Unity - Scripting API:

public Plane(inNormal: Vector3, inPoint: Vector3)

public Plane(Vector3 inNormal, Vector3 inPoint);

Parameters

Creates a plane.

Resulting plane has normal inNormal and goes through a point inPoint.

inNormal must be a normalized vector.

public Plane(inNormal: Vector3, d: float)

public Plane(Vector3 inNormal, float d);

Creates a plane.

Resulting plane has normal inNormal and distance d.

inNormal must be a normalized vector.

public Plane(a: Vector3, b: Vector3, c: Vector3)

public Plane(Vector3 a, Vector3 b, Vector3 c);

Creates a plane.

The resulting plane goes through the given three points. The points go around clockwise as you look down on the top surface of the plane.