VrayBumpMtl with VrayDirt as bump shows object triangulation.

[smbell]

I've got a VrayDirt going into a VrayBumpMtl and it shows lines where the objects render triangulation is. I found another thread with a similar problem, and my bump shadows attribute is off for my VrayMtl and my VrayBumpMtl. I've tried just about everything I can.

Reducing my network down to just the VrayDirt going into the VrayBumpMtl leads me to believe its an issue with one of those two nodes.

[smbell]

anyone have any advice?

[Svetlozar Draganov]

Would it be possible to attach the scene for investigation?
Thank you very much in advance.

[smbell]

Here ya go. Thanks for taking a look.

vray_dirt_4.zip

[Svetlozar Draganov]

What are the versions of V-Ray and Maya, the scene render differently here with Maya 2016 and V-Ray 3.40.04.

[smbell]

Maya 2017 with V-Ray 3.40.04

I attached a render of the scene as sent for comparision. The shader network is the same as the above attached image, I just messed with the settings for a bit before the file was sent, the issue remains in both images.

Thanks again.

[Svetlozar Draganov]

Should I mess with the Dirt or other nodes parameters in order to reproduce the issue?
I tried to modify Dirt parameters but still can't get similar result with the same V-Ray and Maya versions.

[smbell]

So you can render that exact image i posted above without the triangulation issue? I rendered that frame and saved the file to send you. weird


The issue happens any time I plug a vrayDirt into the bump slot of any shader, even a regular vrayMtl in addition to the vrayBumpMtl. Let me open the file here at work and check if it does it here.

[munchac]

It looks like my issue with bump shadow, same white line triangulation, but my problems was solved when im turning bump shadow off,
Maya 2016 with V-Ray 3.40.02

[smbell]

It looks like my issue with bump shadow, same white line triangulation, but my problems was solved when im turning bump shadow off,
Maya 2016 with V-Ray 3.40.02

yeah, I found your thread when I was searching for info. My bump shadow is off unfortunately.

[Svetlozar Draganov]

With or without the Bump Shadows option I cannot replicate that issue into our environment, the result looks like this:

Under what OS you are and what version.
Have you tried to reinstall V-Ray and see if the issue is still there?
Any change to run the same test on another Maya version like 2016 for example?

[smbell]

ok so, there is a fun bug in 2017 that deletes ramp points from the remapValue node on scene open or save, not sure... I figured it out when i opened the file at work.

Add a single black point to the far left of the remapValue ramp like so and you should get the identical render.

[smbell]

Were you able to reproduce the render after adding that ramp point back in?

I would love to make some nice chipped paint without baking out the dirt map first! Thanks for taking the time again.

[Zdravko.Keremidchiev]

Thank you for the update. We reproduced the issue and forwarded it to the developers for investigation (#VMAYA-5990).
As soon as we fix it we will let you know.