Detail of message

Online Judge

Problem Set

Authors

Online Contests

User

Web Board
Home Page
F.A.Qs
Statistical Charts

Current Contest
Past Contests
Scheduled Contests
Award Contest

我的感觉也是的……我还有一点不明白，树干高度有用么？

Posted by TN at 2005-08-09 10:47:06
In Reply To:圆台的影子是两个圆加公切线？？ Posted by:zhucheng at 2005-08-09 10:46:09

Followed by:

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

Post your reply here:

Home Page Go Back To top

All Rights Reserved 2003-2013 Ying Fuchen,Xu Pengcheng,Xie Di
Any problem, Please Contact Administrator