diff --git a/src/DotRecast.Recast.Demo/Draw/NavMeshRenderer.cs b/src/DotRecast.Recast.Demo/Draw/NavMeshRenderer.cs
index 869c089..c4e9d25 100644
--- a/src/DotRecast.Recast.Demo/Draw/NavMeshRenderer.cs
+++ b/src/DotRecast.Recast.Demo/Draw/NavMeshRenderer.cs
@@ -304,4 +304,4 @@ public class NavMeshRenderer
 
         debugDraw.DepthMask(true);
     }
-}
+}
\ No newline at end of file
diff --git a/src/DotRecast.Recast.Demo/RecastDemo.cs b/src/DotRecast.Recast.Demo/RecastDemo.cs
index 7b9490b..787131a 100644
--- a/src/DotRecast.Recast.Demo/RecastDemo.cs
+++ b/src/DotRecast.Recast.Demo/RecastDemo.cs
@@ -602,7 +602,7 @@ public class RecastDemo
                 }
 
                 RcVec3f rayDir = RcVec3f.Of(rayEnd.x - rayStart.x, rayEnd.y - rayStart.y, rayEnd.z - rayStart.z);
-                Tool rayTool = toolsUI.GetTool();
+                ITool rayTool = toolsUI.GetTool();
                 rayDir.Normalize();
                 if (rayTool != null)
                 {
@@ -727,7 +727,7 @@ public class RecastDemo
 
         dd.Fog(camr * 0.1f, camr * 1.25f);
         renderer.Render(sample);
-        Tool tool = toolsUI.GetTool();
+        ITool tool = toolsUI.GetTool();
         if (tool != null)
         {
             tool.HandleRender(renderer);
diff --git a/src/DotRecast.Recast.Demo/Tools/ConvexVolumeTool.cs b/src/DotRecast.Recast.Demo/Tools/ConvexVolumeTool.cs
index 86b42ec..d4cde1f 100644
--- a/src/DotRecast.Recast.Demo/Tools/ConvexVolumeTool.cs
+++ b/src/DotRecast.Recast.Demo/Tools/ConvexVolumeTool.cs
@@ -30,7 +30,7 @@ using static DotRecast.Recast.Demo.Draw.DebugDrawPrimitives;
 
 namespace DotRecast.Recast.Demo.Tools;
 
-public class ConvexVolumeTool : Tool
+public class ConvexVolumeTool : ITool
 {
     private Sample sample;
     private int areaTypeValue = SampleAreaModifications.SAMPLE_AREAMOD_GRASS.Value;
@@ -41,12 +41,12 @@ public class ConvexVolumeTool : Tool
     private readonly List<float> pts = new();
     private readonly List<int> hull = new();
 
-    public override void SetSample(Sample m_sample)
+    public void SetSample(Sample m_sample)
     {
         sample = m_sample;
     }
 
-    public override void HandleClick(RcVec3f s, RcVec3f p, bool shift)
+    public void HandleClick(RcVec3f s, RcVec3f p, bool shift)
     {
         DemoInputGeomProvider geom = sample.GetInputGeom();
         if (geom == null)
@@ -139,7 +139,7 @@ public class ConvexVolumeTool : Tool
         }
     }
 
-    public override void HandleRender(NavMeshRenderer renderer)
+    public void HandleRender(NavMeshRenderer renderer)
     {
         RecastDebugDraw dd = renderer.GetDebugDraw();
         // Find height extent of the shape.
@@ -182,7 +182,7 @@ public class ConvexVolumeTool : Tool
         dd.End();
     }
 
-    public override void Layout()
+    public void Layout()
     {
         ImGui.SliderFloat("Shape Height", ref boxHeight, 0.1f, 20f, "%.1f");
         ImGui.SliderFloat("Shape Descent", ref boxDescent, 0.1f, 20f, "%.1f");
@@ -224,13 +224,19 @@ public class ConvexVolumeTool : Tool
         }
     }
 
-    public override string GetName()
+    public string GetName()
     {
         return "Create Convex Volumes";
     }
 
