Tutorial: ShadowCatcher (3/5: HDRI Only)

This part will show how to use ShadowCatcher when we have only HDRI map at our disposal, without any backplate.

Part 1: Overview: https://www.youtube.com/watch?v=9JDGmzZaMkE

Part 2: HDRI + backplate: https://www.youtube.com/watch?v=j3GI5QablJ0

Part 3: HDRI only: https://www.youtube.com/watch?v=OVXU28b9H9g

Part 4: Compositing setup: https://www.youtube.com/watch?v=4WL4UcbLLlw

Part 5: Illuminators: https://www.youtube.com/watch?v=VGZOOdTMg0E