Erik S. V. Jansson

I'm a passionate software engineer, with a burning desire to contribute in interesting and challenging projects which require computationally performant solutions. Here you'll find a vetted list of my papers, source code and blog posts in a variety of topics such as: computer graphics, AI, game development, system programming, machine learning, compression, cryptography, computer security, and loads more just for good measure!

I'm a Senior Graphics Programmer at Remedy Entertainment since 2019.

Most of my source code is distributed on GitHub under a MIT license. The Polygon Soup is the name of my blog, but there's nothing there yet. If you want to reach me, send an e-mail! Feel free to check out my CV.

Publications

Real-Time Hybrid Hair Rendering: we've developed a novel hybrid hair rendering pipeline for strand-based hair that uses a volumetric approximation as a scalable level-of-detail minification scheme. We show that it performs better than vanilla raster-based techniques.
Monte Carlo Raytracing from Scratch: describes all the party tricks needed to implement a monte carlo raytracer from scratch along with the photon mapping technique. Here is the project on GitHub.
Behaviour Tree Evolution by Genetic Programming: shows how the agents for a top-down arena shooter can learn novel behaviours. We've programmed behaviour trees, path finding (with A*) and the genetic programming algorithms from scratch. See the project code.
A C++ Concepts Primer: a short presentation on C++20's Concepts.
Real-Time Fluid Animation using 3-D Curl-Noise: we implemented Robert Bridson's Curl-Noise in OpenCL to simulate particles and used OpenGL interoperability for the rendering. See it at GitHub.
Selected Topics in Modeling and Animation: brief summary within some parts in the field, covers: the half-edge data structure, splines, mesh decimation and subdivision and fluids using implicit surfaces.
Investigating Meteorite Landings using Filtering and Brushing: tries to visualize the NASA Meteorite Landings dataset in our fancy d3 webapp (no node.js) using geovisualization, filtering and brushing.
Selected Topics in Machine Learning: another field “overview" for some techniques: decision trees, kernel methods, neural networks, linear/logistic regression, feature selection implemented in R scripts.
Test Coverage Data Analysis for Large-Scale Industrial Systems: my bachelor's thesis, where the viability of using test coverage in a large-scale system for code similarity analysis is determined. It was done at Ericsson® for their CI pipeline. I made the SCovAT there.
Flyweight Performance Effects in Real-Time Applications: written a long time ago; where the Flyweight Design Pattern is benchmarked.

Conferences

GPU-driven rendering with mesh shaders in Alan Wake 2: at Digital Dragons in Kraków, Poland (2024). The talk will be uploaded to this YouTube channel in due time. I also presented a extended talk at Xbox Dev Days in Paris, France, with console optimization tips!
Real-Time Hybrid Hair Rendering: at Eurographics Symposium on Rendering in Strasbourg, France (2019). Pre-print available for free.

Source Code

Real-Time Hybrid Hair Renderer in Vulkan: a hybrid hair renderer for strand-based hair that uses a fast volumetric approximation for level-of-detail. It accounts for light scattering, self-shadowing (+AO), and transparency in real-time, even with over 100,000 hair strands.
Vim Syntax Plugin for Vulkan GLSL: extended tikhomirov's plugin; support for the new GL_KHR_vulkan_glsl and GLSL 4.6 keywords.
Real-Time Ocean Simulation with Gerstner Waves: summarizes the nuts-and-bolts needed to animate deep ocean water efficiently by using vanilla Gerstner Waves and OpenGL's tessellation shaders. The shaders are provided under a MIT license, and are decoupled.
The glTF Sample Viewer: when I worked at UX3D we redesigned the default glTF WebGL renderer for the Khronos® Group to make it fully standards-compliant and extensible for future extensions. We added support for the PBR Specular-Glossiness KHR extension.
glTF Extensions for Subsurface Scattering: implemented and tested the draft's reference GLSL shader, based on Frostbite's technique.
Set Coverage Analysis Tool: tool for applying set operations on test coverage data, for finding the Hamming distance and the Jaccard similarity between tests. See the thesis defense for usage examples.
Not Quite Sokoban: clone of the popular Sokoban puzzle, but with some new interesting 3-D twists. See my report and presentation.
CHIP-8 Emulator/Interpreter: software variant of the CHIP-8, in modern C++11/14. It features all of the standard instruction sets, and has a built-in debugger. The graphical front-end uses SDL2.
Sane, Lightweight and Aesthetic Vim: changes to Vim are sacrilege, my configuration keep this to a minimum, but is pretty to look at.
Adaptive Arithmetic Coding and Lempel-Ziv-Welch: developed the Markov model entropy.py measuring scripts, along with the C++ codec libraries: liblzw and libaac from scratch. See also my report.
Sniglen 2-D: an old Worms-esque game written in C++11 / SFML.

Game Credits

Alan Wake 2 (2023): development of landscape technology and also improvements to GI and lighting. New GPU-driven rendering with fast meshlet occlusion culling on Playstation 5 and Xbox Series S | X.
CrossFire X (2022): improved the underlying lighting technology in the Northlight® engine. Among other things, improvements to GI. I also did performance optimization for Xbox One and Series S | X.
CONTROL (2021): after joining Remedy I helped in shipping both AWE and Foundation DLCs as a Graphics Programmer. I also did some of the Playstation 5 and Xbox Series S | X perf. optimizations.