Jacco Bikker
@j_bikker
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Ex-game developer, ex-rasterizer, now doing ray tracing, low-level optimization and lecturing about it for fun and profit. Mostly for fun though! C+/"Sane C++".
Houten, The Netherlands
Joined September 2011
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New blog post: proper BVH construction, starting with the basics, with (sane C++) source code. Plan is a series of articles; this is the first one.
Up next: SAH, ordered traversal.
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Two of my students (August van Casteren,
Shreyes Jishnu Suchindran) handed this in for the final assignment of the Advanced Graphics course. Every vertex of a 250K dragon was replaced by... a dragon. 60fps, 1080p, uses C# -> OpenTK -> compute shaders. I'm speechless.
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What are the odds. Apparently some glass doors are oriented just right to cause the sun to reach an office via multiple specular bounces. Turner Whitted would approve. Via:
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In 2010 I wrote a blog post about efficient trilinear interpolation on the GPU by exploiting direct manipulation of the bits of a floating point number for fast evaluation of 2^x:
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The final episode of the tutorial on BVH construction is now available:
This time: GPU TLAS&BLAS, applied to a massive scene, CL/GL interop for faster frames. Code on Github, as usual:
This is the end... for now. Thanks for reading!
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Descent Raytraced - Version 1.0.0 Release
Download here:
More info in the release announcement on reddit:
Awesome job by a talented group of
@BuasGames
#ThisIsIGAD
students!
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I am going to write a path tracer in a couple of tweets. I will comment on each to clarify the functionality and some decisions. Brevity is key here, so sacrifices are made for that. Correctness is not one of those however.
(1/2^4)
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I never realized MIP mapping makes so much more sense with three separate bitplanes. Look at that nicely filled quad. :)
Oldies but goldies: Lance Williams, Pyramidal parametrics, 1983. Introduces the idea of mip-mapping to reduce aliasing for 3D textured rendering.
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Part 2 of Probability Theory for Physically Based Rendering is now available:
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2019 article on "Probability Theory for Physically Based Rendering":
Attempt to make this topic accessible to a broad audience. Got my site severely slashdotted. :)
There's a PART2 as well:
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Episode 6 in the series on real-time Voxel Ray Tracing in C++ is now available:
This time: Path Tracing. Including: BRDF & pdf, the random bounce, cosine-weighted bounce and verifying ground truth.
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Article 6 on constructing a BVH for animated scenes (on the CPU, in sane C++) is under construction. In the meantime, the first 5 articles are now available. In case you missed any of them:
(and two more!)
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At the risk of boring many of my followers, here's a pure c ray tracer in 479 characters, including the
#includes
and mandatory \n's following those; excluding the clarifying remarks. In two tweets!
Based on the work by
@aaed3r
/
@Kweepa
(via
@bbcmicrobot
). Added a few tricks. :)
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The pica pica scene loads. Rendered here without RTX, pure path tracing, filtered with SVGF, 1spp at 1280x720.
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Replication of a scene by M.C. Escher, rendered in Lighthouse 2: small scene (<12k tris) reflected in a metal ball. Scene has mirrors at the end of each hallway to obtain the infinite hallways.
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Episode 3 of the Voxel Ray Tracing in C++ series is now available:
This time: stochastic techniques; anti-aliasing, the accumulator, soft shadows. And: scene loading.
Viking outpost scene credit: PabloDebusschere / Sketchfab.
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The Lighthouse 2 rendering framework for real-time ray tracing / path tracing R&D is now open source:
Modules for Optix and Optix Prime are available now; Embree & OpenCL will follow later.
A proper blog post will follow shortly.
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20k dragons in a flock, ray traced of course, without RTX. Work in progress; functionality is ready but things need to be optimized.
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The first article in a new "intermediate" series on Ray Tracing with Voxels is now available:
Topics:
1. Lights and shadows
2. Whitted-style
3. Stochastic techniques
4. Noise reduction
5. Reprojection
6..9: ?
One article per week, until I run out!
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The second episode in the series on Voxel Ray Tracing in C++ is now available:
In this episode we add recursive reflections and refraction with Snell's law and Fresnel. With the included template, everything runs in real-time on your CPU.
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Episode 4 of the series on Voxel Ray Tracing in C++ is now online:
In this episode: improving soft shadows using stratification and blue noise.
As always, it starts with the template, available from Github:
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#raytracethis
. A plane breaking the sound barrier, via . I have no idea what causes the diffraction (?).
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Update to the voxel engine: pure image based lighting, better 'short ray GI', and (basic) TAA. Together it seems sufficient (in most cases) for low-noise light, while reaching 120+ fps on a 2070. Git repo will be updated shortly.
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I made a ray tracer. In Rust.
;)
Compared to this Vulkan code looks compact. I must be doing something wrong.
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Made a quick blog post about reprojection without camera matrices, which is easy to use in a ray tracer. The method uses the view pyramid of the previous frame instead:
Probably not new, so if you have seen it before, let me know, so I can reference.
