1. An object management system comprising: a model manager that creates an avatar representing a human operator; places the avatar in a three-dimensional environment with a model of an object; displays the three-dimensional environment with the model of the object and the avatar from a viewpoint relative to the avatar on a display system; identifies an interaction between the avatar and the model of the object in real time using information about motions of the human operator detected in real time from a motion capture system, wherein the interaction changes a group of dimensions in the model of the object; and displays the interaction between the avatar and the model of the object in the three-dimensional environment on the display system, enabling design changes in the model of the object made by the human operator.