💎 Geometry Painter — three.js WebGPU

Paint geometry directly onto a hyper-real floating sphere. Drag a stroke across the surface and watch it come alive — the first painting mode grows crystal veins: clusters of refractive quartz points that pop out of the surface along your stroke.

Built on the same surface-painting foundation as VegetationGeneratorThreeJS, redesigned around an extensible mode system — every painting mode consumes the same strokes and returns a living instance the app grows, animates, undoes and rebuilds uniformly. More modes (coral, circuitry, feathers, …) plug in without touching the painting plumbing.

Modes

• Crystals — transmissive, iridescent quartz clusters with colored absorption and dispersion, six palettes (Amethyst, Ice, Emerald, Citrine, Rose, Prism), a live clear-quartz mix, elastic growth animation.
• Molten fissures — strokes tear glowing cracks into the surface: a TSL-shaded blackbody core with traveling heat pulses and a white-hot propagation front, lightning-like side branches (live density/length controls), basalt rock lips, rising embers, and flickering orange light spill. Crossing fissures blend additively into hotter junctions.
• Aurora silk — strokes unfurl waving curtains of light: two silk layers displaced by layered sine waves in the vertex stage, fold-locked brightness (the cloth glows along its moving folds), drifting ray striations, a glowing hem, twinkling star motes, and four palettes including a cosine-cycling Spectrum.
• Bioluminescent reef — strokes seed living deep-sea colonies: recursively branched staghorn corals studded with glowing polyps, swaying anemones, gorgonian fan lattices, drifting plankton — all pulsing on one traveling light wave that ripples through the whole reef like a signal through a single organism.
• more coming…

The look

• WebGPU renderer (WebGL2 fallback), ACES filmic tone mapping, MSAA post pipeline.
• Custom studio environment: a black room with an HDR overhead softbox, cool/warm side strips and a violet back wash, prefiltered into the environment map — every highlight on the lacquered sphere and the crystals is one of these shapes.
• Soft-shadow key light, cool rim, violet underglow lifting the sphere off the floor.
• Bloom on the crystals' inner glow, drifting dust motes, slow floating bob.

Controls

Input	Action
Drag (paint mode)	Paint a crystal vein on the sphere
D / mode pill	Toggle paint ↔ orbit
Drag / scroll (orbit)	Rotate / zoom
GUI	Palette, density, size, lean, glow, lighting, bloom, seed, replay growth

Run

npm install
npm run dev

Requires a browser with WebGPU (recent Chrome/Edge) — falls back to WebGL2.