Convert_CircleToBSplineCurve 圆转多义线 Convert_CircleToBSplineCurve Convert_CompBezierCurves2dToBSplineCurve2d Bezier转样条曲线 Convert_CompBezierCurvesToBSplineCurve non-rational Bezier curve转样条曲线 Convert_CylinderToBSplineSurface 圆柱体转换为有理B样条曲面。