What is the difference between static and dynamic geom?

[sk_fly]

I am using the new internal version of VRay and trying to figure out what the EXACT difference is between static and dynamic default geometry. I have done many tests and I belive it is similar to a bitmap paging file. I know that certain scenes with lots of geometry will crash with static checks as the default and will render with dynamic. Also I can limit my ram usage will the dynamic memory limit. What I am trying to test right now is what kind, if any, performance hit in render time is taken by using dynamic geometry. I know if you use bitmap paging the renders take longer the more you have to page. Any exact explanation of this function will help greatly! I'm still testing, but more knowledge is always better.

[sk_fly]

Okay, I have been doing a bunch of render tests and have some results for anyone else who is interested in this issue. Though if anyone know techincally what the difference is I'd still like to know. I'm working on a complex outdoor scene, 1.5 milion poly's, lots of grass, trees, etc, displacement, no GI and for the sake of render test speed, motion blur is tuned off and my sampling is fixed at 1. I don't know if these parameter would affect the time vs. memory ratio I am getting. I am rendering at 960 by 540 and have 2 gigs or ram. Betwen each rendering I am running a FreeSceneBitmap() and GC(), garbage collect, to free the memory to be able to make acurate comparisions.

With static geom the render time is 3:05 mins and its taking 1.49 gigs of ram.
With dynamic on and the limit set at 700 mb it is taking 4:16 mins and 1.66 gigs of ram.
600 mb limit, 4:17 mins, 1.66 gigs
500 mb limit, 4:15 mins, 1.66 gigs
400 mb limit, 4:13 mins, 1.65 gigs
300 mb limit, 4:19 mins, 1.65 gigs
200 mb limit, 4:38 mins, 1.56 gigs
150 mb limit, 5:51 mins, 1.51 gigs
100 mb limit, I killed the render after 40 mins, 2 bucket (at 64*64) finished, when I killed it the 3rd bucket came back 1/2 finished and the fourth bucket came back 3/4 finished, the memory was only at 1.3 gigs, but since the memory keeps increases as the image renders I don't know what the final total would have been.

Anyone else who has done any other tests please post your results, maybe there are some options I am missing, but it seems that static actually takes less memory than all my tests, execpt the 100mb limit that never finished and is faster.

Also my scene just loaded in Max takes .56 gigs of ram and I'm sure alot of the memory usage is due to the huge amount and siaze of the textures maps, this will be for HD res, and the displacement maps.

[TJE]

Ehhh, where is this option? In the some-are-lucky-to-have version?