* Created a way that the OpenSimulator scene can ask the physics scene to do a raycast test safely.

* Test for prim obstructions between the avatar and camera.  If there are obstructions, inform the client to move the camera closer.  This makes it so that walls and objects don't obstruct your view while you're moving around.   Try walking inside a hollowed tori.   You'll see how much easier it is now because your camera automatically moves closer so you can still see.
* Created a way to know if the user's camera is alt + cammed or just following the avatar.
* Changes IClientAPI interface by adding SendCameraConstraint(Vector4 CameraConstraint)

OpenSim/Region/Examples/SimpleModule/MyNpcCharacter.cs

@@ -900,6 +900,11 @@ namespace OpenSim.Region.Examples.SimpleModule
         public void SendLandObjectOwners(LandData land, List<UUID> groups, Dictionary<UUID, int> ownersAndCount)
         {
         }
+
+        public void SendCameraConstraint(Vector4 ConstraintPlane)
+        {
+
+        }
         
         public void SendLandParcelOverlay(byte[] data, int sequence_id)
         {