This point, and the global Cartesian coordinate system origin, define the line along which the object is viewed while looking toward the origin.

 
  • 這個(gè)點(diǎn),連同全局笛卡爾坐標原點(diǎn),定義了當我們朝向原點(diǎn)觀(guān)察時(shí),觀(guān)察的視線(xiàn)。
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