Interior glass reflects exterior as black instead hdr sky

[Brandon Eckhart]

I'm rendering an interior scene and I can't get the interior glass to render the hdr sky I have outside.  I know it has to be a setting somewhere, but for the life of me, I can't find it.

I'd be happy to provide any of my render settings.  I'm just not sure which ones are relevant to the problem and don't want to provide a bunch of useless info.  Any help is greatly appreciated

thanks!

Brandon

[Roy Hirshkowitz]

Check to see that the reflected and refracted background are the same-- both in type and intensity.  It's possible that the glass with blurry reflection can only reflect "lighting" settings-- can't quite remember.  You may need to find another way to model this glass (or actually light with the daylighting you see in the windows.)  Since this rendering is departing from a true simulation (you're rendering a night scene with day outside the windows), it can be somewhat tricky.  If you want to send the model I'd be happy to take a look.  Use the upload link above under the Support menu. 

[Brandon Eckhart]

I made sure they're both identical; no luck.  My normal course of action would be to just fix this in post, but I was just curious if it was something as simple as increasing the reflected/refracted bounces or some other setting I'm missing.  So far, nothing I change affects it.

Thanks for checking this out.

[Roy Hirshkowitz]

It might be-- I'll take a look at it today or this weekend.

[Brandon Eckhart]

I've even tried changing visible, reflected, and refracted backgrounds to just solid color white while bumping the bounces up to 100 each and it still only reflects black.

[Roy Hirshkowitz]

As suspected-- the Hybrid engine doesn't allow you to set separate background channels (except visible).  I may relax that requirement at some point but it's not trivial to implement.  You could change to the Path Tracer or try a more rigorous interior daylight simulation (or use post as suggested).  The image below used the Interior Daylight preset-- I turned the sun and sky down to 0.5 before starting and then put things on separate channels.  With the sky channel set to 0.2 I got this in about 45 minutes:

[Brandon Eckhart]

Aha, thanks for the help.

[akinlolu olugboji]

Interior Lighting preset, separate Sun and Sky channels,with HDRi for sky resulted in this after 10 passes. Standard Engine.