# Metaballs v2 — Marching squares

Marching squares live: the field sampled on a grid, every 2×2 cell classified into one of 16 cases, and the interpolated iso-line stroked around the blobs.

Source: https://steevepommier.com/motion/metaballs-v2-marching-squares/
Section: Motion
Published: 2026-07-07
Tags: 2d, interactive, iridescent

---

The centrepiece of the article: sample the field on a grid, classify every 2×2
cell into one of 16 cases and stroke the iso-contour, with optional linear
interpolation of the crossing points. Toggle the grid, the inside/outside
sample dots and the source balls to see exactly how the algorithm works.