The new DAZ Studio Studio 4.20 is out of beta and it updates to “the latest version of iRay (2021.1.0)”. Meaning we get the volumetric depth-effects (i.e. lights shining through fogs, hazes, mists etc) that the iRay devs have been working on.
The iRay devs also noted on their tech blog… “dramatically decreased host/CPU texture memory usage” for this iRay version. Which many people doing CPU-only rendering and/or more-or-less real-time viewports on CPUs will welcome. Yes it is possible to run iRay on CPUs alone, if you have enough of them and a streamlined workstation. It’s a myth that it only runs on expensive NVIDIA graphics cards (GPUs).
4.20 is also said to have lots of bug and stability fixes. As with all shiny new software releases, it’s probably best to wait a few weeks before install, to see what problems the early adopters encounter.
Update: No, I can’t recommend it… as it can badly screw up the Viewport. There’s a major bug with the SHIFT + F11 fullscreen, with this current installer version.