ZDepth pass of Antioxidants animation

This ZDepth pass looks so chool, that it will be a crime to bury it under the tons of other layers in composition without showing it to you :)
Full project: www.behance.net/gallery/66452...

[@yuriyg]

yes, it's true. how did you out this pass? Vray, or Redshift ? I'm use Redshift for my render, it's the best for me ))