Affect Alpha - Refraction

V-Ray V-Ray for 3ds Max Issues
1

Hello,
I came across an issue when trying to get a correct alpha channel for my render. When I check “affect all channels” in my VrayMtl in Refraction for wine glasses (or any object in front of another glass object), it doesn’t make a difference. The alpha stays the same (opacity 100%) and I can’t put a background photo while making postproduction. As if there was an issue when I put a glass in front of another glass. Because the one on the window is correct. Please see attached screenshots. I have Max 2026 and newest Vray v. 7.20 (5 August 2025)
​​

2

You haven’t attached any screenshots. Otherwise, maybe you need to increase the Max depth of the refractive material or increase the Max transparency levels (Render Setup > V-Ray > Global Switches).

3

Thanks, it did the job!