Is there an easy way to model a 3D heart shape?

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I want to model a heart shape in 3D with as little code needed as possible and without using external model files.

In 2D, I can use some Bézier curves to draw a heart shape, and I could extrude this to get a simple 3D heart shape, but this doesn't look like the shape I want. The bottom of the heart should be a peak, the upper part should be two rounded parts (well, I guess you know what I mean).

So, is there an easy way to model such a shape in 3D (i.e., a simple formula or a small code snippet)?


This page at MathWorld had some nice material. Although mostly in 2D it did show a couple of 3D shapes too. It has a link to this page, which seems very promising.