From b264b35e20c90f998cad0bd53feb2348dcaf3ecd Mon Sep 17 00:00:00 2001
From: David Rose <david@ddrose.com>
Date: Wed, 11 Feb 2004 23:21:44 +0000
Subject: [PATCH] maybe there's no mouse

---
 direct/src/showbase/ShowBase.py | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/direct/src/showbase/ShowBase.py b/direct/src/showbase/ShowBase.py
index c55ab98e99..bcc9b1f5ae 100644
--- a/direct/src/showbase/ShowBase.py
+++ b/direct/src/showbase/ShowBase.py
@@ -123,6 +123,10 @@ class ShowBase(DirectObject.DirectObject):
         self.pipeList = []
         self.mak = None
         self.mouse2cam = None
+        self.mouseInterface = None
+        self.mouseWatcherNode = None
+        self.drive = None
+        self.trackball = None
         self.cam = None
         self.camList = []
         self.camNode = None
@@ -1222,16 +1226,18 @@ class ShowBase(DirectObject.DirectObject):
         """
         Switch mouse action to drive mode
         """
-        self.changeMouseInterface(self.drive)
-        # Set the height to a good eyeheight
-        self.mouseInterfaceNode.reset()
-        self.mouseInterfaceNode.setZ(4.0)
+        if self.drive:
+            self.changeMouseInterface(self.drive)
+            # Set the height to a good eyeheight
+            self.mouseInterfaceNode.reset()
+            self.mouseInterfaceNode.setZ(4.0)
 
     def useTrackball(self):
         """
         Switch mouse action to trackball mode
         """
-        self.changeMouseInterface(self.trackball)
+        if self.trackball:
+            self.changeMouseInterface(self.trackball)
 
     def oobe(self):
         """