Re: vray dr vs. backburner
Tim,
i know its a pain to set up, but i had DR working fine on viz2005 and was very stable. I would suggest looking thro some of the forums such as chaosgroup for a detailed explanation of how to set it up, even set up Backburner and create your own vraydummy files.
Backburner is also very useful, but not as useful as DR on single images. Backburner is more suitable for animations and however you render, if your using GI and rendering across a farm you will need to precalc the irr map / light map to avoid frame flickering. if your just using a single machine you don't need to but i'd still suggest it as it should save you time.
Finally i generally use irr map for primary bounce and qmc for secondary bounces.
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