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mratsim
trace-of-radiance
C2020–2021
mratsim / trace-of-radiance

trace-of-radiance

An educational raytracer

Creative & MediaLearning & Reference
Explore on GitHubRead Hacker News discussions
5Distinct people
7Mentions
0Explicit recommenders
105GitHub stars
REPOSITORY AT A GLANCE

What to know before exploring

What it is

An educational raytracer

GitHub

Where it is used

No documented product use has been verified yet.

What people are saying

No recommendation phrase was found in the indexed comments.

No classified warning is attached to this page. Read the discussions before treating silence as approval.

Also in these discussions

Mentioned in the same Hacker News threads. That is not proof they are substitutes.

This week on Hacker News

Nov 7–Nov 14 UTC · Direct repository links and separately labeled related project stories. Indexed through 11/14/2026, 5:04:57 PM UTC.

No direct repository links were found in the indexed HN discussions over the past seven days. Older discussions are available below.

Mentions over time

HN mentions by month7 dated mentions

Observed mentions: 2020-05-31 18:58:14 UTC to 2021-02-01 03:49:11 UTC.

0122020-05-01 00:00:00 UTC to 2020-06-01 00:00:00 UTC (exclusive): 1 mentions; 1 submissions, 0 commentsMay 20202020-06-01 00:00:00 UTC to 2020-07-01 00:00:00 UTC (exclusive): 2 mentions; 1 submissions, 1 comments2020-07-01 00:00:00 UTC to 2020-08-01 00:00:00 UTC (exclusive): 2 mentions; 1 submissions, 1 comments2020-08-01 00:00:00 UTC to 2020-09-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 comments2020-09-01 00:00:00 UTC to 2020-10-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 commentsSep 20202020-10-01 00:00:00 UTC to 2020-11-01 00:00:00 UTC (exclusive): 1 mentions; 0 submissions, 1 comments2020-11-01 00:00:00 UTC to 2020-12-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 comments2020-12-01 00:00:00 UTC to 2021-01-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 comments2021-01-01 00:00:00 UTC to 2021-02-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 comments2021-02-01 00:00:00 UTC to 2021-03-01 00:00:00 UTC (exclusive): 1 mentions; 1 submissions, 0 commentsFeb 2021

Counts come from the repository’s dated source evidence. Index cutoff: 2026-11-02 08:16:59 UTC.

View mention counts and date ranges
UTC ranges include their start and exclude their end. Select a period to filter the source evidence.
PeriodStart (UTC)End (exclusive, UTC)MentionsSubmissionsComments
May 20202020-05-01 00:00:00 UTC2020-06-01 00:00:00 UTC110
Jun 20202020-06-01 00:00:00 UTC2020-07-01 00:00:00 UTC211
Jul 20202020-07-01 00:00:00 UTC2020-08-01 00:00:00 UTC211
Aug 20202020-08-01 00:00:00 UTC2020-09-01 00:00:00 UTC000
Sep 20202020-09-01 00:00:00 UTC2020-10-01 00:00:00 UTC000
Oct 20202020-10-01 00:00:00 UTC2020-11-01 00:00:00 UTC101
Nov 20202020-11-01 00:00:00 UTC2020-12-01 00:00:00 UTC000
Dec 20202020-12-01 00:00:00 UTC2021-01-01 00:00:00 UTC000
Jan 20212021-01-01 00:00:00 UTC2021-02-01 00:00:00 UTC000
Feb 20212021-02-01 00:00:00 UTC2021-03-01 00:00:00 UTC110

