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Fixed incorrect ray to disk projection prior to Shirley-Chiu mapping in ray2bin…

Authored by U No Hoo <roland.schregle@gmail.com> on Feb 2 2022, 03:11.

Description

Fixed incorrect ray to disk projection prior to Shirley-Chiu mapping in ray2bin(). This resulted in a spurious falloff in the corners. Apparently I assumed the ray should be mapped to the disk using an equiangular fisheye mapping. This was clearly wrong.

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