
Recent Posts
 Dimensionality reduction for image and texture set compression May 21, 2020
 “Optimizing” blue noise dithering – backpropagation through Fourier transform and sorting April 26, 2020
 Bilinear texture filtering – artifacts, alternatives, and frequency domain analysis April 14, 2020
 Using JAX, numpy, and optimization techniques to improve separable image filters March 15, 2020
 Separate your filters! Separability, SVD and lowrank approximation of 2D image processing filters February 3, 2020
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Categories
Tag Archives: programming
Using JAX, numpy, and optimization techniques to improve separable image filters
In today’s blog post I will look at two topics: how to use JAX (“hyped” new Python ML / autodifferentiation library), and a basic application that is followup to my previous blog post on using SVD for lowrank approximations and … Continue reading
Posted in Code / Graphics
Tagged bokeh, colab, github, graphics programming, image processing, jax, maths, numpy, postprocessing, programming, python
5 Comments
Analyze your own activity data using Google Takeout – music listening stats example
The goal of this post is to show how to download our own data stored and used by internet services to generate personalized stats / charts like below and will show stepbystep how to do it using colab, Python, pandas, … Continue reading
Posted in Code / Graphics
Tagged colab, data, numpy, programming, python, statistics, visualization
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How (not) to test graphics algorithms
Intro Siggraph 2019 is sadly over, but as always I came back super inspired and grateful for meeting many friends. Conferences are mostly not about seeing the presentations – but about all the interesting and inspiring discussions, and one of … Continue reading
Posted in Code / Graphics
Tagged code design, code style, graphics, graphics programming, programming, siggraph, testing, tests
2 Comments
Cull that cone! Improved cone/spotlight visibility tests for tiled and clustered lighting
In this blog post, I will present some common spotlight culling techniques and propose one small improvement that is able to correct results of cheap, tiled / clustered culling on the CPU/GPU with almost negligible ALU cost. If you know … Continue reading
Posted in Code / Graphics
Tagged cone, culling, geometry, graphics, ideas, lighting, mathematica, mathematics, occlussion, programming, sphere, spot, visibility
9 Comments
Small float formats – R11G11B10F precision
While this post is not yet dithering related, it is in a way a part of my series about dithering. You can check index of all parts here or check the previous part. I will talk here about use of … Continue reading
Posted in Code / Graphics
Tagged float, floating point, floats, graphics, mathematica, mathematics, noise, programming, quantization, rendering
6 Comments
Dithering part three – real world 2D quantization dithering
In previous two parts of this blog post miniseries I described basic uses mentioned blue noise definition, referenced/presented 2 techniques of generating blue noise and one of many general purpose highfrequency lowdiscrepancy sampling sequences. In this post, we will look … Continue reading
Posted in Code / Graphics
Tagged bayer, blue noise, dithering, fourier, graphics, graphics programming, interleaved gradient noise, mathematica, mathematics, maths, noise, programming, sampling
6 Comments
Dithering part two – golden ratio sequence, blue noise and highpassandremap
In previous part of the miniseries I covered dithering definition and how dithering changes error characteristics of simple 1D quantization and functions. In this part I will try to look at what blue noise is, but first wanted to have a … Continue reading
Posted in Code / Graphics
Tagged blue noise, dithering, golden ratio, graphics, graphics programming, low discrepancy, noise, programming
10 Comments
Dithering part one – simple quantization
Introduction First part of this miniseries will focus on more theoretical side of dithering some history and applying it for 1D signals and to quantization. I will try to do some frequency analysis of errors of quantization and how dithering … Continue reading
Posted in Code / Graphics
Tagged dithering, mathematica, mathematics, noise, programming, sampling
2 Comments
Dithering in games – mini series
This an opening post of mini blog post series about various uses of dithering for quantization and sampling in video games. It is something most of us use intuitively in every day work, so wanted to write down some of … Continue reading
Posted in Code / Graphics
Tagged blue noise, dithering, graphics, graphics programming, mathematica, noise, programming, sampling
6 Comments
Short names are short
Intro This blog post is a counterargument and response to a post by Bob Nystrom that got very popular few months ago and was often reshared. I disagree so much that I thought it’s worth sharing my opinion on this topic. … Continue reading
Posted in Code / Graphics
Tagged code design, code style, naming, plugins, programming, readability
1 Comment
Technical debt… or technical weight?
