Enhancement of the Ambient Occlusion Node in the Cycles Renderer

User Question:‌ The Ambient Occlusion Node can be used to achieve realistic AO effects when adjusting materials. I often use it as a mask, such as for rust effects. However, the current node generates AO for all models in the scene that it interacts with. It would be better if we could specify which models produce the AO effect.

For example, if I want to add dirt where the rocks on a mountain meet the mountain itself to blend them better, I can use the Ambient Occlusion Node as a mask to add dirt to the rock material. However, the trees and grass on the mountain also generate AO on the rocks, which produces incorrect results. If I could specify that only the mountain model or the collection containing the mountain model generates the AO effect, the result would be correct. I also think this would improve calculation speed.

A long time ago, I used a software called Clarisse, and its AO node could specify which models to generate AO with. I hope Blender can implement this feature.