Casey Primozic / ameo
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Casey Primozic / ameo
@ameo.dev
180 followers 210 following 69 posts
Programmer, primarily. Music makes life worth living; the internet is the greatest wonder of our age.

https://cprimozic.net/

Previously found at: https://twitter.com/Ameobea10
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Casey Primozic / ameo @ameo.dev · Nov 12
Hi - I'm Casey / ameo, previously found on Twitter @ameobea10

I write code and build software for a living and as a passion. Some interests are 3D graphics, Rust, WebAssembly, and building high-performance apps in the browser

I post about my projects and write blog posts here: cprimozic.net/blog/
Blog
The personal technical blog of Casey Primozic
cprimozic.net
ameo.dev
An alternate style

This one took almost 8 minutes to generate though.

CGAL has some pretty severe performance issues when running in Wasm. It relies on having strict control over FPU rounding mode flags, but those aren't controllable in Wasm, so expensive emulation is needed
A screenshot of a 3D model created and rendered with Geotoy. It depicts a multi-layered folded shell enclosed in a spherical area, textured and shaded with shiny gold-colored streaks across its surface. The base surface appears rather matte and rocky while the golden streaks are shiny and metallic. It consists of many separate thin layers of material that warp and curl in roughly the same way as each other, yielding an organic look reminiscent of a smooth endoplasmic reticulum.
October 26, 2025 at 7:27 PM
ameo.dev
My latest creation with Geotoy, built using the alpha wrap function from the CGAL library

I've been getting a ton of value out of this; it's really useful for creating organic-looking structures

You can see it in 3D here: 3d.ameo.design/geotoy/edit/62
(takes ~30 seconds to run)
A screenshot of a 3D model created and rendered with Geotoy. It depicts a multi-layered folded shell enclosed in a spherical area, textured and shaded to look somewhat copper-colored. The surface appears rather shiny and metallic with colors ranging from orange/brown to pink, peach, and crimson. It consists of several separate thin layers of material that warp and curl in roughly the same way as each other, yielding an organic look reminiscent of a smooth endoplasmic reticulum.
October 25, 2025 at 11:13 PM
ameo.dev
I've not been writing enough blog posts in recent months, I need to get back on that.
October 24, 2025 at 3:50 PM
ameo.dev
A pedestrian bridge from the Ghost in the Shell live action movie I built in Geotoy

3d.ameo.design/geotoy/edit/54
A screenshot of a 3D model of a pedestrian bridge rendered with Geotoy. It shows a bridge with a green fence along either side and several large windows. There is a text editor with code at the bottom. A screenshot from the Ghost in the Shell live action movie showing a pedestrian bridge. The bridge is made of metal and painted white with large windows cut into its side and a green railing. There are large highrise apartment buildings in the background.
September 15, 2025 at 6:44 AM
ameo.dev
I recorded a little video giving a tour of my Geotoy project

www.youtube.com/watch?v=CtbX...
Geotoy Showcase + Demo
YouTube video by CaseyC104
www.youtube.com
September 2, 2025 at 6:21 PM
ameo.dev
Wrote a little post this weekend about all the tech/tools/techniques that went into my Geotoy project

cprimozic.net/blog/the-tec...
The Tech Behind Geotoy
cprimozic.net
August 18, 2025 at 11:29 PM
ameo.dev
I wrote up a post over the weekend about the whole process I used to get this working for anyone looking to do the same

cprimozic.net/notes/posts/...
August 4, 2025 at 3:22 PM
ameo.dev
After _much_ effort, I've gotten the boundary-first-flattening library compiling to WebAssembly (geometrycollective.github.io/boundary-fir...)

So now I can auto-unwrap UVs for meshes that triplanar mapping works badly for in Geotoy
A screenshot of a mesh rendered in Geotoy. It looks like a sphere with some holes drilled in it that has been split in half sideways. The sphere is textured with a debug texture showing UV coordinates across different parts of its surface
August 3, 2025 at 5:54 PM
ameo.dev
I'm putting real effort into making the docs for geoscript/geotoy as high-quality as possible

I created these little inline examples that show the code and its output directly on the docs page

3d.ameo.design/geoscript/do...
A screenshot of the docs page for geoscript showing details about the `stitch_contours` function. At the top of the docs for that function, there is an expanded example that shows some geoscript code on the left using the function and an image on the right representing the output of running that code. Below the example, there are docs for the function including the function signature, argument names+types+default values, return type, and a description of each argument.
July 25, 2025 at 8:19 PM
ameo.dev
Re-discovered this absolute banger of a song today

www.youtube.com/watch?v=ajD9...

