VrayBumpMtl with VrayDirt as bump shows object triangulation.

V-Ray V-Ray for Maya Issues
1

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.

vrayBumpMtl_problem_1.jpg
vrayBumpMtl_problem_1.jpg982×642 43.8 KB

vrayBumpMtl_problem_2.jpg
vrayBumpMtl_problem_2.jpg800×423 84 KB

2

anyone have any advice?

3

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

4

Here ya go. Thanks for taking a look.
vray_dirt_4.zip (21.2 KB)

5

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

maya_2016-10-26_19-00-41.jpg
maya_2016-10-26_19-00-41.jpg875×572 58.4 KB

6

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.

VraybumpMtl_problem.jpg
VraybumpMtl_problem.jpg960×540 27.6 KB

7

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.

8

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.

9

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

10

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

11

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?

maya_2016-10-28_16-09-02.jpg
maya_2016-10-28_16-09-02.jpg927×539 96.6 KB

12

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.

remapValue_ramp_bug.jpg
remapValue_ramp_bug.jpg437×250 21.5 KB

13

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.

14

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.