Solution Crystal Growth: Diffusion-Limited Aggregation (2D)

This 2D companion drives the same subject as the 3D lab — crystal growth from a supersaturated solution — through a real diffusion-limited-aggregation (DLA) engine rather than a scripted scale-up animation: individual solute particles enter the fluid on a ring around the crystal and random-walk, cell by cell, until they either wander back into solution or land beside the lattice, where they attach with a probability set by temperature and supersaturation. A six-fold anisotropy slider biases that attachment probability toward six crystallographic directions, turning the same underlying rule from a smooth compact disk into a branching, faceted dendrite — visibly showing why hot, dilute solutions tend to grow slow, compact crystals while cold, saturated ones grow fast, spiky ones.