Updated MeshPhysicalMaterial doc

docs/api/materials/MeshPhysicalMaterial.html

@@ -40,30 +40,53 @@
 
 		<h3>[name]( [page:Object parameters] )</h3>
 		<div>
-		parameters -- see [page:MeshStandardMaterial]
+		[page:Object parameters] - (optional) an object with one or more properties defining the material's appearance.
+		Any property of the material (including any property inherited from [page:Material] and [page:MeshStandardMaterial]) can be passed in here.<br /><br />
+
+		The exception is the property [page:Hexadecimal color], which can be passed in as a hexadecimal
+		string and is *0xffffff* (white) by default. [page:Color.set]( color ) is called internally.
 		</div>
 
 
 		<h2>Properties</h2>
 		<div>See the base [page:Material] and [page:MeshStandardMaterial] classes for common properties.</div>
 
-		<h3>[property:Float reflectivity]</h3>
-		<div>
-		Degree of reflectivity, from *0.0* to *1.0*. Default is *0.5*.<br />
-			
-		This models the reflectivity of non-metallic materials. It has no effect when [page:MeshStandardMaterial.metalness metalness] is *1.0*
-		</div>
-
 		<h3>[property:Float clearCoat]</h3>
 		<div>
 		ClearCoat level, from *0.0* to *1.0*. Default is *0.0*.
 		</div>
 
 		<h3>[property:Float clearCoatRoughness]</h3>
+		<div>How rough the clearCoat appears, from *0.0* to *1.0*. Default is *0.0*.</div>
+
+		<h3>[property:Boolean isMeshPhysicalMaterial]</h3>
+		<div>
+			Used to check whether this or derived classes are mesh physical materials. Default is *true*.<br /><br />
+
+			You should not change this, as it used internally for optimisation.
+		</div>
+
+		<h3>[property:Object defines]</h3>
+		<div>An object of the form:
+			<code>
+				{ 'PHYSICAL': '' };
+			</code>
+
+			This is used by the [page:WebGLRenderer] for selecting shaders.
+		</div>
+
+		<h3>[property:Float reflectivity]</h3>
 		<div>
-		How rough the clearCoat appears, from *0.0* to *1.0*. Default is *0.0*.
+		Degree of reflectivity, from *0.0* to *1.0*. Default is *0.5*.<br />
+
+		This models the reflectivity of non-metallic materials. It has no effect when [page:MeshStandardMaterial.metalness metalness] is *1.0*
 		</div>
 
+		<h2>Methods</h2>
+		<h2>Properties</h2>
+		<div>See the base [page:Material] and [page:MeshStandardMaterial] classes for common methods.</div>
+
+
 		<h2>Source</h2>
 
 		[link:https://github.com/mrdoob/three.js/blob/master/src/[path].js src/[path].js]