New blog post! (yep, at New Year's Eve.) A short detour into a fun one-liner shading model I use for clouds in my game 🥰 lisyarus.github.io/blog/posts/a...

New post! "Realtime Raytracing in Bevy 0.18 (Solari)" jms55.github.io/posts/2025-1...

My "No Graphics API" blog post is live! Please repost :) www.sebastianaaltonen.com/blog/no-grap... I spend 1.5 years doing this. Full rewrite last summer and another partial rewrite last month. As Hemingway said: "First draft of everything is always shit".

Cem Yuksel's update to the teapot model looks great with a glass material! #metalrt #rendering

A modernized Utah Teapot model with interior! You can see/customize/download it, along with historical versions on the official teapot page: graphics.cs.utah.edu/teapot/

After nine years of development, meshoptimizer has reached its first major version, 1.0! This release focuses on improvements in clusterization and simplification as well as stabilization. Here's a release announcement with more details on past, present and future; please RT! meshoptimizer.org/v1

Naive attempt at loading the Zorah scene. Uses 200GB of RAM. With enough swap and patience, who needs optimization?.. #metalrt #rendering

Zorah looks like a nice level-up if you've conquered the classic Swallowing the Elephant challenge! (pharr.org/matt/blog/20...)

Some images showing off my improvements to my photon mapper I have integrated into truetrace The photon mapper is up on the Dev branch on the github

My latest coding adventure is now up on YT -- some experiments with ray-tracing glass and water, and the cool caustics they can cause youtu.be/wA1KVZ1eOuA?...

Experimenting with a face extrusion and retraction brush in my toy #voxel editor. Threw a bit of #raytracing in there while I was at it ✨

Got an MRI so I played with some renders of the inside of my melon. #metalrt #rendering

Morphing fractal shapes. This is a Julia fractal with a linear interpolation of the distance function between iteration counts. Starts by interpolating between 1 and 3 iterations, then 3 and 5, etc... The material also changes for no particular reason... #metalrt #rendering #fractal

New on Metal by Example: Getting Started with Metal 4, a breezy introduction to the fundamental changes arriving in the Metal API later this year: metalbyexample.com/metal-4/

🧵 Attempting to render a rainbow simply by path tracing millions of rain drops. It's not working well yet... Starting by looking closely at a drop and going through the color spectrum, we can see the diffraction at play: the refracted scene appears to move due to the changing ior.

Fractal SDF rendered as voxel spheres. The high resolution one has close to 1 billion spheres. #metalrt #rendering

Fractals, in situ. #metalrt #rendering #FractalFriday

Fractals, in situ. #metalrt #rendering #FractalFriday

@jbakergraphics.bsky.social has an amazing collection of fractal distance estimators! jbaker.graphics/writings/DEC... All the authors are listed on the page. There are some gems in there! #metalrt #rendering

Renders of an old scene by Maximilian Tarpini. Makes for a fun light study. #metalrt #rendering

I got a pico-mac-nano! Such a cool little device. The 1.5" screen looks awesome. When I was a kid playing on my parents' Mac Plus and read that computers could one day fit in your pocket - *this* is what I imagined it would look like. blog.1bitrainbow.com/pico-mac-nano/

Quick test of participating medium - simplest possible: on primary rays, N% chance of bouncing in a random direction at an arbitrary point between the origin and the intersection. Not a bad result, but I'm disappointed not to see better refracted light trails under the sphere. #metalrt #rendering

Gotta love the amount of detail available in the OSM maps. #metalrt #rendering

Nice little palate cleanser for my mind: easy renders of a few landmarks using OSM data. Some of these are 100M triangles. Plenty of detail in there. #metalrt #rendering

The photon debugging view is working pretty well now. I can navigate the scene to look at the paths, bounces and final photon positions - along with a preview of their impact on the scene. #metalrt #rendering

Here's an idea: shoot some photons and add them to the scene as actual emissive spheres to illuminate it. Couple of drawbacks: it's very slow and it's not very effective. #metalrt #rendering

Want to do a quick photon mapping test, but it's a slow start because I spent most of the time so far playing with the debug rays instead. It does immediately show that the basic GPU hash rand I used is no good. #metalrt #rendering

1/15) 🧵 Breaking down a quick experiment: Simple but slow displacement for ray-traced triangles #MetalRT #rendering Top-left: Typical path-tracer with a simple triangle-based model. Other three: Same model input, with increasing displacement added while tracing the rays.

Quick experiment: Instead of adding each triangle to the BVH, how about adding a bbox for each one and raymarching the triangle inside? It's very very slow, but allows for some fun displacement.

"Self portrait" that looks nothing like me, as a test of a simple subsurface scattering implementation. I was aiming for the classic marble look, but there's plenty of room for improvement... #metalrt #rendering

Halvorsen attractor in Sponza. #metalrt #rendering

Halvorsen attractor. #metalrt #rendering

Halvorsen attractor. #metalrt #rendering

Glass Lorenz attractor. #metalrt #rendering

@xordev.com! I have to grumble at you... I feel that I unfairly lost my glsl-captcha.vercel.app streak because of the low resolution of the previews 🥲 My vision goes funny and I see circles and wiggles where there should be checkered squares 😂 Anyway, that was a fun challenge. Thanks!

Simple variant of the Lorenz strange attractor. #MetalRT #rendering

That's a fun attractor. I gave it a quick try with webgpu and got some nice renders. Steps: copy previous frame into current render target, generate some attractor points into a vertex buffer, draw the points and accumulate into the render target. It's not efficient but it's dead easy. #webgpu

New @brackeys.com video! - Super fun as always. So I tried the lighting tutorial in my toy renderer and got some satisfying results (: youtu.be/aRdiiWpA0AA

Bust of David under different lights. #MetalRT #rendering

Animated time of day on the Sponza scene. #MetalRT #rendering

I've rendered a forgery of the nerdiest photo W.V. has ever taken. #MetalRT #rendering

Saw Sebastian Lague's terrain and thought "yes, but what if smooth and shiny?"

Menger Sponza details. #MetalRT #rendering

Menger Sponza zoom. #MetalRT #rendering

Menger Sponza. #MetalRT #rendering

Level-7 Menger sponge, path traced. #MetalRT #rendering

Non-photorealistic rendering of some classic fractals. #MetalRT #rendering

I've written a blog post about my recent WebGPU particle life simulation adventures! It presents the formulas used for the model & explains how it works under the hood: lisyarus.github.io/blog/posts/p... Below is a gallery of random systems I've found (links to them are in the article) 👇

Published my WebGPU Particle Life simulation online! Obviously it requires WebGPU support, and it's quite resource-demanding, so I've set the particle count to 64k for now. Also it probably doesn't work on mobile; will fix later. Enjoy: lisyarus.github.io/webgpu/parti...

Happy Star Trek day! #may4th 🧌