Clean render (Watch in HD)
Compositing test (Watch in HD)
Compositing with colour correction test (Watch in HD)
In the short motion / render tests above a few things were solved regarding viewport feedback, rendering, and memory usage in Mental Ray:
1) Mental Ray needs extra memory allocation to render / batch render.
2) Models should not be smoothed (smooth preview) in the viewport to improve feedback and loading.
3) Smoothing for rendering should be implemented using an 'approximation node' instead of smooth preview (to help with viewport manipulation)