The Multi-Layer External VS sequence is an enhanced Render Sequence that makes it possible to combine an Unreal Virtual Set with Viz Engine Graphics, a keyed input and AR Graphics on top. All from a single scene with lens distortion.

Scene Configuration

The Render Sequence needs to be set to Multi-Layer External VS:

The AUX channel containing the Unreal Engine Virtual Set needs to be put in the scenes Background slot, the keyed input in the Foreground slot:

Scene Tree Configuration

All elements need to have a Key for compositing to work properly. To be able to separate the rendering and get proper transparencies back when doing the compositing, the Key plug-in's Render Mode needs to be set to Blend (Premultiplied Alpha):

To be able to decide if the Graphics are rendered between the Unreal Virtual Set and the Talent or in front of the Talent, the Layer plug-in needs to be used.

Elements rendered in between need to have Main checked:

Elements rendered on top need to have the Overlay checked:

Example