What Hacker News says

7 sources
mratsim·Oct 15, 2020
I've been diving into parallel reproducible PRNG [1] in the end I choose to have a PRNG based on xoshiro and seeding process that could take loop iteration variables [2] for reproducibility: - [1] https://github.com/mratsim/weave/issues/147 - [2] https://github.com/mratsim/trace-of-radiance/blob/99f7d85/tr... - Usage for parallel raytracing: https://github.com/mratsim/trace-of-radiance/blob/99f7d85/tr... Beyond the JAX paper, the Pedigree-based RNG from Leiserson was interesting as well: - http://supertech.csail.mit.edu/papers/dprng.pdf - https://pdfs.semanticscholar.org/a32c/3b7b8d5d3ebd594bea2d9c... And Haskell's splittable RNG: - http://www.hg.schaathun.net/research/Papers/hgs2015jfp.pdf - http://publications.lib.chalmers.se/records/fulltext/183348/... - http://gee.cs.oswego.edu/dl/papers/oopsla14.pdf
In A Family of Better Random Number Generators
mratsim·Jul 2, 2020
> Syntax wise Nim it is a step back. It's hard to read and understand while any C/C++ dev will have next to no effort reading through D code. And of course while D is C ABI compliant it interoperates with C++ well too. On the other hand, people coming from Python, Ruby, Pascal, Ada will appreciate the minimal amount of sigils. > I seriously doubt that Nim or any other language in this regard has better metaprogramming than D. Can you write an Embedded DSL + compiler running at compile-time in D - https://github.com/numforge/laser/tree/master/laser/lux_comp... Can you write a cryptographic library with hex conversion to big integer and modular arithmetic running at compile-time in D? - https://github.com/mratsim/constantine/blob/master/constanti... Can you generate a state machine that lowers down to optimized computed gotos with no dynami
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c allocation suitable for multithreading runtimes and embedded devices and able to display the actual graph at compiletime? - https://github.com/mratsim/Synthesis Can you describe x86 opcodes in a declarative way for a JIT assembler and do all the rex/modrm/sib computation at compile-time? - https://github.com/mratsim/photon-jit/blob/master/photon_jit... And the same thing for an emulator? - https://github.com/mratsim/glyph/blob/master/glyph/snes/opco... Can you implement async as a library? Can you emulate classes with ADTs to solve the expression problem, avoid cache misses and multithreading problem due to OOP and the double indirection due to the visitor pattern? - https://github.com/mratsim/trace-of-radiance/blob/master/tra... > Nim might have a speed overhead in certain tasks but that depends on a benchmark. Besides, does Nim have anything similar to NumPy which is actually faster? D does. It does: - https://github.com/mratsim/Arraymancer With CPU, OpenCL and Cuda backends (in differing state of maturity) and it's being used for data analysis for example ancestry prediction: - http://home.chpc.utah.edu/~u6000771/somalier-ancestry.html You can even run a neural network and see its training live: - https://github.com/Vindaar/NeuralNetworkLiveDemo AFAIK D doesn't have any plotting library while Nim has plot.ly integration and a ggplot2 port in pure Nim: - https://github.com/brentp/nim-plotly - https://github.com/Vindaar/ggplotnim And lastly nim can easily call Python: - https://github.com/yglukhov/nimpy or be called from Python: - https://github.com/Pebaz/nimporter
In Ray Tracing in Nim
mratsim·Jun 20, 2020
As the resident Nim optimizer, if you can reach some performance in C, you can reach it in Nim. With some work you can even reach the performance of code which is 95% assembly and has been tuned for years (i.e. matrix multiplication): - Reaching C Quake code speed in Nim: https://forum.nim-lang.org/t/5124#32241 - Reaching and going beyond OpenBLAS + OpenMP performance (almost pure Assembly): https://github.com/mratsim/weave/issues/68#issuecomment-5717... - Faster than C++ on Raytracing bench: https://github.com/mratsim/weave/tree/9f0c384f/demos/raytrac... - Faster than C++ on another Raytracing implementation: https://github.com/mratsim/trace-of-radiance/tree/v0.2.0 Also Nim is easy to integrate with Intel VTune, Apple Instruments and perf. You have full control on the data layout, prefetching and the same control as C over cache and memo
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ry usage if you so wish it (i.e. the GC is not a hindrance, you have easy escape hatches).
In NimConf 2020 Videos

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