Mantis#1859. Thank you kindly, Lmmz for a patch that:

Implements llForceMouselook().

OpenSim/Region/Environment/Scenes/SceneObjectPart.cs

@@ -195,6 +195,12 @@ namespace OpenSim.Region.Environment.Scenes
         protected LLUUID m_uuid;
         protected LLVector3 m_velocity;
 
+        // TODO: Those have to be changed into persistent properties at some later point,
+        // or sit-camera on vehicles will break on sim-crossing. 
+        private LLVector3 m_cameraEyeOffset = new LLVector3(0.0f, 0.0f, 0.0f);
+        private LLVector3 m_cameraAtOffset = new LLVector3(0.0f, 0.0f, 0.0f);
+        private bool m_forceMouselook = false;
+        
         #endregion Fields
 
         #region Constructors
@@ -3313,6 +3319,30 @@ namespace OpenSim.Region.Environment.Scenes
             }
         }
 
+        public void SetCameraAtOffset(LLVector3 v) {
+            m_cameraAtOffset = v;
+        }
+        
+        public void SetCameraEyeOffset(LLVector3 v) {
+            m_cameraEyeOffset = v;
+        }
+        
+        public void SetForceMouselook(bool force) {
+            m_forceMouselook = force;
+        }
+        
+        public LLVector3 GetCameraAtOffset() {
+            return m_cameraAtOffset;
+        }
+        
+        public LLVector3 GetCameraEyeOffset() {
+            return m_cameraEyeOffset;
+        }
+        
+        public bool GetForceMouselook() {
+            return m_forceMouselook;
+        }
+        
         #endregion Public Methods
     }
 }

OpenSim/Region/Environment/Scenes/ScenePresence.cs

@@ -1129,6 +1129,9 @@ namespace OpenSim.Region.Environment.Scenes
             bool autopilot = true;
             LLVector3 pos = new LLVector3();
             LLQuaternion sitOrientation = new LLQuaternion(0, 0, 0, 1);
+            LLVector3 cameraEyeOffset = LLVector3.Zero;
+            LLVector3 cameraAtOffset = LLVector3.Zero;
+            bool forceMouselook = false;
 
             //SceneObjectPart part =  m_scene.GetSceneObjectPart(targetID);
             SceneObjectPart part =  FindNextAvailableSitTarget(targetID);
@@ -1183,9 +1186,13 @@ namespace OpenSim.Region.Environment.Scenes
                         RemoveFromPhysicalScene();
                     }
                 }
+                
+                cameraAtOffset = part.GetCameraAtOffset();
+                cameraEyeOffset = part.GetCameraEyeOffset();
+                forceMouselook = part.GetForceMouselook();
             }
 
-            ControllingClient.SendSitResponse(targetID, offset, sitOrientation, autopilot, LLVector3.Zero, LLVector3.Zero, false);
+            ControllingClient.SendSitResponse(targetID, offset, sitOrientation, autopilot, cameraAtOffset, cameraEyeOffset, forceMouselook);
             m_requestedSitTargetUUID = targetID;
             // This calls HandleAgentSit twice, once from here, and the client calls
             // HandleAgentSit itself after it gets to the location

OpenSim/Region/ScriptEngine/Common/LSL_BuiltIn_Commands.cs

@@ -4747,13 +4747,13 @@ namespace OpenSim.Region.ScriptEngine.Common
         public void llSetCameraEyeOffset(LSL_Types.Vector3 offset)
         {
             m_host.AddScriptLPS(1);
-            NotImplemented("llSetCameraEyeOffset");
+            m_host.SetCameraEyeOffset(new LLVector3((float)offset.x, (float)offset.y, (float)offset.z));
         }
 
         public void llSetCameraAtOffset(LSL_Types.Vector3 offset)
         {
             m_host.AddScriptLPS(1);
-            NotImplemented("llSetCameraAtOffset");
+            m_host.SetCameraAtOffset(new LLVector3((float)offset.x, (float)offset.y, (float)offset.z));
         }
 
         public string llDumpList2String(LSL_Types.list src, string seperator)
@@ -6627,7 +6627,7 @@ namespace OpenSim.Region.ScriptEngine.Common
         public void llForceMouselook(int mouselook)
         {
             m_host.AddScriptLPS(1);
-            NotImplemented("llForceMouselook");
+            m_host.SetForceMouselook(mouselook != 0);
         }
 
         public double llGetObjectMass(string id)

OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs

@@ -4609,13 +4609,13 @@ namespace OpenSim.Region.ScriptEngine.Shared.Api
         public void llSetCameraEyeOffset(LSL_Types.Vector3 offset)
         {
             m_host.AddScriptLPS(1);
-            NotImplemented("llSetCameraEyeOffset");
+            m_host.SetCameraEyeOffset(new LLVector3((float)offset.x, (float)offset.y, (float)offset.z));
         }
 
         public void llSetCameraAtOffset(LSL_Types.Vector3 offset)
         {
             m_host.AddScriptLPS(1);
-            NotImplemented("llSetCameraAtOffset");
+            m_host.SetCameraAtOffset(new LLVector3((float)offset.x, (float)offset.y, (float)offset.z));
         }
 
         public string llDumpList2String(LSL_Types.list src, string seperator)
@@ -6410,7 +6410,7 @@ namespace OpenSim.Region.ScriptEngine.Shared.Api
         public void llForceMouselook(int mouselook)
         {
             m_host.AddScriptLPS(1);
-            NotImplemented("llForceMouselook");
+            m_host.SetForceMouselook(mouselook != 0);
         }
 
         public double llGetObjectMass(string id)