Error writing render region to raw image file.

[tinuz]

I'm getting this error once i a while and I'm wondering what can cause this.
at first I thought it was a DR hosts that accidently was put on sleep and never got o send his bucket back but In my lasts render there was no report of not responding hosts.
so what else can cause this?
and why I get this error after the image has been written successfully?

FYI:
i'm using multichannel EXR's..

[2010/Oct/20|11:41:31] V-Ray debug:
[2010/Oct/20|11:41:31] V-Ray: Successfully written image file "/Volumes/projects/_3dRenderfiles/UncInc/3DRenders/ComputerA_V04/ComputerA_V04.0001.exr"
[2010/Oct/20|11:41:31] V-Ray debug: Waiting for DR to finish
[2010/Oct/20|11:41:31] V-Ray: Number of raycasts: 124651316
[2010/Oct/20|11:41:31] V-Ray: Camera rays: 26090142
[2010/Oct/20|11:41:31] V-Ray: Shadow rays: 55156863
[2010/Oct/20|11:41:31] V-Ray: GI rays: 1961310
[2010/Oct/20|11:41:31] V-Ray: Reflection rays: 16350426
[2010/Oct/20|11:41:31] V-Ray: Refraction rays: 0
[2010/Oct/20|11:41:31] V-Ray: Unshaded rays: 25247695
[2010/Oct/20|11:41:31] V-Ray debug: Clearing global light manager.
[2010/Oct/20|11:41:31] V-Ray debug: Clearing direct light manager.
[2010/Oct/20|11:41:31] V-Ray debug: Clearing ray server.
[2010/Oct/20|11:41:31] V-Ray error: [SetRegion] Error writing render region to raw image file.
Error: [SetRegion] Error writing render region to raw image file.

[instinct]

This usually means that either there is no space left, or that the file is locked and cannot be written to.

Regards,
Thorsten

[tinuz]

hmm.. ok
well can't be space since we have 350 gig left

about the locking, vray writes out the exr file, and so can only be responsible for the locking, am I right?
but then vray prevents itself from writing to the file??
so is there maybe a lag in in unlocking it before writing to it?
am I making sense here? :P

[vlado]

I know of similar issues with the OpenEXR library when writing to a network location; I'm not sure what causes the bug exactly. Writing to a .vrimg file is more stable.

Best regards,
Vlado

[tinuz]

that sounds it could be it, because sometimes I can't read exr from the network but when I copy these to a local disk they're ok..
and erros with zlib compression or something like that, can't recall exactly
that is too bad, because I do like the exr workflow.. but I'll try vrimg instead.

thnx vlado

[ultrasonic]

Because of this issue we render our EXRs to a local dir and then convert them from tile-based to scanline and after all that we copy them to the correct server directory.Needs some scripting,but it works! It's just not funny to have an image render 5 hours and then see this error....

[tinuz]

Indeed.. had this a couple of times already..not fun

I was just making a local Render dir to set that up, vrimg was 640 mb instead of 25 for the exr.. bit to much for my taste..

so I did some googlemagic on converting from tile to scanline.. I found the python script for nuke, but for now I'll stick with manual converting in nuke..
one question though.. in maya under OpenEXR options you can set the compression type to scanline ZIP... does this convert it also to scanline (noob in this area )

I would be interested in your scripting solution if at all possible to share... if not no worries..

thnx for he quick responses guys!

[vlado]

I was just making a local Render dir to set that up, vrimg was 640 mb instead of 25 for the exr.. bit to much for my taste..

That's odd as .vrimg files now include compression as well. Which V-Ray build are you using?

in maya under OpenEXR options you can set the compression type to scanline ZIP... does this convert it also to scanline (noob in this area )

No, it just means the data will be compressed in scanlines within each tile.

Best regards,
Vlado

[tinuz]

I'm using:
V-Ray for Maya version 1.50.SP1 from Jun 11 2010, 17:05:34
V-Ray core version is 1.90.03

I can't find any compression options for vrimg in maya.

[vlado]

Hm ok, that was added afterwards and will go into the next update.

Best regards,
Vlado