Today, I have finally accomplished the (seemingly) impossible.
After a lot of trial and error, I finally figured out how to use LuxRender’s Hybrid renderer.
I had tried for a couple months without luck, but today I had a breakthrough.
(Turns out debug logs are more useful than I realized.)
The hybrid CPU + GPU rendering took only 20 minutes, and you can see the quality for yourself:
I’m very excited about all the possiblities of hybrid rendering and can’t wait until my next chance to use it!