This is important, since the number of particles
hitting any particular area of the sky may vary dramatically depending
on the complexity of the underlying surfaces. We must ensure that
a large concentration of flakes (say, directly above a tree), draws the
same total snow as would the sky above a sparse flat surface. Furthermore,
importance ordering implies that not all launch sites shoot the same number
of particles. Our approach allows to easily manipulate the amount
of snow the sky produces, allowing us to "draw" on complex, curved objects
using snow. |
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