topic Re: URGENT - Glass rendering black in 3ds Max Forum

URGENT - Glass rendering black

Anonymous — Sat, 22 Sep 2012 11:06:14 GMT

Hello,

I'm in a bit of a tricky spot. I sent off a huge project to a render farm last night, and I've just realised the glass in the scene is rendering black, when there is no geometry behind it.

I've attached an example of the problem.

Can anyone help me out with this? The project is going to DVD on Tuesday and the render farm is waiting for me to fix the problem! :S Waa.

Rendering with V-Ray.

Any help much appreciated.

Thanks

glassproblem.zip

Re: URGENT - Glass rendering black

Anonymous — Sat, 22 Sep 2012 11:21:08 GMT

Sorted!! Both vray and standard environment settings need to be the same. (in my case white)

Re: URGENT - Glass rendering black

JezEmin — Sun, 23 Oct 2016 09:45:02 GMT

Thanks so much for answering your own question - many times people solve their own problems but then don't share how they did it.

Me, I've been having this same issue myself and thanks to you I solved it too 🙂

Many thanks, once again.

Re: URGENT - Glass rendering black

Alfred.DeFlaminis — Mon, 24 Oct 2016 20:11:01 GMT

The reason this is happening is that the environment is being refracted in the glass and since the environment is black, the refractions of that environment are black. Changing the color to white won't fix your alphas but it will hide the black. The problem will reappear however if you attempt to lay someone underneath it in comp.

Fortunately the Vray materials have a method for dealing with this built into the refraction settings, shown below. However it'll still refract the environment color where it overlaps (e.g. the edges of the glass) I've attached test.png which has my environment color set to green with Affect Alpha on. You can see this is a bit more comp friendly.

Edit: Used a different image.

Best Regards,