Adds a listener to an event type.
The type of event to listen to.
The function that gets called when the event is fired.
附加变换控制器
取消选中物体
分离变换控制器
Fire an event type.
The event that gets fired.
Checks if listener is added to an event type.
The type of event to listen to.
The function that gets called when the event is fired.
判断物体是否被选中
Removes a listener from an event type.
The type of the listener that gets removed.
The listener function that gets removed.
选中物体
物体选择器,将场景中的某个物体或单体标记为选中状态
该类会随Engine的初始化自动实例化,不需要开发者手动执行初始化,通过
engine.selection访问示例