| 单词 | Shadow |
| 释义 | ShadowThe Surface corresponding to the region of obscuration when a solid is illuminated from a point light source(located at the Radiant Point). A Disk is the Shadow of a Sphere on a Planeperpendicular to the Sphere-Radiant Point line. If the Plane is tilted, the shadow can be theinterior of an Ellipse or a Parabola. See also Projective Geometry |
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