URGENT: Pixels with negative values in Specular Pass

[kosso_olli]

Hey guys,
I am in huge trouble right now. I rendered loads of images over the last days, and they all have negative values in the specular pass on certain layered materials with Triplanar mapping as blend mask.
The problem is that these Pixels are infinitely negative when I load them in Photoshop, so I can not paint or stamp them over. As soon as the specular pass is visible, the image is worthless. I am in huge huge trouble right now and I do not know where to start!
Scene file with stripped down part is sent, will post the ticket number here.

[kosso_olli]

The file was sent to support.
Your ticket number is: 146-181-789

3dsmax 2017, V-Ray 3.60.04

[Morbid Angel]

what if you clamp the triplanar before you apply it into the blend?

[kosso_olli]

Already tried that. Both in the standard ouput node, also in a color correct. It gets a little better, but it still happens in some areas.

[Morbid Angel]

Just for kicks does it happen with embree off? I can't seem to see any other reason other then something funky in the shader setup, but I did have issues with embree in certain times.

[kosso_olli]

Thanks Dmitry, I will try it with Embree off.
Anyway, it would be extremely helpful if someone from Chaos looks over the sent scene file. Yet even reply to this thread in any form.

[kosso_olli]

Chaos, you must be kidding me! It has been a day and no one responded?

[Svetlozar Draganov]

Chaos, you must be kidding me! It has been a day and no one responded?

Please be notified that our official Support response time is up to 2 business days and for issues related to the product usage that time might be even more.
If something is super urgent please give us a call and we'll try to prioritise your case higher in the list and to resolve it quickly otherwise it will be handled when its turn comes.
We're always doing our best but since we have lots of communication channels and they are almost always overloaded we can't reply on every thread and email right away.
Our clients are our most important asset and our company goals are entirely formed around the idea to serve the customer in the best possible way so we are definitely not trying to kidding anybody.

I'am looking into your case now and I'll respond and I'll get back to you as soon as possible.

[pjkw]

If painting over the problem areas is an option (but not possible because how photoshop is dealing with the negative values) you could clamp the image before painting, nuke can certainly do this, I bet there is free apps that can do it aswell.

[Svetlozar Draganov]

It looks like the issue is caused by the EdgeTex plugged into Bump Material applied to the object.
As for now you may try to modify it a bit in order to workaround the issue until we are looking into it.

[Svetlozar Draganov]

There is also something involved with the Triplanar texture plugged into Bump slot of the VRayMaterial.

[kosso_olli]

Svetlozar, thanks for taking a look at the file. I know that the problem is caused by the Triplanar texture in the bump slot. However, I see no reason for that. I already tried a lot of things, like clamping the black and white values of the textures. This minimizes the amount of dead pixels, but I can not get completely rid of them. I also tried inverting the textures in PS and disabling the invert checkbox, but to no avail.

[Svetlozar Draganov]

Case has been added as a bug into our bug-tracker, I'll keep you posted for any updates from our side.
As for now, an option to workaround the issue is to rework shading network to not use Triplanar textures for bump property of VRayMtl.

[Svetlozar Draganov]

If you can send me the original output .exr I may try to figure out a way to deal with those dead pixels at compositing stage.
Please send me also the composition where I can see how bad things are and how the actual composition works.

[kosso_olli]

I will send you a crop of the full resolution Photoshop file.