MetaballsField

◊ Brief

A handful of moving spheres render as additive radial gradients with a soft alpha falloff. Their fields blend into one continuous iso-surface that visually approximates classic metaballs without the marching-squares overhead.

• balls8
• radius range90 — 190 px
• max speed80 px/s
• cursor bump160 px

§README

1. §01True metaballs require an iso-surface threshold over a sampled scalar field — that's expensive to do at full canvas resolution every frame. The radial-gradient approximation costs the same as drawing N alpha disks and visually reads identically once the gradients are tuned.
2. §02Cursor adds a bright white-cored bump that mixes with the underlying balls without affecting their motion.