Ray/s accidentally goes low

[sicrum]

Hello everyone.

I was working on the scene and everything was perfect.
But suddenly interactive render became very slow.

I have spent 5 hours trying to resolve that issue...
Finally, I left walls and portals and added mtl override (portals are excluded).

Here is screenshot: http://screencast.com/t/Pa0PN2qOax

Super simple scene but rays/s is under 300k. :(
If I add same objects into a new scene Rays/s is 1.5 million! But if I add entire the scene with all objects then it is slow again....

I tried to remove geometry that I have added after last fast render, but no luck....

Any ideas how to troubleshoot issue like that?

Thanks

[Ondra]

what is your CPU usage? Any photometric lights in the scene?

[sicrum]

what is your CPU usage? Any photometric lights in the scene?

CPU usage is 90 +/- 5
No photometrics, just default Corona environment light,  walls and 3 portlals in windows...
All other objects are hidden

[sicrum]

http://screencast.com/t/kjbIlJ0Ti6C

Check this out. No object at all, ray/s is 200k....what's wrong there???
On empty scene passes are usually increasing faster than seconds in rendering time

[romullus]

Could you run Corona benchmark? https://corona-renderer.com/benchmark/ Maybe something wrong with your hardware?

[maru]

That's Corona 1.2. Any chance you could try with a newer version?
I do not remember when error messages were added. Maybe that's bitmap paging, or FTH? See:
https://coronarenderer.freshdesk.com/support/solutions/articles/5000680212
https://coronarenderer.freshdesk.com/support/solutions/articles/5000675862

[sicrum]

Could you run Corona benchmark? https://corona-renderer.com/benchmark/ Maybe something wrong with your hardware?

Benchmark scene works perfect.
And I got this issue again with my scene :((

I have updated corona to 1.4 but it happens again. Rays/s is 3000-4000 for last 20 mins and just nothing happens...
In Resources Monitor there are a lot of hard faults for 3ds max:


And also there are still about 4GB RAM free, so I am not running out of the memory.

Restart 3dsmax helped but not for a long time. After couple interactive renders it is not working again

[maru]

I have updated corona to 1.4 but it happens again

Why not 1.5.2?
Can you please submit a support ticket about this and provide your registered email address? https://coronarenderer.freshdesk.com/support/tickets/new