1 files changed, 24 insertions, 1 deletions

diff --git a/OpenSim/Region/ClientStack/Linden/UDP/LLClientView.cs b/OpenSim/Region/ClientStack/Linden/UDP/LLClientView.cs
index c1aae3f..a04ded5 100644
--- a/OpenSim/Region/ClientStack/Linden/UDP/LLClientView.cs
+++ b/OpenSim/Region/ClientStack/Linden/UDP/LLClientView.cs
@@ -5091,7 +5091,18 @@ namespace OpenSim.Region.ClientStack.LindenUDP
 //                acceleration = new Vector3(1, 0, 0);
                 
                 angularVelocity = presence.AngularVelocity;
+
+                // Whilst not in mouselook, an avatar will transmit only the Z rotation as this is the only axis
+                // it rotates around.
+                // In mouselook, X and Y co-ordinate will also be sent but when used in Rotation, these cause unwanted
+                // excessive up and down movements of the camera when looking up and down.
+                // See http://opensimulator.org/mantis/view.php?id=3274
+                // This does not affect head movement, since this is controlled entirely by camera movement rather than
+                // body rotation.  It does not affect sitting avatar since it's the sitting part rotation that takes
+                // effect, not the avatar rotation.
                 rotation = presence.Rotation;
+                rotation.X = 0;
+                rotation.Y = 0;
 
                 if (sendTexture)
                     textureEntry = presence.Appearance.Texture.GetBytes();
@@ -5207,7 +5218,19 @@ namespace OpenSim.Region.ClientStack.LindenUDP
             data.OffsetPosition.ToBytes(objectData, 16);
 //            data.Velocity.ToBytes(objectData, 28);
 //            data.Acceleration.ToBytes(objectData, 40);
-            data.Rotation.ToBytes(objectData, 52);
+
+            // Whilst not in mouselook, an avatar will transmit only the Z rotation as this is the only axis
+            // it rotates around.
+            // In mouselook, X and Y co-ordinate will also be sent but when used in Rotation, these cause unwanted
+            // excessive up and down movements of the camera when looking up and down.
+            // See http://opensimulator.org/mantis/view.php?id=3274
+            // This does not affect head movement, since this is controlled entirely by camera movement rather than
+            // body rotation.  It does not affect sitting avatar since it's the sitting part rotation that takes
+            // effect, not the avatar rotation.
+            Quaternion rot = data.Rotation;
+            rot.X = 0;
+            rot.Y = 0;
+            rot.ToBytes(objectData, 52);
             //data.AngularVelocity.ToBytes(objectData, 64);
 
             ObjectUpdatePacket.ObjectDataBlock update = new ObjectUpdatePacket.ObjectDataBlock();