Rear Object Renders Dark/Opaque When Behind Double Transparent Layers (Glass + Polycarbonate)

[dhwlals45]

I have a problem with my polycarbonate material rendering differently based on its location:

Behind Glass (Curtain Wall): The polycarbonate sheets located behind the outer glass layer render as dark, opaque, or very dark transparent.

Exposed Exterior: The polycarbonate mass that is fully exposed to the exterior (no glass in front) renders correctly

I have already tried adjusting the reflection (specular/glossiness) and transparency (opacity) values for the glass material.

[ela]

Hi @dhwlals45

Thanks for the details. To better understand the issue with your polycarbonate material rendering differently, could you please upload a screenshot showing how it looks in both cases (behind glass and fully exposed)? This will help us pinpoint whether it’s a material setup, lighting, or render interaction problem.

[dhwlals45]

The masses on the left side of the picture have been implemented with polycarbonate, but the masses behind the curtain wall on the right side of the picture have not been implemented. The glass has been assigned standard glass settings.