Tutorials

1. Exporting VRay light intensities in EXR metadata
2. Rebalancing light intensities in Nuke

Useful Websites

VRay:
1. Chaos Group Help
2. Chaos Group Forums
3. Best VRay settings
4. BigRoy VRay Maya command docs
5. Akin Bilgic - VRay Render Optimisation
6. Demystifying VRay's DMC Sampler
7. Critical VRay Settings (pdf)

Renderman:
1. Fundza
2. Renderman University
3. Renderman Documentation