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Big render times due to big scene or wrong settings?
show user profile  Marvin
Have this project for some offices for a company. I made the ground plans, modeled everything (almost) in autocad and now i am trying to render in max with vray 1.50. The thing is that for the following pic it took 15 hour to render (plus approx.2 hours of light cache and irradiance calculations) at 1600*1200.

As you can see there is plenty of noise. If i raise the settings any higher the render times go off the roof! So i guess i am missing something here. Here are my settings

and this is the whole setup

I am rendering multiple views of the scene without hidding any geometry because its quite an open space with glass partitions.
and a close up of the specific scene

Can anyone spot smthing that may effect render times in such a bad way?
read 1622 times
3/5/2009 5:27:56 AM (last edit: 3/5/2009 5:29:46 AM)
show user profile  ea6b607
What are you rendering it on? I can find a 800mhz celeron and it will take days to render on that. ---------------------------------------------------------------------------
"Trying is the first step towards failure."
-Homer J Simpson-

read 1592 times
3/5/2009 7:19:45 AM (last edit: 3/5/2009 7:19:45 AM)
show user profile  del3d
Retarded render times... What is your cpu? What is the poly count on this scene? Perhaps your dwg import setting were insanely high? Like the curves and surface deviation etc...
Try hiding everything and start by leaving floor and ceiling on, then keep adding stuff in to see how it will effect the render time. You will find the culprit eventually. Render small 640x480 or something, drop your lc to 250 - to see results sooner.

edit: on a second thought, when I look at your wires polys looks normal. However you have plenty of vray lights there. Maybe their subdivs are high? Why not use one light per each exterior wall? You will end up with 4.
read 1588 times
3/5/2009 7:22:53 AM (last edit: 3/5/2009 7:25:35 AM)
show user profile  Boing
i've found that lots of vray lights can be slow to render, maybe try non visible planes at the windows with a light emitter material on them instead
read 1579 times
3/5/2009 7:40:35 AM (last edit: 3/5/2009 7:40:35 AM)
show user profile  mrgrotey
Just putting htis idea out there... if lots of vray lights are slow to render, would making one light that spans 6 windows make a difference? I dont use vray so I dont know

read 1575 times
3/5/2009 7:44:25 AM (last edit: 3/5/2009 7:44:25 AM)
show user profile  Marvin
From the chaos group site, on when not to use light cache
"Do not apply perfectly white or very close to white materials to a majority of the objects in the scene, as this will cause excessive render times. This is because the amount of reflected light in the scene will decrease very gradually and the light cache will have to trace longer paths. Also avoid materials that have one of their RGB components set to maximum (255) or above.

The truth is that there are a lot of white surfaces...But that is not going to change so i'll try also Quasi-Monte Carlo GI on secondary bounces.
As for the vray lights i'll put 4 big ones in front of the windows, although in previous projects it didn't make any difference. hardware setup is Pentium dual core@3.0, 2gb RAM on Vista and the poly count is around 1,5milion. The settings that i used for importing the dwg are the ones that i usually use without such problems.
read 1562 times
3/5/2009 8:13:12 AM (last edit: 3/5/2009 8:13:12 AM)
show user profile  Boing
if that's your problem with whites you could use an overide material, put a darker grey in the GI slot and leave the white for visible material only.
read 1555 times
3/5/2009 8:28:22 AM (last edit: 3/5/2009 8:28:22 AM)
show user profile  Marvin
If that's my you said!
Now i am going for del3d's way...

Results later
read 1549 times
3/5/2009 8:33:44 AM (last edit: 3/5/2009 8:33:44 AM)
show user profile  Marvin
Placing 6 big lights to the windows instead of 18(each window and a separate light) improved the total rendering time...from 6.05 to 4.19. Which is a big difference. Of course with many lights you have better control of the lighting conditions but...we can't have it all right?
read 1529 times
3/5/2009 9:59:50 AM (last edit: 3/5/2009 9:59:50 AM)
show user profile  Mashedpot8er
Not quite so right. You can have a single vray light and use a map as a projector. You can light it however you want across its length and width or whatever then. I did this quick thing to show you. Its just a grad with green, purple and red placed as a map on a vray light facing downwards from above

Cad Monkey

read 1502 times
3/5/2009 7:42:49 PM (last edit: 3/5/2009 7:44:19 PM)
show user profile  albongino
and Yes, If you use one big Vray light that covers all of your windows will improve your rendering times a lot.

read 1490 times
3/5/2009 8:38:37 PM (last edit: 3/5/2009 8:38:37 PM)
show user profile  Garp
I undestand your concern about keeping the rooms that are not directly visible in the render but still, if the wireframe pics show the scene as it is when rendered, there's quite a waste of calculation there.
In the non-visible parts, get rid of the furniture, put a single light per room, no reflection/refraction to the materials, etc...
For the visible glass panes, you can set the IOR (refraction) to 1. It won't make any visible difference as the ray shift is likely to be smaller than one pixel.

There are certainly more things others can think about to simplify the scene without changing the quality. Just my 2 cents.

read 1482 times
3/5/2009 9:31:33 PM (last edit: 3/5/2009 9:31:33 PM)
show user profile  Marvin
So after a while here is what i got! Render times around 7 to 15 hours in total for each camera at 1754*1240. i have less noise comparing to what i had at the beginning! I think that these are acceptable times in general. I need to hear your opinions, not only for the render part!

Here are my settings for the final renders that you see

Reception desk

Office 1



Conference room


read 1382 times
3/27/2009 3:41:40 AM (last edit: 3/27/2009 3:43:08 AM)
show user profile  Westcoast13
Pretty nice renders mate. A lot of work's gone into this i guess!!

One thing that really stands out though, is the repeating books (or software boxes, whatever they are!).

My Turbosquid Area

read 1378 times
3/27/2009 3:45:00 AM (last edit: 3/27/2009 3:45:00 AM)
show user profile  Marvin
Thanks westcoast13...i know the issue with the books it's something that has to be done!
The things that i have spotted is the books...and the blotchiness(if i write it correctly) to some curtains. It is probably a low subdivision problem from the lights.
read 1371 times
3/27/2009 4:00:36 AM (last edit: 3/27/2009 4:00:36 AM)
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