实体定义
三维曲线(GfcCurve3d),是各种三维线段的基类。
继承关系
GfcRoot
└
GfcGeometry
└GfcCurve3d
├
GfcLine3d
├
GfcNurbsCurve3d
├
GfcIntersectionCurve3d
├
GfcSpiralLine3d
├
GfcSweepCurve3d
├
GfcImageCurve3d
└
GfcPlaneCurve3d