Sergey Sharybin 6b91fb706d Cycles: Optimize derivatives calculation by using pre-calculated dx/dy
We've got pixel-wide world-space derivatives which we can use in the
perspective camera sampling. This allows to get rid of two calls to
transform_direction() function.

In theory we can save two transform_perspective() calls if we'll also
save pre-calculated camera-space dx/dy.
2016-03-12 15:01:20 +05:00
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