-    public override void HandleUpdate(float dt)
+    public void HandleUpdate(float dt)
     {
         // TODO Auto-generated method stub
     }
+    
+    public void HandleClickRay(RcVec3f start, RcVec3f direction, bool shift)
+    {
+
+    }
+
 }
\ No newline at end of file
diff --git a/src/DotRecast.Recast.Demo/Tools/CrowdTool.cs b/src/DotRecast.Recast.Demo/Tools/CrowdTool.cs
index 1c06d1a..c67b63f 100644
--- a/src/DotRecast.Recast.Demo/Tools/CrowdTool.cs
+++ b/src/DotRecast.Recast.Demo/Tools/CrowdTool.cs
@@ -34,7 +34,7 @@ using static DotRecast.Recast.Demo.Draw.DebugDrawPrimitives;
 
 namespace DotRecast.Recast.Demo.Tools;
 
-public class CrowdTool : Tool
+public class CrowdTool : ITool
 {
     private readonly CrowdToolParams toolParams = new CrowdToolParams();
     private Sample sample;
@@ -56,7 +56,7 @@ public class CrowdTool : Tool
         profilingTool = new CrowdProfilingTool(GetAgentParams);
     }
 
-    public override void SetSample(Sample psample)
+    public void SetSample(Sample psample)
     {
         if (sample != psample)
         {
@@ -111,7 +111,7 @@ public class CrowdTool : Tool
         }
     }
 
-    public override void HandleClick(RcVec3f s, RcVec3f p, bool shift)
+    public void HandleClick(RcVec3f s, RcVec3f p, bool shift)
     {
         if (m_mode == CrowdToolMode.PROFILING)
         {
@@ -313,7 +313,7 @@ public class CrowdTool : Tool
         return vel.Scale(speed);
     }
 
-    public override void HandleRender(NavMeshRenderer renderer)
+    public void HandleRender(NavMeshRenderer renderer)
     {
         if (m_mode == CrowdToolMode.PROFILING)
         {
@@ -620,7 +620,7 @@ public class CrowdTool : Tool
         dd.DepthMask(true);
     }
 
-    public override void HandleUpdate(float dt)
+    public void HandleUpdate(float dt)
     {
         UpdateTick(dt);
     }
@@ -665,7 +665,7 @@ public class CrowdTool : Tool
         m_agentDebug.agent = agent;
     }
 
-    public override void Layout()
+    public void Layout()
     {
         ImGui.Text($"Crowd Tool Mode");
         ImGui.Separator();
@@ -794,8 +794,14 @@ public class CrowdTool : Tool
         return updateFlags;
     }
 
-    public override string GetName()
+    public string GetName()
     {
         return "Crowd";
     }
+    
+    public void HandleClickRay(RcVec3f start, RcVec3f direction, bool shift)
+    {
+
+    }
+
 }
\ No newline at end of file
diff --git a/src/DotRecast.Recast.Demo/Tools/DynamicUpdateTool.cs b/src/DotRecast.Recast.Demo/Tools/DynamicUpdateTool.cs
index 02fa2c5..4e826f9 100644
--- a/src/DotRecast.Recast.Demo/Tools/DynamicUpdateTool.cs
+++ b/src/DotRecast.Recast.Demo/Tools/DynamicUpdateTool.cs
@@ -37,7 +37,7 @@ using static DotRecast.Recast.Demo.Draw.DebugDrawPrimitives;
 
 namespace DotRecast.Recast.Demo.Tools;
 
-public class DynamicUpdateTool : Tool
+public class DynamicUpdateTool : ITool
 {
     private Sample sample;
     private int toolModeIdx = DynamicUpdateToolMode.BUILD.Idx;
@@ -92,12 +92,12 @@ public class DynamicUpdateTool : Tool
         convexGeom = DemoObjImporter.Load(Loader.ToBytes("convex.obj"));
     }
 
-    public override void SetSample(Sample sample)
+    public void SetSample(Sample sample)
     {
         this.sample = sample;
     }
 
