2017-02-25 Analytical Calculation of the Solid Angle Subtended by an Arbitrarily Positioned Ellipsoid to a Point Source by Eric Heitz via @robertcupisz MATH https://labs.unity.com/article/analytical-calculation-solid-angle-subtended-arbitrarily-positioned-ellipsoid-point-source pdf : https://hal.archives-ouvertes.fr/hal-01402302v3/document 楕円体のオクルージョンの解析解についての資料です.