Height-basedOptical Depth

Nice solution, good for glFogCoord

?

?

?

? ?(t) dt =

?D ? ?(Y1) , ?Y ? 0

? 1 + ( ?D / ?Y )2 ?, ? ?(y) dy , ?Y ? 0

Y2

Y1

b

a

? ?(y) dy = ? ?(y) dy - ? ?(y) dy

Y2

Y1

Y2

-?

Y1

-?

This can be implemented as two 1D table lookups.

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