Ambient Occlusion Demystified: A Beginner’s Tutorial
Ashutosh Jha
Ambient occlusion is most often calculated by casting rays in every direction from the surface. Rays that reach the background or “sky” increase the brightness of the surface, whereas a ray that hits any other object contributes no illumination. As a result, points surrounded by a large amount of geometry are rendered dark, whereas points with little geometry on the visible hemisphere appear light. More