ET say's Hi.
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@mike-amos Thanks for sharing the scene. That helped me figure out the issue.
The glass windows in your scene are modelled as 100% transparant (opacity = 0%).

I'm getting technical here, but Rayscaper internally only allows for 8 transparent ray bounces. After 8 bounces, the ray terminates without contributing any light which results in the black windows. In your scene, there's a bit of bouncing around through multiple layers of glass, hence the black windows. In the next release, I will make the number of transparent bounces configurable as well so that you can bump it up to higher values if required.
Before

After

The fix will be available in the next release.
Cheers,
Thomas -
Thanks Thomas, appreciated.
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With your input, this post could be even better π
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