New features since the last video: - Exponential height fog (only regular fog in video). - Water turbidity (underwater fog) and transmittance (dim by depth). - Half-lambert and non-flat ambient lighting based on sun and sky colors. - Schlick's approximation for more realistic water reflection calculations. - Optimized render pipeline (fewer stalls) from 75 FPS to 125 FPS. - Lots of refactoring under the hood.