Mikkel Gjoel

From profiling to kernel patch: the journey to an eBPF performance fix | Ritesh Oedayrajsingh Varma A story about how an innocent profiling session led to a change to the Linux kernel that makes eBPF map-in-map updates much faster.

New article! What do you do when profiling your code shows the slowdown isn't in your code, but deep in the kernel? Why, you grab the kernel source and go spelunking.

How a routine profiling session turned into a Linux kernel patch: rovarma.com/articles/fro...

A rendering of the LTC technique implemented in Gigi

The render graph of the LTC implementation

The Gigi viewer showing the LTC implementation running

Real-Time Polygonal-Light Shading with Linearly Transformed Cosines

Adam Badke implemented LTC in Gigi and it is now in the Gigi browser.

Adam's Repo: github.com/b1skit/LTCAr...

LTC paper: eheitzresearch.wordpress.com/415-2/

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

This is Sektori! A twin-stick shooter I've been making (and documenting the journey) since April 2021. And it finally launched TODAY on Steam, PS5 and Xbox! Here's a fresh launch trailer, all shares highly appreciated. More game info in replies.

#indiegame #ps5 #xbox #steam #indiedev #gamedev

All Sources of DirectX 12 Documentation - a new post on my blog
asawicki.info/news_1794_al...

Here's some cute bounding box functions for 2D shapes. A longer list here: iquilezles.org/articles/bbo...

RGB rendering is founded on lies and perpetuated by misconceptions about the practicality of spectral rendering. My new blog post series describes a spectral GPU path tracer. Part 1 focuses on how to make it work with existing RGB assets.
momentsingraphics.de/SpectralRend...

New blog post! Behind the scenes of some of the techniques involved in making our last PC demo 💫 gboisse.github.io/posts/this-i...

New blog post! In "Billions of triangles in minutes" we'll walk through hierarchical cluster level of detail generation of, well, billions of triangles in minutes. Reposts welcome!

zeux.io/2025/09/30/b...

#SIGGRAPH2025 Advances in Real-Time Rendering in Games course talks slides posted: "Adaptive Voxel-Based Order-Independent Transparency" shipping in the upcoming Call of Duty: Black Ops 7 by Michal Drobot from Activision Central Tech is now online: advances.realtimerendering.com/s2025/index....

GM Shaders Mini: Tonemaps How to conquer washed out lights and ugly color banding

mini.gmshaders.com/p/tonemaps

Profile.

Computer graphics image of a classical building with intricate geometric details in ornaments. Rendering and scene statistics

Anpther major update to our cluster lod ray tracing sample.
Zorah scene available as glTF
raw.githubusercontent.com/nvpro-sample...
BLAS caching github.com/nvpro-sample... BLAS merging github.com/nvpro-sample...

Special thanks to Adam Marrs, Pyarelal Knowles for ideas and Chris Perrella for zorah.

Ten Years of D3D12 For those of us that have been using it from the start, it can be hard to believe that Direct3D 12 has been around for nearly ten years now. Windows 10 was released on July 29th 2015, and D3D12 has be...

I've got a new blog post for all of you fine folks! It runs through the additions to D3D12 since it was released, and finishes up with some of the things that have changed for me personally in my code.

(And yes it's really been 10 years 👴).

therealmjp.github.io/posts/ten-ye...

Slides from my SIGGRAPH 2025 and CEDEC 2025 talks “Fast as Hell: idTech 8 Global Illumination”, are now publicly available through the Advances in Real-Time Rendering in Games course. Lecture recordings will be available soon on the course's YouTube channel.

#SIGGRAPH2025 Advances in Real-Time Rendering in Games course talks slides online: "Ray Tracing The World of Assassin’s Creed Shadows" by Luc Leblanc and Melino Conte from Ubisoft is now online: advances.realtimerendering.com/s2025/index....

MegaLights slides were just posted online. There's a bunch of details in slide notes if you're curious how our new Stochastic Direct Lighting solution works, why we made it and want to learn a bit about the problem space.

#SIGGRAPH2025 Advances in Real-Time Rendering in Games course slides for "Fast as Hell: idTech8 Global Illumination” talk by @idsoftwaretiago.bsky.social from @idsoftware.bsky.social
are now online
advances.realtimerendering.com/s2025/index....

SIGGRAPH 2025 links: blog.selfshadow.com/2025/08/15/s.... I'll be adding more soon. Let me know if I'm missing anything.

A Texture Streaming Pipeline for Real-Time GPU Ray Tracing Disney Animation makes heavy use of Ptex [Burley and Lacewell 2008] across our assets [Burley et al. 2018], which required a new texture streaming pipeline for our new real-time ray tracer. Our goal was to create a scalable system which could provide a real-time, zero-stall experience to users at all times, even as the number of Ptex files expands into the tens of thousands. We cap the maximum size of the GPU cache to a relatively small footprint, and employ a fast LRU eviction scheme when we hit the limit.

The short paper and talk materials can be found here:

www.yiningkarlli.com/projects/gpu...

Most of the slides and course notes for the SIGGRAPH 2025 Physically Based Shading in Theory and practice course are now online, with more to follow:
blog.selfshadow.com/publications...

A log/log error graph of Monte Carlo integration of the function y=x between 0 and 1, using a couple different sampling strategies.

Toroidally Progressive Stratified Sampling in 1D
New Blog Post! See how to use a low discrepancy shuffler to make stratified sampling toroidally progressive.
blog.demofox.org/2025/08/03/t...

Anisotropic perlin noise on Suzanne

New at #SIGGRAPH2025:

Can we make Perlin Noise stretch along some underlying vector field? Well it turns out it's possible with two simple additions to the original method! No need for advection or convolutions.

Find the paper and implementations here:
github.com/jakericedesi...

GitHub - jakericedesigns/SteerablePerlinNoise: Implementations of "Steerable Perlin Noise" as presented at Siggraph 2025 Implementations of "Steerable Perlin Noise" as presented at Siggraph 2025 - jakericedesigns/SteerablePerlinNoise

One of my coworkers, @tearsofjake.bsky.social, has a talk at SIGGRAPH this year about this really cool steerable perlin noise technique that was used on Moana 2. He's just posted some handy reference implementations for Houdini, Unity, Godot, and Blender; check it out!

github.com/jakericedesi...

Any of my moots (or non-moots) who happens to have experience with using surfels and lightprobes for rendering, and wouldn't mind me asking incredibly dumb questions about them?

#geogram + #graphite + #blender Python scripting = robust CSG directly available in Blender !
Everything is a numpy array.

YouTube video by High-Performance Graphics The Future of Analytical Materials in a Neural World

Amazing talk about Neural Materials. Lots of insight - from why layered materials are important to an overview of current neural solutions and their tradeoffs: youtu.be/xUnXPNFWJUY?...

All REAC 2025 content is LIVE! Enjoy enginearchitecture.org/2025.htm

I did a presentation on the system we used for Brink at the OpenGL BOF at Siggraph 2011 loopit.dk/preferred.pdf . It was a bit different to Rage in that there were no restrictions on texture-reuse, and it allowed uv-wrapping. Not too many details in the presentation though...

Another 🧵 on (almost) everything (interesting) about evaluating distances and closest points to quadratic Bezier curves