Why the box in shadow?

It’s doing shadow acne because we are doing visibility=1-e^(-c*(z-d)) with e^(-c*(z-d)) being clamped to 1 if it goes over 1, which is what is happening when d > z because -c*(z-d) is a big positive number. So, in that case 1-e^(-c*(z-d))=0 => shadow acne.

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