Through this Gizmo you can create Z-Depth Pass using Point Position pass and camera information.
nDepthGen
Updated: 22 December 2019
Author: chetalvfx
Compatible Nuke versions: 10.5 or later
Compatibility:
The Gizmo is helpful when you forgot to generate Z-depth pass in 3D Application and if you have Point Position and Camera information available.
Even with this Gizmo you get good infomration of Z specifically on edges.
Hope this Gizmo will help you in your pipeline.
Thank You :)