指定啟用陰影時(shí)，對(duì)象是從每個(gè)光源投射還是接收陰影。
Members
(static, constant) CAST_ONLY : Number
對(duì)象只投射陰影。
(static, constant) DISABLED : Number
對(duì)象不投射或接收陰影。
(static, constant) ENABLED : Number
對(duì)象投射和接收陰影。
(static, constant) RECEIVE_ONLY : Number
對(duì)象只接收陰影。