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I am trying to understand the marching cubes algorithm. I would like very much an easier definition of an isosurface than what is available online. Could anyone please explain it?

Thanks.

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isosurface is the locus of constant value of some function. –  Sasha Aug 4 '11 at 16:26
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Would it help if we replace "isosurfaces" by "contours"? In the same way that a usual contour map plots vertical two-dimensional "slices" of a three-dimensional surface, isosurfaces would be the three-dimensional slices of some higher-dimensional function. –  J. M. Aug 4 '11 at 16:26
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