diff --git a/src/DotRecast.Recast.Demo/Tools/TileTool.cs b/src/DotRecast.Recast.Demo/Tools/TileTool.cs
index a106594..390a5b8 100644
--- a/src/DotRecast.Recast.Demo/Tools/TileTool.cs
+++ b/src/DotRecast.Recast.Demo/Tools/TileTool.cs
@@ -4,6 +4,7 @@ using DotRecast.Recast.Demo.Draw;
 using DotRecast.Recast.DemoTool;
 using DotRecast.Recast.DemoTool.Tools;
 using ImGuiNET;
+using Silk.NET.Vulkan;
 using static DotRecast.Recast.Demo.Draw.DebugDraw;
 using static DotRecast.Recast.Demo.Draw.DebugDrawPrimitives;
 
@@ -64,19 +65,29 @@ public class TileTool : IRcTool
 
     public void HandleRender(NavMeshRenderer renderer)
     {
+        var dd = renderer.GetDebugDraw();
         if (_hitPosSet)
         {
-            RecastDebugDraw dd = renderer.GetDebugDraw();
             var s = _impl.GetSample().GetSettings().agentRadius;
             dd.Begin(LINES, 2.0f);
-            dd.Vertex(_hitPos[0] - s, _hitPos[1] + 0.1f, _hitPos[2], DuRGBA(0, 0, 0, 128));
-            dd.Vertex(_hitPos[0] + s, _hitPos[1] + 0.1f, _hitPos[2], DuRGBA(0, 0, 0, 128));
-            dd.Vertex(_hitPos[0], _hitPos[1] - s + 0.1f, _hitPos[2], DuRGBA(0, 0, 0, 128));
-            dd.Vertex(_hitPos[0], _hitPos[1] + s + 0.1f, _hitPos[2], DuRGBA(0, 0, 0, 128));
-            dd.Vertex(_hitPos[0], _hitPos[1] + 0.1f, _hitPos[2] - s, DuRGBA(0, 0, 0, 128));
-            dd.Vertex(_hitPos[0], _hitPos[1] + 0.1f, _hitPos[2] + s, DuRGBA(0, 0, 0, 128));
+            dd.Vertex(_hitPos.x - s, _hitPos.y + 0.1f, _hitPos.z, DuRGBA(0, 0, 0, 128));
+            dd.Vertex(_hitPos.x + s, _hitPos.y + 0.1f, _hitPos.z, DuRGBA(0, 0, 0, 128));
+            dd.Vertex(_hitPos.x, _hitPos.y - s + 0.1f, _hitPos.z, DuRGBA(0, 0, 0, 128));
+            dd.Vertex(_hitPos.x, _hitPos.y + s + 0.1f, _hitPos.z, DuRGBA(0, 0, 0, 128));
+            dd.Vertex(_hitPos.x, _hitPos.y + 0.1f, _hitPos.z - s, DuRGBA(0, 0, 0, 128));
+            dd.Vertex(_hitPos.x, _hitPos.y + 0.1f, _hitPos.z + s, DuRGBA(0, 0, 0, 128));
             dd.End();
         }
+
+        if (_hitPosSet)
+        {
+            RcVec3f m_lastBuiltTileBmin = _hitPos - RcVec3f.One;
+            RcVec3f m_lastBuiltTileBmax = _hitPos + RcVec3f.One;
+            dd.DebugDrawBoxWire(
+                m_lastBuiltTileBmin.x, m_lastBuiltTileBmin.y, m_lastBuiltTileBmin.z,
+                m_lastBuiltTileBmax.x, m_lastBuiltTileBmax.y, m_lastBuiltTileBmax.z,
+                DuRGBA(255, 255, 255, 64), 1.0f);
+        }
     }
 
     public void HandleUpdate(float dt)