Hello! My name is Julius Häger and I’m a Swedish graphics programmer.

I’m the current maintainer of OpenTK, a platform abstraction layer and OpenGL and Vulkan bindings for C#, and this is my work.

OpenTK maintainer

OpenTK provides OpenGL and Vulkan bindings and window creation and management for C#, and has over 6.3 million downloads on Nuget.

I’ve been maintainer for OpenTK since November 2020. During that time we’ve worked hard on our new OpenGL bindings generator, Vulkan bindings generator, and platform abstraction layer targeting Win32, Linux, and macos.

Master’s thesis

I’m currently working on my master’s thesis in spectral upsamling with fluorescense. Here is a little sneak-peek of my work.

Fluorescent crystal.

Two New Methods for Real-Time Ptex

In 2022 me and Hugo Dettner presented two new methods for efficiently rendering and filtering ptex on the GPU in real-time as part of our Batchelor’s thesis. One of our presented methods outperformed previous work while having quality matching previous state of the art.

Volumetric fog and clustered forward rendering

Volumetric fog implemented using frustum aligned volume texture and clustered forward rendering implemented for my project in a course about advanced graphics.

Area lights using Linearly Transformed Cosines

I implemented this as my project for the course DH2323. I had previously seen the paper for Linearly Transformed Cosines and had been interested in implementing it and this was a perfect oppurtunity to do so.

Interactive GPU path tracer

Path traced Cornell box.

I made a small interactive GPU path tracer for the course DH2323 at KTH. It’s written in C# using OpenTK, and has BVH acceleration.

Stanford bunny containd within lots of BVH boxes.

Game engine using OpenTK/C#

A “from scratch” game engine written with OpenTK. It features a PBR render pipeline, cascaded shadow maps, frustum culling, and integrated physics using BepuPhysics2. The engine also contains nice to have features such as live shader reloading.

sponza

Video showing transform gizmo and undo functionality.

Video showing live shader reloading.

Video showing frustum culling.

Metro vision

Metro Vision start screen

Metro vision was made during the 2020 GMTK Game Jam where I and a team of 8 other people made a innovative puzzler where your line of sight determines what controls/actions are available at your displosal. We made the game in Unity, and I was responsible for implementing the line-of-slight gameplay features and graphics.

Metro Vison gameplay screenshot showing that some controls are not in sight and as such not possible actions to take.

Candela

A small charming game about a candle finding it’s place. Make in 48 hours for the 2017 GMTK Game Jam in Unity with a team of 3 people. In this jam I experimented a lot with Cinemachine dollys and tracking.

Gameplay screenshot of candela.

Block buster

Block Buster was created in 48h during the 2019 Global Game Jam in Unity with a team of 9 people. On this project I worked on the random generation of cities, day and night cycle (glowing windows at nighttime), and hooking up an adaptive soundtrack.