How to segment mesh and cloud at the same time?

[arc1112]

Hi, I have a outcrop with clouds, I was trying to segment the cloud with the image(the mesh?) at the same time, the result was shown below. I was wondering how can I segment them together?

[daniel]

You should select both the mesh and the cloud. If the cloud is the mesh vertices then you'll need to clone the vertices first (otherwise CC will refuse to segment it).