Checkpoint, I've got an interactive 2d scene mostly working.

git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@4151 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/as/com/threerings/util/ClassUtil.as

@@ -28,8 +28,16 @@ public class ClassUtil
 
     public static function getClassByName (cname :String) :Class
     {
-        // see also ApplicationDomain.currentDomain.getClass(cname)
-        return (getDefinitionByName(cname.replace("::", ".")) as Class);
+        try {
+            // see also ApplicationDomain.currentDomain.getClass(cname)
+            return (getDefinitionByName(cname.replace("::", ".")) as Class);
+
+        } catch (error :ReferenceError) {
+            var log :Log = Log.getLog(ClassUtil);
+            log.warning("Unknown class: " + cname);
+            log.logStackTrace(error);
+        }
+        return null; // error case
     }
 
     public static function isFinal (type :Class) :Boolean

src/as/com/threerings/util/Hashtable.as

@@ -268,6 +268,7 @@ public class Hashtable
      */
     protected function indexFor (hash :int) :int
     {
+        // TODO: improve?
         return Math.abs(hash) % _entries.length;
     }