MAmagicalist·Aug 22, 2014
It's also on github: https://github.com/evanw/webgl-path-tracing
In Brigade 3: Real-time Path Tracingevanw
webgl-path-tracing
JavaScript2014–2014
evanw / webgl-path-tracing
webgl-path-tracing
Path tracing in GLSL using WebGL
2Distinct people
2Mentions
0Explicit recommenders
372GitHub stars
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What it is
Path tracing in GLSL using WebGL
GitHub
Where it is used
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What people are saying
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This week on Hacker News
Nov 7–Nov 14 UTC · Direct repository links and separately labeled related project stories. Indexed through 11/14/2026, 3:03:16 PM UTC.
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HN mentions by week2 dated mentions
Observed mentions: 2014-07-20 09:07:40 UTC to 2014-08-22 20:09:03 UTC. Weeks start Monday, UTC.
Counts come from the repository’s dated source evidence. Index cutoff: 2026-11-02 08:16:59 UTC.
View mention counts and date ranges
| Period | Start (UTC) | End (exclusive, UTC) | Mentions | Submissions | Comments |
|---|---|---|---|---|---|
| Jul 14 | 2014-07-14 00:00:00 UTC | 2014-07-21 00:00:00 UTC | 1 | 0 | 1 |
| Jul 21 | 2014-07-21 00:00:00 UTC | 2014-07-28 00:00:00 UTC | 0 | 0 | 0 |
| Jul 28 | 2014-07-28 00:00:00 UTC | 2014-08-04 00:00:00 UTC | 0 | 0 | 0 |
| Aug 4 | 2014-08-04 00:00:00 UTC | 2014-08-11 00:00:00 UTC | 0 | 0 | 0 |
| Aug 11 | 2014-08-11 00:00:00 UTC | 2014-08-18 00:00:00 UTC | 0 | 0 | 0 |
| Aug 18 | 2014-08-18 00:00:00 UTC | 2014-08-25 00:00:00 UTC | 1 | 0 | 1 |
What Hacker News says
2 sourcesI've done some similar implementations years ago (but with C/OCaml, nothing on the GPU), so I didn't refer to many things for this.
Fresnel reflectance is based off of http://mathinfo.univ-reims.fr/IMG/pdf/Combined_rendering_of_..., although I'm not doing any spectral or polarization-dependent code right now (I wanted to leave that open, and it allows accurate metal simulation).
I tinkered with a blend of some pseudorandomness functions until getting something that worked.
https://www.siggraph.org/education/materials/HyperGraph/rayt... was used for ray-box intersection.
The distance function experiment for the drinking glass is based off of the concept of http://www.iquilezles.org/www/articles/distfunctions/distfun... (like raymarching, includes normal computation).
I consulted http://madebyevan.com/webgl-path-tracing/ to see the best way
Read the rest
to do accumulation (and made some realism fixes in https://github.com/jonathanolson/webgl-path-tracing, see https://github.com/evanw/webgl-path-tracing/pull/1 for details).
Many other things can be pulled from online or from books like http://www.amazon.com/Game-Engine-Design-Interactive-Technol....
Please let me know if you have any questions, (see my email at http://jonathan-olson.com/about), and please feel free to use my code however you like (things I wrote are MIT, but I use CC-by and CC-by-non-commercial HDR images).