| 摘要 |
PROBLEM TO BE SOLVED: To perform a processing accompanied with interference calculation with a free-form surface expressed by a higher-order curved surface expression or three-dimensional(3D) form composed of a large number of free-form surfaces by utilizing a polyhedron corresponding to simplified convex closure. SOLUTION: In a convex polyhedron calculating part 2, a convex polyhedron roughly expressing the size and position of a curved surface is found for each of a plurality of curved surfaces configuring a plurality of 3D forms and in a convex polyhedron interference deciding part 3, on the basis of each of found convex polyhedrons, the presence/absence of interference on the curved surface between the 3D forms is roughly decided. Concerning the curved surface, with which the possibility of interference is decided by that decision, in a convex closure calculating part 4, the convex closure including that curved surface is found and on the basis of each convex closure found in a convex closure interference deciding part 5, the presence/absence of interference on the curved surface between the 3D forms is more exactly decided.
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