Chaos Corona Forum

Chaos Corona for 3ds Max => [Max] Bug Reporting => [Max] Resolved Bugs => Topic started by: pokoy on 2016-11-08, 11:23:57

Title: Bloom and Glare - black with NaN pixels
Post by: pokoy on 2016-11-08, 11:23:57

So I may have a scene that I'm using for testing that seems to render NaN pixels occasionally. Bloom and Glare will turn completely black even if only one NaN pixel is present in the VFB.

Where/how to upload?

Title: Re: Bloom and Glare - black with NaN pixels
Post by: romullus on 2016-11-08, 11:33:12

https://corona-renderer.com/upload/

Title: Re: Bloom and Glare - black with NaN pixels
Post by: pokoy on 2016-11-08, 12:42:10

Scene uploaded to Dropbox since filesize exceeded 256 MB, filename is 'Coron_1.5.1_Office_Night.rar'... forgot an 'a' there.

There were several issues with the file, including reproducible crashes:

- Scene uses LightMtl as the sole lighting source.
- DR is enabled, 4 DR nodes were used.
- One DR node threw out the 'fault tolerant heap' error. This was on a machine with more than enough RAM which typically chews through everything I throw at it. Disabled FTH globally on this machine, it rendered fine after that. RAM usage in this scene is around 10GB, the node has 64GB.
- The scene produces Nan pixels somewhere at pass 300, from my test it is reproducible but you need to let the render go on for a while. Denoiser will produce that square artifact, Bloom and Glare will turn the image pitch black.
- Crash to desktop while zooming in in the VFB in order to see the NaN pixels and while using RMB to inspect the values of these pixels.
- Crash to desktop upon cancelling the render, seems to be reproducible, happened 2 times. The crash occurs a while after Corona collects data from DR nodes.

Never had any crashes when rendering on a single machine. NaN pixels occured in the past regardless of DR or single machine rendering.

Hope you'll be able to track down the issues, contact me if you need more info or anything else: mg[at]mswee.net or through PM here.

Title: Re: Bloom and Glare - black with NaN pixels
Post by: Ryuu on 2016-11-08, 14:22:35

Is it similar to this problem? https://forum.corona-renderer.com/index.php/topic,13812.0.html

Anyway, Ondra is already investigating the NaN issue.

Title: Re: Bloom and Glare - black with NaN pixels
Post by: pokoy on 2016-11-08, 14:25:31

Quote from: Ryuu on 2016-11-08, 14:22:35

Is it similar to this problem? https://forum.corona-renderer.com/index.php/topic,13812.0.html

Anyway, Ondra is already investigating the NaN issue.

I don't think so, as far as I can tell B&G will produce a black image with NaNs. Then again, my knowledge of the internals is limited...

Title: Re: Bloom and Glare - black with NaN pixels
Post by: Ondra on 2016-11-09, 12:08:25

Should be fixed, try the next daily when it is out

Title: Re: Bloom and Glare - black with NaN pixels
Post by: pokoy on 2016-11-09, 12:12:24

Thanks, will test!

Title: Re: Bloom and Glare - black with NaN pixels
Post by: pokoy on 2016-11-15, 14:53:30

Is this fixed in 1.5. hotfix 2 or only in new dailies?

Title: Re: Bloom and Glare - black with NaN pixels
Post by: maru on 2016-11-15, 14:54:55

I believe it's the next daily, but it probably won't hurt to test hotfix 2 too. :)

Title: Re: Bloom and Glare - black with NaN pixels
Post by: pokoy on 2016-11-15, 14:59:28

I'm asking because the fixes for hotfix 2 looked like they were exactly the issues I have posted above. If they're not there's no point in testing, if they are I would test to confirm.

Title: Re: Bloom and Glare - black with NaN pixels
Post by: Ondra on 2016-11-15, 15:05:37

this fix was actually simple enough to do it in hotfix 2, so go ahead and test it! ;)

Title: Re: Bloom and Glare - black with NaN pixels
Post by: pokoy on 2016-11-18, 15:33:59

So, just tested with 1.5.2 and unfortunately I'm getting exactly the same problem - NaN pixel(s) > Bloom&Glare black result. It didn't crash yet when collecting data from DR servers but it didn't crash every time back then so chances are it still may crash, only not regularly.

Ondra, in the scene I sent you the NaN pixels will always appear on that picture on the wall. It's either the glass or the object behind or a combination of both that will produce them.

Title: Re: Bloom and Glare - black with NaN pixels
Post by: Ondra on 2016-11-22, 00:36:46

ok, this was actually a separate bug with exactly the same result. I fixed this one as well

Title: Re: Bloom and Glare - black with NaN pixels
Post by: pokoy on 2016-11-22, 13:27:28

Great, thanks! Will the fix be in the next daily? I would test again just to be sure...

Title: Re: Bloom and Glare - black with NaN pixels
Post by: Ondra on 2016-11-22, 15:35:07

yes, but the daily will be after corona academy... contact me on skype to get the build sooner

Title: Re: Bloom and Glare - black with NaN pixels
Post by: pokoy on 2016-11-22, 15:37:05

I don't think I got your skype contact, could you PM it to me? Thanks!