Crown illumination values ranged from 1, which indicated low light, and 6, which indicated that the tree crown was completely exposed.
2.
Given that the sun is about 0.5 degrees diameter, this basically needs to be a color and illumination value for the sun ( per tiny unit view cone ) and a simple phi, theta representation ( or spherical harmonics ) of the color and illumination of the sky ( excluding the sun, per unit cone ).
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