Clean up
The backplate had a few tracking markers that I had to clean up. I decided to use line-up geometry from Maya, so I imported it into Nuke. In Nuke I framehold frame and did the cleanup using roto paint node. Additionally, I created a roto patch around it. Then I projected the patch onto the line-up geometry. The result was that the patch covered the tracking marker. In this way, I cleaned up all tracking markers.
There is a lamp in the shot. I would have to make a roto around the lamp. However, I have decided to clean up the lamp and save time. I used the same technique as with the tracking markers.
Roto
Luckily I didn’t have to do much roto. I had a geometry of the walls so I used it as a hold out during rendering. The only roto I did was around area on the left side where is a rope and some bricks.
Compositing
I did a CG rebuild of the render. I color corrected and adjusted each layer. Additionally, I used crypto matte to isolate and modify specific engine parts. I matched black and white levels using grade node. I did add a bit of glow. I merged shadow pass that I color corrected. Finally, I applied distortion and film grain.