-    public override void HandleClick(RcVec3f s, RcVec3f p, bool shift)
+    public void HandleClick(RcVec3f s, RcVec3f p, bool shift)
     {
         if (mode == DynamicUpdateToolMode.COLLIDERS)
         {
@@ -342,7 +342,7 @@ public class DynamicUpdateTool : Tool
     }
 
 
-    public override void HandleClickRay(RcVec3f start, RcVec3f dir, bool shift)
+    public void HandleClickRay(RcVec3f start, RcVec3f dir, bool shift)
     {
         if (mode == DynamicUpdateToolMode.COLLIDERS)
         {
@@ -390,7 +390,7 @@ public class DynamicUpdateTool : Tool
         return disc >= 0.0f;
     }
 
-    public override void HandleRender(NavMeshRenderer renderer)
+    public void HandleRender(NavMeshRenderer renderer)
     {
         if (mode == DynamicUpdateToolMode.COLLIDERS)
         {
@@ -450,7 +450,7 @@ public class DynamicUpdateTool : Tool
         dd.DepthMask(true);
     }
 
-    public override void HandleUpdate(float dt)
+    public void HandleUpdate(float dt)
     {
         if (dynaMesh != null)
         {
@@ -477,7 +477,7 @@ public class DynamicUpdateTool : Tool
         }
     }
 
-    public override void Layout()
+    public void Layout()
     {
         ImGui.Text($"Dynamic Update Tool Modes");
         ImGui.Separator();
@@ -744,7 +744,7 @@ public class DynamicUpdateTool : Tool
         filterWalkableLowHeightSpans = dynaMesh.config.filterWalkableLowHeightSpans;
     }
 
-    public override string GetName()
+    public string GetName()
     {
         return "Dynamic Updates";
     }
diff --git a/src/DotRecast.Recast.Demo/Tools/Tool.cs b/src/DotRecast.Recast.Demo/Tools/ITool.cs
similarity index 70%
rename from src/DotRecast.Recast.Demo/Tools/Tool.cs
rename to src/DotRecast.Recast.Demo/Tools/ITool.cs
index 76dd86c..27b4f58 100644
--- a/src/DotRecast.Recast.Demo/Tools/Tool.cs
+++ b/src/DotRecast.Recast.Demo/Tools/ITool.cs
@@ -23,21 +23,18 @@ using DotRecast.Recast.Demo.Draw;
 
 namespace DotRecast.Recast.Demo.Tools;
 
-public abstract class Tool
+public interface ITool
 {
-    public abstract string GetName();
-    public abstract void Layout();
+    string GetName();
+    void Layout();
 
-    public abstract void SetSample(Sample m_sample);
+    void SetSample(Sample m_sample);
 
-    public abstract void HandleClick(RcVec3f s, RcVec3f p, bool shift);
+    void HandleClick(RcVec3f s, RcVec3f p, bool shift);
 
-    public abstract void HandleRender(NavMeshRenderer renderer);
+    void HandleRender(NavMeshRenderer renderer);
 
-    public abstract void HandleUpdate(float dt);
+    void HandleUpdate(float dt);
 
-    public virtual void HandleClickRay(RcVec3f start, RcVec3f direction, bool shift)
-    {
-        // ...
-    }
+    void HandleClickRay(RcVec3f start, RcVec3f direction, bool shift);
 }
\ No newline at end of file
diff --git a/src/DotRecast.Recast.Demo/Tools/JumpLinkBuilderTool.cs b/src/DotRecast.Recast.Demo/Tools/JumpLinkBuilderTool.cs
index a4143b6..1f0f575 100644
--- a/src/DotRecast.Recast.Demo/Tools/JumpLinkBuilderTool.cs
+++ b/src/DotRecast.Recast.Demo/Tools/JumpLinkBuilderTool.cs
@@ -29,7 +29,7 @@ using static DotRecast.Recast.Demo.Draw.DebugDrawPrimitives;
 
 namespace DotRecast.Recast.Demo.Tools;
 
