Improved webvr_ballshooter example.

Author: mrdoob

examples/webvr_ballshooter.html

@@ -191,7 +191,7 @@
 
 				//
 
-				var delta = clock.getDelta();
+				var delta = clock.getDelta() * 0.8; // slow down simulation
 
 				var range = 3 - radius;