Here, and are the start and end points of the portion of the ray passing through the bounding volume, respectively. The function describes the density of the medium at a given point in space . Because not all functions have a closed-form solution for their integral, we often resort to numerical methods to evaluate it, i.e. moving along the ray in small steps and adding up the area of rectangular ‘slices’ of density along the way.
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。关于这个话题，heLLoword翻译官方下载提供了深入分析
Сайт Роскомнадзора атаковали18:00
Family weekly. College friends monthly. Work contacts quarterly. Different circles deserve different frequencies.。PDF资料对此有专业解读
«Радиостанция Судного дня» передала сообщения про неказистого жиротряса20:51
Most upland farmers still keep sheep on their land。电影是该领域的重要参考