From 2de29ff861bc6a5b636c18d10a1e7b886935444e Mon Sep 17 00:00:00 2001
From: ratkosrb <ratkomladic2@abv.bg>
Date: Wed, 25 May 2022 12:58:56 +0300
Subject: [PATCH] Manually set collision height when mounting.

---
 .../Client/PacketHandlers/UpdateHandler.cs    | 11 +++++++++
 .../World/Server/Packets/MovementPackets.cs   | 24 +++++++++++++++++++
 2 files changed, 35 insertions(+)

diff --git a/HermesProxy/World/Client/PacketHandlers/UpdateHandler.cs b/HermesProxy/World/Client/PacketHandlers/UpdateHandler.cs
index 1616e3ac..455fb695 100644
--- a/HermesProxy/World/Client/PacketHandlers/UpdateHandler.cs
+++ b/HermesProxy/World/Client/PacketHandlers/UpdateHandler.cs
@@ -1597,6 +1597,17 @@ public void StoreObjectUpdate(WowGuid128 guid, ObjectType objectType, BitArray u
                 if (UNIT_FIELD_MOUNTDISPLAYID >= 0 && updateMaskArray[UNIT_FIELD_MOUNTDISPLAYID])
                 {
                     updateData.UnitData.MountDisplayID = updates[UNIT_FIELD_MOUNTDISPLAYID].Int32Value;
+
+                    if (!isCreate && guid == GetSession().GameState.CurrentPlayerGuid &&
+                        LegacyVersion.RemovedInVersion(ClientVersionBuild.V3_0_2_9056))
+                    {
+                        MoveSetCollisionHeight height = new();
+                        height.MoverGUID = guid;
+                        height.Height = updateData.UnitData.MountDisplayID != 0 ? 3.081099f : 2.438083f;
+                        height.MountDisplayID = (uint)updateData.UnitData.MountDisplayID;
+                        height.Reason = 1; // Mount
+                        SendPacketToClient(height);
+                    }
                 }
                 int UNIT_FIELD_MINDAMAGE = LegacyVersion.GetUpdateField(UnitField.UNIT_FIELD_MINDAMAGE);
                 if (UNIT_FIELD_MINDAMAGE >= 0 && updateMaskArray[UNIT_FIELD_MINDAMAGE])
diff --git a/HermesProxy/World/Server/Packets/MovementPackets.cs b/HermesProxy/World/Server/Packets/MovementPackets.cs
index e06c0649..69ced884 100644
--- a/HermesProxy/World/Server/Packets/MovementPackets.cs
+++ b/HermesProxy/World/Server/Packets/MovementPackets.cs
@@ -415,6 +415,30 @@ public override void Read()
         public MovementAck Ack;
     }
 
+    class MoveSetCollisionHeight : ServerPacket
+    {
+        public MoveSetCollisionHeight() : base(Opcode.SMSG_MOVE_SET_COLLISION_HEIGHT) { }
+
+        public override void Write()
+        {
+            _worldPacket.WritePackedGuid128(MoverGUID);
+            _worldPacket.WriteUInt32(SequenceIndex);
+            _worldPacket.WriteFloat(Height);
+            _worldPacket.WriteFloat(Scale);
+            _worldPacket.WriteUInt8(Reason);
+            _worldPacket.WriteUInt32(MountDisplayID);
+            _worldPacket.WriteInt32(ScaleDuration);
+        }
+        
+        public WowGuid128 MoverGUID;
+        public uint SequenceIndex = 1;
+        public float Height = 1.0f;
+        public float Scale = 1.0f;
+        public byte Reason;
+        public uint MountDisplayID;
+        public int ScaleDuration = 2000;
+    }
+
     class MoveKnockBack : ServerPacket
     {
         public MoveKnockBack() : base(Opcode.SMSG_MOVE_KNOCK_BACK, ConnectionType.Instance) { }