added --help option, updated util/Transform

git-svn-id: svn://anubis/fart/trunk@26 7f9b0f55-74a9-4bce-be96-3c2cd072584d

main/fart.cc

@@ -28,6 +28,7 @@ int main(int argc, char * argv[])
     map<string, const char *> scene_options;
 
     static const struct option long_options[] = {
+        { "help",           no_argument,       NULL, 256 },
         { "output-file",    required_argument, NULL, 'o' },
         { "width",          required_argument, NULL, 'w' },
         { "height",         required_argument, NULL, 'h' },
@@ -41,6 +42,9 @@ int main(int argc, char * argv[])
     {
         switch (opt)
         {
+            case 256:
+                usage(argv[0]);
+                break;
             case 'o':
                 scene_options["output-file"] = optarg;
                 break;