| 摘要 |
<p>A storage unit (201) stores an object, the shape, position, and direction of a planar body being neighbored by the object, and covering polygons disposed so as to cover the object, in a virtual space. Each of the covering polygons includes transparency information, which expresses a shade of the covered object such that a central portion is opaque and transparency gradually increases toward the outside. A selection unit (202) selects, from among the covering polygons corresponding to the object, a covering polygon that satisfies a predetermined condition such as the condition of contacting with the planar body or other conditions as a projection polygon. A generation unit (203) projects the virtual space to a two-dimensional plane in the order of the planar body, the projection polygon, and the object to draw a shade of the object on the planar body.</p> |
