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Lukas Stockner 8dea06565f Cycles: Add Blackman-Harris filter, fix Gaussian filter ...

This commit adds the Blackman-Harris windows function as a pixel filter to Cycles. On some cases, such as wireframes or high-frequency textures,
Blackman-Harris can give subtle but noticable improvements over the Gaussian window.
Also, the gaussian window was truncated too early, which degraded quality a bit, therefore the evaluation region is now three times as wide.
To avoid artifacts caused by the wider curve, the filter table size is increased to 1024.

Reviewers: #cycles

Differential Revision: https://developer.blender.org/D1453

2015-11-18 20:50:06 +01:00

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