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Strange bright lines in big renders
Posted: Mon Mar 08, 2010 12:52 pm
by Pixelprinz
Hello, I have some strange bright lines in some renderings:
http://www.pixelprinz.ch/docroot/pics/Burj.jpg
I got that problem since I did the v2.02 Update, but just in big renderings (this one is 2300 x 5744px).
Short after starting the render you see the normal noise, but not these white lines.
As I took a look next morning it was messed up. I am not sure, but I think it happens in the stopping process,
but only in renders that run some hours...
I use: Maya 2010, Maxwell Render V2.02, Mac Pro 2 x 3.2 GHz Quad-Core Intel Xeon, 16 GB Ram, OSX 10.5.8
Do anyone have the same problem with 2.02?
Regards, Linus
Re: Strange bright lines in big renders
Posted: Mon Mar 08, 2010 2:11 pm
by tom
Could you please send me the scene (MXS)?
Re: Strange bright lines in big renders
Posted: Mon Mar 08, 2010 2:34 pm
by JorisMX
This is what happens when the flash isnt in sync with the filmgate

Re: Strange bright lines in big renders
Posted: Mon Mar 08, 2010 6:17 pm
by Bubbaloo
I can confirm this. It happened to me on a 5000 px render over the weekend. But I'm not sure it happens at the stopping process. It was a network render on 2 computers (similar specs). One render worked fine, one had this white line. But it looked like from the individual render times shown that the error occured several hours before I stopped the render. The mxi's did not merge and write to disk, so I had to go retrieve them from the temp folders. When I merged them, I noticed the white line. When this error occurs, the render progress stops. I also looked in the manager and node consoles for errors (debug mode), but did not see any.
Re: Strange bright lines in big renders
Posted: Mon Mar 08, 2010 6:24 pm
by tom
Thanks for the scene. We're trying to reproduce the issue without success so far.
Re: Strange bright lines in big renders
Posted: Mon Mar 08, 2010 6:27 pm
by Bubbaloo
I think it's going to be a tough one to reproduce... My error occurred at 44 hours render time...
Re: Strange bright lines in big renders
Posted: Mon Mar 08, 2010 7:25 pm
by Pixelprinz
Great, thank you all for the help! I will retry the rendering tonight and I will let you know what happens tomorrow morning...
Re: Strange bright lines in big renders
Posted: Mon Mar 08, 2010 7:44 pm
by nachob
Hi Pixelprinz, we are still evaluating where this bug comes from, but could you try opening the mxi and re-saving channels and output in a 32 bit format, like TIFF or EXR to check if the problem is in the mxi or in the output process?
Thanks
nachob
Re: Strange bright lines in big renders
Posted: Mon Mar 08, 2010 7:59 pm
by Pixelprinz
Hi Nachob, I tested it and it is still messed up, also in the 32bit .HDR...
http://www.pixelprinz.ch/docroot/pics/B ... op.hdr.zip
I can zip the MXI and load it to my FTP, if it helps. That would be 411MB...
Thanks and greetings, Linus
Re: Strange bright lines in big renders
Posted: Tue Mar 09, 2010 11:23 am
by Pixelprinz
Last night I did a big render again and now I can say, It happens definitely in the stopping process! The render was 2300x5744px again, no multilight, with Material and Object ID. With SL 12.49 it looked good and as I stopped it, the white lines appear. And even after 45 minutes it could not finish to write the Output! It just stays like that:
http://www.pixelprinz.ch/docroot/pics/S ... t_Burj.jpg
Re: Strange bright lines in big renders
Posted: Tue Mar 09, 2010 11:41 am
by EADC
Have it too, going fine untill actually stopping the render.

No big res render, just 1600*1200. Tried to change multilight sliders and notice that the preview changes but the white stripes remain. Cannot refresh as the button does not respond.
Used the 64bit patch.

Re: Strange bright lines in big renders
Posted: Tue Mar 09, 2010 12:09 pm
by nachob
Hi EADC,
Were you rendering extra channels also?, if so, which channels?
Thanks,
nachob
Re: Strange bright lines in big renders
Posted: Tue Mar 09, 2010 12:19 pm
by EADC
Opening the mxi is possible even if the process of writing output holds on 10%. The opened mxi does allow refreshing, but the stripes remain. Used Ibl and two ibl emitters (behind ags) for the displays.
No extra channels used.
Eric.
Re: Strange bright lines in big renders
Posted: Tue Mar 09, 2010 3:00 pm
by zdeno
It looks like there is something wrong with access to RAM . it looks like bad merged .MXI with cooperative render, but this is weird it appears with NO MULTILIGHT too.
Re: Strange bright lines in big renders
Posted: Tue Mar 09, 2010 4:47 pm
by micheloupatrick
I had a a similar problem on a 20 minutes render on a Mac Pro with MR 2.0.2, initiated from Maya 2010. Mac OS 10.6.2. Single machine rendering.
Everything looked fine while rendering, but when I clicked the stop button (around SL16), a bright square appeared on the image and the "output written" progress bar never reached 100%.
Unfortunately I didn't keep the file...