What he introduced included oval projection, stereographic projection, analemma and scenography etc.
关于投影几何，
带来的有椭圆投影、
投影、
行正投影和透视法
。
体画法的,体照相的面投影；
体投影；面投影；射赤面投影What he introduced included oval projection, stereographic projection, analemma and scenography etc.
关于投影几何，带来的有椭圆投影、投影、行正投影和透视法。
Stereographic projection is known since the antiquity and was originally known as the planisphere projection.
体绘图法原称为星座盘投影法。
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