The time limit isn't working when rendering multiple tiles. #92106
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Reference: blender/blender#92106
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System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 2060/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 471.11
Blender Version
Broken: version: 3.0.0 Alpha, branch: master, commit date: 2021-10-09 19:40, hash:
79425ed326Worked:
Short description of error
The time limit isn't working when rendering.
Here are my settings
Exact steps for others to reproduce the error
Enable time limit and render an image
Added subscriber: @TasosK
#95786 was marked as duplicate of this issue
Added subscriber: @PratikPB2123
Added subscriber: @deadpin
Changed status from 'Needs Triage' to: 'Needs User Info'
Rendering will stop if:
Whichever comes first.
Is that the case for your scene? Did it run out of samples or hit the noise threshold before the time limit?
I set the time limit to 10 minutes.
10 minutes passed and the render keeps on going, instead of stopping.
Ah, that wasn't clear from your report - does it ever finish? You'll have to attach an example .blend file or provide some additional details. The time limit seems to work for me here. I tried 30 seconds and it stops after ~34 seconds here (it won't be exact).
I can't upload the .blend file.
Instead of stopping rendering at 10 minutes it stops roughly at 14 minutes.
Also the aspect ratio of the image is 21:9, the resolution is 2560:1080, and it needs 2 tiles to render the image. Do you think this is the problem ?
Changed status from 'Needs User Info' to: 'Confirmed'
Ah, yes, that's it. Tiles are currently problematic when using the time limit as there's still design work to do there.
The time limit isn't working when rendering.to The time limit isn't working when rendering multiple tiles.Okay then. How can I set it to 1 tile only ? I rendring with cpu btw
If you really want to use the time limit then to force 1 tile do the following: Render properties -> Performance -> Memory -> Uncheck "Auto Tiles"
Thanks!
Added subscriber: @leesonw
I tried this on the latest commit as it seemed to work. I tried setting the time limit to 30 sec and it stopped at 48. Then I tried 20 and it stopped at 29, the timer does seem to count down from 20 but I am guessing the limit is approximate as I believe it must render 1 whole set of pixels. Can you check if it still does not work for you?
Yeah, it still doesn't "work", because it hasn't been decided what "work" really means when a time limit is used in the presence of tiles :) The time limit should be for the entire render, but a more appropriate example actually shows that it's instead working per tile today.
Take the following .blend. It sets a 20 second time limit and renders with a particular configuration to produce 6 tiles
#92106-tile-timelimit.blend
My CPU render time is very close to 120 seconds (a full 20 seconds per tile) even though that's not what I expected(?) and for which generates quite different sample counts for each tile etc.
I think this just needs to be a Design task until we can figure out what to do about the situation. There's multiple ways this can go ranging from "Disable time limit when tiles are in use" to "Attempt various ways of better dividing the time up for each tile based on area and content... somehow"
Makes sense. I would guess that time needs to be divided up between all the pixels and the distributed according to the number of pixels in the tile. Logically I'd expect to have the time be the total render time not a per-tile time.
Added subscriber: @juang3d
It would be easier if the tiles would work in a progressive + additive multi pass way, so each time can be 10 seconds for example, and then count the total render time, when the render time reaches a point where it’s near a limit there maybe be a deviation of some seconds so the last tile reaches the same amount of samples as the other ones
Added subscriber: @Raimund58
Added subscriber: @ponomarovmax
Added subscriber: @blenderrocket
Another problem to consider directly related to this, is that smaller/border tiles receive much more samples as currently they are given the same time limit as larger/full size tiles. This results in some very visible artefacts at the tile borders due to the different noise levels: