James Shaw has posted THIS article that lays out a ton of useful Vray parameters. It is for 3D Studio Max, but all the concepts apply for VrayforC4D. “Recently Ryan Lintott and I went to a VRay training seminar by the man himself Vladimir Koylazo (one of the makers of VRay) who went through a number of facets of VRay including a step by step way of breaking down your render settings into logical steps to get the best combination of quality and speed.”