a thought on shadows

[VO101_Tom]

Originally Posted by raaaid

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if they half cover the sun they give half shadow
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I think, it's not the direct radiation, but because of the diffuse sky radiation. Is the same reason of the shade's blurring edge, and the same reason, why is not completely darkness in the shade (like in space), and so on.

In cod, the airplanes have a shade, but its edge blurred very much from high altitude. Like here, for example.