Author Archives: bartwronski

Dithering part two – golden ratio sequence, blue noise and highpass-and-remap

Posted on October 30, 2016 by bartwronski

In previous part of the mini-series 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 →

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Dithering part one – simple quantization

Posted on October 30, 2016 by bartwronski

Introduction First part of this mini-series 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 →

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Dithering in games – mini series

Posted on October 30, 2016 by bartwronski

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 →

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Short names are short

Posted on September 14, 2016 by bartwronski

Intro This blog post is a counter-argument and response to a post by Bob Nystrom that got very popular few months ago and was often re-shared. I disagree so much that I thought it’s worth sharing my opinion on this topic. … Continue reading →

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Image dynamic range

Posted on September 1, 2016 by bartwronski

Intro This post is a second part of my mini-series about dynamic range in games. In this part I would like to talk a bit about dynamic range, contrast/gamma and viewing conditions. You can find the other post in the series here and … Continue reading →

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Localized tonemapping – is global exposure and global tonemapping operator enough for video games?

Posted on August 29, 2016 by bartwronski

In this blog post, I wanted to address something that I was thinking about for many years – since starting working on rendering in video games and with HDR workflows and having experience with various photographic techniques. For the title … Continue reading →

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Technical debt… or technical weight/burden?

Posted on June 26, 2016 by bartwronski

Introduction The whole idea for this post came from a very inspiring conversation with my friends and ex-colleagues from Ubisoft that we had over a dinner a few months ago. We started to talk about a sophisticated code algorithm – … Continue reading →

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White balance and physically based rendering pipelines. Part 2 – practical problems.

Posted on October 14, 2015 by bartwronski

White balance and lighting conditions After this long introduction (be sure to check part one if you haven’t!), we can finally go to the problem that started whole idea for this post (as in my opinion it is unsolved problem – … Continue reading →

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White balance and physically based rendering pipelines. Part 1 – introduction.

Posted on October 14, 2015 by bartwronski

This is part one of the whole article. Part two is here. In this two posts (started as one, but I had to split it to make it more… digestible) I’m going to talk a bit about the white balance. First … Continue reading →

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Fixing screen-space deferred decals

Posted on March 12, 2015 by bartwronski

Screen-space deferred decals are a very popular technique. There were so many presentations and blog posts about it that I will just list couple of them (just a first google search results page to be honest…) in no particular order: … Continue reading →

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Anamorphic lens flares and visual effects

Posted on March 9, 2015 by bartwronski

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 →

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Processing scanned/DSLR photos of film negatives in Lightroom

Posted on February 19, 2015 by bartwronski

The topic I wanted to cover in this post is non-destructive workflow for “developing” photographed or scanned negatives – in this case B&W film. Why even bother about film? Because I still love analog photos as a hobby. 🙂 I wrote … Continue reading →

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Designing a next-generation post-effects pipeline

Posted on December 9, 2014 by bartwronski

Hey, it’s been a while since my last post. Today I will focus on topic of post-effects. Specifically, I wanted to talk about next-gen post process pipeline and redesign I worked on while being a part of Far Cry 4 rendering team. … Continue reading →

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CSharpRenderer Framework update

Posted on October 18, 2014 by bartwronski

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 →

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Review: “Multithreading for Visual Effects”, CRC Press 2014

Posted on September 21, 2014 by bartwronski

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 →

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Python as scientific toolbox – 8 months later

Posted on September 16, 2014 by bartwronski

I started this blog with a simple post about my attempts to find free Mathematica replacement tool for general scientific computing with focus on graphics. At that time I recommended scientific Python and WinPython environment. Many months have passed, I … Continue reading →

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New debugging options in CSharpRenderer framework

Posted on September 14, 2014 by bartwronski

Hi, minor update to my C#/.NET graphics rendering framework / playground got just submitted to GitHub. I implemented following new features: Surface debugging snapshots One of commentators asked me how to easily display for debug SSAO buffer – I had no easy … Continue reading →

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Updated Poisson-like generator with GUI and more

Posted on September 5, 2014 by bartwronski

Just a super short note: I updated my simple rendering-oriented Poisson-like 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 →

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Major C#/.NET graphics framework update + volumetric fog code!

Posted on August 20, 2014 by bartwronski

As I already promised too many times, here comes major CSharpRenderer framework update! As always, all code available on GitHub. Note that the goal is still the same – not to write most beautiful or fast code, but to provide a … Continue reading →

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Siggraph 2014 talk slides are up!

Posted on August 11, 2014 by bartwronski

As promised during my talk, I have just added Siggraph 2014 Advances in the Real-Time rendering slides, check them out at my Publications page. Some extra future ideas I didn’t manage to cover in time are in bonus slides section, … Continue reading →

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