Optical Paths for Shading Model

P

I

sun

cloud

skylight

q

atmosphere

l

l

a

P

1

P

2

earth

optical paths for shading of cloud/snow

atmosphere

Ｐａ

Ｐ１

Ｐ２

Ｐ

Ｐｖ

viewpoint

cloud/snow

sky light

sunlight

light arrived at P

• direct sunlight

• sky light

• multiple scattered light

• reflected light from object

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