Messages

1

[Max] I need help! / Re: Corona renders to black

« on: 2019-07-22, 08:38:08 »

Hi all!

Last weekend I tried something. Enabled autosave for CXR files. Attached, you can see the one before last autosaves state open with Image Editor, being the last one completely black. My thoughts when analyzing timestamps: the scene renders OK until certain point, where black pixels (NAN) start spreading slowly - they don't appear until the process is way in progress, few hours in. Then, by the end, they populate scene very quickly until final pass/denoising - or could be during denoising. I saved few CXR states - last one was saved at 1:26pm, completely black, and previous one (the one you can see as attached JPG) was saved at 1:17pm, 9 minutes before.

226 passes. Could this be an issue? Too much passes? I set limit 2% noise, unlimited passes, to get clear image from heavy scenes.

BTW, could this happen if/because I have two 3DMax instances rendering two different scenes at the same time? Shouldn't it happen to both of them? :/

I can't attach the scene because it is heavy, almost 300mb.

2

[Max] I need help! / Re: Corona renders to black

« on: 2019-07-19, 11:22:26 »

Before reporting, please update to Corona 4 Hotfix 1 Your issue may be already fixed in final release. https://corona-renderer.com/download

Don't know what a NAND is except for videogame console scene.

Sorry, my mistake, it's NAN - Not A Number. Basically it means that renderer got invalid data for specific pixel and can't convert it to colour.

My version (work) is:
Corona version: 4
Full-speed, Non-debug, MaxSDK 2017
Build timestamp: Jun 10 2019 16:00:26
Defines: Wide RGB

NAN sounds logical... I think I could enable Corona CXR autosave, but I don't know if I will get a black screen autosave in the end :/

I have asked a colleague about this: is there any way to "rescue" current CXR calculations from memory if 3D Max crashes? He said it is stored on memory, not in HDD, so I guess Corona autosave would fit the issue. It is in order to hopefully "resume from file" after killing 3D max process on crash and reopening scene. Would this work?

3

[Max] I need help! / Re: Corona renders to black

« on: 2019-07-18, 19:07:02 »

Hi, thanks for the answer. Don't know what a NAND is except for videogame console scene. I am using Corona 4, february build, don't know exactly version. Will report.

4

[Max] I need help! / Corona renders to black

« on: 2019-07-18, 09:38:40 »

Hi all, new in the forum but not with Corona here! :)

Just a question. At work, I start a render of a scene as usual. No problems. But sometimes it happens that the render, I don't know why, starts spreading black pixels randomly, in a similar way as they appear when pre-computing lighting, and in the end the render is completely black. Instead of light ray pixels, with RGB adjusting to finally get the render, I see black (pure black) dots (pixel-size) spreading, I call it "black fireflies" instead of usual light fireflies artifacts, until the completely black result.

This happens very rarely (just have seen it 2 or 3 times for some 400 renders), and don't know when it starts (pass #) because I allow the render to process all night long (big images, 5000x4000).

ID, wirecolor, sourcecolor, reflection, all render as usual, as they take only 5 passes. In scene, no funny things: correct lighting and materials, no black objects... just render turning black slowly.

I use a xeon e2650, 64gb RAM, and nvidia 1050. Video drivers in 3Dmax cannot be the issue, as all displays fine.

Any ideas?