Importance

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Abstract

An apparatus and method for rotating a perspective view of a three-dimensional object image displayed on a display screen from an original view point to a desired view point, and for moving the perspective view in a parallel manner from the original view point to the desired view point. When the perspective view is rotated, a circle is generated that has a first point corresponding to the desired view point. A line segment is generated from the first point to the center of the circle. A hemisphere is generated that has a top surface, a vertex, and the circle as a bottom surface. A second point on the top surface represents the first point projected to the top surface. The desired view point is a projection from the second point to the bottom surface of the hemisphere and the original view point is a projection from the vertex of the hemisphere. The perspective view displayed on the display screen is then changed to the desired view point. When the perspective view is moved in a parallel manner, a boundary is generated which represents a displayable range of the three-dimensional object image on the display screen. A line segment is generated from the current cursor position to the center of the boundary. The displayed perspective view is changed by moving the perspective view along the line segment by a distance equal to the length of the line segment.

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First Claim