Improve Blender file parsing.

utilities/get_blender_info.py

@@ -0,0 +1,19 @@
+import json
+import bpy
+
+# Get all cameras
+cameras = []
+for cam_obj in bpy.data.cameras:
+    user_map = bpy.data.user_map(subset={cam_obj}, value_types={'OBJECT'})
+    for data_obj in user_map[cam_obj]:
+        cam = {'name': data_obj.name, 'lens': cam_obj.lens}
+        cameras.append(cam)
+
+data = {'cameras':  cameras,
+        'frame_start': bpy.data.scenes[0].frame_start,
+        'frame_end': bpy.data.scenes[0].frame_end,
+        'resolution_x': bpy.data.scenes[0].render.resolution_x,
+        'resolution_y': bpy.data.scenes[0].render.resolution_y}
+
+data_string = json.dumps(data)
+print("SCENE_DATA:" + data_string)