zRotate( point, angle ) {

		this._rotationMatrix.makeRotationAxis( this._rotationAxis, angle );
		this._translationMatrix.makeTranslation( - point.x, - point.y, - point.z );

		this._m4_1.makeTranslation( point.x, point.y, point.z );
		this._m4_1.multiply( this._rotationMatrix );
		this._m4_1.multiply( this._translationMatrix );

		this._v3_1.setFromMatrixPosition( this._gizmoMatrixState ).sub( point );	//vector from rotation center to gizmos position
		this._v3_2.copy( this._v3_1 ).applyAxisAngle( this._rotationAxis, angle );	//apply rotation
		this._v3_2.sub( this._v3_1 );

		this._m4_2.makeTranslation( this._v3_2.x, this._v3_2.y, this._v3_2.z );

		this.setTransformationMatrices( this._m4_1, this._m4_2 );
		return _transformation;

	}
Rotates camera around its direction axis passing by a given point by a given angle.

@private
@param {Vector3} point - The point where the rotation axis is passing trough.
@param {number} angle - Angle in radians.
@returns {Object} The computed transformation matrix.