public static Plane CreateByThreePoints(
	XYZ point1,
	XYZ point2,
	XYZ point3
)

Public Shared Function CreateByThreePoints ( _
	point1 As XYZ, _
	point2 As XYZ, _
	point3 As XYZ _
) As Plane

public:
static Plane^ CreateByThreePoints(
	XYZ^ point1, 
	XYZ^ point2, 
	XYZ^ point3
)

The points supplied as arguments must fully define a plane: they may not lie on a straight line or be too close to each other. The points must lie within the Revit design limits. This function does not guarantee a specific parameterization of the created Plane. Use Plane.Create(Frame) to enforce a specific parameterization of the created Plane object. All three points are expected to lie within the Revit design limits IsWithinLengthLimits(XYZ).