A gather of molten glass turns on the end of a blowpipe in front of the furnace mouth: it glows white-orange as it is reheated, swells and is shaped into a new form, droops a little with the heat, then cools through red into clear glass before the next heat.
Run the real thing here, tune it, then copy the prompt that rebuilds it.
The preview is the real three.js scene in a sandboxed frame, not a recording. Everything responds to you.
Swatches recolour, sliders move the parameters that matter, Randomize finds what you would not have typed. Structural changes rebuild the geometry.
Single HTML by default, or a Next.js, React, Vue or Astro component that imports three from npm.
It carries geometry, motion, camera and material intent with your values, in build order.
Geometry, then motion, then camera, then material. Scroll and hover behaviour usually takes a second pass; that is normal.