Environment fog with vray gpu for sketchup is very, very slow!!!

[luisgamino2]

Hi
I like a Lot the environment fog effects with vray... But i can't use it, is very, very slow, something needs to be done with this, in almost every scene it takes 1/3 more time than without environment fog efects, i remember in the update 1 or 2 for vray next, vray for 3d max and maya got something called probabilístic shading, something called like this and this helped to render faster environment fog, we didnt get probabilístic shading in vray next for sketchup nor in update 1 Neather in update 2, in vray 5 environment fog is still very slow. Something is necesary to get faster environment fog, right now is almost useless

Thanks in advance
Best regards

[nikoleta.garkova]

Hey luisgamino2,

The Probabilistic shading you are referring to is concerning VRayVolumeGrid, which, compared to Environment Fog, works with a grid based cache formats (reading data from an input file, i.e. .vdb, .f3d, .aur). Environment fog is a general purpose volumetric effect and should be working the same way in the integrations you mentioned.

That being said, it would be very helpful if you could provide a project file demonstrating the issue, so we can inspect it and see if any improvements to the settings could be done. You can forward such files via our contact form, just make sure to mention this thread in the subject. Thanks!

[luisgamino2]

Hi Nikoleta Garkova

I want to keep learning sorry for the late response, i know why vray environment fog was very slow, i was enabling the skatter option, i tried 100 bounces is too slow i know it has a Lot of bounces, then changed to 4 bounces was very slow too, then i changed to 2 bounces it was a little bit faster but is still very slow for light cache and for rendering the image, right now i AM using environment fog with skatter option disabled (is a bit faster), so enabling skatter option gives you a really Nice environment fog, but in this option already vray says it can be quite slow, and is very slow this option, so can i get a Nice result with out this option??? And Also what's going on with emission parámeter???

I want to keep environment fog on, but don't want this long render times
Thanks in advance
Best regards