Thousands of points drifting through a noise flow-field, additively lit.

Four thousand points seeded through a shallow volume, each advanced every frame by sampling a cheap analytic noise field at its own position — a true flow field, so neighbouring particles follow neighbouring streamlines and the swarm develops visible currents rather than jittering independently. Vertical wrapping recycles points that drift out of frame, keeping density constant. Additive blending with depth-write disabled means overlapping points accumulate into bright cores. Half the swarm is lime, half amber, fixed at build.