More testing with the Markov chain path guiding

#GPU #graphics folks, say I want a GPU-side concurrent hash table, and the API only supports 32-bit atomics. It's easy if keys are also 32-bit, but what if I want some complex keys (say, a struct)? Can I do this and how?

Oh also have this

Have this

So it’s a bit old now but i found a major bug with my light acceleration structure TLAS, and testing adding bitfield for BLAS(left is old, right is new) The bitfield is now fully implemented(with a fallback for depth > 32) and various other improvements have been made

DX12 Bindless Plugin for Unity3D is now open source, and you can use it in your projects! Can be useful for writing a custom GPU Driven Renderer. (github below)

Some more shots by Yanus now that I’ve fixed some caustic stuff(was missing the pdf calculation for my guiding CDF…) 100% pathtraced and rendered in unity using purely TrueTrace

Some progress on implementing Projected Displacement Mapping, still have the issue with triangle boundaries, which is partly due to triangle winding order…

Has anyone ever implemented "Projective Displacement Mapping for Ray Traced Editable Surfaces"? If so, can I get some help? I cant solve these offsets between triangle boundaries for the life of me and I am totally stuck again(this is exactly what stopped me last time),any tips?

Just stumbled upon this ancient PcPersective article on real-time ray tracing.. In 2008. :) pcper.com/2008/06/ray-... It details the story of nine students (Karim, Wussie, Rick, Jan, Rutger, Trevor, Mathijs, Roel, Wilco) who worked in various roles on CPU-ray traced games using the Arauna engine.

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

Forgot to post these From some improvements to my caustic photon mapper tacked into truetrace last week

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.

TinyBVH 1.6.7 is now available on the main branch. Changes: * TinyBVH now only needs C++11 (tiny_ocl.h needs C++17) * Full-sweep SAH builder is now threaded * Fix for crash in BuildAVX Still zero dependencies. :) And: The repo reached 1k stars! Link: github.com/jbikker/tiny...

I am glad to attend #HPG2025 where I just presented our paper "Fused Collapsing for Wide BVH Construction", co-authored with Mathias Paulin. We propose a fast build algorithm for wide BVHs that directly computes a wide hierarchy without additional collapsing pass. Webpage: wbrbr.org/publications...

Rendering nerds! Check out our latest work "Vector-Valued Monte Carlo Integration Using Ratio Control Variates" that has just gotten the best paper award at SIGGRAPH 2025. This paper presents a method that reduces variance of a wide range of rendering and diff. rendering tasks with negligible cost.

A Fluorescent Material Model for Non-Spectral Editing & Rendering Belcour Laurent, Fichet Alban, Barla Pascal (Intel Corp. France, Inria Bordeaux) arxiv.org/abs/2505.19672

O wow, ReSTIR keeps giving. Awesome stuff.

Vlad Erium 🇯🇵@shamanix.bsky.social · last yr.

Histogram Stratification for Spatio-Temporal Reservoir Sampling Corentin Salaün, Martin Bálint, Laurent Belcour, Eric Heitz, Gurprit Singh and Karol Myszkowski (Max Planck Institute for Informatics, Germany & Intel, France) iribis.github.io/publication/...

Saw that "The Witcher 4" UE5 tech demo with the voxel trees for fast rendering at a distance? I figured... that should be easy to do in TinyBVH. :) So now TinyBVH can do voxel meshes. Attached video: CPU-only, switching between BVH and voxels. Code in tiny_bvh_foliage.cpp: github.com/jbikker/tiny...

Now available: A blog post on (S)BVH optimization. The article describes how to improve beyond SBVH quality, often significantly. Results are compared to full-sweep, binned SAH and the H-PLOC. In short: Off-line BVH construction can double ray tracing performance. jacco.ompf2.com/2025/05/20/b...

Added tri presplitting thanks to BoyBayKiller Before vs after tri presplitting(splitting triangles before doing ANY building, vs SBVH which splits DURING build), only affects SWRT Tri count jumped from 2832120 triangles to 3348607 triangles

Here is a new blog post of mine, where I dive deep into the theory and math behind ReSTIR GI. Big thanks to Markus Kettunen for verifying the theory, reviewing the article, and catching a key detail I had missed. agraphicsguynotes.com/posts/unders...

Understanding The Math Behind ReSTIR GI

Recently, I had the pleasure of contributing to Nvidia’s Zorah project, the flagship demo for the RTX 50 Series GPUs. My primary role was to provide technical support for light transport in Zorah, whi...

agraphicsguynotes.com

That's great news! Very interesting work.

Lucas Alber@lalber.bsky.social · last yr.

Thanks for your interest! We have published the paper and code in the meantime. You can find everything on our project page www.lalber.org/markov-chain...

Progress on the quest to the Ultimate BVH. Two observations: 1. You can optimize a BVH, using "Fast Insertion-Based Optimization". 2. "Spatial Splits" (SBVH) beats an optimized BVH, narrowly. Two challenges: 1. SBVH practically must use binning 2. SBVH doesn't benefit from optimization. Now what?

pathtraced Audio vis thing, but as usually I dont have enough ideas to take it very far ASVGF is doing a bit of smear, but honestly not as much as I woulda thought

And another one from Yanus playin with the photon mapper I’m playing with in truetrace

Behold! First speed! Some experiments from Yanus with the photon mapper I am playing with in truetrace