> Can anybody help me with a formula for either a catenary of even a
parabola
> whose curve has a vertex of  <0,-150,0> and has X intercepts of <X,0,0>
with
> X being a variable?

Have you tried a spline, using a sphere sweep?

spline {
    cubic_spline
    X + 4 //X being non control, non starting/ending points
    <0, -200, 0> // Control Point
    <0, -150, 0> // Starting Point
    ... // More points
    <0, 150, 0> // End Point
    <0, 200, 0> // Control Point
}

sphere_sweep {cubic_spline} // Needs some more parameters, cant think of
them at the moment

Hope this helps :-)

Lieut_Data

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