Observed arrival · 2026-09-30
Indicatrix, a gemstone optics workbench
An MIT-licensed spectral path tracer and faceting-design CAD for cut gemstones, with a browser version and a desktop app.
○Open
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$Paid
†Ads
✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- Gemstone faceting designers and optical-rendering users
- Worth noticing
- The site describes 32 built-in materials with cited or derived dispersion fits, and a tiered CPU/GPU equivalence harness.
Field notes
The renderer uses eight wavelength channels per path and material-specific Sellmeier or Cauchy dispersion data; the site lists 32 built-in materials. Its optional WGSL GPU port is checked against the CPU reference through bit-exact state checks, per-function error budgets, and statistical image comparisons. The homepage labels faceting CAD and the rough planner beta and under active development.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use
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