fixed getIntersections bug

tests/html/unitTests.html

@@ -13,6 +13,10 @@
             window.onload = function() {
                 var test = new Test();
                 test.run();
+                
+                document.getElementsByTagName('body')[0].addEventListener('mousemove', function(evt) {
+                    console.log(evt.clientX + ',' + evt.clientY);
+                }, false);
             };
         </script>
     </head>