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Information about the supported environment variables is available here. This can be useful for custom 3Delight Studio Pro installations, but is not generally recommended as it can easily lead to a non-working 3Delight installation and is harder to debug.
System Requirement
Maya versions : 2016*, 2016.5, 2017, 2018
Operating systems : Windows 64-bit, Linux 64-bit, macOS 64-bit
*the oldest Maya version supported on macOS is 2016.5.