Patent ID: 7834893

Claim:
A control method for a mixed-reality presentation system that presents an observer with a mixed reality by superimposing a virtual object rendered according to a position and orientation of a viewpoint of the observer onto a physical space or onto a sensed image of physical space, the control method comprising: using a processor to perform: a measuring step of measuring the position and orientation of the viewpoint of the observer; a virtual object detection step of detecting one or more virtual objects included in a view volume based on the position and orientation of the viewpoint obtained in the measuring step; and an adding step of adding a manipulation virtual object to each virtual object, from among the one or more virtual objects to be rendered included in the view volume, that satisfies set display conditions, wherein the display conditions are set as ranges relating to a size of the one or more virtual objects occupying the view volume, a surface area of a projected image of the one or more virtual objects occupying a clipping plane, a number of pixels in the image of the one or more virtual objects, a number of polygons in the one or more virtual objects, a distance between the one or more virtual objects and the viewpoint of the observer, a movement velocity of the viewpoint of the observer and the one or more virtual objects, a range within a color space of the one or more virtual objects, and wherein the adding step determines whether the manipulation virtual object is to be added or not for each virtual object of the one or more virtual objects included in the view volume, and adds the manipulation virtual object to each of those virtual objects that satisfies the set display conditions.