I have this interior scene that has a huge render time. I have a lot of IES lights, but other than that I don’t see anything that would warrant a 106 hour render time, do you?
Does it change a lot if you make all the ies lights use the same file? If so, maybe there are some bad ies files…
Does the time change drastically if you turn off and replace the VRayIES lights with some standard vray lights? (just for a test)
Damn that’s a long time though!
try an override material to see if materials are doing it. maybe displacement?
Everything seems fine. I turned off displacement and applied a material override. All the lights are using the same file… I did notice that when I cancel the render it shows “hair fur”, but I removed that awhile back. Why would it be calculating it if it no longer lives in the scene?
Well, I had a very sim sounding prob once. I had to merge my objects into a new scene and not merge the hair fur IIR…
yes, merging did get rid of the hair fur, but I am not sure if it will help my render time. I’ll follow up tomorrow AM
Here is the file if anybody cares to try and troubleshoot. The model is complete with textures just in case any of my materials is the issue.
Really crazy settings, dual quad core nehelem + 24 gb ram and 3h to calc LC… 
Ill tune a lil bit settings and ill send u back file
Btw:
‘‘Everything seems fine. I turned off displacement and applied a material override. All the lights are using the same file… I did notice that when I cancel the render it shows “hair fur”, but I removed that awhile back. Why would it be calculating it if it no longer lives in the scene?’’
Did u remove it under Atmosphere effects? (Click 8 and check)
feel my pain! thank you
hi, i just opend the scene. i think there are more things to tweak… first thing i get is the lc passes is set to 1. as your pc has more than one core, you should use them. set the lc passes to your number of cores of your pc.
second is the dmc sampler. try to set it to the default values. you set the min samples to 171 and the global multiplyer to 4…
third your maps seem to be a little to big. what size is the displacment map? i think it is 3800px wide. try to you smaller maps. 1024 px are surely enough, as long as the stones aren´t in the front.
I have the i7, which Vista is seeing as one core. I do have 5 other stations, all running dual core, do I include those?
Heya
There is something strange in ur scene. Its the second time I encounter it… Basically out of 8/16 threads my pc is using only 1 cpu/threat to count LC. I did remake all the settings.
Anyway, Vray-RT render it just fine After 1-3 min I got this: / Gama is mess up, I’ve customized mine slightly… doh!
Any clue on what is causing the issue?
i think this is the displacment. and the map size.
where do you use the land08.tif. if it is only for reflection you can reduce the size. the bigger the mapsize, the more memory is needed.
I was getting really nice images in hours using all the same maps. All of a sudden my render times sky rocketed and it was when I cut holes in the ceilings and dropped cans in with the IES lights.
An Evil BUG! It want to kill ours pc! 
OK back to facts, fixed, I’ve remaded all settings so it should run fine, 500x400 I’ve rendered in around eeee… Hang on still rendering
btw what is ur render station?
I doubt if its the maps, Im running 24 gb system from which Vray got 20gb in settings. The scene during renders eat only 3 gb so its quite light.
okay, there´ s like dadal said some other thing wrong. there´s only one bucket rendering… i don´t know why… i ll try a little more…tomorrow
Not really sure if it will help, but if you are only seeing one core rendering you may want to run the “use all cores” script in case this scene somehow get set to use only 1 (it is scene dependent).
Run this in your maxscript listener if you think it might help:
renderers.current.system_numThreads=0
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I create a 3dsmax - renderpreset with default V-Ray Settings and save only the “V-Ray Adv 1.50.Sp4a” Categorie. Common, Effects, Enviroment… was not necessary.
After I load the renderpreset the scene renders “normal”.