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test/intern
Sergey Sharybin bc411ec06e Cycles: Implement an area preserving parameterization sampling for area lamps
Replace old code for area lamps which was more like incorrect with more correct
one using the following paper as a reference:

  Carlos Urena et al.
  An Area-Preserving Parametrization for Spherical Rectangles.
  https://www.solidangle.com/research/egsr2013_spherical_rectangle.pdf

Implementation is straight from the paper, currently the rectangle constants are
calculated for each of the samples. Ideally we need to pre-calculate them.

Some comparison images are available there

  http://wiki.blender.org/index.php/Dev:Ref/Release_Notes/2.73/Cycles

Reviewers: brecht, juicyfruit

Subscribers: dingto, ton

Differential Revision: https://developer.blender.org/D823
2014-10-16 14:40:29 +02:00
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2014-07-01 09:36:28 +10:00
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