/3/ - 3DCG

>>480332
You can edit the way light reacts to normals. This picture of Michael from GTA 5 is an ok example. The hair planes run all along his head at different angles but stilll retain the same normal lighting that his bald head would. It makes creating believable trees and shrubbery much easier too.

Like if you have a batch of grass. The normals are going to be going in every direction. Lighting just isng going to look good with one sun light pointing down at the grass. With normal editing, you can force the grass to take in light from right above it and shade it to look less like a batch of planes and more like one physical patch of grass.