Color of Water Surface
I
N
bottom of the sea
viewpoint
normal vector
ji
ii
io
jo
n1
n2
sunlight
sea level
P
S
z
pq
I
i
q
q
q
q
d
: irradiance of sunlight; : refractive index of water
: attenuation coefficient; :volume scattering function
: fraction of scattering coefficient in a forward direction
: albed of water
I
i
n
b
F
w
0
c
I
P
Q
(
q
i
i
,
q
i
o
,
z
)
=
I
i
(
l
)
T
i
(
q
i
i
,
q
i
o
)
T
o
(
q
j
i
,
q
j
o
)
b
(
s
,
l
)
n
2
(
c
o
s
q
i
o
+
c
o
s
q
j
i
)
c
(
l
)
[
1
?
w
o
(
l
)
F
(
l
)
]
´
(
1
?
e
x
p
(
?
z
c
(
l
)
[
1
?
w
o
(
l
)
F
(
l
)
]
(
s
e
c
q
j
i
+
s
e
c
q
i
o
)
)
)
Light intensity transmitted in water
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