-public class JumpLinkBuilderTool : Tool
+public class JumpLinkBuilderTool : ITool
 {
     private readonly List<JumpLink> links = new();
     private Sample sample;
@@ -37,17 +37,17 @@ public class JumpLinkBuilderTool : Tool
     private readonly int selEdge = -1;
     private readonly JumpLinkBuilderToolParams option = new JumpLinkBuilderToolParams();
 
-    public override void SetSample(Sample sample)
+    public void SetSample(Sample sample)
     {
         this.sample = sample;
         annotationBuilder = null;
     }
 
-    public override void HandleClick(RcVec3f s, RcVec3f p, bool shift)
+    public void HandleClick(RcVec3f s, RcVec3f p, bool shift)
     {
     }
 
-    public override void HandleRender(NavMeshRenderer renderer)
+    public void HandleRender(NavMeshRenderer renderer)
     {
         int col0 = DuLerpCol(DuRGBA(32, 255, 96, 255), DuRGBA(255, 255, 255, 255), 200);
         int col1 = DuRGBA(32, 255, 96, 255);
@@ -318,11 +318,11 @@ public class JumpLinkBuilderTool : Tool
     {
     }
 
-    public override void HandleUpdate(float dt)
+    public void HandleUpdate(float dt)
     {
     }
 
-    public override void Layout()
+    public void Layout()
     {
         if (0 >= sample.GetRecastResults().Count)
             return;
@@ -442,8 +442,12 @@ public class JumpLinkBuilderTool : Tool
         }
     }
 
-    public override string GetName()
+    public string GetName()
     {
         return "Annotation Builder";
     }
-}
+
+    public void HandleClickRay(RcVec3f start, RcVec3f direction, bool shift)
+    {
+    }
+}
\ No newline at end of file
diff --git a/src/DotRecast.Recast.Demo/Tools/OffMeshConnectionTool.cs b/src/DotRecast.Recast.Demo/Tools/OffMeshConnectionTool.cs
index c33b1b5..266ff10 100644
--- a/src/DotRecast.Recast.Demo/Tools/OffMeshConnectionTool.cs
+++ b/src/DotRecast.Recast.Demo/Tools/OffMeshConnectionTool.cs
@@ -28,19 +28,19 @@ using static DotRecast.Recast.Demo.Draw.DebugDraw;
 
 namespace DotRecast.Recast.Demo.Tools;
 
-public class OffMeshConnectionTool : Tool
+public class OffMeshConnectionTool : ITool
 {
     private Sample sample;
     private bool hitPosSet;
     private RcVec3f hitPos;
     private int bidir;
 
-    public override void SetSample(Sample m_sample)
+    public void SetSample(Sample m_sample)
     {
         sample = m_sample;
     }
 
-    public override void HandleClick(RcVec3f s, RcVec3f p, bool shift)
+    public void HandleClick(RcVec3f s, RcVec3f p, bool shift)
     {
         DemoInputGeomProvider geom = sample.GetInputGeom();
         if (geom == null)
@@ -87,7 +87,7 @@ public class OffMeshConnectionTool : Tool
         }
     }
 
-    public override void HandleRender(NavMeshRenderer renderer)
+    public void HandleRender(NavMeshRenderer renderer)
     {
         if (sample == null)
         {
@@ -109,19 +109,25 @@ public class OffMeshConnectionTool : Tool
         }
     }
 
-    public override void Layout()
+    public void Layout()
     {
         ImGui.RadioButton("One Way", ref bidir, 0);
         ImGui.RadioButton("Bidirectional", ref bidir, 1);
     }
 
-    public override string GetName()
+    public string GetName()
     {
         return "Create Off-Mesh Links";
     }
 
-    public override void HandleUpdate(float dt)
+    public void HandleUpdate(float dt)
     {
         // TODO Auto-generated method stub
     }
+    
+    public void HandleClickRay(RcVec3f start, RcVec3f direction, bool shift)
+    {
+
+    }
+
 }
\ No newline at end of file
diff --git a/src/DotRecast.Recast.Demo/Tools/TestNavmeshTool.cs b/src/DotRecast.Recast.Demo/Tools/TestNavmeshTool.cs
index 5c090cf..862a771 100644
--- a/src/DotRecast.Recast.Demo/Tools/TestNavmeshTool.cs
+++ b/src/DotRecast.Recast.Demo/Tools/TestNavmeshTool.cs
@@ -12,7 +12,7 @@ using static DotRecast.Recast.Demo.Draw.DebugDrawPrimitives;
 
 namespace DotRecast.Recast.Demo.Tools;
 
