全景圖研究-相關參考鏈接

https://stackoverflow.com/questions/2656899/mapping-a-sphere-to-a-cube/#
http://paulbourke.net/geometry/transformationprojection/
http://paulbourke.net/miscellaneous/cubemaps/
https://blog.csdn.net/juebai123/article/details/79475937 基於修改lookat生成
https://github.com/Tomius/ReLoEd/blob/master/src/glsl/engine/cube2sphere.glsl 
https://github.com/wwtalwtaw/learnopengl/blob/master/cube.vs