add example for all data

examples/multi_thread_download_example.py

@@ -22,3 +22,9 @@
               camera_name = ['lcam_front', 'lcam_right', 'lcam_back', 'lcam_left', 'lcam_top', 'lcam_bottom'], 
               unzip = True,
               num_workers = 8)
+
+# To download the entire dataset
+alldata = ta.get_all_data() # this fill in all available data for env, difficulty, modality and camera_name
+ta.download_multi_thread(**alldata, 
+                            unzip = True,
+                            num_workers = 8)

tartanair/tartanair.py

@@ -84,7 +84,14 @@ def init(tartanair_root):
     is_init = True
 
     return True
-
+
+def get_all_data():
+    global downloader
+    return {"env": downloader.env_names, 
+            "difficulty": downloader.difficulty_names, 
+            "modality": downloader.modality_names, 
+            "camera_name": downloader.camera_names, 
+    } 
 
 def download(env = [], difficulty = [], modality = [], camera_name = [], config = None, unzip = False):
     """