Ever since we upgraded to V-Ray 3.3 for 3ds max I’ve noticed that assigning render elements exponentially increases rendertimes. Abnormally longer times, really.
For instance, one scene that was taking 2 hours to render was taking 9+ hours after I enabled a couple render elements (namely VRayExtraTex with VRayDirt for occlusion, VRayReflection and VRayZDepth).
Are there any changes I might have skipped and am not setting properly?
Do you have any data passes with filtering enabled? If the values are high contrast (eg point position), then this kills render times. I haven’t encountered this in Vray for 3dsmax, but I did see this happening when I worked in a studio using Maya.
Thanks for the reply, Patrick. Unfortunately, filtering is not causing this. Tried both with and without filtering with no success. I’m starting to think this is some sort of bug, but that should be the last suspect.
Could be the extraTex, there’s a switch ‘consider for antialiasing’, disable it. : )
It’s likely very rare that someone would need that one, could be worth considering disabling it by default? As rendertimes can go up dramatically with it enabled and usually the beauty AA will take care of the needed sampling.
What the others said - if any elements have the “consider for antialiasing” option enabled - disable it.
Best regards,
Vlado
Surely adding a VrayDirt will always increase render time, and wouldn’t it increase as the detail/complexity of the scene increases.
Sounds right, but a jump from 2 hours to more than 9 doesnt sound right
By the way, this doesn’t seem to affect progressive image sampler, since it’s still really fast generating the elements.
I also reduced subdivs on dirts in ExtraTex elements after moving to 3.3 - quality is the same and every little bit helps.
Try delete an re-create render elements.
Have you tried rendering tests with each of your render elements active one at a time? I’m curious if the slow down is additive or whether it could be pin pointed to just one of the render elements causing the problem.
Actually yes. The only element that does not seem to affect render times is the VRaySampleRate. ExtraTex, Reflections and ZDepth all mess it up.
Having high increases in Scenes with ExtraTex AO is totally normal for me. THat’s why I render AO sepreately most of the time
speaking of the VRaySampleRate pass, how dose the SampleRate look with and without render elements? is there a change between them? (silly thing to ask)
Sample rate looks just fine. Mostly blue (I’m controlling the Subdivs to make sure I’m not frying the sampler).
Try to disable all ExtraTex elements and see if they have the biggest impact on the render time.
If you could provide the scene for investigation we may find out why the rendering becomes so slower.
Another thing that is interesting to check is the memory usage, if the RAM is occupied up to 100% and windows start swapping information on the HDD they it is perfectly normal to have such slowdowns.
Thanks, Svetlozar!
The problem really lies on the AO (VRayDirt) bein on the render elements. As soon as I remove it, the render flies.
Funny thing is the rendering is not taking too much memory (it happens even with all materials overriden) and the VRayDirt map is pretty much default.
The scene is here for download if you’re willing to take a look.
I’m unable to download the scene. Would ti be possible to send us the scene to support@chaosgroup.com
Didn’t the subdivs for the VRayDirt get changed so you now don’t need to have them so high? We have old renders with 64 subdivs that only need 8 now to get the same quality.