model-synthesis
op25
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3.1 | 9.5 | |
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GNU General Public License v3.0 or later | - |
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model-synthesis
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City Generation with WFC
WFC is based on my work on Model Synthesis. I consider how to create fully connected (navigable) road networks in my 2011 TVCG paper. Here is an example of a generated road network from that paper.
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Ask HN: What weird technical scene are you fond/part of?
https://www.youtube.com/watch?v=Dfc-DQorohc
Craig Reynolds said the name "Boids" was inspired by The Producers Concierge scene, so that's how you should pronounce it:
Boids. Dirty, disgusting, filthy, lice ridden Boids. Boids. You get my drift?
https://www.youtube.com/watch?v=aL6mTMShVyk
The other really cool rabbit hole to explore for generating tiles and even arbitrary graph based content (I'm sold: hexagons are the bestagons!) is "Wave Function Collapse", which doesn't actually have anything to do with quantum mechanics (it just sounds cool), but is actually a kind of constraint solver related to sudoku solvers.
https://escholarship.org/content/qt3rm1w0mn/qt3rm1w0mn_noSpl...
Maxim Gumin's work: https://github.com/mxgmn/WaveFunctionCollapse
Paul Merrell's work:
https://paulmerrell.org/model-synthesis/
https://paulmerrell.org/research/
Oskar Stålberg's work:
https://twitter.com/OskSta/status/784847588893814785
https://oskarstalberg.com/game/wave/wave.html
There's a way to define cellular automata rules by giving examples of the before and after patterns, and WFC is kind of like a statistical constraint solving version of that.
So it's really easy for artists to define rules just by drawing! Not even requiring any visual programming, but you can layer visual programming on top of it.
That's something that Alexander Repenning's "AgentSheets" supported (among other stuff): you could define cellular automata rules by before-and-after examples, wildcards and variables, and attach additional conditions and actions with a visual programming language.
AgentSheets and other cool systems are described in this classic paper: “A Taxonomy of Simulation Software: A work in progress” from Learning Technology Review by Kurt Schmucker at Apple. It covered many of my favorite systems.
http://donhopkins.com/home/documents/taxonomy.pdf
Chaim Gingold wrote a comprehensive "Gadget Background Survey" at HARC, which includes AgentSheets, Alan Kay's favorites: Rockey’s Boots and Robot Odyssey, and Chaim's amazing SimCity Reverse Diagrams and lots of great stuff I’d never seen before:
http://chaim.io/download/Gingold%20(2017)%20Gadget%20(1)%20S...
Chaim Gingold has analyzed the SimCity (classic) code and visually documented how it works, in his beautiful "SimCity Reverse Diagrams":
>SimCity reverse diagrams: Chaim Gingold (2016).
>These reverse diagrams map and translate the rules of a complex simulation program into a form that is more easily digested, embedded, disseminated, and and discussed (Latour 1986).
>The technique is inspired by the game designer Stone Librande’s one page game design documents (Librande 2010). If we merge the reverse diagram with an interactive approach—e.g. Bret Victor’s Nile Visualization (Victor 2013), such diagrams could be used generatively, to describe programs, and interactively, to allow rich introspection and manipulation of software.
>Latour, Bruno (1986). “Visualization and cognition”. In: Knowledge and Society 6 (1986), pp. 1– 40. Librande, Stone (2010). “One-Page Designs”. Game Developers Conference. 2010. Victor, Bret (2013). “Media for Thinking the Unthinkable”. MIT Media Lab, Apr. 4, 2013.
https://lively-web.org/users/Dan/uploads/SimCityReverseDiagr...
Agentsheets: Alexander Repenning (1993–)
Interacting agents are embedded and interact within
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Wave Function Collapse
If we called it Model Synthesis it'd get fewer clicks…
- Wave Function Collapse library in pure C
op25
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multi_rx,py example for decoding multiple voice channels on single rtlsdr
looks like it may not be able to do what I want it to do according to this. https://github.com/boatbod/op25/issues/184
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How can we convert a DMR signal into clear voice by RTL_SDR?
I have no experience with DMR myself, but my understanding is that the Boatbod fork of OP25 has experimental DMR support, and I believe SDRTrunk software does, too.
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Ask HN: What weird technical scene are you fond/part of?
Using OP25[1] with RTL-SDR dongles to implement scanners for trunking P25 radio systems on a computer. And as a sidebar to that, listening in on geographically remote public safety radio systems using Broadcastify[2]. It's basically the old "radio scanner" culture, but taken online and distributed worldwide. People listen to all sorts of stuff, but given my background as a former firefighter and former 911 dispatcher, my main interest is listening to public safety dispatch stuff.
That said, another commenter below mentioned modern "phreaking" and how it's become more radio centric... and while I won't admit to doing anything illegal, let's just say that there's some interesting stuff you can do / look at / listen to these days, especially with ubiquitous and inexpensive SDR hardware and related resources. See the recent story about the KrakenSDR passive radar stuff, and some of the papers that are out there about P25 security flaws, some of the automobile hacking stuff that's RF based, etc., etc. There's a fascinating world out there buzzing around on invisible electromagnetic fields... and you can tap into it with a $30 dongle and a Raspberry Pi (or your PC).
[1]: https://github.com/boatbod/op25
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Is this encryption or frequency hopping or just not FM modulation? Not law enforcement, just a school they use Motorola handhelds.
If it's P25 Phase I or Phase II then SDRTrunk might work. boatbod's op25 might be another option, but more complicated to set up.
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Using a Raspberry Pi without a GUI to stream scanner audio to a phone
I don't have a full guide for you, but I use https://github.com/boatbod/op25 for receiving and decoding P25 Phase 1 digital signals on the command line.
- Would a SDR be able to listen to walkie talkies at my school?
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What do you use your homelab for?
op25
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How can I hear the Franconia, VA (Fairfax Co) Police, Fire, EMS scans? Unsure if there is a specific open mhz link for them. Thanks!
If you are handy with Linux you can use an RTL-SDR and OP25 on a Raspberry Pi or really any PC. This is the page for the Fairfax trunked system https://www.radioreference.com/apps/db/?sid=6957. Any talkgroup with mode D can be listened to, mode DE is encrypted. If you want I already have config files made up for the police dispatch and fire/ems dispatch channels.