This version of Unity is unsupported.

Plane.Set3Points

public void Set3Points(Vector3 a, Vector3 b, Vector3 c);

Parameters

a First point in clockwise order.
b Second point in clockwise order.
c Third point in clockwise order.

Description

Sets a plane using three points that lie within it. The points go around clockwise as you look down on the top surface of the plane.