Issues with Rendered Glass Appearance (Revit 2017)

[ckeenum82]

I am having an issue with glass appearance in a scene I'm renderings with Revit 2017 that I have not experienced with previous versions of the software.

Within my interior scene, I have several light fixtures that use clear glass. When I render on a lower setting such as Medium 150 dpi, the glass appears clear as I would expect. However when I render on a higher setting such as High 300 dpi, the glass appears like a dark gray frosted material.

I cannot seem to resolve this and I am looking for any possible solutions. Please see attached images for reference. Thank you!

[GMcDowellJr]

I'm going to guess it has something to do with the number of refractions the rendering calculates. Medium has fewer (or none), high has more.

[ckeenum82]

In Revit 2014 I'd have hope to resolve this issue based on your reply. I recall that I could adjust reflection/refraction, however in 2017 - I don't have that capability as far as I know. I will continue to experiment. If I can find a solution, I will post. Thanks!

[GMcDowellJr]

Hmmm... that's new. Sorry then. I got nothing.

[cellersick]

Have you tried using an Appearance that is based off a Generic Appearance and manually configuring it to mimic glass? To me it's not readily apparent how the properties of the OOTB Glass appearance will affect the rendering.

[ckeenum82]

I haven't yet - but I'm going to try it because this is driving me nuts!