From 386a13d5d63b32c7c332e7526cdd143e649d7c18 Mon Sep 17 00:00:00 2001
From: UbitUmarov
Date: Sun, 28 Aug 2016 14:59:02 +0100
Subject: mantis: rotate avatar to lookAt o login/teleports. Some cases may
 still be wrong

---
 .../EntityTransfer/EntityTransferModule.cs         |  8 ++++++
 OpenSim/Region/Framework/Scenes/ScenePresence.cs   | 30 ++++++++++++++++++++--
 2 files changed, 36 insertions(+), 2 deletions(-)

diff --git a/OpenSim/Region/CoreModules/Framework/EntityTransfer/EntityTransferModule.cs b/OpenSim/Region/CoreModules/Framework/EntityTransfer/EntityTransferModule.cs
index 58f3dde..71a0e52 100644
--- a/OpenSim/Region/CoreModules/Framework/EntityTransfer/EntityTransferModule.cs
+++ b/OpenSim/Region/CoreModules/Framework/EntityTransfer/EntityTransferModule.cs
@@ -478,9 +478,17 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
             m_entityTransferStateMachine.UpdateInTransit(sp.UUID, AgentTransferState.Transferring);
 
             sp.ControllingClient.SendTeleportStart(teleportFlags);
+            lookAt.Z = 0f;
+
+            if(Math.Abs(lookAt.X) < 0.01f && Math.Abs(lookAt.Y) < 0.01f)
+            {
+                lookAt.X = 1.0f;
+                lookAt.Y = 0;
+            }
 
             sp.ControllingClient.SendLocalTeleport(position, lookAt, teleportFlags);
             sp.TeleportFlags = (Constants.TeleportFlags)teleportFlags;
+            sp.RotateToLookAt(lookAt);
             sp.Velocity = Vector3.Zero;
             sp.Teleport(position);
 
diff --git a/OpenSim/Region/Framework/Scenes/ScenePresence.cs b/OpenSim/Region/Framework/Scenes/ScenePresence.cs
index 50ee9d4..cb7422b 100644
--- a/OpenSim/Region/Framework/Scenes/ScenePresence.cs
+++ b/OpenSim/Region/Framework/Scenes/ScenePresence.cs
@@ -1927,6 +1927,31 @@ namespace OpenSim.Region.Framework.Scenes
             return true;
         }
 
+        public void RotateToLookAt(Vector3 lookAt)
+        {
+            if(ParentID == 0)
+            {
+                float n = lookAt.X * lookAt.X + lookAt.Y * lookAt.Y;
+                if(n < 0.0001f)
+                {
+                    Rotation = Quaternion.Identity;
+                    return;
+                }
+                n = lookAt.X/(float)Math.Sqrt(n);
+                float angle = (float)Math.Acos(n);
+                angle *= 0.5f;
+                float s = (float)Math.Sin(angle);
+                if(lookAt.Y < 0)
+                    s = -s;
+                Rotation = new Quaternion(
+                    0f,
+                    0f,
+                    s,
+                    (float)Math.Cos(angle)
+                    );
+            }
+        }
+
         /// <summary>
         /// Complete Avatar's movement into the region.
         /// </summary>
@@ -1963,10 +1988,10 @@ namespace OpenSim.Region.Framework.Scenes
                 bool flying = ((m_AgentControlFlags & AgentManager.ControlFlags.AGENT_CONTROL_FLY) != 0);
 
                 Vector3 look = Lookat;
+                look.Z = 0f;
                 if ((Math.Abs(look.X) < 0.01) && (Math.Abs(look.Y) < 0.01))
                 {
                     look = Velocity;
-                    look.Z = 0;
                     look.Normalize();
                     if ((Math.Abs(look.X) < 0.01) && (Math.Abs(look.Y) < 0.01) )
                         look = new Vector3(0.99f, 0.042f, 0);
@@ -2000,11 +2025,12 @@ namespace OpenSim.Region.Framework.Scenes
                     m_log.DebugFormat("[CompleteMovement]: Missing COF for {0} is {1}", client.AgentId, COF);
                 }
 
+                if(!gotCrossUpdate)
+                    RotateToLookAt(look);
 
                 // Tell the client that we're totally ready
                 ControllingClient.MoveAgentIntoRegion(m_scene.RegionInfo, AbsolutePosition, look);
 
-
                 m_log.DebugFormat("[CompleteMovement] MoveAgentIntoRegion: {0}ms", Util.EnvironmentTickCountSubtract(ts));
 
                 if (!string.IsNullOrEmpty(m_callbackURI))
-- 
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