Cavity wall made of double walls and a hollow space exists among them. A wall that is built up with two leaves or skins having a space or cavity among them is titled as a cavity wall.
Source: Cavity Wall Construction | Advantages & Disadvantages of Cavity Wall
Revit Live 2.0 helps you bring more data into real-time experiences with simplified apps, faster processing & full interoperability with 3dsMax Interactive
Source: What’s new in Revit Live 2.0 for immersive architectural visualizations – Revit Official Blog