Light leaks are driving me crazy. World space irradiance cache using spatial hashing. Does anyone have tips to prevent them? Usually happens when ray_t < cell_size, but I haven't found a good way to deal with it. Shrinking the cell size is way too expensive.

just published an experimental crate for doing cuda interop with @bevy.org github.com/tychedelia/b...

Many-lights (100) stress test (not super usable yet, much less with 1000 lights)

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

Dear ImGui now embeds a vector/scalable version of the classic font by default, manually subsetted/optimized so it fits in 18 KB (opt-out possible). Embedding ensures easily and readily usable in all contexts. Should default to new one on most setups. Here's a compare of both. #ChristmasMiracle

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".

Blog post: Cheap ray-tracing using only acceleration structures. No ray pipelines, no shader binding tables, no textures. anki3d.org/minimalist-r...

Solari is looking pretty good after the latest round of changes! Realtime vs pathtraced reference

Real life has kept me from posting, but I've still been hard at work on Bevy Solari! It now supports specular materials, and has a _way_ improved world cache! Realtime vs pathtraced reference

Very excited to present a few interesting bits about the rendering of #DOOM: The Dark Ages together with @domlaz.bsky.social and @martinfuller.bsky.social . If you happen to attend #GPC2025 next month, feel free to say hello!

Bevy 0.17 is out now! It features Raytracing, Improved Observers / Events, UI Widgets, Rust Hotpatching, Light Textures, DLSS, Tilemap Chunks, Web Assets, Reflect Auto-Registration, UI Gradients, Raymarched Atmosphere, Virtual Geometry BVH Culling, and more! bevy.org/news/bevy-0-17

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...

Exciting news for developers working with our AMD DGF geometry compression technology! 🗜️ The DGF SDK has been updated with a new animation-aware encoding pipeline, bug fixes, and improvements. 👉 Learn more and download: gpuopen.com/learn/animat...

New blog post: "Realtime Raytracing in Bevy 0.17 (Solari)" jms55.github.io/posts/2025-0...

New blog post: "Bevy's Fifth Birthday - Progress and Production Readiness" jms55.github.io/posts/2025-0...

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.

meshoptimizer v0.25 is out! Featuring new simplification function that optimizes positions and attributes for appearance, experimental permissive mode to simplify faceted regions with selective seam preservation, regularization option for improved tessellation quality and deformation, multiple ...

New tutorial blog post! Environment and Light in Godot: Setting Up For Photorealistic 3D Graphics hexaquo.at/pages/enviro... I've been meaning to write this for a while, both as an overview over Godot's Environment, and as an entry point to realistic 3D graphics. #godot #gamedev

Realtime raytraced DI/GI

crates.io/crates/dlss_... Just published my open source crate for using DLSS in wgpu! Supports both super resolution and ray reconstruction. Also look forward to DLSS support in the upcoming Bevy 0.17 release!

Anyone used DLSS-RR with ReSTIR GI before? How do you prevent DLSS-RR from thinking that correlated noise from ReSTIR GI is detail that needs to be preserved?

Today is Bevy's fifth birthday! As always, I've used this as a chance to reflect on the past year and outline my hopes and dreams for the next year of #bevy: bevy.org/news/bevys-f...

~14ms

Added DLSS Ray Reconstruction to Bevy Solari! It's kind of fun to look at the profile, I _think_ this is a series of upsample/downsample convolutions for a U-net, but who knows!

Trying to upload this again, radiance cache: github.com/bevyengine/b...

So subgroups are a bust, which is a shame because they were cheap. But they didn't have enough samples to reduce correlations. So I tried workgroup-level resampling, which is mostly artifact free. Greatly improves quality! ...At double the cost (6.4->12ms) :( Left is main, right is workgroup.

Tried doing ReSTIR spatial reuse within a subgroup today. This is the result - super good quality, but with tiling artifacts. I tried jittering the thread ID to get subgroups to overlap across frames, and it helped a bit, but didn't entirely eliminate the artifacts :(

Realtime, no denoising besides TAA :)

registry.khronos.org/vulkan/specs... 👀

Added a radiance cache, and initial results show it _halved_ my ReSTIR GI time (8.62ms -> 4.32ms) in bistro! Also improved disocclusion quality a lot. The downside is that it's more temporally unstable and has some artifacts due to using a fixed sample point per voxel.

