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demofox

@[email protected]

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

demofox OP ,
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@lritter I can always count on you to understand and appreciate these things, and have done similar work. It's nice not to just be a crackpot in the corner 😀

demofox OP ,
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@toerror that is so cool. If you haven't seen the term "format preserving encryption" is the formal term for it. It's a weird name, but it's used a lot. Credit card companies use it to generate the next credit card number, I've heard :)

demofox OP ,
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@j2kun yeah for sure! And I need to update the code to cache that off 😂

demofox OP ,
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@j2kun and thanks Jeremy. This is so niche, it seems very few people will understand the value, but you are definitely one of them :)

demofox OP ,
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@BartWronski that's a neat idea!
I've also tried a bit to get this working in 2d. I thought I had a nice solution but then I tried at different resolutions, and it fell apart.

demofox OP ,
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@BartWronski good idea, it might! I'll give it a go

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 OP ,
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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 OP ,
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@TomF that makes a lot of sense.

demofox OP ,
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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

demofox OP ,
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@steadmanticore phenomenal? 😀

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

demofox OP ,
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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 OP ,
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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 OP ,
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@MartianDays same same

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

seanmiddleditch , to random
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My wife is upset that they're called "toots" on Mastodon because, and I quote, "you're all just farting at each other!"

demofox ,
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@seanmiddleditch do you know the story? It's actually true

demofox , (edited )
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@seanmiddleditch this is the best resource I can find but afaik the person who suggested toot knew it was a fart thing but Eugen did not realize :P
https://mastodon.social/@Gargron/100419966679180204

BartWronski , (edited ) to random
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I am excited to finally share our recent paper "Filtering After Shading With Stochastic Texture Filtering" (with @mattpharr @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 great job on the come back story!

demofox ,
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@BartWronski haha - that feeling when you have two reviewer .

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

demofox ,
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@BartWronski @wadeb @mtothevizzah @iralmeida @aras I've been pushing for more use of differentiable slang at seed and ea. It's really nice if you want to do any learning/optimization at runtime. You can have the slang compiler turn it into raw hlsl too which makes it nice and portable.

lritter , to random
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after AI, what will be the next tech hype to get mad about? submissions are open

demofox ,
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@dysfun @lritter agreed about quantum if it gets here fast enough!

demofox ,
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@JamesWidman @dysfun @lritter not sure yet 😂

demofox ,
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@JamesWidman @dysfun @lritter how dare it search an unsorted list in O(sqrt(N)).
(Grover's algorithm)

demofox , to random
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Repairing a 3d print. Totally feels like a combination of welding and surface mount soldering 😂

demofox OP ,
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@luis yeah, it works amazingly well, except the knees

demofox OP ,
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@luis no, but that's not a bad idea

demofox , to random
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For folks that know me as "the blue noise guy", I've put together a 50 minute video that talks about many of the things I've learned in my ~decade long dive into noise and related topics - up to and including our latest paper published days ago at I3D.
I hope you enjoy it!
https://www.youtube.com/watch?v=tethAU66xaA

A slide showing how random numbers which are positively correlated on the screen give correlated resulting renders, uncorrelated random numbers give uncorrelated renders, and negative correlation random numbers give negatively correlated renders. Negatively correlated renders have the best perceptual quality, despite all three having the same actual error.

demofox OP ,
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@Az it's unfortunate that dithering helps reduce how many colors & bits you use, but makes it a lot harder to compress 😂

demofox OP ,
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@mamoniem not enough people know about 1d blue noise textures, let alone spatiotemporal, and now the generalization to arbitrary spatial and temporal filters.
More people need to hop on the train :)
I think there is still a lot of work to do in the area too. Lots of useful discoveries left to be made.

demofox OP ,
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@apoorvaj Thanks a lot, i really appreciate you saying that :)

demofox OP ,
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@longbool thanks a lot :)

Edmonds_Scanner , to random
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Turn that frown upside down.
Ok, now keep turning it all the way around and back down again, creating a powerful super-frown.
One so deep that not even angry magic bears would dare cross your path.

demofox ,
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@Edmonds_Scanner half spin frown takes 2 full rotations 🙃

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