Fix regression where mouse look flight direction no longer worked by zeroing x/y rot before sending agent updates, instead of before any agent update processing

It turns out that the x/y rot data in mouselook is needed to implement this and to push the avatar against the ground if walking in mouselook.
Doing this in the terse send so that we preserve mouselook rotation information

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();