refraction example

examples/webgl_postprocessing_nodes.html

@@ -113,6 +113,7 @@
 					'basic / Fade': 'fade',
 					'basic / Invert': 'invert',
 					'adv / Saturation': 'saturation',
+					'adv / Refraction': 'refraction',
 					'adv / Mosaic': 'mosaic',
 				} ).onFinishChange( function() {