compute() {

		const a = this.edge.tail();
		const b = this.edge.head();
		const c = this.edge.next.head();

		_triangle.set( a.point, b.point, c.point );

		_triangle.getNormal( this.normal );
		_triangle.getMidpoint( this.midpoint );
		this.area = _triangle.getArea();

		this.constant = this.normal.dot( this.midpoint );

		return this;

	}
Computes all properties of the face.

@private
@return {Face} A reference to this face.