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The Windows are just simple faces with "architectural glass" from the Live DB. Outside is a vertical plane with that space foto on it. The repetition of the outside texture isn't natural .. I'm doing something wrong.

Found out it is the "Index" parameter of the glossy node ... but if I set that to 1, so the planet shows right, the result is the reflections of the lights are gone. How can I have a proper windows here? One that reflects the inside lights of the office, but doesn't do funky things with the outside planet image?

Try using the glass fake falloff material, it usually works for me

.. maybe you need closed geometry, not just a single plane for a window, octane assumes there is volume so you can get crap like this.. like you are inside of a cube

voon wrote:The Windows are just simple faces with "architectural glass" from the Live DB. Outside is a vertical plane with that space foto on it. The repetition of the outside texture isn't natural .. I'm doing something wrong.

There is a fake way of doing this which might suit your purposes.
Just use the plane as is, apply a glossy material with full reflection, index 1.00, no roughness (un-tick smooth as well). This will provide you with a mirror surface, then reduce the opacity until you get the right mix of reflection to transmission that you want. If you want some more realism you can control the opacity with a falloff map (more opacity, ie: less reflection on straight through viewing angles, and more reflection on grazing angles).

If you need to have an accurate glass material there with real IOR etc, then you need to model it as closed geometry (as acc24ex says!).

Thanks
Chris.