METHOD AND PROCESSOR FOR CURVE DEFORMATION, STORAGE MEDIUM STORED WITH CURVE FORMING PROGRAM, METHOD AND PROCESSOR FOR CURVED SURFACE DEFORMATION, AND STORAGE MEDIUM STORED WITH CURVED SURFACE DEFORMING PROGRAM

摘要

PROBLEM TO BE SOLVED: To perform a deforming process while referring to specifying curves and to improve a deforming operation processing by deforming frame lines passing a movement point on the basis of a predetermined 1st circular rate-of-change specifying curve, based on the movement point as a reference value.;SOLUTION: A curved surface SB to be deformed, the movement point P1, and a moving vector quantity are given. Then a rate-of-change specifying curve is generated for two longitudinal and lateral frame lines passing the movement point P1. The two frame lines are deformed according to the given rate-of-change. Similarly, frame lines which do not pass the movement point are deformed while interpolated. Namely, the correspondence positions of respective passing points of respective rate-of-change curves on the curved surface are found, the positions, the directions of tangents at the positions, and the values of tangent vectors are found, and a process for multiplying the positions of the original frame lines, the tangent directions, and tangent vectors is performed to deform the curve. Then a patch is generated from the deformed frame lines to obtain a curved surface after deformation. Thus, the frame lines passing the movement point are deformed according to the 1st rate-of- change specifying curve.;COPYRIGHT: (C)2000,JPO