Introduction Whole idea for this post came from a very inspiring conversation with my friends and excolleagues from Ubisoft that we had over a dinner few months ago. We started to talk about some sophisticated code algorithm – an algorithm … Continue reading
Posted in Code / Graphics
Tagged algorithms, architecture, code design, programming, psychology
2 Comments
Anamorphic lens flares and visual effects
Introduction There are no visual effects that are more controversial than various lens and sensor effects. Lens flares, bloom, dirty lens, chromatic aberrations… All of those have their lovers and haters. Couple years ago many games used cheap pseudo HDR effect … Continue reading
Posted in Code / Graphics
Tagged algorithms, anamorphic, bokeh, C#, cinematography, depth of field, film, flares, graphics, graphics programming, history, lens, movies, photography, postprocessing, programming
16 Comments
Designing a nextgeneration posteffects pipeline
Hey, it’s been a while since my last post. Today I will focus on topic of posteffects. Specifically, I wanted to talk about nextgen post process pipeline and redesign I worked on while being a part of Far Cry 4 rendering team. … Continue reading
Posted in Code / Graphics
Tagged 1080p, algorithms, far cry 4, graphics, graphics programming, photography, PlayStation 4, postprocessing, programming, Xbox One
6 Comments
CSharpRenderer Framework update
In couple days I’m saying goodbye to my big desktop PC for several next weeks (relocation), so time to commit some stuff to my CSharpRenderer GitHub repository that was waiting for it for way too long. 🙂 Startup time optimizations … Continue reading
Posted in Code / Graphics
Tagged .NET, C#, framework, graphics, graphics programming, postprocessing, programming, tools
15 Comments
Review: “Multithreading for Visual Effects”, CRC Press 2014
Today I wrote a short review about a book I bought and read recently – “Multithreading for Visual Effects” published by CRC Press 2014 and including articles by Martin Watt, Erwin Coumans, George ElKoura, Ronald Henderson, Manuel Kraemer, Jeff Lait, James Reinders. … Continue reading
Updated Poissonlike generator with GUI and more
Just a super short note: I updated my simple renderingoriented Poissonlike pattern generator with: Very simple GUI made in PyQt to make experimenting easier. Option to do rotating disk (with minimizing rotated point distance) for things like Poisson bokeh / … Continue reading
Posted in Code / Graphics
Tagged algorithms, Anaconda, antialiasing, graphics programming, mathematica, poisson, programming, pyqt, python, stochastic
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Poisson disk/square sampling generator for rendering
I have just submitted onto GitHub small new script – Poissonlike distribution sampling generator suited for various typical rendering scenarios. Unlike other small generators available it supports many sampling patterns – disk, disk with a central tap, square, repeating grid. It … Continue reading
Posted in Code / Graphics
Tagged algorithms, Anaconda, programming, python, stochastic, supersampling, temporal, tools, winpython
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Runtime editorconsole connection in The Witcher 2
During Digital Dragons and tons of inspiring talks and discussions I’ve been asked by one Polish game developer (he and his team are doing quite cool earlyaccess Steam economy/strategy game about space exploration programmes that you can check out here) to … Continue reading
Posted in Code / Graphics
Tagged debugging, editor, pipeline, programming, the witcher 2: assassins of kings, tools, witcher 2
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Digital Dragons 2014 slides
This Friday I gave a talk on Digital Dragons 2014. It was a presentation with tons of new, unpublished content and details about our: Global Illumination solution – full description of baking process, storing data in 2D textures and runtime application Temporal … Continue reading
Posted in Code / Graphics
Tagged assassin's creed, graphics, graphics programming, PlayStation 4, postprocessing, programming, Xbox One
2 Comments
C#/.NET graphics framework
In my previous post about bokeh I promised that I will write a bit more about my simple C# graphics framework I use at home for prototyping various DX11 graphics effects. You can download its early version with demonstration of bokeh … Continue reading
Posted in Code / Graphics
Tagged .NET, C#, framework, graphics, graphics programming, programming, shaders
13 Comments