Or for the fancy version, you can raytrace the terrain shadows! https://news.ycombinator.com/item?id=17065264 https://news.ycombinator.com/item?id=17065264 Th

Or for the fancy version, you can raytrace the terrain shadows! https://news.ycombinator.com/item?id=17065264 https://news.ycombinator.com/item?id=17065264 The linked post has some good comparisons with derivative-based shading, it does sorta work but you can see it comes up short in conveying actual 3D shape compared to the raytraced version.