Chaos Corona Forum

Chaos Corona for Cinema 4D => [C4D] Bug Reporting => Topic started by: MircoTosti Studio on 2024-10-19, 12:43:31

Title: Interactive or Render with VFB opened on 9950x freeze system
Post by: MircoTosti Studio on 2024-10-19, 12:43:31

Hi guys,

after several tests I found that both in C4D ver. 2024 and 2025, when rendering scenes with VFB open instead of PICTURE VIEWER this causes a system freeze or a slow motion style slowdown of both the mouse and the entire system. Instead if the VFB is closed and you let the scene go to PICTURE VIEWER this does not happen.

Workstation with win11, X870e Aorus Master, Ryzen 9950x, 192GB ddr5 5200.
Ver. Corona 13 latest (Daily Build Aug 28 2024 from Chaos Corona About window).

Any possible solution?

Title: Re: Interactive or Render with VFB opened on 9950x freeze system
Post by: Nejc Kilar on 2024-10-24, 11:29:46

Howdy! Thank you for opening up a thread :) Does this apply to Interactive rendering or final render or both maybe?

Title: Re: Interactive or Render with VFB opened on 9950x freeze system
Post by: MircoTosti Studio on 2024-10-28, 15:10:15

Hi Nejc,

permanent system freeze often happens to me with interactive, while the system freezes partially/temporarily when I render the final part. Also, in the final render I noticed that if I don't open the VFB window, this temporary freeze happens less often than when I have the VFB window open.
Processor works consistently well at 100% when I render without sudden drops or gaps.. and the ram never reaches full usage with 192GB.

Any ideas?

Title: Re: Interactive or Render with VFB opened on 9950x freeze system
Post by: Nejc Kilar on 2024-10-28, 17:53:34

Hm hm, the devs are working on fixing some of the threading issues with high core count CPUs and I'm wondering if that'll resolve some of the issues you're having. I'll update this topic once the build is ready.

Title: Re: Interactive or Render with VFB opened on 9950x freeze system
Post by: bnji on 2024-10-30, 02:17:23

Hi there, thank you for bringing this to our attention.
Yeah, I'm wondering if it's a HW-related issue. (as it looks like)
We'll need to wait until the dev team releases the fixes mentioned by @Nejc
Sorry for the inconvenience.

Title: Re: Interactive or Render with VFB opened on 9950x freeze system
Post by: MircoTosti Studio on 2024-10-30, 12:06:45

Hi guys, I tried to lower the number of cores/threads of the CPU dedicated to the corona render from the corona settings that works in sync with that of c4d but the result does not change.. always same problem encountered. Furthermore it seems that the cores/threads even if set for example to 50% (8/16 instead of 16/32) always work all.

Title: Re: Interactive or Render with VFB opened on 9950x freeze system
Post by: tatarka on 2024-10-30, 16:52:10

try to run test under stable corona 11 or 12

Title: Re: Interactive or Render with VFB opened on 9950x freeze system
Post by: MircoTosti Studio on 2024-10-31, 14:22:26

Hi Guys,
I tried to install the hotfix2 version of corona12 but during both interactive and fixed rendering the workstation seems more stable even if it tries to slow down the system every now and then. I noticed that this occurs mostly with ver12 when rendering ends and denoising begins. In any case, it's better than 13 but the same problem remains despite the workstation working at full capacity and without holes or CPU drops as sometimes happens with 13.

Title: Re: Interactive or Render with VFB opened on 9950x freeze system
Post by: Nejc Kilar on 2024-10-31, 15:44:10

Hm hm, that build I was mentioned earlier, it is ready and you can download it from here:
https://drive.google.com/drive/folders/1u3jdwa6h-in-DT-PcMEqTsvUkyZVjjPh

Would you mind giving it a try and reporting back if this in any way shape of form helps with your issue?

Thanks!

Title: Re: Interactive or Render with VFB opened on 9950x freeze system
Post by: MircoTosti Studio on 2024-11-07, 14:59:32

Hi,
I installed the latest build but the problem remains the same, if not worse. While before the freeze or slowdown was not immediate, now it is almost immediately.

Title: Re: Interactive or Render with VFB opened on 9950x freeze system
Post by: burnin on 2024-11-08, 15:41:52

Does it happen w/ VFB2 or Legacy or both?

Had previously noticed similar pattern and switched to Legacy VFB.
Latest v13 daily seems OK for time being.

Title: Re: Interactive or Render with VFB opened on 9950x freeze system
Post by: MircoTosti Studio on 2024-11-11, 15:45:34

It happens to me with both versions. As a check I did the same tests in 3dsmax and I don't have these problems.

Title: Re: Interactive or Render with VFB opened on 9950x freeze system
Post by: burnin on 2024-11-12, 15:57:01

Ok, another thing then, C4D specific.
Would you care to check, if it's same as this: "100% cpu in IPR usage in daily? (https://forum.corona-renderer.com/index.php?topic=43872.msg229210#msg229210)"   

Title: Re: Interactive or Render with VFB opened on 9950x freeze system
Post by: MircoTosti Studio on 2024-11-15, 16:03:04

this thing happens to me too, as written in the post above C4D does not detect any changes to manually set cores/threads and always works at 100%

Title: Re: Interactive or Render with VFB opened on 9950x freeze system
Post by: TomG on 2024-11-15, 17:24:05

Note there was a bug, resolved internally, where negative numbers in the count of cores to be used in interactive was not working properly, and a few other scenarios where the value in the IR core count was not being respected. This fix will be in the final release, if not in an earlier RC.

Title: Re: Interactive or Render with VFB opened on 9950x freeze system
Post by: maru on 2025-02-19, 15:04:45

(adding the info to this thread too)
Can you please try installing the newest Windows Update? (KB5052093)
It seems to be the solution for 3ds Max users: https://forum.corona-renderer.com/index.php?topic=44441.0

Title: Re: Interactive or Render with VFB opened on 9950x freeze system
Post by: maru on 2025-04-04, 17:53:56

In case of any issues specifically with the 9950X CPU, please install this Windows Update:
https://forum.corona-renderer.com/index.php?topic=43755.msg232346#msg232346

Let us know if it helped!