Parameter to scale FG resolution!
For final renders i usually use half resolution FG. A parameter to set FG to 1/2 - 1/4 of the render resolution could be really usefull
we do it in a different way as what Zap explained. so close this.
indeed i know it's so.. but the best mental ray users on treddi.com suggest to use this method for final renders!
Dagon has also written some mental ray books
Zap Andersson commented
But that's exactly what "density" setting is. Lowering the density yeilds lower amount of FG points created, and is essentially similar to lowering the resolution during FG rendering. I.e. there is no benefit to lowering the resolution that you can't get also by lowering density.