The objective of this thesis is to investigate and implement a global illumination technique using surfels for realistic lighting in 3D environments. The solution will be based on the course presented by Halen et al. during SIGGRAPH 21. The algorithm will be implemented using WebGPU. The student should include several debugging views that demonstrate the internal functioning of the algorithm. For simplicity, the algorithm can be demonstrated on a simple scene using only spheres. In the theoretical part, the student will compare local and global illumination models and discuss their respective advantages and disadvantages. Finally, the student will evaluate the performance of the designed algorithm.