I’m not sure if Keyshot for Zbrush will allow you to render out an Alpha channel for later compositing or other render pass capabilities. I think the Keyshot Pro can do this but not sure if Keyshot HD/Zbrush does - if so I can’t seem to find it…
That’s a Pro feature as far as I’m aware. It doesn’t prevent you from setting up your own render passes manually, just takes more work.
If output is set to .png or .psd, you can save out alpha transparency in the output options.
That is something I’m missing too.
I really hope we will benefit at least of a zdepth pass one day.