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3Ds Max V-Ray animation frames render incrementally slower
show user profile  McArno
I'm rendering a simple turntable animation of a very basic wooden shed. At the start it renders FullHD resolution with about 2 minutes per frame, but after about 8 hours later frame time has increased to about 6-8 minutes!

There is no lighting nor detail amount change during the animation (as I said - very basic shed). The same anomaly of a render time increase has also appeared while rendering other camera views of the same project.
I got 6th gen i7 and 32GB of RAM, so I think it shouldn't be a hardware related issue. Render settings in V-Ray 3.4 are also pretty low, so I'm hoping maybe somebody has some clue about this situation.

So far I have just done a computer restart after about seven hours of rendering, because it then starts to render with 2 minutes per frame again, and then again goes slow with every next frame.
read 530 times
1/8/2017 10:09:43 AM (last edit: 1/8/2017 10:09:43 AM)
show user profile  kiko
Can you post a pic of your render settings? maybe you are not using multiframe incremental for your GI solution?


-- David --
read 522 times
1/8/2017 10:51:39 PM (last edit: 1/8/2017 10:51:39 PM)
show user profile  c0
2 minutes per frame = 1 hour for 30 frames.
After about 8 hours you start having problems.
So you are roughly 240 frames in?

After having restarted your computer, how long does rendering single frame number -say- 300 or so take? 2 minutes or 6-8 minutes?

This will tell us if the problem is related to the scene or to the software.
read 505 times
1/9/2017 8:53:06 AM (last edit: 1/9/2017 8:54:27 AM)
show user profile  McArno
Thank you for your replies. I'm using Multiframe Incremental IR GI solution.

@c0: When I started with 2 minutes per frame, then after 6 hours I was at frame 70, which took 9 minutes. Then I restarted my PC and it started from 2 minutes per frame again and increased with every next frame.

Here are my settings:
read 500 times
1/9/2017 11:23:07 AM (last edit: 1/9/2017 11:36:34 AM)
show user profile  c0

What happens when you *only* render single frame 70 directly after restarting your computer? Does this single frame then take 2 minutes to render or 9 minutes? Not sure if this makes sense...not an expert...
read 471 times
1/10/2017 10:51:32 AM (last edit: 1/10/2017 11:18:00 AM)
show user profile  McArno
I've learned my ways around animation rendering with V-Ray reading that walk-through tutorial, but thanks for the suggestion.

When I cancel the render after like 70 frames and render a separate one frame, it takes about the same time as the last frame rendered from animation. But after PC restart it renders one random frame quickly again. So the slowdown occurs both in animation and still frame.
read 465 times
1/10/2017 3:27:11 PM (last edit: 1/10/2017 3:27:11 PM)
show user profile  Boody
Just a long shot... I wonder if this is a job for a Disk Clean-Up? Would that be affecting virtual RAM? It's the re-start element that makes me suggest it..

Good luck with this, either way - I hope you get to the bottom of it.
read 458 times
1/10/2017 6:47:31 PM (last edit: 1/10/2017 6:47:31 PM)
show user profile  c0
Even though there is 32GB of RAM in your system, in this case I would keep Task Manger open and closely monitor the Performance tab to check for memory usage and hard disk activity (virtual memory, where the CPU is continuously busy swapping memory to the page file and back slowing the computer down), just to investigate.
read 450 times
1/11/2017 10:52:12 AM (last edit: 1/11/2017 10:39:27 PM)
show user profile  kiko
I'd change your setting from "Single Frame" to "Fly-Through" in the light cache options.

See if that helps.


-- David --
read 428 times
1/12/2017 12:08:58 AM (last edit: 1/12/2017 12:08:58 AM)
show user profile  c0

Single frame - this will compute a new light cache for each frame of an animation.

Fly-through - this will compute a light cache for an entire fly-through animation, assuming that the camera position/orientation is the only thing that changes. The movement of the camera in the active time segment only is taken in consideration. Note that it may be better to use World Scale for fly-through animations. The light cache is computed only at the first rendered frame and is reused without changes for subsequent frames.
read 422 times
1/12/2017 5:01:33 AM (last edit: 1/12/2017 5:01:33 AM)
show user profile  McArno
Thanks for your replies.

I must have forgotten the LC settings to single frame mode from when I rendered the exploded turntable version of the shed. Since Fly-through option calculates LC for the entire sequence, it gave me artifacts, as the shed was exploding into pieces and then back together again (and Fly-through option is meant for situations when only the camera is moving).

Interesting experiment that I haven't done yet is to measure whether the whole rendering process takes longer or only LC, IR or the actual final rendering process.
read 410 times
1/13/2017 9:21:07 AM (last edit: 1/13/2017 9:21:07 AM)
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