RT displacement artifact

[Nearl]

I was testing some fabric displacements in RT and noticed an issue in the displacement on the seat cushions (attached). I tried adjusting a few things but nothing removed it. When I switched to Advanced, it was gone. Any ideas what is causing this in RT? Just curious if I'm overlooking something. Thanks!

[tashko.zashev]

Hi Neal,

The RT displacement looks wrong indeed and I would like to ask you to send us that scene for a further investigation. You can use our support mail (support@chaosgroup.com).

[Nearl]

I sent over the scene. Let me know what you find out. Thanks!

[tashko.zashev]

Thanks!

The displacement issue is reproducible, but before sending the bug report to our devs I would like to ask about the Software version you are using? The scene is saved with Max 2018 but according to the signature 2016.
Is it possible that you are using the latest V-Ray 3.60.03 ?

I found that the issue has something to do with the View-dependent option of the Displacement modifier. Can you try to turn it Off and lower the Edge length to 0.05 which should give you the same quality?

[Nearl]

Sorry about that, I've updated my signature.

Yes, switching View-dependent off and lowering the Edge length fixed the issue. Thanks for your help!

[tashko.zashev]

That's great, then you can use this approach as a workaround until we fix this bug with our RT/GPU renderer. Thanks again for providing all the information requested!