Fixed decals example order.

examples/webgl_decals.html

@@ -289,6 +289,7 @@
 			material.color.setHex( Math.random() * 0xffffff );
 
 			var m = new THREE.Mesh( new THREE.DecalGeometry( mesh, p, r, s, check ), material );
+			m.renderDepth = - scene.children.length;
 			decals.push( m );
 			scene.add( m );