[name]
		Euler Angles. 
		Euler angles describe a rotation transformation by rotating an object on its various axes in specified amounts per axis, and a specified axis order.
		(More information on 
Wikipedia)
Example
		var a = new THREE.Euler( 0, 1, 1.57, 'XYZ' );
		var b = new THREE.Vector3( 1, 0, 1 );
		b.applyEuler(a);
		
		Constructor
		[name]( [page:Float x], [page:Float y], [page:Float z], [page:String order] )
		
		x -- [page:Float] the angle of the x axis in radians
		y -- [page:Float] the angle of the y axis in radians
		z -- [page:Float] the angle of the z axis in radians
		order -- [page:String] A string representing the order that the rotations are applied, defaults to 'XYZ' (must be upper case).
		
		
		A euler angle for transforming
		
		Properties
		[property:Float x]
		[property:Float y]
		[property:Float z]
		[property:String order]
		Methods
		[method:Euler set]( [page:Float x], [page:Float y], [page:Float z], [page:String order] ) [page:Euler this]
		
		x -- [page:Float] Angle in x axis in radians
		y -- [page:Float] Angle in y axis in radians
		z -- [page:Float] Angle in z axis in radians
		order -- [page:string] Order of axes, defaults to 'XYZ' (must be upper case)
		
		
		Sets the angles of this euler transform.
		
		[method:Euler copy]( [page:Euler euler] ) [page:Euler this]
		
		Copies value of *euler* to this euler.
		
		[method:Euler setFromRotationMatrix]( [page:Matrix4 m], [page:String order] ) [page:Euler this]
		
		m -- [page:Matrix4] assumes upper 3x3 of matrix is a pure rotation matrix (i.e. unscaled)
		order -- [page:string] Order of axes, defaults to 'XYZ' (must be upper case)
		
		
		Sets the angles of this euler transform from a pure rotation matrix based on the orientation specified by order.
		
		[method:Euler setFromQuaternion]( [page:Quaternion q], [page:String order] ) [page:Euler this]
		
		q -- [page:Quaternion] quaternion must be normalized
		order -- [page:string] Order of axes, defaults to 'XYZ' (must be upper case)
		
		
		Sets the angles of this euler transform from a normalized quaternion based on the orientation specified by order.
		
		[method:Euler reorder]( [page:String newOrder] ) [page:Euler this]
		
		Resets the euler angle with a new order by creating a quaternion from this euler angle and then setting this euler angle with the quaternion and the new order. 
		WARNING: this discards revolution information.
		
		[method:Euler setFromVector3]([page:Vector3 vector], [page:String order]) [page:Euler this]
		
		vector -- [page:Vector3].
		order -- [page:string] Order of axes, defaults to 'XYZ' (must be upper case)
		
		
		Optionally Vector3 to the XYZ parameters of Euler, and order to the Euler's order property.
		
		[method:Vector3 toVector3]()
		
		Returns the Euler's XYZ properties as a Vector3.
		
		[method:Euler fromArray]([page:Array array]) [page:Euler this]
		
		array -- [page:Array] of length 3 or 4. array[3] is an optional order argument.
		
		
		Assigns this euler's x angle to array[0]. 
		Assigns this euler's y angle to array[1]. 
		Assigns this euler's z angle to array[2]. 
		Optionally assigns this euler's order to array[3].
		
		[method:Array toArray]( [page:Array array] )
		
		array -- Optional array to store the euler.
		
		
		Returns an array [x, y, z, order]
		
		[method:Boolean equals]( [page:Euler euler] )
		
		Checks for strict equality of this euler and *euler*.
		
		[method:Euler clone]()
		
		Returns a new euler created from this euler.
		
		Source
		[link:https://github.com/mrdoob/three.js/blob/master/src/[path].js src/[path].js]