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Willem Janssen

@Wlm@mastodon.gamedev.place

mastodon 4.6.6

Game programmer at Guerrilla
(Killzone 2, 3 & SF, Horizon Zero Dawn, Forbidden West & Hunters Gathering).

  Likes:
 • Astronomy, physics, science & tech 
• Metal
 • Playing VR racing and flying games (poorly)
 • Karate
• Mucking around with Godot in my spare time

 Living in Leiden (NL).
 Opinions are my own.
  (He/him)

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26 Posts

Joined October 31, 2022

Posts

Willem Janssen @Wlm@mastodon.gamedev.place · Jul 02, 2026

Boosted by

Furbland's Very Value = 71 Account™ @GroupNebula563@mastodon.social

Replying to @ErinRose@chaos.social

@ErinRose@chaos.social And a great hit song by Dolly Parton in 7/4 time

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Willem Janssen @Wlm@mastodon.gamedev.place · Jul 01, 2026

Replying to @VANTABlack2000@mastodon.gamedev.place

@VANTABlack2000@mastodon.gamedev.place @NullTheFool@mastodon.gamedev.place Oh right thanks for reminding me. I was considering @eniko@mastodon.gamedev.place’s Kitsune Tails bundle thing and you pushed me over the edge. https://mastodon.gamedev.place/@eniko/116818093928212931 (One day late for Pride Month but I hope they’ll forgive me.)

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Willem Janssen @Wlm@mastodon.gamedev.place · May 14, 2026

Replying to @j_bertolotti@mathstodon.xyz

@j_bertolotti@mathstodon.xyz LOL, I had no idea that was a common pattern in chaotic systems. Reminds me of the baker’s map, where you don’t even have to go to phase space to see the stretch and fold (or stack).

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Willem Janssen @Wlm@mastodon.gamedev.place · May 12, 2026

Replying to @stilgherrian@eigenmagic.net

@stilgherrian@eigenmagic.net Sure! First I need to write a better editor. Ooh, and a better language. Oh, and a universe with math that doesn’t have the halting problem… I’m pondering step 2 and 3 atm.

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Willem Janssen @Wlm@mastodon.gamedev.place · May 06, 2026

Replying to @lisyarus@mastodon.gamedev.place

@lisyarus@mastodon.gamedev.place Cool stuff! I’d go with “and”, “or” and “not” instead of &&, || and ! for my language (“c++ but better”). Particularly ! is too sneaky. I was so happy when I found those actually worked in c++! And sad when work disallowed them one month later. I dig how you fixed all the obvious things 😎(const by default, no uninitialized members, no implicit bool(!) (and other implicit casts for that matter)). Good luck!

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Willem Janssen @Wlm@mastodon.gamedev.place · May 05, 2026

Replying to @adhdeanasl@beige.party

@adhdeanasl@beige.party And here he is performing YYZ with Rush 😃 (at the Taylor Hawkins Tribute concert): https://youtu.be/C4mPNuAaB34

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Willem Janssen @Wlm@mastodon.gamedev.place · Apr 19, 2026

Replying to @victorgijsbers@mastodon.gamedev.place

@victorgijsbers@mastodon.gamedev.place True. It’s also a bit better at regular bike route planning in my experience (in NL).

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Willem Janssen @Wlm@mastodon.gamedev.place · Apr 18, 2026

Replying to @mgorny@social.treehouse.systems

@mgorny Heisenpun?

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Willem Janssen @Wlm@mastodon.gamedev.place · Apr 18, 2026

Replying to @redsad@ohai.social

@redsad Boosted specifically for the glasses

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Willem Janssen @Wlm@mastodon.gamedev.place · Apr 11, 2026

Replying to @kluthulhu@infosec.exchange

@kluthulhu @0xabad1dea Yeah, but Leiden and Haarlem are good Pocket-Amsterdams, with the canals and the old houses.

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Willem Janssen @Wlm@mastodon.gamedev.place · Apr 11, 2026

Replying to @oblomov@sociale.network

@oblomov @ZachWeinersmith Yeah it’s important to realize that they aren’t matrices per se, but matrices are one way to represent them (same with tensors). But maybe not yet in high school. (NB not a mathematician, so apologies for any sloppy terminology.)

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Willem Janssen @Wlm@mastodon.gamedev.place · Apr 11, 2026

Replying to @Wlm@mastodon.gamedev.place

@ZachWeinersmith I always liked the escalating order of discovery*: 1 + x = 1? Zero 1 + x = 0? Negative numbers 3 * x = 1? Rational numbers x * x = 2? Irrational numbers x * x = -1? Imaginary numbers x * y - y * x = 1? Quaternions (xy)z - x(yz) = 1? Octonions where every step is a 🤯. (*or invention if you will)

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Willem Janssen @Wlm@mastodon.gamedev.place · Apr 11, 2026

Replying to @ZachWeinersmith@mastodon.social

@ZachWeinersmith I’d say matrices are more confusing, and you’re gonna need the i notation later anyway. You can’t write reals either in a conventional way, so technically they’re weird too! (I realized later.) The whole “real” and “imaginary” names are a little misleading, but that’s a discussion that’ll quickly derail into philosophy. [edit: it helps to realize that a significant part of the reals are literally called “irrational” 😊]

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Willem Janssen @Wlm@mastodon.gamedev.place · Apr 11, 2026

Replying to @RinostarGames@mastodon.gamedev.place

@RinostarGames Disclaimer: I just searched a bit and have never compiled UE or plugins. I have a little Linux experience.

This link suggests compiling from command line, perhaps that works:

https://github.com/mayur-454/Compiling-Unreal-Engine-Plugin?tab=readme-ov-file#method-2-command-line-build

Tl;dr:

Make sure you have cmake installed, and clang, and some other things
Download plugin source
Try from UE (I think you already tried this)
Try from command line with shell script and cmake or make

Good luck, hope this helped

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Willem Janssen @Wlm@mastodon.gamedev.place · Mar 29, 2026

Replying to @chrisamaphone@hci.social

@chrisamaphone You are not the only one. I had a vague sense that it wasn’t right and was doubting J. Verne’s sense of scale. I finally figured it out while actually reading the thing a few years ago. So that’s “full adulthood, and make it a double”.

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Willem Janssen @Wlm@mastodon.gamedev.place · Mar 18, 2026

Replying to @pascaline@mastodon.nl

@pascaline @lalage Volgens mij is het ook om artsen in opleiding te laten oefenen met communiceren met kinderen. Wij zijn een paar jaar geleden ook met onze kinderen en knuffels geweest, in de veel te grote witte jassen 😍. En een ambulance-opbouw voor op een ziekenhuisbed om rond te scheuren en “Wieoew wieoew!” te roepen voor de spoedgevallen.

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Willem Janssen @Wlm@mastodon.gamedev.place · Mar 10, 2026

Replying to @NanoRaptor__dup_1737@bitbang.social

@NanoRaptor@bitbang.social I’m still disappointed that an otherwise details-and-standards-obsessed group of people did this, to the most establishedest of standards. Then again, they (and me?) also like getting too clever about names and acronyms.

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Willem Janssen @Wlm@mastodon.gamedev.place · Mar 10, 2026

Replying to @NanoRaptor__dup_1737@bitbang.social

@NanoRaptor@bitbang.social It’s kibi and Mebi now! And I am making sure everybody at work knows! And on the internet! And on the subway! And at increasingly awkward family dinners!

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Willem Janssen @Wlm@mastodon.gamedev.place · Mar 10, 2026

Replying to @webbop@tech.lgbt

@webbop@tech.lgbt @Jenetrix@tech.lgbt @NanoRaptor@bitbang.social No, the 1024 thing predates Microsoft afaik. Microsoft’s claim to fame is the “diskette is 1.44 MB”, where their Mega was 1000x1024 🤯.

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Willem Janssen @Wlm@mastodon.gamedev.place · Feb 16, 2026

Replying to @jwz@mastodon.social

@jwz@mastodon.social Aww, two days late for Roses are red Violets are blue All my base Are belong to you (source: the internet one or two decades ago)

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Willem Janssen @Wlm@mastodon.gamedev.place · Jan 11, 2026

Replying to @ids1024@mathstodon.xyz

@ids1024@mathstodon.xyz @solonovamax@tech.lgbt TIL; I thought Dune’s Butlerian Jihad was named after Rosie from the Jetsons and other robo-butlers 😁.

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Willem Janssen @Wlm@mastodon.gamedev.place · Dec 17, 2025

Replying to @MostlyHarmless__dup_1995@thecanadian.social

@MostlyHarmless@thecanadian.social That’s an … interesting juxtaposition between message and profile pic you got going there.

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Willem Janssen @Wlm@mastodon.gamedev.place · Nov 06, 2024

Replying to @caal@mastodon.social

@caal Eén Dirkjan? Nu is een goed moment om er 365 op je verlanglijstje te zetten. https://www.bol.com/nl/nl/p/dirkjan-scheurkalender-2025/9300000177488978/

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Willem Janssen @Wlm@mastodon.gamedev.place · Nov 04, 2023

Replying to @nixCraft@mastodon.social

@nixCraft This is eerily close to the actual math proof that 0.99999… (that’s infinite nines, not a thousand or so, subtle difference) is actually equal to 1. Don’t lick the knife! (E.g. https://en.wikipedia.org/wiki/0.999...)

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Willem Janssen @Wlm@mastodon.gamedev.place · Mar 18, 2023

Replying to @slomo@toot.cat

@slomo@toot.cat Operators are just syntactic sugar for functions anyway, so same thing really ;).

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Willem Janssen @Wlm@mastodon.gamedev.place · Mar 18, 2023

Replying to @slomo@toot.cat

@slomo@toot.cat Unsurprisingly (well, I had no idea really and had to check) this goes for C++ too. Which interests/worries me professionally. Source: https://en.cppreference.com/w/cpp/language/eval_order

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