Core/Units: Second part of SMSG_MOVE_SET_COLLISION_HGT implementation: compute proper collision height according to client formulae and send this to the client when mounting up.

src/server/game/DataStores/DBCStructure.h

@@ -760,7 +760,7 @@ struct CreatureModelDataEntry
     //uint32 Flags;
     //char* ModelPath[16]
     //uint32 Unk1;
-    //float Scale;                                           // Used in calculation of unit collision data
+    float Scale;                                             // Used in calculation of unit collision data
     //int32 Unk2
     //int32 Unk3
     //uint32 Unk4
@@ -770,9 +770,9 @@ struct CreatureModelDataEntry
     //float Unk8
     //uint32 Unk9
     //uint32 Unk10
-    float CollisionWidth;
+    //float CollisionWidth;
     float CollisionHeight;
-    //float Unk11;                                            // Used in calculation of unit collision data when mounted
+    float MountHeight;                                       // Used in calculation of unit collision data when mounted
     //float Unks[11]
 };
 

src/server/game/DataStores/DBCfmt.h

@@ -40,7 +40,7 @@ const char ChrRacesEntryfmt[]="nxixiixixxxxixssssssssssssssssxxxxxxxxxxxxxxxxxxx
 const char CinematicSequencesEntryfmt[]="nxxxxxxxxx";
 const char CreatureDisplayInfofmt[]="nixxfxxxxxxxxxxx";
 const char CreatureFamilyfmt[]="nfifiiiiixssssssssssssssssxx";
-const char CreatureModelDatafmt[]="nxxxxxxxxxxxxxffxxxxxxxxxxxx";
+const char CreatureModelDatafmt[]="nxxxfxxxxxxxxxxffxxxxxxxxxxx";
 const char CreatureSpellDatafmt[]="niiiixxxx";
 const char CreatureTypefmt[]="nxxxxxxxxxxxxxxxxxx";
 const char CurrencyTypesfmt[]="xnxi";

src/server/game/Entities/Player/Player.h

@@ -2494,16 +2494,37 @@ class Player : public Unit, public GridObject<Player>
         bool IsInWhisperWhiteList(uint64 guid);
 
         //! Return collision height sent to client
-        //! we currently only send this on dismount
-        float GetCollisionHeight()
+        float GetCollisionHeight(bool mounted)
         {
+            if (mounted)
+            {
+                CreatureDisplayInfoEntry const* mountDisplayInfo = sCreatureDisplayInfoStore.LookupEntry(GetUInt32Value(UNIT_FIELD_MOUNTDISPLAYID));
+                if (!mountDisplayInfo)
+                    return GetCollisionHeight(false);
+                    
+                CreatureModelDataEntry const* mountModelData = sCreatureModelDataStore.LookupEntry(mountDisplayInfo->ModelId);
+                if (!mountModelData)
+                    return GetCollisionHeight(false);
+
+                CreatureDisplayInfoEntry const* displayInfo = sCreatureDisplayInfoStore.LookupEntry(GetNativeDisplayId());
+                ASSERT(displayInfo);
+                CreatureModelDataEntry const* modelData = sCreatureModelDataStore.LookupEntry(displayInfo->ModelId);
+                ASSERT(modelData);
+
+                float scaleMod = GetFloatValue(OBJECT_FIELD_SCALE_X); // 99% sure about this
+
+                return scaleMod * mountModelData->MountHeight + modelData->CollisionHeight * 0.5f;
+            }
+            else
+            {
+                //! Dismounting case - use basic default model data
                 CreatureDisplayInfoEntry const* displayInfo = sCreatureDisplayInfoStore.LookupEntry(GetNativeDisplayId());
                 ASSERT(displayInfo);
                 CreatureModelDataEntry const* modelData = sCreatureModelDataStore.LookupEntry(displayInfo->ModelId);
                 ASSERT(modelData);
 
                 return modelData->CollisionHeight;
-
+            }
             //! TODO: Need a proper calculation for collision height when mounted
         }
 

src/server/game/Entities/Unit/Unit.cpp

@@ -11934,6 +11934,12 @@ void Unit::Mount(uint32 mount, uint32 VehicleId, uint32 creatureEntry)
             else
                 player->UnsummonPetTemporaryIfAny();
         }
+
+        WorldPacket data(SMSG_MOVE_SET_COLLISION_HGT, GetPackGUID().size() + 4 + 4);
+        data.append(GetPackGUID());
+        data << uint32(sWorld->GetGameTime());   // Packet counter
+        data << player->GetCollisionHeight(true);
+        player->GetSession()->SendPacket(&data);
     }
 
     RemoveAurasWithInterruptFlags(AURA_INTERRUPT_FLAG_MOUNT);
@@ -11952,7 +11958,7 @@ void Unit::Unmount()
         WorldPacket data(SMSG_MOVE_SET_COLLISION_HGT, GetPackGUID().size() + 4 + 4);
         data.append(GetPackGUID());
         data << uint32(sWorld->GetGameTime());   // Packet counter
-        data << thisPlayer->GetCollisionHeight();
+        data << thisPlayer->GetCollisionHeight(false);
         thisPlayer->GetSession()->SendPacket(&data);
     }