small changes

space_view3d_virtual_reality/hmd/__init__.py

@@ -71,7 +71,7 @@ class HMD_Base:
         self._color_object = [0, 0]
         self._offscreen_object = [None, None]
         self._eye_pose = [Vector((0.0, 0.0, 0.0)), Vector((0.0, 0.0, 0.0))]
-        self._head_transformation = [Matrix.Identity(4), Matrix.Identity(4)]
+        self._head_transformation = Matrix.Identity(4)
 
     @property
     def width(self):
@@ -128,6 +128,8 @@ class HMD_Base:
 
         except Exception as E:
             print(E)
+            self._offscreen_object[0] = None
+            self._offscreen_object[1] = None
             return False
 
         else:

space_view3d_virtual_reality/operator.py

@@ -89,7 +89,6 @@ class VirtualRealityDisplayOperator(bpy.types.Operator):
                 # quit right away
                 wm.virtual_reality.is_enabled = False
                 self._quit(context)
-                self.report({'ERROR'}, "Error initializing device")
 
         return {'CANCELLED'}
 
@@ -138,9 +137,11 @@ class VirtualRealityDisplayOperator(bpy.types.Operator):
         self._preview = Preview()
 
         if not self._hmd.isConnected():
+            self.report({'ERROR'}, "Device not connected")
             return False
 
         if not self._hmd.init():
+            self.report({'ERROR'}, "Error initializing device")
             return False
 
         # get the data from device