Viewport rendering have no obvious way to cancel #112634
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Reference: blender/blender#112634
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System Information
Operating system: Windows-10-10.0.22621-SP0 64 Bits
Graphics card: NVIDIA GeForce GTX 1650 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 497.17
Blender Version
Broken: version: 3.5.0, branch: blender-v3.5-release, commit date: 2023-03-29 02:56, hash:
1be25cfff18bWorked: (newest version of Blender that worked as expected)
Short description of error
Viewport rendering have no obvious way to cancel. This is even more evident if you choose to keep current UI for rendering in preferences.
Hi, thanks for the report. Did I understand correctly that the cancelling render process freezes blender? In that case, I'm not able to confirm the issue.
I suspect this is similar to #98941. Can you confirm?
It may take some time for blender to resume after canceling/interrupting the render process.
Not exactly, blender is hanged when big project, but the main problem is no option to stop animation in case of function as: View -> Viewport Render Animation - there is no stop button for this or cancel.
Yes, there is no button in status bar to cancel the
viewport render animationBut you could still cancel it by closing the "render window" (
Xbutton in top right corner)It was not possible, coz blender was like hanged. The button should be and buttons play/stop should be related to five option to push.
Do you expect button like this for canceling the render? or the buttons mentioned in the timeline?
In any case these buttons can not be used when software is not responding.
Yes.. this buttons must be related for this function and when animation. Take point if render window is docked in blender.
The case about hanging is bad and due wrong threading core app and operation area as computation. Separated can still allow operate GUI and kill the computing in this case.
I guess you're expecting a button in blender's task bar (as shown in first image) but I did not completely understand your last message. Could you rephrase that?
Not only task bar near progressbar but also stop must be next to buttons play, now no any reacting when time line is moved here.
Explanation for CPU core thread is complicated coz I don't know well sources code here to be super oriented, but my experience around coding and around Blender GUI cases like hanged interface ("waiting" in top belt when something wrong) show me that something is wrong around app architecture again when multi-core CPU. In short looks like multithreading not working correctly or not exist. Simultaneous multithreading (SMT) must separate GUI, to give option to kill some process and thread. In Blender is impossible - only kill process from OS manager (ctr+alt+del) if something is wrong, coz app not checking status, only focus on computing is always available.
Simple test around can give result that is possible, and multi-core must be ral not like old CPUs and when blender was developed for this time ago..
https://stackoverflow.com/questions/24687694/c-how-to-divide-cpu-work-through-threads-exactly-in-non-parallel-task
https://stackoverflow.com/questions/65428348/c-kill-a-thread-in-destructor
I guess the progress bar is not shown, because you have playhead moving. In any case, I think that the issue here is rather that blender hang up. I can't reproduce that issue. Please provide .blend file where this happens.
Also check if this happens with alpha build from https://builder.blender.org/download/daily/. You are using version 3.5 which is quite old.
This same on:
Broken: version: 3.6.4, branch: blender-v3.6-release, commit date: 2023-09-25 13:24, hash:
21bfc5e7fe3fThanks for checking, but we still need the blend file.
nah.. done. : )
https://recordit.co/AoV0MCjo0j
Thanks for video. So the UI does not freeze, it just doesn't react to mouse inputs, which works as expected. I can see this being known issue, as this would probably need new/improved design. But if you press ESC key, it will stop rendering...
Will confirm then, but UI module may close this as it is not really a bug.
Problem with stop animation when View Viewport Render Animationto Viewport rendering have no obvious way to cancelWell.. the project is small, and blender not freezing on this project but on other doing often, then esc can be applied, but right.. I not used esc. In fact the related problem is about separate core GUI manager from other computations to prevent hanging in other cases.
We can find some huge project from https://cloud.blender.org/p/gallery/57e507b80fcf29412d1f1e53 then test on some lower hardware. Most of users have good hardware, but scaling project/hardware not solving the software issues around and main logic of how GUI/computing is organized.