@demofox@mastodon.gamedev.place
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demofox

@demofox@mastodon.gamedev.place

Graphics and game dev research. previously nvidia, blizzard, monolith, others. graphics, audio synth, exotic computation. No gods, no masters. http://blog.demofox.org.

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demofox, to random
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New Blog Post: A Low Discrepancy Shuffle Iterator (+Random Access & Inversion)

What if you had a shuffle iterator that could traverse a shuffle, without actually shuffling.

What if that shuffle was a low discrepancy sequence so neighboring values were very different and had nice numerical properties?

Another POV: selection without replacement. stateless, and low discrepancy.

https://blog.demofox.org/2024/05/19/a-low-discrepancy-shuffle-iterator-random-access-inversion/

demofox,
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C++ header only implementation available at https://github.com/Atrix256/GoldenRatioShuffle/blob/main/LDShuffle.h

BartWronski, to random
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Are there any shader toy experts here?

Two of my recent shader toys display just black on iOS Safari (no compilation errors), while a separate iOS app shows them "okay" (some bugs, but at least not a black screen).
https://www.shadertoy.com/view/clXXDs
https://www.shadertoy.com/view/MfyXzV
Nothing crazy, pretty simple, but using feedback for TAA accumulation.

demofox,
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@BartWronski you might try explicitly initializing the buffer values to make sure no NaNs are coming from uninitialized memory.

demofox,
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@BartWronski yeah it could be

demofox,
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@BartWronski it would be great to get a pix or renderdoc capture wouldn't it? It seems like they (browsers) sometimes have support for it, but then remove it, then re add it in a different way. It makes it real hard when it's so opaque, but it also forces us users to get real creative with debugging, which is a nice skill to have after acquiring it tbh 😂

stux, to random
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Gaming in your 30s

Makes me feel super super old Sketch from unknown (please comment if you know author)

demofox,
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@stux tfw my dad was talking about pong 25+ years ago

demofox, to random
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Anyone have any tips for repairing or desoldering corroded solder? I've tried applying fresh solder but not all points would take it.
Also, I'm thinking the brown line across the bottom is supposed to be a connection between all of them for ground. I think its corroded to not work as well anymore. Does that look/sound right to people? In the second image, it's the side with a single wire plugged in.

image/jpeg

demofox,
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@dotstdy thanks a lot. I have some solderwick, I forgot. And replacement buttons and LED. I shall give it a go

demofox,
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@TomF that makes a lot of sense.

demofox,
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Thanks @TomF and @dotstdy , I drilled out the corroded chunks of solder and cleaned it up some. Now to reassemble it with fresh components.

demofox, to random
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An ESPN article talks about a rendering algorithm a friend of mine made (gibs). LOL what an odd world we live in...
https://www.espn.com/college-football/story/_/id/40153072/inside-return-ea-sports-college-football-video-game

whitequark, to random
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being ready to die affords you the most complete freedom of action you can have. therefore you must be ready to die at any moment

demofox,
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@whitequark I honestly dig this pov.

Quinnypig, to random
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I'm sorry Slack, you're doing fucking WHAT with user DMs, messages, files, etc? I'm positive I'm not reading this correctly.

demofox,
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@Quinnypig yikes. All sorts of NDA'd info, trade secrets, unpublished research, secret game projects etc etc just right there sucked up into an LLM.

demofox, to random
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Hey @mbr , I remember you did that LDS thing with integers where you had an integer representation of Phi.
How did you calculate that integer version of Phi?
Did you just multiply phi by the the maximum value the int could represent and convert to int (floor / round)?

demofox,
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@mbr
Ah thanks.
I'm thinking about doing a "golden ratio shuffle" where you multiply phi by N (the number of items to shuffle), cast to integer, then search for the nearest coprime to do the repeated addition and modulus thing.
It makes it be less accurate phi, but always maximal length if my thinking is right :P

demofox,
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@mbr thanks Marc, I appreciate the assistance :)

demofox,
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@mbr I was just having that thought in the shower just now. Yeah. We were on the same page but didn't mention that 😂

demofox, to random
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I asked my son "if you flip a coin 3 times, is it more likely to get 3 heads in a row, or head, tails, tails?"
He thought for a second and thought "they are equally likely aren't they?"
Oh damn... he is so much smarter than I was.

demofox,
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I asked a follow up "lets say you flip two coins and add up how many heads you get. Is it more likely to get 0 or 1 as a result?"
He said "they are equally likely"
aha! I got him. Told him there are 2 ways to get 1 head, but only 1 way to get no heads and he said...
"oh that's like the galton board we made".
I thought i got him and then he started down the path of deriving the central limit theorem.
Geez kid, you are 10, chill out a bit! 😆

demofox,
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@MartianDays same same

demofox,
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@SonnyBonds oh man. That's mean!

BartWronski, to random
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I am excited to finally share our recent paper "Filtering After Shading With Stochastic Texture Filtering" (with Matt Pharr, @marcosalvi, and Marcos Fajardo), published at ACM I3D'24 / PACM CGIT, where we won the best paper award! 1/N

demofox,
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@BartWronski @aras artists are smarter than we give them credit for. I'm pretty sure incorrect lighting falloff was making up for the renders not being sRGB correct :P

demofox,
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@aras @BartWronski it sure is. I've tried to cite posts in both STBN and now FAST noise papers, and got a lot of push back on both papers. It's interesting cause the "real competitors" we ought to compare against live in blog posts IMO. (not as much push back at i3d btw Bart! that was nice.)

demofox,
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@aras @BartWronski like i have it on my personal blog todo list that i need to compare FAST vs these 2 types of noise.
https://tellusim.com/improved-blue-noise/
https://acko.net/blog/stable-fiddusion/

demofox,
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@aras @BartWronski Yeah, Bart is a mensch haha. & I love that the best research comes from people that are well versed in both worlds.

demofox,
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@mtothevizzah @BartWronski @aras @neil those trips sound so great

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