away3d camera note

away3d camera note
camera 相關原理可以先參考這兩篇
http://www.flashmagazine.com/Tutorials/detail/away3d_basics_the_cameras/
http://blog.tartiflop.com/2008/08/understanding-zoom-focus-and-field-of-view-in-papervision3d/
away3d 有四種 camera，分別是
camera3D：default camera
TargetCamera3D：automatically look at a specified target object
SpringCam：1st and 3rd person camera
HoverCamera3D：hover round a specified target object

本文介紹(最常用) HoverCamera3D，
利用改變 camera.panAngle 及 camera.tileAngle
來產生旋轉及放大縮小的 3D 效果。