VRTK_ControllerEvents感知手柄事件的
VRTK_UIPointer这个脚本作用两个:
1 disable existing standalone input module and add the custom event system
2 disable existing graphic raycaster and add the custom raycaster
3 add a box collider and background image to ensure the rays always hit
pointer Toggle Button 是个枚举变量,可以手动再添加一个None ,然后pointer pressed勾选
pointer visibility 表示激光线一直显示
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