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Preparing episode 6 for the Voxel Ray Tracing in C++ series, of which the first 5 episodes are available on my blog:
Path tracing requires a tiny algorithm, but it produces some stunning results. Hopefully the article is done on Wednesday.
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More great SIGGRAPH'24 papers on Ke-Sen Huang:
Realtime Path Guiding Using Bounding Voxel Sampling
Temporally Stable Metropolis Light Transport Denoising using Recurrent Transformer Blocks
Practical Error Estimation for Denoised Monte Carlo Image Synth.
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New in Lighthouse 2: optionally rendering without NEE (just IBL, reaching 10+ spp @ 1920x1080, 40Hz); increased max samples per pixel; new demo app (WIP); fixes to the animation system and Optix7 top-level hierarchy handling. Model by Robert Jordan, via .
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Ancient research on ray tracing and games. :) Pretty much my first exposure to academia, thanks Carsten Wächter, Alexander Keller and Per Christensen for RT'07!
Link to paper:
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Article 9b on proper BVH construction is taking a bit longer than expected - because it's long! In the meantime, you can find the in-progress code, with working TLAS/BLAS, on github:
It's fast too, and doesn't require RTX, just an OpenCL-capable GPU.
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Allow me to post something personal:
Today is a special day: me my wife Karin have been married for 10.000 days. :) Since our 25th anniversary was spoiled last-minute by COVID, we're celebrating this today. Love her very much, can't wait to see what the next 10k will bring!
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"Ray Tracing is the future and ever will be", they said. It is a message of hope! 2022 may, in fact, be the year of Rust, Linux on the desktop, James Webb, and the defeat of Covid. Keep dreaming, keep tracing, in Rust, on Linux, vaccinated, or in 2023.
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Advanced Graphics
@UUBeta
/
@UniUtrecht
starts tomorrow! In this course we cover light transport, acceleration structures (
#RTXOff
all the way!), probability theory and recent advances in filtering & sampling. This year I'm teaching with Dr. Peter Vangorp. Looking forward to it!
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8192x512x8192 voxels ray traced at approx. 25fps on an i5 6500. Pure CPU renderer. Voxels are compressed to octree chunks, which are un/recompressed at runtime for editing. Voxel sprite globe has its own coordinate system.
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Still working on the demo/benchmark. Now has far lower RMSE: the 8spp version is approaching the quality of what used to be 24spp. Performance also got better; fps for 10spp now equals fps for 8spp in the released demo. Will try to post an updated demo later this week.
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Happy to announce that tomorrow will be my first day at
@TraverseBreda
! Looking forward to doing R&D with
@JasperBekkers
and friends - many of them former students. I'll be old, but wise. I hope.
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Added an introduction to probability theory for physically based rendering to my blog:
This is part 1 of 2; part 2 will discuss the application of the theory to rendering.
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New lighthouse 2 release. Now reaches 4 paths per pixel @ 1920x1080, 30Hz on RTX2070 Max-Q. Added: asynchronous rendering for CPU-side scene updates during GPU path tracing. Next target: 5 paths per pixel. Shading taking 70+% of the frame time...
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New episode (number 5 already!) in the series on Real-time Voxel Ray Tracing in C++:
This time the topic is reprojection. This is a complex topic and thus a lengthy episode.
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The "Voxel Ray Tracing in C++" series is on Graphics Programming Weekly for the third time in a row! More coming this week. :)
Graphics Programming weekly - Issue 339 - May 12th, 2024
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ARM NEON SIMD is gorgeous. Got the popular SSE slab test for ray/AABB intersection down to this (with the original code still there for reference). Needless to say, this is *a lot* faster.
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Our
@BuasGames
year 1 students explored modern ray tracing this block: 6 weeks for the engine, 2 weeks for a game. Starting point: A basic CPU-only voxel tracer. End point: awesomeness. Posting one video per day.
Today's spotlight: 𝔼𝕣𝕚𝕜 ℂ𝕦𝕡𝕒𝕜's Water World.
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Real-time path traced specular reflections (filtered), running on a 1060. TAA has been restored.
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The paper titled "Accelerating Ray Tracing using Origin Offsets" by Tim Zoet and me has been accepted for WSCG'20. Link: .
Idea is to offset ray origins to prevent traversal of the dense accstruc near surfaces, in a traversal implementation agnostic way.
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TL;DR: Too hard to learn; many people stick with OpenGL. In the meantime, a colleague at my university asked if it would be safe to basically switch to path tracing altogether for year 2 courses next year, using the APIs to render 2 tris essentially...
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The article series on proper BVH construction (, ...) will be extended with:
7. Consolidating: ray tracing textured and shaded meshes.
8. OpenCL: GPU ray tracing with CPU-maintained BVHs.
After that, I hope to start a new series, on proper path tracing.
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Article
#2
in the series on Voxel Ray Tracing in C++ will arrive tomorrow around noon! In the meantime, the first one is available here:
Get the rendering template on Github:
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Utrecht University recently moved some servers, which broke my BVH tutorial series. Everything is back! The series covers absolute basics all the way to building TLAS/BLAS data for GPU in 10 articles. There's detailed code for each article as well.
