Apparently this blog show wouldn’t be complete without a shot of my Elevator Shaft. I don’t want to say too much but silly idea came up and we wanted to include a shot of an Elevator! So the episode is taking a little longer to complete. Why am I always waiting on Elevators!!!?
This scene inside of Element 3D and found that using a world position pass helped to composite elements into the scene better. A Z-pass is great but with a camera movement the depth changes based on the camera distance. But a world position pass is almost like a texture that stays in place. So you can create depth information that stays parallel to a surface so you can composite smoke or other live action elements. Here is an older video with some information about the World Position feature inside Element 3D.
Notice how the world position pass highlights the back wall evenly behind the scaffolding. This could also be used as a mask for color correction or placing dust elements against the wall.
Source: Video Copilot