iiinova — where your digital self keeps evolving

Reposted by Lionel Lemarié

Garrett Johnson @gkjohnson.bsky.social · 27/07/2026

New random sampling method for three-gpu-pathtracer: blue noise dither sampling! It offsets a common random sequence for ALL screen samples, yielding a cleaner image in just a few samples. Screenshots are single sample scrambled sobol vs blue noise. Small writeup below👇

1227

Reposted by Lionel Lemarié

Will Koehler @willk3d.com · 28/05/2026

One of the weirder things I made for Keeper was a faux fractal generator in substance designer. These were used as alphas for sculpting and some VFX. #gameart

210117

Reposted by Lionel Lemarié

Nelarius @nelarius.bsky.social · 24/05/2026

Sharing my tiny #voxel editor app that I've been working on for the past year: polycube.app It has nice-looking color sliders, three different brushes and a #raytracing renderer with a built-in denoiser ✨ Looking to keep updating it, still so many things on the to-do list! 📋

171

Reposted by Lionel Lemarié

nicebyte @nicebyte.bsky.social · 12/04/2026

INTRODUCTION TO SPHERICAL HARMONICS FOR GRAPHICS PROGRAMMERS finally done. gpfault.net/posts/sph.html

gpfault.net

Introduction to Spherical Harmonics for Graphics Programmers

1027886

Reposted by Lionel Lemarié

mamoniem, et al. 🌹♠️🦷🌿 @mamoniem.bsky.social · 08/04/2026

Behind the pretty frames of #PRAGMATA. Breaking down many tricks and hidden gems of the renderer behind CAPCOM's RE Engine. i hope you enjoy & find this few months worth of freetime article useful... mamoniem.com/behind-the-p...

08823

Reposted by Lionel Lemarié

Rune Skovbo Johansen @runevision.bsky.social · 30/03/2026

My erosion filter is out! Video, blog post, and shader source. It emulates erosion without simulation, so it's fast, GPU friendly, and trivial to generate in chunks. Explainer video: www.youtube.com/watch?v=r4V2... Companion blog post: blog.runevision.com/2026/03/fast... #ProcGen #vfx #GameDev

17557169

Reposted by Lionel Lemarié

Jure Triglav @juretriglav.bsky.social · 19/02/2026

The #WebGPU global illumination engine is getting somewhere, now with volumetric light shafts (00:58) and fully destructible environments. Sorry about the mouse cursor, that's how you know it's real, AI would _never_.

0241

Reposted by Lionel Lemarié

David Peipei @davidpei.bsky.social · 18/02/2026

Got some time to spend on the pathtracer denoiser. It's getting there, and the next step is to fix those disocclusion artefacts. I will start working more and more on this project, and share more info hopefully soon! #rust #webgpu

2121

Reposted by Lionel Lemarié

Ipotrick @ipotrick.bsky.social · 04/02/2026

I think most raytracing effects and denoisers don't really think about needs of fast games like shooters. For my RTGI denoiser, i put in a lot of care to get an immediately readable and stable image from the first frame after dis-occlusion. its very satisfying.

1341

Reposted by Lionel Lemarié

Jure Triglav @juretriglav.bsky.social · 29/01/2026

New post on how to do real-time diffuse global illumination using surfels and #WebGPU: juretriglav.si/surfel-based... #threejs

117029

Lionel Lemarié @hikey.org · 22/01/2026

This was a fun quick experiment: Using an old photo I took in the forest, I used ml-sharp to generate gaussian splats from it, voxelized it in my toy renderer, relit the scene dramatically. #rendeting #metalrt

Original: an old photo I took in the forest

3D voxelized scene in the day with volumetric fog.

0264

Reposted by Lionel Lemarié

Amélie Heinrich @dispatchgraph.bsky.social · 20/01/2026

Switched from ImGui to SwiftUI

3172

Lionel Lemarié @hikey.org · 20/01/2026

Coloring a fractal is interesting in itself. Finding good colors is tricky. Applying them to the "right parts" is tricky. Here's a comparison of off-white vs a value that's displaced relative to the folding for each iteration (then mapped to a color ramp). #fractals #rendering #metalrt

$Path-traced render of an off-white folded fractal.$ $Path-traced render of a colorful folded fractal.$

0160

Reposted by Lionel Lemarié

JMS55 @jms5517.bsky.social · 19/01/2026

Ok, so I'm completely stuck trying to debug this. Left is pathtraced reference, right is my realtime renderer. Top row are metals, bottom row are dielectrics, and roughness goes from 0 to 1 left to right.

