Vray 3.4 glass appear black

[inbelet]

Hi,
one of my students is using vray 3.4 with sketchup 17- every material is good except the glass or the other translucent materials (like water) :
they all appear black!

any suggestions?

[matthewg]

Was a similar problem posted in the public forums

here was Konstantins response:

https://forums.chaosgroup.com/forum/...is-black-in-su

Hi matthewg,

The reason why your material renders black is its Fog Color.
The fog color is based on the color specified and the thickness of the object in the scene (the further the ray travels in the volume the darker color you'll see).
If your glass object has no thickness (is a single-sided surface) the fog density reaches infinity and leads to the dark shade that you see.
Simply adding a thickness to the face should resolve that.
If on the other hand you have to use single-sided surfaces (for windows let's say) you can create a Fake_Glass... from the Diagrammatic library category.

To have full control you can do the following from scratch:
> Black 'Diffuse' color
> White/Bright 'Reflection Color'
> 'Reflection IOR' on and equals 1.6 (or whatever you need)
> 'Refraction Color' set to a bright color for the tint
> 'Fog Color' - white
> 'IOR' set to 1
> 'Affect Shadows' on

You can also check out the material attached.

Regards,
Konstantin

I have attached his material aswell