-public class TestNavmeshTool : Tool
+public class TestNavmeshTool : ITool
 {
     private const int MAX_POLYS = 256;
     private const int MAX_SMOOTH = 2048;
@@ -54,12 +54,12 @@ public class TestNavmeshTool : Tool
             SampleAreaModifications.SAMPLE_POLYFLAGS_DISABLED, new float[] { 1f, 1f, 1f, 1f, 2f, 1.5f });
     }
 
-    public override void SetSample(Sample m_sample)
+    public void SetSample(Sample m_sample)
     {
         this.m_sample = m_sample;
     }
 
-    public override void HandleClick(RcVec3f s, RcVec3f p, bool shift)
+    public void HandleClick(RcVec3f s, RcVec3f p, bool shift)
     {
         if (shift)
         {
@@ -75,7 +75,7 @@ public class TestNavmeshTool : Tool
         Recalc();
     }
 
-    public override void Layout()
+    public void Layout()
     {
         var previousToolMode = m_toolMode;
         int previousStraightPathOptions = m_straightPathOptions;
@@ -153,7 +153,7 @@ public class TestNavmeshTool : Tool
         }
     }
 
-    public override string GetName()
+    public string GetName()
     {
         return "Test Navmesh";
     }
@@ -505,7 +505,7 @@ public class TestNavmeshTool : Tool
         }
     }
 
-    public override void HandleRender(NavMeshRenderer renderer)
+    public void HandleRender(NavMeshRenderer renderer)
     {
         if (m_sample == null)
         {
@@ -973,7 +973,7 @@ public class TestNavmeshTool : Tool
         return center;
     }
 
-    public override void HandleUpdate(float dt)
+    public void HandleUpdate(float dt)
     {
         // TODO Auto-generated method stub
         if (m_toolMode == TestNavmeshToolMode.PATHFIND_SLICED)
@@ -1017,4 +1017,8 @@ public class TestNavmeshTool : Tool
             }
         }
     }
+
+    public void HandleClickRay(RcVec3f start, RcVec3f direction, bool shift)
+    {
+    }
 }
\ No newline at end of file
diff --git a/src/DotRecast.Recast.Demo/UI/ToolsView.cs b/src/DotRecast.Recast.Demo/UI/ToolsView.cs
index 41c9554..1bae479 100644
--- a/src/DotRecast.Recast.Demo/UI/ToolsView.cs
+++ b/src/DotRecast.Recast.Demo/UI/ToolsView.cs
@@ -30,20 +30,19 @@ public class ToolsView : IRcView
 {
     //private readonly NkColor white = NkColor.Create();
     private int _currentToolIdx = 0;
-    private Tool currentTool;
+    private ITool currentTool;
     private bool enabled;
-    private readonly Tool[] tools;
-
-    public ToolsView(params Tool[] tools)
-    {
-        this.tools = tools;
-    }
-
+    private readonly ITool[] tools;
     private bool _mouseInside;
     public bool IsMouseInside() => _mouseInside;
 
     private RecastDemoCanvas _canvas;
 
+    public ToolsView(params ITool[] tools)
+    {
+        this.tools = tools;
+    }
+
     public void Bind(RecastDemoCanvas canvas)
     {
         _canvas = canvas;
@@ -51,7 +50,6 @@ public class ToolsView : IRcView
 
     public void Update(double dt)
     {
-        
     }
 
     public void Draw(double dt)
@@ -89,7 +87,7 @@ public class ToolsView : IRcView
         this.enabled = enabled;
     }
 
-    public Tool GetTool()
+    public ITool GetTool()
     {
         return currentTool;
     }