周末动手做了几个投影转换,实现了 Sphere / Fisheye / Stereographic / Stereographic Fisheye 投影转换:
Sphere投影:

Fisheye投影(fullframe):

Stereographic投影(北极视点,视角约72度):



Stereographic鱼眼投影Preview(北极视点):

参考资料:
https://wiki.panotools.org/Fisheye_Projection
http://hugin.sourceforge.net/docs/manual/Stereographic_Projection.html
https://wiki.panotools.org/Unusual_remappings#Little_planet
https://en.wikipedia.org/wiki/Stereographic_projection
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