An example method involves receiving, from at least one camera located in an environment, a plurality of images captured during a first time interval. The method also involves selecting one or more of the plurality of images having a movable platform supporting one or more objects. The method further involves generating a three-dimensional model of the movable platform supporting the one or more objects. The method yet further involves updating the three-dimensional model based on one or more images captured during a second time interval. The method still further involves presenting the three-dimensional model via a display of a user interface, and providing an option to view a history of the three-dimensional model such that the three-dimensional model remains in a fixed position on the display during a viewing of the history.