otaviogood

7 ms·

1.
by otaviogood 3mo ago
FWIW, I tried the prototype. It's very real. I scanned my hand and arm. It showed realtime images of slices of my hand as I dipped my hand in the water. Really amazing IMO. I think this will be a game changer when it comes out. It&#x27
2.
by otaviogood 5mo ago
for an introduction to the CAD software, Kicad, which this project uses, I really liked "Shine on you crazy Kicad": https://www.youtube.com/watch?v=eMW9ohCbcik&t=27s It takes you from basics to buying a PCB fr
3.
by otaviogood 7mo ago
Like many have said, start with Arduino-like boards + servos. You can get servo driver boards that let you plug in multiple servos to your Arduino without power problems. Get those from Adafruit. Then you can graduate to the "bus"
4.
by otaviogood 1y ago
You might be reading into it too much. I think the originals were just random pieces of different kinds of paper. Graph paper, yellow lined, paper, blank white paper... I don't remember exactly, but I think the copies could be special
5.
by otaviogood 1y ago
DARPA scanned the shreds. The funny thing is, they didn't want to shred the original paper, so first they photocopied the paper in a high quality color copier, shredded it, and scanned it. And that's where the little yellow dots c
6.
by otaviogood 1y ago
Me and my team used these yellow tracking dots to reconstruct shredded documents for a DARPA shredder challenge over a decade ago. You can see our program highlight the dots as we reconstruct the shredded docs. https://www.youtub
7.
by otaviogood 3y ago
This is much more interesting if you see the animations. https://x.com/jaschasd/status/1756930242965606582
8.
by otaviogood 3y ago
‘1984 is 1 token. 1884 is 2 tokens.’ I would be surprised if they use this tokenization still as it’s not math friendly.
9.
by otaviogood 4y ago
Where do you see the room for improvement that gets you to much faster speeds? Also I love the single file to do everything. :)
10.
by otaviogood 5y ago
The geometry in my raytracer can either be ray-traced primitives, like spheres or boxes, or it can be "signed distance functions" (SDFs), which let you define all kinda of crazy shapes. Inigo Quilez does a good job of explaining S
11.
by otaviogood 5y ago
This article talks about a pretty full-featured ray tracer. If you just want to play around with some ideas and have fun, you can make different tradeoffs and still get very nice and fast renderings. Here's a ray tracer that I made tha
12.
by otaviogood 5y ago
I thought it would be nice to listen to these with my podcast player on iphone. Here's my too-complicated process that worked: - in Chrome inspector, look at the network tab when you click play on a Feynman lecture. Right click the mp4
13.
by otaviogood 5y ago
Maybe we should have tried Daily. :) We tried Twilio video and unfortunately had a really hard time tracking down bugs. Wasted tons of time on that and then went back to doing our own stuff. :( I still don't know where the bug was. Cou
14.
Show HN: We made a proximity-based video chat for events(unnamed.chat)
11 points by otaviogood 5y ago|3 comments
15.
by otaviogood 5y ago
25 person Zoom calls aren't fun. So me and my friends made a virtual gathering space for people to host online events, meetups, social hours, etc. Tech: Frontend uses Svelte / Snowpack, which is great. The game view uses the DOM,
16.
by otaviogood 8y ago
I think this eventually turned into Andrej Karpathy's class at Stanford, CS231n. The class notes are here: http://cs231n.github.io/ The class is on youtube. If you like this hacker's guide, I think you'll def
17.
by otaviogood 8y ago
People say you have to "do" math to learn it. Usually they make it sound like you need to do the exercises in the books. I think that doing just that can be boring and demotivating. I would suggest finding projects that can motiva
18.
by otaviogood 9y ago
Books might not be the best resource for Shadertoy-type stuff. Almost all of Shadertoy 3d shaders use a technique called ray-marching with signed distance functions. If you Google it, you should find good resources. Also, someone on Shadert
19.
by otaviogood 9y ago
Shadertoy shaders _do_ include the render algorithm. That shader is completely ray-traced, so the only real input that is used for that shader is the x, y coordinates and time. It's not using any of the GPU's polygon rasterization
20.
by otaviogood 9y ago
It could be fun if you released your tagged data set of lego piece pictures so people in the ML community could try to write classifiers. Even untagged pics could be interesting.
21.
by otaviogood 10y ago
http://www.arxiv-sanity.com That helps sort through arxiv papers and get recommendations.
22.
by otaviogood 10y ago
The Skew language compiles to Javascript, C#, and C++ (which is still a work in progress). So if you don't like that it's in Skew, you might have the option to switch it to one of those languages. It probably won't work for t
23.
by otaviogood 12y ago
Yes, one of the keys to reconstructing the harder puzzles was that we found a yellow dot pattern on the paper. At the time, I was reading HN and I saw a headline that said something about the government tracking photocopies using little yel
24.
by otaviogood 12y ago
I was on the team that won the shredder challenge. I talked to one of the UCSD people afterwards and he practically convinced me that my team did it. After a while I realized that it was so damn easy to sabotage their effort that I didn&#x2
25.
by otaviogood 12y ago
Since you mentioned it, me and at least 2 other people have written Tetris in 256 bytes. I used 80286 assembly and you probably can't get away with that these days - even when I did, it was already old. 64 bit code will probably be muc
26.
by otaviogood 12y ago
Don't be afraid to drop a project. I tend to have a handful of projects going at any one time. A good project will stand out and it will pull you through to completion. Pretty much all of my significant jobs were spun out of my side pr
27.
Bio-Hackers Pore Through A Child’s DNA For The Source of A Mysterious Disease(techcrunch.com)
5 points by otaviogood 13y ago|0 comments
28.
by otaviogood 13y ago
Yeah, jf is friends with the dev team. When we first released Word Lens, he posted it and explained Hacker News us. HN made such a huge difference for getting the word out. Since then I've been reading HN many times daily. So thanks, H
29.
by otaviogood 13y ago
Yes, it works best with larger fonts. There's not a lot we can do about the focus on the software side unfortunately.
30.
by otaviogood 13y ago
Yes, this is the same app I was showing to people at Super Happy Dev House pretty much the whole way through the development process. I'm a big fan of SHDH. So many creative people.

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