Possibly Corrupt VRIMG in Vray 3.00.03

[olly]

Since moving to vray 3 we are periodically getting renders that we cannot open. A real stress when you have waited an hour for it to finish!

The only solution we have found so far is to re render it, which is far from ideal.

A bit more info about our process:

The renders are typically 4000 x 3000 and rendered with DR.
They contain about 20 elements such as vrayreflection, vraylightselects and multimattes.
We use ProEXR to open them in Photoshop.

On a possibly related note I have had a few vray 3 renders that complete successfully (through backburner) but when opened, 1 bucket is missing. Not the end of the world but a bit annoying when you need to clone stamp so many elements.

We also had a possibly related strange render today: 1 node was rendering black buckets that appear to have superpowers when viewed in Photoshop. The black buckets are always on top take a look in the attached PSD to see what I mean:

jimbos strange file.zip

We have been using this method for 5 years prior to vray 3 without ever seeing any of these issues, so vray seems the likely culprit.

Any ideas welcome, especially tricks for opening vrimg's that won't open!

Cheers,
Olly

[dans]

The "black" buckets in the Photoshop file have pixel values of negative infinity (32-bit color picker shows --2147483648 ). The result of all operations based on these pixels values (like blending layers) will again end up in a value of negative infinity or invalid numbers. That is why those pixels appear to float on top.

Daniel

[olly]

Hi Daniel,

Thanks for taking a look and the explanation - you learn something new everyday around here.

So what would cause vray to render pixels with such strange values, could it be embree related?

[Svetlozar Draganov]

Hello olly,

Thank you very much for your feedback.
This issue is very odd and it would be very difficult to troubleshoot without reproducing it into our environment.
Does the issue appears only when you perform rendering via backburner or the same thing happens with local-render or Vray DR?
Have you got Lens Effects activated?
What operating system you are using?
Where the vrimg files has been saved , on a network-location or locally?
Have you got any firewalls or anything else which could prevent slaves or workstation machine to write data to the vrimg-file?
Which bucket is missing, is it the last one?
When you are rendering with BackBurner did you also use Vray Distributed Rendering or each machine renders separate vrimg?
Did it happen on various scenes or it is related only to that one?
Any chance to send us vrimg-file for investigation?

[olly]

Hi Svetlozar,

Please find my answers in red below:

Does the issue appears only when you perform rendering via backburner or the same thing happens with local-render or Vray DR? Not sure, we rarely save local renders 99% are rendered and saved through backburner.
Have you got Lens Effects activated? No.
What operating system you are using? Windows 7
Where the vrimg files has been saved , on a network-location or locally? On a network file server.
Have you got any firewalls or anything else which could prevent slaves or workstation machine to write data to the vrimg-file? No.
Which bucket is missing, is it the last one? Not sure, it is difficult to tell if track mouse was turned on.
When you are rendering with BackBurner did you also use Vray Distributed Rendering or each machine renders separate vrimg? Yes we are using DR with Backburner.
Did it happen on various scenes or it is related only to that one? In general all of my answers above apply to all cases I have described - but we have only received the black buckets with super powers on one scene so far.
Any chance to send us vrimg-file for investigation? Absolutely. I can send them via wetransfer to support@chaosgroup.com quoting this post. I have three example files, 2 are 1GB each and the other is 200MB. Let me know if that is ok and I will start them uploading.

Hope you can find something out and report back!

Cheers,
Olly

[olly]

bump!

some text to get me over the mark

[tashko.zashev]

Hi Olly,

Absolutely. I can send them via wetransfer to support@chaosgroup.com quoting this post. I have three example files, 2 are 1GB each and the other is 200MB. Let me know if that is ok and I will start them uploading.

Could you please send us the file for further investigation? Please add as much details as possible about this issue when you prepare your support mail, so will try to replicate the issue in our environment using the same software versions.
Thanks.

[olly]

I am uploading the 3 vrimg's via wetransfer to support@chaosgroup.com with a link to this thread for reference.

The files were rendered using max design 2014 vray 3.00.03. We use photoshop cc and proexr 1.8 to open vrimgs. The buckets with superpowers were rendered by an i7 3930K overclocked to 4.2GHz with 32Gb ram.

Let me know if you need any more info...

I look forward to your results.

Cheers,
Olly

[tashko.zashev]

Thank you very much for sending us the file Olly.
Actually I have seen this issue before and it was related to X-ref scenes rendered with DR. Is it the same case?
If not, it will be better to send us your scene (or part of it that reproduces the issue) to run few tests in our environment.
Thank you again.

[olly]

Actually I have seen this issue before and it was related to X-ref scenes rendered with DR. Is it the same case?

Yes that file was rendered with some xrefs. So is there a solution?

Just so you know there are 2 more on their way for inspection but will be a few more hours - they are 1Gb each.

[tashko.zashev]

Yes that file was rendered with some xrefs. So is there a solution?

The workaround is to merge all X-Ref file to the main scene or there is another solution posted here:
http://forums.chaosgroup.com/showthr...th-xRefs-Black

Would it be possible to confirm that the "black" bucket is from the Slave machine, because this issue is already added in our bug tracker and will be fixed by our developers.
You can check the "DR bucket" render element right after the render completes.

Just so you know there are 2 more on their way for inspection but will be a few more hours - they are 1Gb each.

Ok, will check them too.

[olly]

Yes it was a slave - we use the don't use local host option.

[tashko.zashev]

Thank you for the update.

Actually I see few non-fully black buckets on one of the files you have send.
Do you use referenced Camera for those scenes ?
If yes, please try to merge the camera only and try a render again.

[olly]

Hi Tashko,

No these vrimgs were all rendered with a normal camera that exists in the scene.

Any other ideas?

[tashko.zashev]

Thank you.

Most probably this DR/Xref issue is the same as the one we have already reported, but we need the files in order to be sure for that.

If you decide to send them, please contact us via our support mail (support@chaosgroup.com) and we will provide you with FTP account to upload the files.
Also please include this thread as a note.