Glass with wrong refraction

[Blum-Architekten]

we have a problem with glass material (specular metarial). Although the geometry is only 1cm thick, it is rendered, as if the pane was perhaps a meter thick. Even if I set the refraction to 1.0, a strong refraction is calculated.

Installed is Rhino 7 SR 16
Octane Studio driver 2012.1.3.131
Graficcard RTX 2080 Ti
Driver Nvidia 512.15 studio driver

I would be very grateful for a quick help!

[face_off]

Hi - I recall I answered this issue elsewhere? It looks like it could be a Kernel->Ray Epsilon issue.

Paul