Reflection visible in Raw Refraction Elements

[dj_buckley]

I seem to be getting some reflection in my RawComponent Refraction elements?  Would this be a material problem? Geometry problem or is it normal behaviour?

As far as I'm aware, the windows are just thin boxes? With a pretty standard glass material on.  It's an exterior shot - don't want to cancel the render to check it.

[PROH]

Hi. If you're using boxes as Windows, then it's probably the reflections from the inner layer seen through the refracted outer layer, and therefore visible in the refraction element. If that's the problem, then use a plane as window instead (or delete the inner glass).

Hope it helps

[dj_buckley]

How do you get those double/triple/quadruple reflections that you get with double glazed/triple glazed glass if you can’t use boxes?

[PROH]

You don't... I'm not saying you can't use boxes, I'm only saying that it might be the reasons for your refraction/reflection issue :)

Best Regards

[ramyhanna]

I can confirm this is an issue with Corona 9.  If you are using a box, raw refraction will show reflection.  This is not how raw refraction layer worked in vray, at least in vray 4.  It would be nice to still use thickness for glass, but get a raw refraction without internal reflections.  Any idea now to achieve this without changing the IOR to 1.0?

Thanks,
Ramy