ImageEngine/cortex — pull request #243 by goddardl (2014-03-19 19:10:33+00:00)
Title: Added support in IECoreNuke::DeepImageReader for ZBack channels

The IECoreNuke::DeepImageReader previously ignored any ZBack channel and created on from the previous samples Z value.

This pull request fixes that issue and allows the node to use a ZBack channel if one is available.