2 files changed, 14 insertions, 4 deletions

diff --git a/OpenSim/Region/Framework/Scenes/Scene.cs b/OpenSim/Region/Framework/Scenes/Scene.cs
index f7fd767..fa90ef4 100644
--- a/OpenSim/Region/Framework/Scenes/Scene.cs
+++ b/OpenSim/Region/Framework/Scenes/Scene.cs
@@ -1495,7 +1495,7 @@ namespace OpenSim.Region.Framework.Scenes
                     // Objects queue their updates onto all scene presences
                     if (Frame % m_update_objects == 0)
                         m_sceneGraph.UpdateObjectGroups();
-    
+
                     // Run through all ScenePresences looking for updates
                     // Presence updates and queued object updates for each presence are sent to clients
                     if (Frame % m_update_presences == 0)
diff --git a/OpenSim/Region/Framework/Scenes/ScenePresence.cs b/OpenSim/Region/Framework/Scenes/ScenePresence.cs
index d4af9fc..c8971c4 100644
--- a/OpenSim/Region/Framework/Scenes/ScenePresence.cs
+++ b/OpenSim/Region/Framework/Scenes/ScenePresence.cs
@@ -3084,9 +3084,19 @@ namespace OpenSim.Region.Framework.Scenes
                 if (Appearance.AvatarSize != m_lastSize && !IsLoggingIn)
                     SendAvatarDataToAllAgents();
 
-                if (!Rotation.ApproxEquals(m_lastRotation, ROTATION_TOLERANCE) ||
-                    !Velocity.ApproxEquals(m_lastVelocity, VELOCITY_TOLERANCE) ||
-                    !m_pos.ApproxEquals(m_lastPosition, POSITION_TOLERANCE))
+                // Allow any updates for sitting avatars to that llSetPrimitiveLinkParams() can work for very
+                // small increments (e.g. sit position adjusters).  An alternative may be to eliminate the tolerance
+                // checks on all updates but the ramifications of this would need careful consideration.
+                bool updateClients 
+                    = IsSatOnObject && (Rotation != m_lastRotation || Velocity != m_lastVelocity || m_pos != m_lastPosition);
+
+                if (!updateClients)
+                    updateClients 
+                        = !Rotation.ApproxEquals(m_lastRotation, ROTATION_TOLERANCE) 
+                            || !Velocity.ApproxEquals(m_lastVelocity, VELOCITY_TOLERANCE)
+                            || !m_pos.ApproxEquals(m_lastPosition, POSITION_TOLERANCE);
+
+                if (updateClients)
                 {
                     SendTerseUpdateToAllClients();