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The
observed
brightness
of
a
Lambertian
surface
may
be
written
as
the
product
of
an
albedo
factor,
p,
and
the
cosine
of
the
incident
angle,
cos
i.
This
means
that
brightness
can
be
written
as
a
product
of
a
term
that
depends
on
the
material,
p,
and
a
term
that
depends
on
surface
direction,
which
in
turn
depends
on
f
and
g.
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