I think the result of appleseed is good, but I am really unbearable of the slow speed for getting wonderful result(Of course this is related to my poor computer, but I think any cpu global illumination soft ware is slow, incluing pbrt, mitsuba or any other).
So I look for real-time path trace methods, and really find some cool methods to speed up path tracing rendering using GPU:
RTX or DXR, this is related to nvidia card or directx 12, and since appleseed is cross-platform, this is not a suitable methods.
OpenGL or OpenCL. These are good solutions for appleseed I think. They are cross-platform and powerful. I have seen some successful implementions using OpenGL and they are really fast compared to CPU. I think they use fragment shader to relasize the implementation. Besides, someone says using compute shader of OpenGL is better. Anyway, using opengl is a good solution.
So, do you plan to use GPU to sppedup the global illumation of appleseed? I think this is a perfect and attractive advantage for appleseed