"at all". Well....let me append to that; if one of your passes is reflective or especially a volumetric pass, then yes, the render times will long(er) as usual, but if you would have done a one-shot render with those elements in there anyway, it's not going to really add to the TOTAL time spent rendering. The obvious advatage is being able to manipulate those seperate passes later. If a client says, "I LOVE it...can we not have as much smoke? Then its the difference between replying with "Uh...I need another 3 days to render.", OR replying, "Sure...(mouse click)...how's that?" AS

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