AO baking nessessary?? also, still need node setup help

Hiya!

I’ve seen people texturing models and using a AO texture. I’m probably dense but is there any need for a AO pass if cycles will do that anyway when it renders? I’m curious!

Also, sorry to beat the horse but…

I still need a node setup for texture painting chipped paint/rust/grunge ect.

ie.

base layer metal (shiny)
layer above would be primer
layer above that is paint (with bump)
Then a grunge layer
Rust

I have no idea how to lay this out in blender nodes. Any help would be appreciated.

Thanks peoples.

For your node setup, watch Blender Guru’s intro to realistic materials in cycles.