Constructor.

Public Sub New(
    center As Point3d, 
    normal As Vector3d, 
    referenceVector As Vector3d, 
    radius As double, 
    startAngle As double, 
    endAngle As double
)

public CircularArc3d(
    Point3d center, 
    Vector3d normal, 
    Vector3d referenceVector, 
    double radius, 
    double startAngle, 
    double endAngle
);