Core/VMaps: Fix some vmap height edge cases

Fix Map::GetWaterOrGroundLevel() checking dynamic object only in phase 1 instead of current Unit phase.
Improve DynamicMapTree::getHeight() dynamic object check by casting the ray at +0.5f from the passed Z coordinate, this value will be tuned to improve even more the results.

(cherry picked from commit 1347d7cf7a8656f3db9d8b2f6e6d955e1fa8c129)

src/server/game/Entities/Object/Object.cpp

@@ -1899,7 +1899,7 @@ void WorldObject::UpdateAllowedPositionZ(float x, float y, float &z) const
                 bool canSwim = ToCreature()->CanSwim();
                 float ground_z = z;
                 float max_z = canSwim
-                    ? GetMap()->GetWaterOrGroundLevel(x, y, z, &ground_z, !ToUnit()->HasAuraType(SPELL_AURA_WATER_WALK))
+                    ? GetMap()->GetWaterOrGroundLevel(GetPhaseMask(), x, y, z, &ground_z, !ToUnit()->HasAuraType(SPELL_AURA_WATER_WALK))
                     : ((ground_z = GetMap()->GetHeight(GetPhaseMask(), x, y, z, true)));
                 if (max_z > INVALID_HEIGHT)
                 {
@@ -1923,7 +1923,7 @@ void WorldObject::UpdateAllowedPositionZ(float x, float y, float &z) const
             if (!ToPlayer()->CanFly())
             {
                 float ground_z = z;
-                float max_z = GetMap()->GetWaterOrGroundLevel(x, y, z, &ground_z, !ToUnit()->HasAuraType(SPELL_AURA_WATER_WALK));
+                float max_z = GetMap()->GetWaterOrGroundLevel(GetPhaseMask(), x, y, z, &ground_z, !ToUnit()->HasAuraType(SPELL_AURA_WATER_WALK));
                 if (max_z > INVALID_HEIGHT)
                 {
                     if (z > max_z)

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

@@ -14816,7 +14816,7 @@ void Unit::_ExitVehicle(Position const* exitPosition)
     Movement::MoveSplineInit init(this);
 
     // Creatures without inhabit type air should begin falling after exiting the vehicle
-    if (GetTypeId() == TYPEID_UNIT && !CanFly() && height > GetMap()->GetWaterOrGroundLevel(pos.GetPositionX(), pos.GetPositionY(), pos.GetPositionZ(), &height) + 0.1f)
+    if (GetTypeId() == TYPEID_UNIT && !CanFly() && height > GetMap()->GetWaterOrGroundLevel(GetPhaseMask(), pos.GetPositionX(), pos.GetPositionY(), pos.GetPositionZ(), &height) + 0.1f)
         init.SetFall();
 
     init.MoveTo(pos.GetPositionX(), pos.GetPositionY(), height, false);

src/server/game/Maps/Map.cpp

@@ -2304,12 +2304,12 @@ inline GridMap* Map::GetGrid(float x, float y)
     return GridMaps[gx][gy];
 }
 
-float Map::GetWaterOrGroundLevel(float x, float y, float z, float* ground /*= NULL*/, bool /*swim = false*/) const
+float Map::GetWaterOrGroundLevel(uint32 phasemask, float x, float y, float z, float* ground /*= NULL*/, bool /*swim = false*/) const
 {
     if (const_cast<Map*>(this)->GetGrid(x, y))
     {
         // we need ground level (including grid height version) for proper return water level in point
-        float ground_z = GetHeight(PHASEMASK_NORMAL, x, y, z, true, 50.0f);
+        float ground_z = GetHeight(phasemask, x, y, z, true, 50.0f);
         if (ground)
             *ground = ground_z;
 

src/server/game/Maps/Map.h

@@ -498,7 +498,7 @@ class TC_GAME_API Map : public GridRefManager<NGridType>
         BattlegroundMap* ToBattlegroundMap() { if (IsBattlegroundOrArena()) return reinterpret_cast<BattlegroundMap*>(this); else return NULL;  }
         BattlegroundMap const* ToBattlegroundMap() const { if (IsBattlegroundOrArena()) return reinterpret_cast<BattlegroundMap const*>(this); return NULL; }
 
-        float GetWaterOrGroundLevel(float x, float y, float z, float* ground = NULL, bool swim = false) const;
+        float GetWaterOrGroundLevel(uint32 phasemask, float x, float y, float z, float* ground = NULL, bool swim = false) const;
         float GetHeight(uint32 phasemask, float x, float y, float z, bool vmap = true, float maxSearchDist = DEFAULT_HEIGHT_SEARCH) const;
         bool isInLineOfSight(float x1, float y1, float z1, float x2, float y2, float z2, uint32 phasemask) const;
         void Balance() { _dynamicTree.balance(); }

src/server/game/Movement/MovementGenerators/RandomMovementGenerator.cpp

@@ -57,7 +57,7 @@ void RandomMovementGenerator<Creature>::_setRandomLocation(Creature* creature)
         // Limit height change
         const float distanceZ = float(rand_norm()) * travelDistZ/2.0f;
         destZ = respZ + distanceZ;
-        float levelZ = map->GetWaterOrGroundLevel(destX, destY, destZ-2.5f);
+        float levelZ = map->GetWaterOrGroundLevel(creature->GetPhaseMask(), destX, destY, destZ-2.5f);
 
         // Problem here, we must fly above the ground and water, not under. Let's try on next tick
         if (levelZ >= destZ)

src/server/scripts/Northrend/zone_sholazar_basin.cpp

@@ -779,7 +779,7 @@ public:
 
                         bird->KillSelf();
                         crunchy->GetMotionMaster()->MovePoint(0, bird->GetPositionX(), bird->GetPositionY(),
-                            bird->GetMap()->GetWaterOrGroundLevel(bird->GetPositionX(), bird->GetPositionY(), bird->GetPositionZ()));
+                            bird->GetMap()->GetWaterOrGroundLevel(bird->GetPhaseMask(), bird->GetPositionX(), bird->GetPositionY(), bird->GetPositionZ()));
                         /// @todo Make crunchy perform emote eat when he reaches the bird
 
                         break;