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I just wonder if anyone know how to fix this issue? When I render the Class Room Scene, the windows often shown up as black (or checker boxes)? Apparently the ray tracing part is not hitting anything at those regions?

However, when I look at the demo image from the website they have corrected those? Any ideas? enter image description here

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Ok, I figured it out. The black is actually Alpha. So the quickest way to fix it is to patch it up with white.

Also, I notice the final result used the composite feature! It was not enabled by default. And that's why it looked different.

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