For instance we have a grass patch placed all over an area, and we’d want to apply some sort of color/luminance variation on them. Not per grass or patch but for example the way we make variation into landscape surface using a macro texture. We can change intensity, scale etc. of the applied variation easily.
To explain what I mean more simpler:
Grass without variation
Grass with a cloud texture overlayd on top of the screenshot
Can we do this to painted foliage via the material/shader ? probably based on world space or something?