Link:
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Our
@BuasGames
students explored modern ray tracing this block: 6 weeks for the engine, 2 for a game. Starting point: A basic CPU-only voxel tracer. End point: awesomeness!
Final one: ℤ𝕙𝕒𝕟𝕘𝕚𝕣's Physics Pong.
New: Voxel Ray Tracing in C++ series:
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Fixed the CPU-only octree/voxelworld renderer source package link:
Pretty complete and very fast engine. Landscape is procedural and can be edited in real-time.
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New on my blog: an overview page with (most of) the articles nicely organized per topic. Hopefully it's a bit easier to navigate than the main page of the blog. :)
Link:
Series:
Building a BVH
Probability Theory
Software Optimization
and: "Various".
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SVGF with motion vector estimation for speculars. In progress; TAA has been disabled, recursive reflections are non-existent, object edges flicker, but still, progress. :)
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Published a blog post on the internals of the voxel renderer, including notes on thread-safe two-level grid maintenance, false sharing and synchronizing CPU/GPU workloads with OpenCL:
Accompanying source code is now CC0 on Github:
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Just ran into the interesting paper on filtering for 1spp path traced input, by Koskela et al.:
Some impressive results.
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We asked our first year
#thisisigad
students to write a 2D ray tracer (in 6 weeks), and a small game to demonstrate it (in 2 weeks). Amazing results. :) This is Peter Vaneveld's game.
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Not sure if I reinvented the wheel, but: here's a small tool that converts an .obj file to .vox at any desired res (1..255). The tool supports textured models.
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Part 2 of the SIMD tutorial blog post is now available:
This one covers scalar flows, AoS versus SoA, and masking, applied to Moller-Trumbore triangle intersection.
First part is also still available of course. :)
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Decided to implement a not-too-hard paper to get over my coder's block, picked "Realtime Stochastic Lightcuts" by
@DaqiLin
&
@cem_yuksel
. Turned out to be not so simple but satisfying, via agglomerative builds, cost functions, 16-byte reads in CUDA and point to aabb distances.
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The blue noise scheme recently proposed by
@eric_heitz
has been added to the pt cores of Lighthouse 2: . Video shows 1spp quality using blue noise and the recently added Disney BRDF @ 1920x1080, 60fps without fraps.
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Some random pictures from assignment 2 ("BVH") of Advanced Graphics (Utrecht University). I didn't specifically ask for 'pretty pictures', but will do so for the final assignment. :)
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Dusted off an older OpenGL project and uploaded it to github:
This is a basic multi-pass OpenGL renderer with omni-directional lights, cubemap reflections, screen space ray traced reflections and a ton of other stuff. Rebuilds in 5 seconds.
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Just pushed a new version of Lighthouse 2: . This version adds filtering support (SVGF) and prepares for a proper Linux release by incorporating most of Marijn's changes (). Vid: 720p on a laptop 1060. No noise. :)
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Suddenly a Rust path tracer with convergence and a HDR skydome. Language is quickly getting less frustrating.
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Our
@BuasGames
year 1 students explored modern ray tracing this block: 6 weeks for the engine, 2 weeks for a game. Starting point: A basic CPU-only voxel tracer. End point: awesomeness. Posting one video per day.
Today's spotlight: 𝕃𝕖𝕠 𝕊𝕥𝕖𝕨𝕖𝕟's Eye of Sauron sim.
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Yes, I tried to write a pretty complete and state-of-the-art overview of bounding volume hierarchy construction and traversal on CPU and GPU, including TLAS/BLAS. Only thing missing is GPU-side construction, but I am not even sure you should do that in the first place. ;)
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Visited today. Looks like there is not a single question about graphics on the graphics forum:
It seems all about how to use APIs. How much of graphics programming is actual graphics programming these days?
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HPG'23 is done, and was great! Also: I obtained a physical Cornell box, prepared and signed by Andrew Garrard!
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Before the summer holiday Utrecht University students optimized my voxel engine. Behold: a SHMUP game running at up to 400fps. All world maintenance on the CPU, ray tracing on the GPU. Obviously you'll want vsync with that. ;)
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It's my birthday and one of my graphics students
@BuasGames
made me this. :)
Topic this block is voxel ray tracing, in case it wasn't obvious.
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Lighthouse 2 now directly renders PBRT materials / scenes using CUDA/Optix, thanks to the work of Marijn Suijten (). Now on Github: .
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"Lumen has been a year-long project at Breda University of Applied Sciences. As team of 6 programmers, we were tasked with making a real-time path tracer on RTX 3000 hardware."
Realtime path tracing with ReSTIR and filtering by a team of students:
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Lighthouse 2, 4spp, 60+ fps. At some point you can skip the filtering. :) Stills are clearly noisy, but in motion it's close to acceptable. HQ vid:
Lighthouse 2 project:
Github:
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TIL.
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Poor 1060 laptop running Lighthouse2 path tracer with Optix Prime / SVGF.
New demo now on ompf2:
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That is beautiful, thanks for sharing.
Still one of the most accessible explanations of the rendering equation out there, by
@levork
.
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