The toradex package contain control nodes for the shutter mechanism to be used for multiple Xtion sensors. The Xtion sensor uses the structured light approach. The structure map of dots is project on a scene using IR laser diode, the scene is then captured by IR camera and the shift in the dot pater is used for depth computation. The problem is that the two or more Xtion pointed on same scene will destroy the dot patter. The IR LCD shtters will block the IR light from one Xtion allowing the second Xtion camera to capture dot pattern without interference.
The shutters node controls switching of the shutters and outputs from the multiple Xtions.