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center specifies the 3-D coordinate at the center of a sensed region.
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size field defines the dimensions of a sensor's box-shaped region a width, a height, and a depth measured along the X, Y, and Z axes of the current coordinate system.
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isActive eventOut flags whether any part of sensed region is consrained within the viewing-volume frustrum.
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enabled field enables and disables the VisibilitySensor.
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enterTime event is generated whenever the isActive TRUE event is generated.
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exitTime events are generated whenever isActive FALSE events are generated.
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