用CAD画三维?等于坐拖拉机去巴黎,醒醒,去网上瞧瞧什么叫三维
看看这些实例
http://hi.baidu.com/d%5Fzzn0470/blog/item/505d6d5114c1f1878c5430b4.html
http://hi.baidu.com/d%5Fzzn0470/blog/item/6e5a3e03b6b29280d53f7cc3.html
http://hi.baidu.com/d%5Fzzn0470/blog/item/1ae281a9d7378af41e17a2a6.html
http://hi.baidu.com/d%5Fzzn0470/blog/item/aee8baf0b9daebcb7831aaf9.html