Snowflake Dendritic Growth — 2D Ice Crystal Habit Simulator

A snow crystal's shape — thin plate, hollow column, needle or branching star — is decided by how fast water vapor can diffuse onto its six hexagonal faces, and that balance flips repeatedly as temperature drops. This simplified 2D top-down simulator runs a lightweight hexagonal diffusion automaton and renders each frozen lattice site so its habit is visible directly in the fill pattern, letting you steer the crystal across the real Nakaya diagram with temperature and supersaturation sliders while panning and zooming freely around the growing lattice.