Hey! guys
I have a quesiton
can only single mesh use piepline?
or cancel pipeline for specific mesh?
thank u!
In general nope as they are full screen processes 
but it depends what you use in the pipeline and which pipeline ?
You can render the meshes you want to apply the post-processing/pipelines to a separate renderTarget and combine with the scene? Multiple cameras and post-processing | Babylon.js Playground (babylonjs.com)
This wont be simple depending of the kind of pipeline as you might break the depth information 
Oooh good point