diff --git a/src/DotRecast.Recast.Demo/Draw/DebugDraw.cs b/src/DotRecast.Recast.Demo/Draw/DebugDraw.cs
index 994ea96..2b7c661 100644
--- a/src/DotRecast.Recast.Demo/Draw/DebugDraw.cs
+++ b/src/DotRecast.Recast.Demo/Draw/DebugDraw.cs
@@ -111,6 +111,23 @@ public class DebugDraw
         End();
     }
 
+    public void DebugDrawGridXZ(float ox, float oy, float oz, int w, int h, float size, int col, float lineWidth)
+    {
+        Begin(DebugDrawPrimitives.LINES, lineWidth);
+        for (int i = 0; i <= h; ++i)
+        {
+            Vertex(ox,oy,oz+i*size, col);
+            Vertex(ox+w*size,oy,oz+i*size, col);
+        }
+        for (int i = 0; i <= w; ++i)
+        {
+            Vertex(ox+i*size,oy,oz, col);
+            Vertex(ox+i*size,oy,oz+h*size, col);
+        }
+        End();
+    }
+
+
     public void AppendBoxWire(float minx, float miny, float minz, float maxx, float maxy, float maxz, int col)
     {
         // Top
@@ -189,7 +206,7 @@ public class DebugDraw
     {
         GetOpenGlDraw().Vertex(pos, color);
     }
-    
+
     public void Vertex(RcVec3f pos, int color)
     {
         GetOpenGlDraw().Vertex(pos, color);
@@ -703,4 +720,4 @@ public class DebugDraw
     {
         return FrustumTest(new float[] { bmin.x, bmin.y, bmin.z, bmax.x, bmax.y, bmax.z });
     }
-}
+}
\ No newline at end of file
diff --git a/src/DotRecast.Recast.Demo/Draw/NavMeshRenderer.cs b/src/DotRecast.Recast.Demo/Draw/NavMeshRenderer.cs
index a6ad7fc..50f1560 100644
--- a/src/DotRecast.Recast.Demo/Draw/NavMeshRenderer.cs
+++ b/src/DotRecast.Recast.Demo/Draw/NavMeshRenderer.cs
@@ -19,6 +19,7 @@ freely, subject to the following restrictions:
 */
 
 using System.Collections.Generic;
+using System.Diagnostics.Tracing;
 using DotRecast.Core;
 using DotRecast.Detour;
 using DotRecast.Recast.DemoTool.Builder;
@@ -78,6 +79,18 @@ public class NavMeshRenderer
             DrawGeomBounds(geom);
         }
 
+        if (geom != null && settings.tiled)
+        {
+            int gw = 0, gh = 0;
+            RcVec3f bmin = geom.GetMeshBoundsMin();
+            RcVec3f bmax = geom.GetMeshBoundsMax();
+            Recast.CalcGridSize(bmin, bmax, settings.cellSize, out gw, out gh);
+            int tw = (gw + settings.tileSize - 1) / settings.tileSize;
+            int th = (gh + settings.tileSize - 1) / settings.tileSize;
+            float s = settings.tileSize * settings.cellSize;
+            _debugDraw.DebugDrawGridXZ(bmin[0], bmin[1], bmin[2], tw, th, s, DebugDraw.DuRGBA(0, 0, 0, 64), 1.0f);
+        }
+
         if (navMesh != null && navQuery != null
                             && (drawMode == DrawMode.DRAWMODE_NAVMESH
                                 || drawMode == DrawMode.DRAWMODE_NAVMESH_TRANS
@@ -104,8 +117,7 @@ public class NavMeshRenderer
             if (drawMode == DrawMode.DRAWMODE_NAVMESH_NODES)
             {
                 _debugDraw.DebugDrawNavMeshNodes(navQuery);
-                _debugDraw.DebugDrawNavMeshPolysWithFlags(navMesh, SampleAreaModifications.SAMPLE_POLYFLAGS_DISABLED,
-                    DebugDraw.DuRGBA(0, 0, 0, 128));
+                _debugDraw.DebugDrawNavMeshPolysWithFlags(navMesh, SampleAreaModifications.SAMPLE_POLYFLAGS_DISABLED, DebugDraw.DuRGBA(0, 0, 0, 128));
             }
         }
 
diff --git a/src/DotRecast.Recast.Demo/Tools/TileTool.cs b/src/DotRecast.Recast.Demo/Tools/TileTool.cs
index 56a5acb..a106594 100644
--- a/src/DotRecast.Recast.Demo/Tools/TileTool.cs
+++ b/src/DotRecast.Recast.Demo/Tools/TileTool.cs
@@ -1,7 +1,11 @@
-using DotRecast.Core;
+using System.Reflection.Metadata;
+using DotRecast.Core;
 using DotRecast.Recast.Demo.Draw;
 using DotRecast.Recast.DemoTool;
 using DotRecast.Recast.DemoTool.Tools;
+using ImGuiNET;
+using static DotRecast.Recast.Demo.Draw.DebugDraw;
+using static DotRecast.Recast.Demo.Draw.DebugDrawPrimitives;
 
 namespace DotRecast.Recast.Demo.Tools;
 
@@ -9,6 +13,9 @@ public class TileTool : IRcTool
 {
     private readonly TileToolImpl _impl;
 
+    private bool _hitPosSet;
+    private RcVec3f _hitPos;
+
     public TileTool()
     {
         _impl = new();
@@ -25,14 +32,51 @@ public class TileTool : IRcTool
 
     public void Layout()
     {
+        if (ImGui.Button("Create All Tile"))
+        {
+            // if (m_sample)
+            //     m_sample->buildAllTiles();
+        }
+
+        if (ImGui.Button("Remove All Tile"))
+        {
+            // if (m_sample)
+            //     m_sample->removeAllTiles();
+        }
     }
 
     public void HandleClick(RcVec3f s, RcVec3f p, bool shift)
     {
+        _hitPosSet = true;
+        _hitPos = p;
+
+        var sample = _impl.GetSample();
+        if (null != sample)
+        {
+            if (shift)
+            {
+            }
+            else
+            {
+            }
+        }
     }
 
     public void HandleRender(NavMeshRenderer renderer)
     {
+        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.End();
+        }
     }
 
     public void HandleUpdate(float dt)