Devin Johnston Posted January 8, 2008 Share Posted January 8, 2008 The default is set to 400MB, do most of you leave it set to this or do you change it? I've found that changing it to 800MB dramatically decreases the time it takes to go through the pre pass stage if you have a heavy poly scene. Link to comment Share on other sites More sharing options...
rivoli Posted January 8, 2008 Share Posted January 8, 2008 in every scene with instances, proxies, displacement or fur I always set to higher values than the default one. 800mb it's fine most of the times, but I guess it depends on the particular scene and how much ram the machine has. Link to comment Share on other sites More sharing options...
Devin Johnston Posted January 8, 2008 Author Share Posted January 8, 2008 My machine had 4 Gigs so I could set it higher, the scene I'm working on now has hundreds of proxy trees and cars in it, my poly count is almost 13 million but I'm using less than 2 Gigs of ram. If I leave DM at 400 mb the pre pass stage takes about an hour, if I crank it up to 800mb it takes about 5 minutes. I'm not a Vray expert so I don't understand what DM is doing that affects the process so dramatically. Link to comment Share on other sites More sharing options...
rivoli Posted January 8, 2008 Share Posted January 8, 2008 what vray does dynamically with instances or proxies, is loading and freeing ram on the fly when it needs the instanced geometry (instead of loading the whole scene in one big chunk). if the limit it's set too low, one thread might have to wait for another one to finish before it can access memory, and this can slow things down. Link to comment Share on other sites More sharing options...
Devin Johnston Posted January 8, 2008 Author Share Posted January 8, 2008 Thanks for that info, is there any other little trick to speed up the light cache process? Link to comment Share on other sites More sharing options...
rivoli Posted January 8, 2008 Share Posted January 8, 2008 usually I tend to exclude from gi anything that doesn't really need it (generate, receive or both), in some cases it really makes a difference, especially with light cache. you may try with your cars or trees (or maybe just a group of trees if they're not in the foreground for example), and see if it makes it faster (and looking as good). other than that I usually don't go for high light cache settings for exteriors, not as high as I would go for interiors at least. some tweaks there might cut rendertimes as well. and light cache doesn't really like non vray materials, it is always faster if you avoid them. Link to comment Share on other sites More sharing options...
Devin Johnston Posted January 8, 2008 Author Share Posted January 8, 2008 thanks rivoli Link to comment Share on other sites More sharing options...
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