I use vray 1.5 sp5 in 3ds max to render a vray glass and environment map with vray physical camera. But the Vraysky behind the glass is dark. With 3ds Max standard glass material and Vray physical camera, with normal camera and 3ds max standard material or with Vray glass material and normal camera there is no problem. I post some more pictures and settings with it. How to solve this problem? Thanks! The glass has thickness and I use VraySun.
1. Vray physical camera with Vray glass material
settings
2.Vray physical camera with 3ds Max standard glass material, glass parameters: Blinn, specularLevel 125, Glossiness 40
3.3ds Max camera with 3ds Max standard glass material
4.3ds Max camera with Vray glass material