Core/Movement: fixed up logic in previously added random movement minumum wander distance check and prevent the random movement generator from launching too short splines

src/server/game/Globals/ObjectMgr.cpp

@@ -2176,16 +2176,21 @@ void ObjectMgr::LoadCreatures()
             data.movementType = IDLE_MOTION_TYPE;
         }
 
-        if (data.wanderDistance < 0.1f)
+        if (data.wanderDistance < 0.0f)
+        {
+            TC_LOG_ERROR("sql.sql", "Table `creature` has creature (GUID: %u Entry: %u) with `wander_distance`< 0.0, set to 0.", guid, data.id);
+            data.wanderDistance = 0.0f;
+        }
+        else if (data.wanderDistance > 0.0f && data.wanderDistance < 0.1f)
         {
             TC_LOG_ERROR("sql.sql", "Table `creature` has creature (GUID: %u Entry: %u) with `wander_distance`< 0.1, set to 0.", guid, data.id);
             data.wanderDistance = 0.0f;
         }
         else if (data.movementType == RANDOM_MOTION_TYPE)
         {
-            if (G3D::fuzzyEq(data.wanderDistance, 0.1f))
+            if (G3D::fuzzyEq(data.wanderDistance, 0.0f))
             {
-                TC_LOG_ERROR("sql.sql", "Table `creature` has creature (GUID: %u Entry: %u) with `MovementType`= 1 (random movement) but with `wander_distance`= 0.1, replace by idle movement type (0).", guid, data.id);
+                TC_LOG_ERROR("sql.sql", "Table `creature` has creature (GUID: %u Entry: %u) with `MovementType`= 1 (random movement) but with `wander_distance`= 0, replace by idle movement type (0).", guid, data.id);
                 data.movementType = IDLE_MOTION_TYPE;
             }
         }

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

@@ -113,9 +113,15 @@ void RandomMovementGenerator<Creature>::SetRandomLocation(Creature* owner)
     owner->AddUnitState(UNIT_STATE_ROAMING_MOVE);
 
     Position position(_reference);
-    float distance = frand(0.1f, _wanderDistance);
+    float distance = _wanderDistance > 0.1f ? frand(0.1f, _wanderDistance) : _wanderDistance;
-    float angle = frand(0.f, float(M_PI * 2));
+    float angle = frand(0.f, static_cast<float>(M_PI * 2));
     owner->MovePositionToFirstCollision(position, distance, angle);
+    if (owner->GetPosition().GetExactDist(position) < 0.1f)
+    {
+        // the path is too short for the spline system to be accepted. Let's try again soon.
+        _timer.Reset(500);
+        return;
+    }
 
     if (!_path)
         _path = new PathGenerator(owner);