Border rendering (Control - B) draw box.... press Final Render is working perfectly in the current RPR v2.0.52.
However, could this be extended so that it also works in the viewport render please?
I don't know if it's related but could the "Render Region" checkbox in Camera Settings to do the same thing... only render what is inside the red dotted lines in camera view and exclude everything else in the scene? The viewport should speed up tremendously then when checking the camera view.
Many thanks
Gelert
