I'm looking to create some pseudo-"flat shaded" foliage, for lack of a better term. Basically I want all the planes that make up the foliage to have the same lighting so they blend together more.
The lighting of each plane is pretty different and therefore you can easily spot each plane, especially where they meet.
Here's another pic from The Witness, I think this was from their dev blog, the foliage looks very cohesive and the shading is very even across the whole thing.
I have read in a few places that one thing to help get more even shading on foliage is to edit the vertex normals so they are more rounded out. I tried using the "Normal Edit" modifier with no success. A lot of the foliage gets much darker and some places look much worse.
I found 2 addons that are supposed to help perform this process, I couldn't notice any difference when trying to use either of them. They both seemed to be years old and I'm not sure if they work with Cycles or work with the latest versions of Blender at all.