| 摘要 |
PROBLEM TO BE SOLVED: To precisely and speedily obtain a three-dimensional space coordinate by obtaining a coordinate point in a three-dimensional space corresponding to a select- indicated coordinate point on a two-dimensional video through the use of a vector obtained by inverse transformation of a transforming method at the time of transforming a three-dimensional space shape to a two dimensional video. SOLUTION: At the time of displaying three-dimensional objects B1 and B2 on a display device 3 and select-indicating a desired point A on the displayed two-dimensional video, the indicated point A select-indicated on the two-dimensional video is obtained as coordinate data to obtain a coordinate value on the three-dimensional objects corresponding to the indicated point. At the time, a three-dimensional vector passing through an index point A is first obtained from a view point E and next, an intersecion point between the three-dimensional vector and the three-dimensional object in the three-dimensional space is calculated to obtain the three-dimensional coordinate value of intersection points C1 to C4. After then, a desired processing is executed to the three-dimensional space by the obtained three-dimensional coordinate value. |
