@techreport{heitz:hal-01402302,
  TITLE = {{Analytical calculation of the solid angle subtended by an arbitrarily positioned ellipsoid}},
  AUTHOR = {Heitz, Eric},
  URL = {https://hal.science/hal-01402302},
  TYPE = {Research Report},
  INSTITUTION = {{Unity Technologies}},
  YEAR = {2016},
  MONTH = Nov,
  KEYWORDS = {solid angle ;  ellipsoid},
  PDF = {https://hal.science/hal-01402302v1/file/solidAngleEllipsoid.pdf},
  HAL_ID = {hal-01402302},
  HAL_VERSION = {v1},
}