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圆台的影子是两个圆加公切线？？

Posted by zhucheng at 2005-08-09 10:46:09
In Reply To:就是说一棵树的影子应该是什么形状的？比如说Sample？ Posted by:TN at 2005-08-09 10:37:36

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我的感觉也是的……我还有一点不明白，树干高度有用么？ (0) TN 2005-08-09 10:47:06
- 好像没用，树高变大相当于投影面下移，而平行光投影跟投影面距离无关。 (0) zhucheng 2005-08-09 10:52:36
  - 可是如果树干高度为0呢？是不是影子面积会减少？ (0) TN 2005-08-09 10:59:25
    - 影子会在x,y方向分别移动一定距离，大小不变，因为影子的每个点只做平移。 (0) zhucheng 2005-08-09 11:07:59
      - 可是影子会被树挡住？ (0) TN 2005-08-09 11:11:23
        影子被树挡了，结果还是影子。影子就是光被挡形成的，影子怎么能被挡住而看不见？ (0) zhucheng 2005-08-09 11:14:50

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