Implemented (with a lot of help) balance heuristic for ReSTIR GI spatial resampling. Spent so long fighting NaNs - turns out it was due to an unclamped dot product 🙃. Balance heuristic helps a _ton_ though! Greatly reduces jacobian correlations, way more than rejecting jacobians does.

Just pushed a technique to avoid too many BLAS builds for continuous cluster-based LoD ray tracing. Thanks to Pyarelal Knowles whose instance merging idea was a precursor to this solution and helped on debugging. github.com/nvpro-sample...

All my raytracing shaders (compute with inline RT, not RT pipelines) have ~60% occupancy. High register count is the issue, because of the instance -> vertex/material data lookups. Anyone know how to make this take less registers? github.com/bevyengine/b...

Specular! (PT, not realtime)

I have a new article! It took a long time but I think it was worth it, hopefully you'll enjoy it too. www.elopezr.com/the-art-of-p... Many thanks to @vassilis3d.bsky.social, @mokarakaya.bsky.social‬ and @angelortiz.bsky.social‬ for the help and encouragement

This is neat

After like 3 years, I finally got usable realtime, fully dynamic fully raytraced lighting in Bevy!

ReSTIR GI was shockingly easy to get started on. With initial + temporal resampling (no spatial yet) it was pretty much a copy + paste of the DI code with some small adjustments. Didn't really expect to get this far so quickly!

After a bunch of work, re-enabled the directional light and added TAA, and it's starting to look great! @gpuopen.bsky.social's paper gpuopen.com/download/Eff... in particular was a big quality increase, for a simple change.

All HPG 2025 papers are now available on the EG digital library. CGF papers: diglib.eg.org/handle/10.23... Conference papers: diglib.eg.org/handle/10.23... It has been a huge honor to act as HPG papers chair and guest editor and I look forward to an exciting program in Copenhagen.

meshoptimizer 0.24 is out! Featuring new meshlet builder for raytracing workloads, improvements to cluster partitioning, new functions for reindexing, simplification, clustering and coverage computation, many internal improvements and, of course, VS2013 support!

Hardware Accelerated Neural Block Texture Compression with Cooperative Vectors Belcour Laurent, Benyoub Anis @Auzaiffe (Intel Labs, France) Paper: arxiv.org/abs/2506.06040 Project: ggx-research.github.io/publication/... Video: youtu.be/8sy3QP1R-p8?... Code (MIT): github.com/GameTechDev/...

New papers day! Preprints of our „GATE: Geometry-Aware Trained Encoding“ to be presented at HPG and „Neural Visibility Cache for Real-Time Light Sampling“ currently on Arxiv are available here: boksajak.github.io/blog/Preprin... Kudos to co-authors Daniel Meister and Carsten Benthin. Enjoy!

Slowly working on ReSTIR. Keeping things unbiased gets really complicated, really fast! I have spatial reuse done, working on temporal. At this rate I'm hoping to get raytraced direct lighting into Bevy 0.17, although it'll probably depend on how long it takes me to polish the DLSS integration.

Hot patching #RustLang code? In my #BevyEngine? github.com/bevyengine/b... was just merged! Thanks to subsecond from #Dioxus, coming to Bevy 0.17, and already on main!

Excited to finally show off Nanite Foliage www.youtube.com/watch?v=FJtF...

Spent some time yesterday prototyping what component categories would look like for the Bevy editor. Figma's autolayout is pretty cool, but also very finicky sometimes. I think that this design is ultimately a dead-end, the nesting leads to the same issue with usability that I feel Godot has.

New blog post discussing Async Compute, various experiments with pairings and task overlapping and performance impact. interplayoflight.wordpress.com/2025/05/27/a...

I don't usually post about individual PRs, but I've just opened the first PR for raytracing support in Bevy. I'm very excited that this is finally happening! github.com/bevyengine/b...