http://img138.imageshack.us/img138/7113/conewithflattip.png [Broken](adsbygoogle = window.adsbygoogle || []).push({});

Help needed, I need an expression of the figure in the picture, it is like a conic but the tip is not a point but a short 1D segment (it s not a truncated conic), I accept anything ;-) skewed Conics, Sperical Harmonics approx, cubic surface..... any suggestion?

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# An expression for this figure

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