A. Solid object layering using depth, and blue in the stencil

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A. Solid object layering using depth, and blue in the stencil

In these examples, if we were to composite multiple real-time feeds instead of with playback media, then a stencil would be required for each real-time feed. The illustrations here are deliberately flat and simple for clarity, but they are followed by a real-life worked example.

Playback: a street scene

Image sequence RGB layer

Image sequence depth layer

 

PB-RGB
PB-depth-8bit-grey

 

Real-time asset: an opaque kite

Video feed RGB layer

Video feed depth layer

Video feed stencil layer
(uses blue for alpha)

RT-RGB
RT-depth-8bit-grey
RT-B-stencil

Output: in the composited scene, the kite flies between tree and houses

Compares depth:
which pixels are in front?

applies stencil (blue for alpha)

composites playback and real-time assets for output

PB-RT-depth
RT-B-stencil
ORGB-B-stencil