I think you should set the shader to masked rather than translucent. If that broken window is a different material and it shows through I think that indicates a sorting issue with translucency. if that does not solve it you can double check the face normals be setting the shader to two sided. if that looks correct then you…
deadlineproof, this looks good! Can you select multiple faces and use the "Apply to Face" button? Or does it only work face by face, or on the entire object. How is the script determining which faces to apply it to when doing it on an entire object? I can't imagine it being able to always chose the right ones on a more…