Added particle trails for things like exhaust on a car.

samples/o3djs/base.js

Index: samples/o3djs/base.js
===================================================================
--- samples/o3djs/base.js	(revision 18491)
+++ samples/o3djs/base.js	(working copy)
@@ -641,6 +641,17 @@
 };
 
 /**
+ * Makes one class inherit from another.
+ * @param {!Object} subClass Class that wants to inherit.
+ * @param {!Object} superClass Class to inherit from.
+ */
+o3djs.base.inherit = function(subClass, superClass) {
+  var tmpClass = function() { };
+  tmpClass.prototype = superClass.prototype;
+  subClass.prototype = new tmpClass();
+};
+
+/**
  * Parses an error stack from an exception
  * @param {!Exception} excp The exception to get a stack trace from.
  * @return {!Array.<string>} An array of strings of the stack trace.