Random V-Ray hangs toggling enhanced region in this scene

[1funk]

I've been running into several "random" hangs which require modo to be killed and restarted. Most of them happen if I quickly stop and start RT or change enhanced regions.

I have managed to get something reproducible with this stripped down scene, which seems to be related to changing enhanced regions.

MODO 11.1 453071
V-Ray 3.52.01 27482

1. Start modo and go to the "Render V-Ray" layout
2. Load the scene
3. Start RT GPU
4. Press the "Restart" button 4 times
5. Right click on the VFB render and choose "er1" (this is a saved enhanced region)
6. Right click on the VFB render and choose "er1" again, to toggle it off - do this a couple of times
7. Keep repeating steps 4,5 and 6 until you get a hang

RESULT: After repeating a few times, modo hangs with a blue spinning cursor and (not responding) in the title bar. I have to force close modo and restart
EXPECTED: No hangs

[vladimir.nedev]

Yes, I can reproduce the issue, thank you for the scene.

Greetings,
Vladimir Nedev

[1funk]

I think this might be a denoiser crash. I was messing around with the same scene today and after disabling the denoiser, these steps no longer hang

[boyan]

Hey Funk,

Thank you for the post.We've had the issue in our system. Keep you posted about it.

I thik I've posted in skype group some of the workarounds to avoid these glitches. As you can leave denoiser enable, but set to zero "Image Effect update freq.".

It seems regression with MODO11.11 # 453071 on WINDOWS. The issue can not be reproduced with MODO 11.11 # 453071 on MAC or downgrade versions (MODO 11.03) on Windows.

Cheers,

EDIT: Also, Can you recreate it with the latest nightly build - # 27535 - 20170716 ?

[1funk]

I'm using nightly 27535 with 11.1v1 and still see the problem

[1funk]

I can also reproduce it in 11.0v3 and 10.2v4, so it doesnt look like a modo regression to me

Make sure you are using RT GPU

[boyan]

Hey Funk,

Thank you for the feedback. Well, Can you check the GPU driver version, I would like to compare with main - 382.05. I think this might be the problem.

Tested was recorded you can find it here: https://my.pcloud.com/publink/show?c...lUbv2cTyhA502X

MODO11.11 # 453071 on WINDOWS || V-Ray # 27535 - 20170716

Cheers,

[1funk]

I installed the windows 10 creator update today, which also updated the driver 382.05

I'm still seeing the same problem. It crashes 11.1v1, 11.0v3 and 10.2v4

I'm using nightly 27567

[1funk]

I added a video to the zip attached to the first post too.

[vladimir.nedev]

I found one issue where just clicking multiple times on the RT restart button (while running RT GPU) would hang it.
It doesn't require enhanced region or denoiser. This issue is fixed for the 2017.08.31 nightly build.
The enhanced region one, I still need to investigate.

Greetings,
Vladimir Nedev

[1funk]

I found one issue where just clicking multiple times on the RT restart button (while running RT GPU) would hang it

I didnt run into this but thanks for fixing it

[vladimir.nedev]

So, this is the same issue as this one https://forums.chaosgroup.com/forum/...render-regions
Basically if you have lens effects or denoiser active in RT, and then change the render region (enhanced or normal), you will randomly get a deadlock.
The issue should be fixed in the 2017.09.02 nightly build.

Greetings,
Vladimir Nedev

[1funk]

Thanks Vladimir