VrayMtl - Double-sided material display as one sided in viewport (triggered by IPR).

[markus_s_cg]

Hi!

I have a problem with Vray materials in the viewport. It starts out fine displaying as 2-sided (both sides shaded in viewport). But when I start rendering (IPR in Vray framebuffer) all Vray materials starts showing as "1-sided" in the viewport (with black backfacing). This is annoying since it makes it hard to see. In order to fix it, I must go into the material editor and toggle any setting for each material so it refreshes the display in the viewport, and display 2-sided again

Max 2018.4
Vray 3.60.04

[markus_s_cg]

Hi again. I posted about this issue in the Autodesk forums as well, since I'm not sure if it is a 3dsmax issue or Vray issue, but it seems to be triggered by Vray IPR and only affects Vray materials (afaik).

Here's the Autodesk forum post. Maybe the devs can take a look?
https://forums.autodesk.com/t5/3ds-m...644630#M152222

I've created a screencast recording to show how it is triggered:
http://autode.sk/2A5YX7F