
        accuracy 0.0001
        max_gradient 20
        max_trace 2
        contained_by { sphere { 0, 7 } }
        pigment {
                color Grey
        }
}

TIA

5k.

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