OpenSim​/llLookAt

       public void llLookAt(LSL_Vector target, double strength, double damping)
       {
           m_host.AddScriptLPS(1);
           // Determine where we are looking from
           LSL_Vector from = llGetPos();

           // normalized direction to target
           LSL_Vector dir = llVecNorm(target - from);

           // Janus Dugong & Fumi.Hax
           if (LSL_Vector.Mag(dir)<=0.0) return;
           //
           LSL_Vector vec_yaw = new LSL_Vector(0.0, 0.0, Math.Atan2(dir.y, dir.x));    // yaw
           LSL_Vector vec_pth = new LSL_Vector(0.0, Math.Acos(dir.z), 0.0);            // pitch
           LSL_Rotation rot_yaw = llEuler2Rot(vec_yaw);
           LSL_Rotation rot_pth = llEuler2Rot(vec_pth);
           LSL_Rotation rot = rot_pth * rot_yaw;

           // Per discussion with Melanie, for non-physical objects llLookAt appears to simply
           // set the rotation of the object, copy that behavior
           PhysicsActor pa = m_host.PhysActor;

           if (strength == 0 || pa == null || !pa.IsPhysical)
           {
               llSetRot(rot);
           }
           else
           {
               m_host.StartLookAt(rot, (float)strength, (float)damping);
           }
       }