It's just so incredibly satisfying to listen to for some reason
t+pazolite - Heartache Debug (feat. 赤川ねね)
YouTube video by t+pazolite
www.youtube.com
July 25, 2025 at 5:10 AM
ameo.dev
It's always so hard to call something "finished" but I'm making a lot of cool stuff with this already tbh

3d.ameo.design/geotoy
A screenshot of the geotoy web app showing a scene that looks like a roof composed of interlocking shingles. the shingles are a curved shape with a shiny gray stone-like texture. There is a code editor in the bottom left of the screen showing some syntax-highlighted code in a functional-looking programming language. It has variables like `shingle` and function calls like `fan_fill` and contains the code that defines the scene. In the bottom right of the screen, there is some output showing basic stats about the scene and program like runtime in milliseconds, total vertices, and total face count.
July 22, 2025 at 11:35 PM
ameo.dev
TIL my webserver's ipv6 configuration has been broken since it got rebooted several weeks ago

But things have still been working even for ipv6 users thanks to the "Happy Eyeballs" algorithm from RFC 8305: datatracker.ietf.org/doc/html/rfc...
RFC 8305: Happy Eyeballs Version 2: Better Connectivity Using Concurrency
Many communication protocols operating over the modern Internet use hostnames. These often resolve to multiple IP addresses, each of which may have different performance and connectivity characteristi...
datatracker.ietf.org
July 16, 2025 at 7:40 PM
ameo.dev
Sneak peak of a project I've been working on recently
Screenshot of a web app showing a 3D model of what looks something like a bird bath rendered along with a code editor with some code in a functional-looking programming language. There's a "run" button along with some stats about how long the code took to run, how many faces/vertices are in the mesh, etc.
June 28, 2025 at 11:14 PM
ameo.dev
I think it was around Covid era when I first started seeing Internet culture show up in graffiti

I love it
A photograph of some graffiti featuring text written in black on a white background. The text says "bro had the texture pack on". There's various other scribbles and illegible text surrounding that writing.
June 1, 2025 at 3:45 AM
ameo.dev
Finished up a blog post I've been meaning to write for a while:

cprimozic.net/blog/buildin...

#webaudio
Building Modular Audio Nodes in Web Audio
An overview of the patterns I've developed for building modules for my browser-based DAW and audio synthesis tool. It outlines solutions for keeping state synchronized between threads, handling async...
cprimozic.net
May 19, 2025 at 5:20 AM
ameo.dev
Really fascinating paper with techniques for dramatically speeding up raytracing of FBM-based procedural scenes

inria.hal.science/hal-05046040

Volumetric rendering is one of my favorite topics in computer graphics, and I'd love to try implementing this technique in my three.js work
Fast sphere tracing of procedural volumetric noise for very large and detailed scenes
Real‐time walk through very large and detailed scenes is a challenge for both content design, data management, and rendering, and requires LOD to handle the scale range. In the case of partly stochast...
inria.hal.science
May 7, 2025 at 8:43 PM
ameo.dev
Been getting around to some work on my browser-based DAW project again, finally getting a proper visual EQ built out

I'm finally accumulating a decent amount of building blocks for these modules in the codebase rather than having to build everything from scratch each time
April 28, 2025 at 5:28 AM
Reposted by Casey Primozic / ameo
fasterthanli.me
Help test rust-analyzer! Now with 100% more salsa: exciting stuff

www.reddit.com/r/rust/s/Lxp...
From the rust community on Reddit: call for testing: rust-analyzer!
Explore this post and more from the rust community
www.reddit.com
March 17, 2025 at 7:19 AM
ameo.dev
6:00 PM sunset providing incredible amounts of energy, motivation, and feelings of well-being

And daylight savings switch will make it 7PM very soon
March 6, 2025 at 2:18 AM
ameo.dev
Getting close the part of the year where days get longer the fastest!

This chart shows the daily percentage change in day length over the year for some different latitudes.

For me, having days get longer faster really helps get that "spring is coming!" energy going
A plot showing the daily percentage change in day length by latitude. The higher the latitude, the more dramatic the changes are, but they all peak around February. Image source: http://wordpress.mrreid.org/2014/10/19/rate-of-change-of-day-length-with-latitude/
February 10, 2025 at 10:06 AM
ameo.dev
I've finally finished my Advent of Code optimization blog post, just in time before the new year

cprimozic.net/blog/optimiz...
Optimizing Advent of Code D9P2 with High-Performance Rust
A detailed summary of the techniques I used to optimize my Advent of Code 2024 solution for Day 9 Part 2. Employs a variety of techniques including algorithmic shortcuts, bespoke data structures, and...
cprimozic.net
January 1, 2025 at 5:00 AM
ameo.dev
I'm finally working on a new blog post: a rundown of the very cool optimizations I used to compute Advent of Code 2024 day 9 part 2 as fast as possible

I'm using TikZ to create the visualizations, which creates SVGs that have a nice academic vibe to them
A diagram demonstrating how the algorithm for day 9 part 2 of advent of code operates. It shows rows of cells filled with numbers of blanks. Each row shows the state of the filesystem after one iteration of defragmenting. There are arrows drawn to indicate where files are removed from and written to.
December 27, 2024 at 1:57 AM
ameo.dev
A new one for me:

Someone has created a fake Twitter account for one of my side projects. It's filled with dozens of seemingly AI-generated posts trying to make it look like it's partnering with some crypto pump-and-dump website

Fascinating times we live in
December 26, 2024 at 7:02 PM
ameo.dev
I wrote up some notes about how I used constrained cubic bezier curves in the envelope generator for my browser-based synthesizer

cprimozic.net/notes/posts/...

They look and sound much better than the x^n function I had before, and I the math involved turned out to be very neat
December 26, 2024 at 4:08 AM
ameo.dev
I saw my excuse to pull in Z3 to solve today's advent of code (day 13) and I took it

It was a bit like using a hydraulic press to crush an empty soda can, but I never pass up an opportunity to use Z3

#AdventOfCode
December 13, 2024 at 7:18 AM