Some different comp form different pictures

Utilities examples

Subtractive method

1. Unpremult All Channels
2. Subtract desired AOV
3. Grade Individually
4. Add back together
5. Remove channels and Premult

Grade the passes (Put the machinery into the scene）

1.Modify the mechanical grade node

2.Overlay colors

3.Modify mechanical AO（Multiply shadows over BG before comp over cg asset

4.Repositioning（Transform+Crop)

5.Combine mechanic and shadows