VRAY displacement mod problems

[Yordan Zarev]

Thanks, here's a second question - does subdividing the mesh that i am displacing have a significant effect ? i was reading the documentation on VRayDispl. mod and as far as i understood displacement subdivides the mesh until the edge of the faces meets the input in the edge length parameter, so i figured that a denser mesh would mean less work during render time - does that make any sense ?

[Svetlozar Draganov]

For the subdivision stage yes, but in general it shouldn't affect the rendering much.
The render time should be better with denser meshes since V-Ray will spend less time for subdividing but in terms of memory usage low poly meshes should use less memory.

[Yordan Zarev]

I plan on testing this a bit more this weekend, cause when i was tweaking the scene last time i wasn't very systematic in the process to definitely state what had the biggest impact on the scene, but the problem with RAM that got me into lowering the settings on the displacement arrived while presampling displacement in the light cache or the IR passes (can't remember) - i got a message in the rendering status stating - unloading geometry and that go the render time to around 600 hours, i didn't even got to the rendering of the image

[Svetlozar Draganov]

You may try to use Brute Force as a secondary bounce engine since it is more optimized in terms of memory usage.
Light Cache requires loading all assets in advance in order to be calculated, Brute Force and IM could load the information on buckets.
Another option which I already mentioned is to precalculate LC with displacement disabled, then load LC map from file activate displacement and run the final rendering.