Updated Sprite doc

docs/api/objects/Sprite.html

@@ -12,35 +12,48 @@
 
 		<h1>[name]</h1>
 
-		<div class="desc">A sprite is a plane in an 3d scene which faces always towards the camera.<br /><br />Sprites do not cast shadows, setting <code>castShadow = true</code> will have no effect.</div>
+		<div class="desc">
+			A sprite is a plane that always faces towards the camera, generally with a
+			partially transparent texture applied.<br /><br />
 
-                <h2>Example</h2>
+			Sprites do not cast shadows, setting <code>castShadow = true</code> will have no effect.
+		</div>
+
+		<h2>Example</h2>
 
-                <code>
-                var map = new THREE.TextureLoader().load( "sprite.png" );
-                var material = new THREE.SpriteMaterial( { map: map, color: 0xffffff, fog: true } );
-                var sprite = new THREE.Sprite( material );
-                scene.add( sprite );
-                </code>
+		<code>
+var spriteMap = new THREE.TextureLoader().load( "sprite.png" );
+var spriteMaterial = new THREE.SpriteMaterial( { map: spriteMap, color: 0xffffff } );
+var sprite = new THREE.Sprite( spriteMaterial );
+scene.add( sprite );
+		</code>
 
 
 		<h2>Constructor</h2>
 
 		<h3>[name]( [page:Material material] )</h3>
 		<div>
-                material — An instance of [page:Material] (optional).
-		</div>
-		<div>
-		This creates a new sprite with an specific material.
+    [page:Material material] - (optional) an instance of [page:SpriteMaterial]. Default is a white [page:SpriteMaterial].<br /><br />
+
+		Creates a new [name].
 		</div>
 
 
 		<h2>Properties</h2>
 		<div>See the base [page:Object3D] class for common properties.</div>
 
+		<h3>[property:Boolean isSprite]</h3>
+		<div>
+			Used to check whether this or derived classes are sprites. Default is *true*.<br /><br />
+
+			You should not change this, as it used internally for optimisation.
+		</div>
+
+
 		<h3>[property:SpriteMaterial material]</h3>
 		<div>
-		An instance of [page:Material], defining the object's appearance. Default is a [page:SpriteMaterial] which is a white plane.
+		An instance of [page:SpriteMaterial], defining the object's appearance.
+		Default is a white [page:SpriteMaterial].
 		</div>
 
 
@@ -49,7 +62,13 @@
 
 		<h3>[method:Sprite clone]()</h3>
 		<div>
-		Returns a clone of this Sprite object and its descendants.
+		Returns a clone of this Sprite object and any descendants.
+		</div>
+
+		<h3>[method:Array raycast]( [page:Raycaster raycaster], [page:Array intersects] )</h3>
+		<div>
+		Get intersections between a casted ray and this sprite.
+		[page:Raycaster.intersectObject] will call this method.
 		</div>