Explore four powerful lighting techniques for environments in Unity through this 29-minute tutorial set in the famous Sponza Atrium. Learn to create stunning lighting from scratch using a combination of baked and real-time methods. Discover how to implement the GPU Lightmapper, the new Probe Volume system, ray tracing, and path tracing. Follow along as the instructor guides you through setting up an HDRI sky, configuring direct lighting and shadowing, working with lightmaps and reflection probes, adjusting camera exposure, and utilizing light probes. Compare the effectiveness of lightmaps versus probe volumes, and delve into advanced techniques such as ray-traced reflections and global illumination. Conclude with a comprehensive summary and comparison of the various lighting methods demonstrated throughout the tutorial.