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.

Viz Engine

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:

Unreal Configuration

AUX1

Lens Distortion needs to be enabled working and enabled on AUX1.

AUX2

If you use depth sharing, Lens Distortion needs to be Disabled and Overscan Enabled on AUX2

Example