In depth learning in Usable World Objects can be found in Motive Academy in this course.
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Usable Point Click Action — Configures an object to allow for a “point and shoot” type of mechanic, like a spray bottle or scanner.
User Touch Action — Action that fires when the User touches this object. Useful for buttons, other control surfaces.
User Click Action — Action that fires when the User points and clicks at this object with a controller.