static containsPoint( point, a, b, c ) {

		// if the triangle is degenerate then we can't contain a point
		if ( this.getBarycoord( point, a, b, c, _v3$2 ) === null ) {

			return false;

		}

		return ( _v3$2.x >= 0 ) && ( _v3$2.y >= 0 ) && ( ( _v3$2.x + _v3$2.y ) <= 1 );

	}
Returns `true` if the given point, when projected onto the plane of the
triangle, lies within the triangle.

@param {Vector3} point - The point in 3D space to test.
@param {Vector3} a - The first corner of the triangle.
@param {Vector3} b - The second corner of the triangle.
@param {Vector3} c - The third corner of the triangle.
@return {boolean} Whether the given point, when projected onto the plane of the
triangle, lies within the triangle or not.