I thank to the Radeon Prorender developer, finally in Radeon Prorender version 3.1.0, I can render transparently as easily as in Cycle Render.
Besides that, the preview in Blender compositing is also very fast in the preview process. spectacular!!
But there is a bug I found (see horizontal white line), or maybe it's just a wrong setup. but.. Iam quite happy with this progress development.
if the horizontal white line is a bug.. please fix it.. if not.. let me know the correct settings.
Thanks thanks thanks!!!!!
I Used Blender 2.9.2
