better hitnormal calc

based on documentation

/// If the hit parameter is zero, then the start position is on the wall that
/// was hit and the value of @p hitNormal is undefined.
///
/// If 0 < t < 1.0 then the following applies:
///
/// @code
/// distanceToHitBorder = distanceToEndPosition * t
/// hitPoint = startPos + (endPos - startPos) * t
/// @Endcode

Author: Gamemechanicwow

src/game/Maps/Map.cpp

@@ -3234,11 +3234,16 @@ bool Map::GetWalkHitPosition(GenericTransport* transport, float srcX, float srcY
         return false;
     }
 
+    if (t == 0)
+    {
+        return false;
+    }
+
     // We hit a wall - calculate new endposition
     if ((t < 1) && (t > 0))
     {
         for (int i = 0; i < 3; ++i)
-            endPosition[i] = point[i] + (endPosition[i] - point[i]) * hitNormal[i];
+            endPosition[i] = point[i] + (endPosition[i] - point[i]) * t;
     }
 
     if (dtStatusFailed(navMeshQuery->closestPointOnPoly(visited[visitedCount - 1], endPosition, endPosition, nullptr)))