Refraction difference between CPU & GPU

[Bpositive]

I have stumbled upon this strange difference between rendering on the CPU and the GPU. - The refraction looks totally different.

The right image is rendered with normal vray and the left is rendered with RT GPU - can anybody explain that!?

I have tried changing a lot of parameters in both the materials and the render setting, but no difference.


My goal is to have the GPU rendered look in my production render.

[Svetlozar Draganov]

Hello,

I am trying to reproduce this issue - but probably my scene is too simple and the GPU and CPU renderings looks identical.
Is it possible to attach this scene ?

Thank you very much in advance.

[Bpositive]

Thanks, I have cleaned up the scene and you can download it from here: bpositive.dk/BackupDIV/Bpositive_Refraction_Issue.max

[Svetlozar Draganov]

Hello,

The problem is not in the material but in the geometry.
You have a geometry without volume - calculating refraction of geometries without volume is not correct, that's why Production render gave you wrong result.
A "shell" modifier can be used to add a quickly thickness - in my example I used Inner Amount of 0.005cm.
This is what I got with this simple change - please keep in mind that every object in your scene without volume can cause troubles like light leaks , wrong reflection and refraction and etc.