Chaos Corona for 3ds Max > [Max] General Discussion
Looking for a cause of Interactive Rendering slowdown (+Poll)
steyin:
--- Quote from: selene on 2019-10-03, 10:37:30 ---
Steyin, the difference between parsing times for IR and final renders should definitely not be so big - there is certainly some problem (maybe on our side). If you could provide us the scene so we could have a look at it, it would help us a lot with finding the potential issues.
--- End quote ---
I uploaded the scene in question. Initial parsing time was around 30 seconds, seems it is due to the Rhino geometry, but switching between viewports IR was ok. Every now and again it slows down a little though. Still, hitting render instead of IR parsing was 4-5 seconds.
lupaz:
Just finished my first test between Corona 1.5 Hotfix 2 and Corona 4 HF1.
The difference is HUGE!
Edit: Huge difference meaning Corona 1.5's IR is WAY better.
My process was:
In a windows 10 workstation, with 3ds max 2016,
1-I uninstalled Corona 4
2- installed Corona 1.5
3- I opened an old-ish scene that I knew didn't have the latest developments.
4- Made it simple enough to not run our of memmory or to make IR decently fluid.
5- Tested IR. Works nice.
6- Installed Corona 4
7- Opened the same scene
7.5- Dismissed the warnings about the new displacement and refraction (I think it was).
8- Set IR subsampling to 0
9- Started IR
10- cried when I saw the difference.
One thing to note is that with Corona 1.5 I get the "Fault Tolerant Heap" warning. With Corona 4 I didn't.
TomG:
Can you send us the scene via private uploader?
lupaz:
Here's a video:
I can send you the scene tomorrow, but honestly I believe the issue is scene independent.
selene:
--- Quote from: lupaz on 2019-10-04, 01:00:42 ---Here's a video:
I can send you the scene tomorrow, but honestly I believe the issue is scene independent.
...
--- End quote ---
Hello lupaz, thank you very much for your feedback and for dedicating your time and energy into recording the video - the slowdown is indeed visible in this case. Since you mentioned that you get "Fault tolerant heap" warning, it is highly probable that this could be the cause of the slowdown. "Fault tolerant heap" is a feature of Microsoft Windows OS, which can get automatically turned on if OS detected multiple crashes of some specific application (in this case 3DS Max). This feature may have severe performance impact on rendering speed. It is not possible to turn off this feature from Corona Renderer, we can only warn our users that it is turned on (as you can see in 0:28), but you can turn it off it manually, as described on our Freshdesk:
https://coronarenderer.freshdesk.com/support/solutions/articles/5000678431-windows-enabled-fault-tolerant-heap-for-3dsmax-or-dependent-processes-this-may-have-severe-perform
I recommend you to turn it off and try the Interactive Rendering again, hopefully it will be much better now. Please let us know if turning off this feature helps.
Anyway, if you could send us the scene you used for this comparison, it would really help us a lot, since we don't have enough "real-world" examples (scenes) where we could reproduce these kind of issues. :)
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