Editing Metaballs (section)

== Definition ==
Each metaball is defined as a [[function (mathematics)|function]] in ''[[Natural number|n]]'' dimensions (e.g., for three dimensions, <math>f(x,y,z)</math>; three-dimensional metaballs tend to be most common, with two-dimensional implementations popular as well). A thresholding value is also chosen, to define a solid volume. Then,

<math display="block">\sum_{i} \mbox{metaball}_i(x,y,z) \geq \mbox{threshold}</math>

that is, all points larger than the threshold are inside the metaball.