Wow! This is beautiful and fast. You should be proud of yourself. There is another project (https://shadowmap.org https://shadowmap.org) that casts shadows in

Wow! This is beautiful and fast. You should be proud of yourself. There is another project (https://shadowmap.org https://shadowmap.org) that casts shadows in 3D. You might want to reach out to them. For me, I use ray-tracing per pixel because I want more control/information on a per-pixel basis. For example, when will the sun hit the particular location.