Redshift only works with older MacOS versions that support nVidia Web driver installation CUDA etc. Apple closed the door on nVidia driver installation citing ‘security’. Apple and nVidia have been embroiled in a long standing dispute, neither get on and the poor saps who continue to use Macs for professional work are caught in the middle of a corporate powerplay.
It has been said that Redshift will support native Metal compute later this year after the new Mac Pro is released. They may have every intention but I don’t believe a word coming from the Redshift developers regarding release time frames. There have been many promises made and everyone to my knowledge has never been kept.
There may well be a Metal compatible version of Redshift available later this year but, based on past experience, there’s every chance it’ll be a very undercooked feature incomplete Alpha build and it’ll be more like 6 months to a year later that it’ll enter perpetual beta.
More and more users are getting upset that long promised features like random walk SSS are seemingly months and months away. Redshift SSS is dreadful, it’s blotchy or slow and noisy depending on which mode you use, skin renders look like wax-works and random walk SSS is seen as the silver bullet to get acceptable skin renders finally. There are countless other features that have been spoken about at several nVidia presentations that have yet to materialise.
I did not renew our Redshift maintenance because of broken promises and since the Maxon acquisition almost zero communication of what’s coming when and how. The Redshift devs were always very open about plans before being Maxoned.
Say what you like about Autodesk, Arnold urinates from a great height on Redshift in terms of features and quality of image. If you’re a professional and you’ve got a renderfarm or use the cloud Arnold makes much more sense.