View Full Version : Calculating Render Times

01-29-2009, 09:31 AM
I'm using LW 9.6 to render four shots in our farm and I've been asked to provide an estimate of how long the shots will take to finish rendering. I've tried doing some basic math to supply a ballpark answer, but I'm wondering if there isn't a more accurate way to get an answer that what I'm currently doing. Here are the shots and the frame ranges.

intro 6820-7240 (420 frames)
camA 7340-9180 (1840 frames)
camB 7340-9180 (1840 frames)
camATransp 7340-9180 (1840 frames)

These are all closeup shots, so the entire frame is filled. I'm using three spot lights and one area light with raytraced shadows and raytraced reflections. No fancy SSS nodes or anything like that. Anyway, my frames are rendering in (on average) about 30 minutes per frame. So...

intro 420f*30m=12600m/60m=210h
camA 1840f*30m=55200m/60m=920h
camB 1840f*30m=55200m/60m=920h
camATransp 1840f*30m=55200m/60m=920h

920h*3+210h=2970h/10(farm nodes)=297h/24h=12.375 days

Go easy on me when you reply. I'm an artist. It took me three attempts in high school to finally pass Algebra 1 with a C- :)


01-29-2009, 10:40 AM
Seems correct to me. That's from a total render time. I'm not sure how much extra time there is to send data between the 10 machines, and any other things like that...

01-29-2009, 11:34 AM
Yeah I'm not really taking I/O time into consideration, but from what I've seen it doesn't have that huge of an impact on time on our setup.

That first shot, the one that was supposed to take 210 hours to render just finished. If I take the 210 hours and divide it by my 10 nodes, I get 21 hours. In reality it rendered in 18 hours, so that's a fairly close estimate in my book.


01-30-2009, 05:07 AM
Well id say if u got renders that long send it to a Render Farm. Also I find it takes less time to render long scenes if I render them out in sections 1000 frames here 1000 frames there depends on what im doin really.

01-30-2009, 12:38 PM
Render farm, ay? I'll have to look in to that. You kids and your new-fangled devices. :rolleyes:

01-31-2009, 04:17 AM