Caustic

A steerable light-bench. Drag elements to place them, grab the ring handle to rotate, and click to select. Rays re-trace live by real geometric optics — reflection, Snell refraction, total internal reflection, thin-lens focusing, and Cauchy dispersion that fans white light into a rainbow.

Add element

Presets

Selected

Nothing selected. Click an element on the bench, or add one above.

Look

Glow 1.0

Bench

Seed

Drag body to move · ring to rotate · click to select · ⌫ / Del to remove.
Try the Prism or Spectrum preset and watch white light fan into a rainbow; Focus converges a fan to a point.