1182

Lionel Lemarié @hikey.org · 16/01/2026

Render a fractal in 2 easy steps. 1. Render a sphere. 2. Render the rest of the... fractal. #rendering #metalrt

1160

Lionel Lemarié @hikey.org · 16/01/2026

How to render a fractal in two easy steps: 1. Render a fractal. 2. Fold it into a fractal. #rendering #metalrt

1141

Reposted by Lionel Lemarié

Nikita Lisitsa @lisyarus.bsky.social · 31/12/2025

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...

2547

Reposted by Lionel Lemarié

JMS55 @jms5517.bsky.social · 27/12/2025

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

06112

Reposted by Lionel Lemarié

Sebastian Aaltonen @sebaaltonen.bsky.social · 16/12/2025

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".

sebastianaaltonen.com

No Graphics API — Sebastian Aaltonen

Graphics APIs and shader languages have significantly increased in complexity over the past decade. It’s time to start discussing how to strip down the abstractions to simplify development, improve pe...

19475194

Lionel Lemarié @hikey.org · 12/12/2025

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

0346

Reposted by Lionel Lemarié

Cem Yuksel @cemyuksel.com · 11/12/2025

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/

714737

Reposted by Lionel Lemarié

Arseny Kapoulkine @zeux.io · 08/12/2025

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

meshoptimizer.org

🐇 meshoptimizer v1.0

Mesh optimization library that makes meshes smaller and faster to render

924975

Lionel Lemarié @hikey.org · 10/12/2025

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

Path-traced render of the Zorah gltf scene.

1170

Reposted by Lionel Lemarié

Pjbomb2 @pjbomb2.bsky.social · 21/09/2025

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

0162

Reposted by Lionel Lemarié

Sebastian Lague @sebastianlague.bsky.social · 16/08/2025

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?...

youtu.be

Coding Adventure: Ray-Traced Glass and Caustics

YouTube video by Sebastian Lague

619229

Reposted by Lionel Lemarié

Nelarius @nelarius.bsky.social · 04/08/2025

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 ✨

051

Lionel Lemarié @hikey.org · 19/07/2025

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

4424

Lionel Lemarié @hikey.org · 15/07/2025

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

1140

Reposted by Lionel Lemarié

Warren Moore @warrenm.bsky.social · 08/07/2025

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/

metalbyexample.com

Getting Started with Metal 4

Another WWDC is in the books, and with it came a major update to many platform technologies, including Metal. Metal graduated to version number 4, and in this article, we’ll explore the core …

192

Lionel Lemarié @hikey.org · 07/07/2025

🧵 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.

5525

Lionel Lemarié @hikey.org · 06/07/2025

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

1100

Lionel Lemarié @hikey.org · 04/07/2025

@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

1192

Lionel Lemarié @hikey.org · 02/07/2025

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

0231

Lionel Lemarié @hikey.org · 02/07/2025

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/

170

Lionel Lemarié @hikey.org · 01/07/2025

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

0120

Lionel Lemarié @hikey.org · 30/06/2025

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

0160

Lionel Lemarié @hikey.org · 30/06/2025

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

060

Lionel Lemarié @hikey.org · 28/06/2025

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

A single small area light on the back wall is shooting photons into the scene, bouncing through the colored glass dragon and hitting the walls and floor. This is showing a trace of the path of each photon.

Sponza scene, illuminated by 'physical' photons shot from a point light inside a colored glass dragon.

Sponza scene, illuminated by 'physical' photons shot from a point light inside a colored glass dragon. Showing the traced paths.

1172

Lionel Lemarié @hikey.org · 28/06/2025

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

6434

Lionel Lemarié @hikey.org · 27/06/2025

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

Photons are shot from two point lights (a blue and a red one). They are recorded in a buffer, then added to the scene BVH as spheres and thin cylinders, with emission from the flux.

Photons are shot from the area light. The distribution is horrendous and needs a little work.

Photons are shot from the area light. The distribution is tweaked a bit but still bad.

0161

Lionel Lemarié @hikey.org · 24/06/2025

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.

1162

Lionel Lemarié @hikey.org · 19/06/2025

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.

Path-traced bust of David. Displacement is applied to each triangle to add a weird bubbling effect.

Path-traced bust of David. Displacement is applied to each triangle to add a weird strand effect.

Path-traced bust of David. Displacement is applied to each triangle to add a weird colored strand effect.

Path-traced sphere. Displacement is applied to add a weird strand effect.

1130