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Pjbomb2

@pjbomb2.bsky.social

240 followers 64 following 64 posts

Just a guy who likes to learn and play with graphics, with a focus on realtime pathtracing. I enjoy chatting/messages! Always looking for new opportunities Github: https://github.com/Pjbomb2/TrueTrace-Unity-Pathtracer

github.com

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Pjbomb2 @pjbomb2.bsky.social · May 17

Thought I should maybe start here finally
Discord server for TrueTrace here:
discord.gg/4Yh7AZuhcD

Join the TrueTrace Discord Server!

Check out the TrueTrace community on Discord - hang out with 277 other members and enjoy free voice and text chat.

discord.gg

Pjbomb2 @pjbomb2.bsky.social · 8d

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 · 8d

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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Reposted by Pjbomb2

Jacco Bikker 🎦 @jbikker.bsky.social · 21d

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 · 18d

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 · 24d

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

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Reposted by Pjbomb2

Christoph Kubisch @pixeljetstream.bsky.social · 29d

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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Reposted by Pjbomb2

Jacco Bikker 🎦 @jbikker.bsky.social · Sep 5

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

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

github.com

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Reposted by Pjbomb2

Wilhem Barbier @wbrbr.bsky.social · Jun 23

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...

Fused Collapsing for Wide BVH Construction

wbrbr.org

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Reposted by Pjbomb2

Tzu-Mao Li @tzumaoli.bsky.social · Jun 14

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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Reposted by Pjbomb2

Vlad Erium 🇯🇵 @shamanix.bsky.social · Jun 19

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 · Jun 19

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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Reposted by Pjbomb2

Jacco Bikker 🎦 @jbikker.bsky.social · Jun 19

O wow, ReSTIR keeps giving. Awesome stuff.

Vlad Erium 🇯🇵 @shamanix.bsky.social · Jun 19

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/...

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Pjbomb2 @pjbomb2.bsky.social · Jun 18

What’s the speed vs a pure bvh like?

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Jacco Bikker 🎦 @jbikker.bsky.social · Jun 13

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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Pjbomb2 @pjbomb2.bsky.social · Jun 4

Reposted by Pjbomb2

Jacco Bikker 🎦 @jbikker.bsky.social · May 20

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 · May 12

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

Reposted by Pjbomb2

Jiayin Cao @jiayincao.bsky.social · May 10

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

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Jacco Bikker 🎦 @jbikker.bsky.social · Apr 30

That's great news! Very interesting work.

Lucas Alber @lalber.bsky.social · Apr 30

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...

Real-Time Markov Chain Path Guiding for Global Illumination and Single Scattering - LALBER.ORG

We present a lightweight and unbiased path guiding algorithm tailored for real-time applications with highly dynamic content. The algorithm demonstrates effectiveness in guiding both direct and indire...

www.lalber.org

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Reposted by Pjbomb2

Jacco Bikker 🎦 @jbikker.bsky.social · Apr 22

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 · Apr 26

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

Pjbomb2 @pjbomb2.bsky.social · Apr 24

TRAINS

Pjbomb2 @pjbomb2.bsky.social · Apr 22

Scene from here: assetstore.unity.com/packages/3d/...

Coffee Shop Environment | 3D Environments | Unity Asset Store

Elevate your workflow with the Coffee Shop Environment asset from Leartes Studios. Find this & other Environments options on the Unity Asset Store.

assetstore.unity.com

Pjbomb2 @pjbomb2.bsky.social · Apr 22

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Pjbomb2 @pjbomb2.bsky.social · Apr 21

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