| 摘要 |
PURPOSE:To prevent an influence from being given to a surrounding patch form by replacing the vector coefficient of a necessary auxiliary vector to be equal value for the patch of a vector function, which is spread in a frame space to form a free curved surface, obtaining a specified control side vector with using a prescribed expression and spreading again the patch. CONSTITUTION:When a patch S(U,V),C is spread again, auxiliary vectors C0X and C3X are obtained from nodal points P(0,0)AC and P(0,3)AC in the both edges of a shared border COMAC with an adjacent patch S(U,V)A, etc., toward the nodal point which is correspond to an adjacent patch S(U,V)D on a plane surface to include control side vectors (a0, b1) and (a3, b3) of the adjacent patch. The coefficients of component in a direction, which crosses an internal border COMac of these vectors C0X and C3X, are replaced with the mutually equal values and with using a trangential plane continuous expression, control side vectors C1 and C2, which expresse internal control points P(1,1)CA and P(1,2)CA of the patch S(U,V)C are obtained. Then, based on this result, when the patch is spread again, without giving the influence to the adjacent patch, the patch can be spread again. |
