Brigade2 is a path tracing engine (running on GPU), wich is downloadable here: Brigade-Aruna or directly here: Brigade2. Later, Aruna2 will be available, wich will be better (it will run also on GPU).
Questions:
Is it possible to implement these engines into Unity?
Do I have to use shader language?
For a professional programmer, how much hours (so how big work) would it take?
Thanks, and Happy New Year!