Modo 11.1v1/11.0v3 freezes in RT-Cpu mode when changing the render regions.

[brijcharan]

Hi there.

Found a bug I was working with modo support on.

Basically if I run RT render, with a region, and change the region a few times in the UI, modo locks right up.

I ran the event log from vray and realized that the last task running is always the denoiser.
If I disable the denoiser, Modo no longer hangs.

I can provide the problematic scene file if necessary.

In the following screenshot of the event log, denoiser is disabled and the crash doesn't occur, then I enable the denoiser and reload the RT rendering engine, and the crash occurs.
Unfortunately I cannot save the output from the log since modo locks up.

[BVA]

We talked about this on skype recently too.... I also get these random modo freeze ups when changing render regions but am not able to get exact steps.

[brijcharan]

I'm almost positive it's the denoiser.
Why the denoiser does it, I'm not sure.
You're the second one to mention Skype channel, is it open for users?

[boyan]

Hey Brijcharan and BVA,

Thank you for the feedback and posts. The issue was logged to the system. I will keep you posted. Meanwhile, to avoid the problem when you use Denoiser, disable the option "Image effect update freq." as set it to "0".

Cheers,

[brijcharan]

Hey Brijcharan and BVA,

Meanwhile, to avoid the problem when you use Denoiser, disable the option "Image effect update freq." as set it to "0".

Cheers,

Thank you Boyan!

[vladimir.nedev]

So, this is the same issue as this one https://forums.chaosgroup.com/forum/...-in-this-scene
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

[brijcharan]

Thank you!