iiinova — where your digital self keeps evolving

Pjbomb2 @pjbomb2.bsky.social · 12/10/2026

how does bonsaid builds compare in trace and build speed compared to just like cwbvh with tri presplitting?

Pjbomb2 @pjbomb2.bsky.social · 01/09/2026

Ohhh so it wasn’t the cwbvh traversal itself It was just better quality builds? Been trying to look through your commits but finding it hard to find

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Pjbomb2 @pjbomb2.bsky.social · 01/09/2026

What changes got made to the cwbvh that improved its speed so much? Does it differ now from the origional implementations, or was it a fix?

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Pjbomb2 @pjbomb2.bsky.social · 26/04/2026

I so wish my college had classes like this

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Pjbomb2 @pjbomb2.bsky.social · 26/04/2026

Also I agree, he is awesome lol The blog at the bottom of the sea has so many amazing little resources on many things!

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Pjbomb2 @pjbomb2.bsky.social · 26/04/2026

Ah sorry this has been resolved, but I don’t remember what the fix was It works great now tbh!

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Pjbomb2 @pjbomb2.bsky.social · 25/04/2026

More testing with the Markov chain path guiding

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Nikita Lisitsa @lisyarus.bsky.social · 12/11/2025

#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?

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Pjbomb2 @pjbomb2.bsky.social · 31/10/2025

Packing is used in a couples places in truetrace And each emissive triangle is it’s own light source, as the triangle itself is a light

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Pjbomb2 @pjbomb2.bsky.social · 31/10/2025

At its core, the bit trails are just a string a 1’s and 0’s that tell me which direction to traverse the tree at any given branch to reach a specific triangle(those triangles are at the “leaves” of the tree)

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Pjbomb2 @pjbomb2.bsky.social · 31/10/2025

These bittrails that I talk about here in the origional post are used to traverse the light acceleration structure while gaurenteeing the triangle we will end at in the tree So I can compute the correct weight quickly for any emissive triangle randomly hit by bouncing rays

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Pjbomb2 @pjbomb2.bsky.social · 31/10/2025

The structure makes sampling emissive triangles far better/higher quality for Next Event Estimation However, rays can also randomly hit an emissive triangle by chance, in which case we need to compute a weight so that NEE still is correct when combined with naive Another reply incomming

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Pjbomb2 @pjbomb2.bsky.social · 31/10/2025

So this is a bit of a specialized case for bitfield They have a LOT of uses, like bitflag packing(which I use for my materials, I can pack 32 booleans into 1 uint of space) For this specifically, it’s used for the light acceleration structure I use Need more space, so this will be several replies…

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Pjbomb2 @pjbomb2.bsky.social · 31/10/2025

So actually there were 2 major bugs that were 4+ months old that caused massive amounts of fireflies First one was I forgot a “- 1” in my tlas bitfield traversal Second was I was double counting mesh count contribution to the pdf, this ones over a year old

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Pjbomb2 @pjbomb2.bsky.social · 31/10/2025

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

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Meetem @meetem.bsky.social · 11/10/2025

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)

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Pjbomb2 @pjbomb2.bsky.social · 10/10/2025

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

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Pjbomb2 @pjbomb2.bsky.social · 02/10/2025

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

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Pjbomb2 @pjbomb2.bsky.social · 02/10/2025

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?

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Jacco Bikker 🎦 @jbikker.bsky.social · 18/09/2025

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.

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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

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Pjbomb2 @pjbomb2.bsky.social · 15/09/2025

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

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Christoph Kubisch @pixeljetstream.bsky.social · 10/09/2025

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.

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

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Jacco Bikker 🎦 @jbikker.bsky.social · 05/09/2025

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...

github.com

GitHub - jbikker/tinybvh: Single-header dependency-free BVH construction and traversal library.

Single-header dependency-free BVH construction and traversal library. - jbikker/tinybvh

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Wilhem Barbier @wbrbr.bsky.social · 23/06/2025

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...

wbrbr.org

Fused Collapsing for Wide BVH Construction

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Tzu-Mao Li @tzumaoli.bsky.social · 14/06/2025

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.

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Vlad Erium 🇯🇵 @shamanix.bsky.social · 19/06/2025

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

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Pjbomb2 @pjbomb2.bsky.social · 19/06/2025

Yoooo what?? I thought opacity micro maps were kinda locked down black box to an extent, or needed dedicated hardware to be faster!

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Jacco Bikker 🎦 @jbikker.bsky.social · 19/06/2025

O wow, ReSTIR keeps giving. Awesome stuff.

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Pjbomb2 @pjbomb2.bsky.social · 18/06/2025

What’s the speed vs a pure bvh like?

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Jacco Bikker 🎦 @jbikker.bsky.social · 13/06/2025

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...

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Jacco Bikker 🎦 @jbikker.bsky.social · 20/05/2025

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...

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Pjbomb2 @pjbomb2.bsky.social · 12/05/2025

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

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Jiayin Cao @jiayincao.bsky.social · 10/05/2025

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...

agraphicsguynotes.com

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...

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Jacco Bikker 🎦 @jbikker.bsky.social · 30/04/2025

That's great news! Very interesting work.

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Jacco Bikker 🎦 @jbikker.bsky.social · 22/04/2025

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?

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Pjbomb2 @pjbomb2.bsky.social · 26/04/2025

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

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Pjbomb2 @pjbomb2.bsky.social · 21/04/2025

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

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Pjbomb2 @pjbomb2.bsky.social · 21/04/2025

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

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Jacco Bikker 🎦 @jbikker.bsky.social · 17/04/2025

Grading for Y1/Block C @ Breda University is complete. Our students used path tracing, BVHs, reprojection, blue noise, post-processing, importance sampling, MIP-mapping, bilinear interpolation and tons of other ingredients to build a CPU ray tracer + game. Behold, the gamedevs of 2028!

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Pjbomb2 @pjbomb2.bsky.social · 18/04/2025

Baby’s first photon mapper!

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Pjbomb2 @pjbomb2.bsky.social · 10/04/2025

1 sample per pixel and 2.6k samples per pixel(cuz glass takes awhile)

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Pjbomb2 @pjbomb2.bsky.social · 10/04/2025

well somethings happened No denoiser except for occasionally TAA Just raw restir for the most part

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