Core/MMaps: Fix charge underwater/falling (#24010)

* Core/MMaps: Fix charge underwater

Fix charge sometimes returning "no path available" when swimming/underwater.
Fix charge selecting a destination point 4 yards above swimming/underwater targets

* Allow falling units to charge targets that are below (lower Z coordinate)

* Disable "raycast" pathfinding as it's not blizzlike.

This might show some strange paths when charging with a target in front.
It also fixes some falling undermap issues.

This Reverts 272009ebee

* Remove Z offset when charging a target as it never made sense

src/server/game/Movement/PathGenerator.cpp

@@ -206,23 +206,22 @@ void PathGenerator::BuildPolyPath(G3D::Vector3 const& startPos, G3D::Vector3 con
         TC_LOG_DEBUG("maps.mmaps", "++ BuildPolyPath :: farFromPoly distToStartPoly=%.3f distToEndPoly=%.3f", distToStartPoly, distToEndPoly);
 
         bool buildShotrcut = false;
-        if (_sourceUnit->GetTypeId() == TYPEID_UNIT)
-        {
-            Creature* owner = (Creature*)_sourceUnit;
 
         G3D::Vector3 const& p = (distToStartPoly > 7.0f) ? startPos : endPos;
         if (_sourceUnit->GetMap()->IsUnderWater(_sourceUnit->GetPhaseShift(), p.x, p.y, p.z))
         {
             TC_LOG_DEBUG("maps.mmaps", "++ BuildPolyPath :: underWater case");
-                if (owner->CanSwim())
+            if (_sourceUnit->CanSwim())
                 buildShotrcut = true;
         }
         else
         {
             TC_LOG_DEBUG("maps.mmaps", "++ BuildPolyPath :: flying case");
-                if (owner->CanFly())
+            if (_sourceUnit->CanFly())
+                buildShotrcut = true;
+            // Allow to build a shortcut if the unit is falling and it's trying to move downwards towards a target (i.e. charging)
+            else if (_sourceUnit->IsFalling() && endPos.z < startPos.z)
                 buildShotrcut = true;
-            }
         }
 
         if (buildShotrcut)

src/server/game/Spells/Spell.cpp

@@ -5710,23 +5710,15 @@ SpellCastResult Spell::CheckCast(bool strict, uint32* param1 /*= nullptr*/, uint
 
                     m_preGeneratedPath = Trinity::make_unique<PathGenerator>(m_caster);
                     m_preGeneratedPath->SetPathLengthLimit(range);
+
                     // first try with raycast, if it fails fall back to normal path
-                    float targetObjectSize = std::min(target->GetCombatReach(), 4.0f);
+                    bool result = m_preGeneratedPath->CalculatePath(target->GetPositionX(), target->GetPositionY(), target->GetPositionZ(), false, false);
-                    bool result = m_preGeneratedPath->CalculatePath(target->GetPositionX(), target->GetPositionY(), target->GetPositionZ() + targetObjectSize, false, true);
-                    if (m_preGeneratedPath->GetPathType() & PATHFIND_SHORT)
-                        return SPELL_FAILED_OUT_OF_RANGE;
-                    else if (!result || m_preGeneratedPath->GetPathType() & (PATHFIND_NOPATH | PATHFIND_INCOMPLETE))
-                    {
-                        result = m_preGeneratedPath->CalculatePath(target->GetPositionX(), target->GetPositionY(), target->GetPositionZ() + targetObjectSize, false, false);
                     if (m_preGeneratedPath->GetPathType() & PATHFIND_SHORT)
                         return SPELL_FAILED_OUT_OF_RANGE;
                     else if (!result || m_preGeneratedPath->GetPathType() & (PATHFIND_NOPATH | PATHFIND_INCOMPLETE))
                         return SPELL_FAILED_NOPATH;
                     else if (m_preGeneratedPath->IsInvalidDestinationZ(target)) // Check position z, if not in a straight line
                         return SPELL_FAILED_NOPATH;
-                    }
-                    else if (m_preGeneratedPath->IsInvalidDestinationZ(target)) // Check position z, if in a straight line
-                            return SPELL_FAILED_NOPATH;
 
                     m_preGeneratedPath->ShortenPathUntilDist(PositionToVector3(target), objSize); // move back
                 }