Curvature calculation device, the curvature line writing device, curvature calculation method and program

摘要

PROBLEM TO BE SOLVED: To accurately determine the curvature of a curvature line.SOLUTION: The curvature computing device includes a curvature computing unit for calculating the curvature of a curvature line by solving a simultaneous equation, on the basis of an equation in which a second-order differential equation related to the arc length when the curvature line is assumed to be a space curve is equal to a second-order differential equation related to the arc length when the curvature line is assumed to be a curve on a curve surface, and an equation obtained by using the arc length as a parameter and differentiating the equation showing the curvature line on the curve surface with respect to the arc length.