diff --git a/OpenSim/Region/Framework/Scenes/ScenePresence.cs b/OpenSim/Region/Framework/Scenes/ScenePresence.cs
index 283de39390..ec8716ba6e 100644
--- a/OpenSim/Region/Framework/Scenes/ScenePresence.cs
+++ b/OpenSim/Region/Framework/Scenes/ScenePresence.cs
@@ -91,7 +91,7 @@ namespace OpenSim.Region.Framework.Scenes
         /// rotation, prim cut, prim twist, prim taper, and prim shear. See mantis
         /// issue #1716
         /// </summary>
-        public static readonly Vector3 SIT_TARGET_ADJUSTMENT = new Vector3(0.0f, 0.0f, 0.418f);
+        public static readonly Vector3 SIT_TARGET_ADJUSTMENT = new Vector3(0.0f, 0.0f, 0.4f);
 
         /// <summary>
         /// Movement updates for agents in neighboring regions are sent directly to clients.
@@ -2301,7 +2301,27 @@ namespace OpenSim.Region.Framework.Scenes
 
                     //Quaternion result = (sitTargetOrient * vq) * nq;
 
-                    m_pos = sitTargetPos + SIT_TARGET_ADJUSTMENT;
+                    double x, y, z, m;
+
+                    Quaternion r = sitTargetOrient;
+                    m = r.X * r.X + r.Y * r.Y + r.Z * r.Z + r.W * r.W;
+
+                    if (Math.Abs(1.0 - m) > 0.000001)
+                    {
+                        m = 1.0 / Math.Sqrt(m);
+                        r.X *= (float)m;
+                        r.Y *= (float)m;
+                        r.Z *= (float)m;
+                        r.W *= (float)m;
+                    }
+
+                    x = 2 * (r.X * r.Z + r.Y * r.W);
+                    y = 2 * (-r.X * r.W + r.Y * r.Z);
+                    z = -r.X * r.X - r.Y * r.Y + r.Z * r.Z + r.W * r.W;
+
+                    Vector3 up = new Vector3((float)x, (float)y, (float)z);
+                    Vector3 sitOffset = up * Appearance.AvatarHeight * 0.02638f;
+                    m_pos = sitTargetPos + sitOffset + SIT_TARGET_ADJUSTMENT;
                     Rotation = sitTargetOrient;
                     ParentPosition = part.AbsolutePosition;
                     part.ParentGroup.AddAvatar(UUID);
diff --git a/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs b/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs
index 2a23c595e7..84792c0b1a 100644
--- a/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs
+++ b/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs
@@ -7542,27 +7542,59 @@ namespace OpenSim.Region.ScriptEngine.Shared.Api
 
                 int remain = rules.Length - idx;
 
-                
-
                 switch (code)
                 {
                     case (int)ScriptBaseClass.PRIM_POSITION:
-                        if (remain < 1)
-                            return;
-                        LSL_Vector v;
-                        v = rules.GetVector3Item(idx++);
-                        av.OffsetPosition = new Vector3((float)v.x, (float)v.y, (float)v.z);
-                        av.SendAvatarDataToAllAgents();
+                        {
+                            if (remain < 1)
+                                return;
+                            LSL_Vector v;
+                            v = rules.GetVector3Item(idx++);
 
+                            SceneObjectPart part = World.GetSceneObjectPart(av.ParentID);
+                            if (part == null)
+                                break;
+
+                            LSL_Rotation localRot = ScriptBaseClass.ZERO_ROTATION;
+                            LSL_Vector localPos = ScriptBaseClass.ZERO_VECTOR;
+                            if (llGetLinkNumber() > 1)
+                            {
+                                localRot = llGetLocalRot();
+                                localPos = llGetLocalPos();
+                            }
+
+                            v -= localPos;
+                            v /= localRot;
+
+                            LSL_Vector sitOffset = (llRot2Up(new LSL_Rotation(av.Rotation.X, av.Rotation.Y, av.Rotation.Z, av.Rotation.W)) * av.Appearance.AvatarHeight * 0.02638f);
+                            
+                            v = v + 2 * sitOffset;
+
+                            av.OffsetPosition = new Vector3((float)v.x, (float)v.y, (float)v.z);
+                            av.SendAvatarDataToAllAgents();
+
+                        }
                         break;
 
                     case (int)ScriptBaseClass.PRIM_ROTATION:
-                        if (remain < 1)
-                            return;
-                        LSL_Rotation r;
-                        r = rules.GetQuaternionItem(idx++);
-                        av.Rotation = new Quaternion((float)r.x, (float)r.y, (float)r.z, (float)r.s);
-                        av.SendAvatarDataToAllAgents();
+                        {
+                            if (remain < 1)
+                                return;
+
+                            LSL_Rotation localRot = ScriptBaseClass.ZERO_ROTATION;
+                            LSL_Vector localPos = ScriptBaseClass.ZERO_VECTOR;
+                            if (llGetLinkNumber() > 1)
+                            {
+                                localRot = llGetLocalRot();
+                                localPos = llGetLocalPos();
+                            }
+
+                            LSL_Rotation r;
+                            r = rules.GetQuaternionItem(idx++);
+                            r = r * llGetRootRotation() / localRot;
+                            av.Rotation = new Quaternion((float)r.x, (float)r.y, (float)r.z, (float)r.s);
+                            av.SendAvatarDataToAllAgents();
+                        }
                         break;
                 }
             }