trying to get the default TransformEditor to work with my custom editor

Editor/HandlesMaterials.cs

@@ -8,11 +8,13 @@ public static class HandlesMaterials
 	{
 		public static Material	vertexColor;
 		public static Material	textured;
+		public static Material	overlayColor;
 
 		static HandlesMaterials()
 		{
-			vertexColor = Resources.Load< Material >("vertexColorMaterial");
-			textured = Resources.Load< Material >("texturedMaterial");
+			vertexColor = Resources.Load< Material >("VertexColorMaterial");
+			textured = Resources.Load< Material >("TexturedMaterial");
+			overlayColor = Resources.Load< Material >("OverlayColorHandle");
 		}
 	}
 }

ExamplesScenes/BasicHandles.unity

@@ -225,7 +225,7 @@ MeshRenderer:
   m_PrefabParentObject: {fileID: 0}
   m_PrefabInternal: {fileID: 0}
   m_GameObject: {fileID: 68830444}
-  m_Enabled: 0
+  m_Enabled: 1
   m_CastShadows: 1
   m_ReceiveShadows: 1
   m_DynamicOccludee: 1
@@ -279,7 +279,7 @@ Transform:
   m_PrefabInternal: {fileID: 0}
   m_GameObject: {fileID: 68830444}
   m_LocalRotation: {x: 0, y: 0, z: 0, w: 1}
-  m_LocalPosition: {x: 0, y: 0, z: 0}
+  m_LocalPosition: {x: 4.458, y: -0.013, z: -2.4448}
   m_LocalScale: {x: 1, y: 1, z: 1}
   m_Children: []
   m_Father: {fileID: 0}

ExamplesScenes/Editor/SnapHandleEditor.cs

@@ -2,17 +2,96 @@
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEditor;
+using BetterHandles;
 
-[CustomEditor(typeof(Transform))]
+[CustomEditor(typeof(Transform), true)]
 public class SnapHandleEditor : Editor
 {
+	const float	snapHandleDistance = 3.5f;
+	const float	snapHandleSize = .15f;
+	const float defaultSnapUnit = .1f;
+	const float shiftSnapUnit = .5f;
+	const float commandSnapUnit = .05f;
+
+	Mesh		snapToolMesh;
+	Transform	transform;
+	Material	handleMat;
+
+	Quaternion	currentRotation;
+	Color		currentColor;
+
+	Editor		defaultTransformEditor;
+
 	void OnEnable()
 	{
-
+		snapToolMesh = Resources.Load< Mesh >("snapToolHandle");
+		Debug.Log("target: " + target + ", type: " + target.GetType());
+		transform = target as Transform;
 	}
 
 	void OnSceneGUI()
 	{
-		Handles.Label(Vector3.zero, "snap handle editro here", EditorStyles.whiteLabel);
+		// if (Tools.current != Tool.Move)
+		// 	return ;
+
+		//x axis
+		DrawAxisHandle(Quaternion.Euler(0, 0, 90), transform.right, Handles.xAxisColor, 0);
+		//y axis
+		DrawAxisHandle(Quaternion.Euler(0, 0, 0), transform.up, Handles.yAxisColor, 1);
+		//z axis
+		DrawAxisHandle(Quaternion.Euler(90, 0, 0), transform.forward, Handles.zAxisColor, 2);
+	}
+
+	void DrawAxisHandle(Quaternion rotation, Vector3 direction, Color color, int index)
+	{
+		var e = Event.current;
+
+		float snapUnit = (e.shift) ? shiftSnapUnit : (e.command) ? commandSnapUnit : defaultSnapUnit;
+		float size = HandleUtility.GetHandleSize(transform.position) * snapHandleSize;
+		float dist = size * snapHandleDistance;
+
+		currentRotation = rotation;
+		currentColor = color;
+
+		Vector3 addPos = direction * dist;
+		Vector3 newPosition = Handles.Slider(transform.position + addPos, direction, size, SnapHandleCap, 0) - addPos;
+
+		if (newPosition != transform.position)
+		{
+			//handmade snapping selected axis
+			newPosition[index] = Mathf.Round(newPosition[index] / snapUnit) * snapUnit;
+
+			transform.position = newPosition;
+		}
+	}
+
+	void SnapHandleCap(int controlId, Vector3 position, Quaternion rotation, float size, EventType eventType)
+	{
+		if (eventType == EventType.Repaint)
+		{
+			//we set the material color or preselected color if mouse is near from our handle
+			Color color = (HandleUtility.nearestControl == controlId || GUIUtility.hotControl == controlId) ? Handles.preselectionColor : currentColor;
+			HandlesMaterials.overlayColor.SetColor("_Color", color);
+
+			//we draw the cylinder with overlay material
+			HandlesMaterials.overlayColor.SetPass(0);
+			Matrix4x4 trs = Matrix4x4.TRS(position, transform.rotation * currentRotation, Vector3.one * size);
+			Graphics.DrawMeshNow(snapToolMesh, trs);
+		}
+		else if (eventType == EventType.Layout)
+		{
+			float distance = HandleUtility.DistanceToCircle(position, size);
+			HandleUtility.AddControl(controlId, distance);
+		}
+	}
+
+	public override void OnInspectorGUI()
+	{
+		if (defaultTransformEditor == null)
+			defaultTransformEditor = Editor.CreateEditor(transform);
+
+		Debug.Log("deafultTransformEditor: " + defaultTransformEditor);
+		if (defaultTransformEditor.GetType() != typeof(SnapHandleEditor))
+				defaultTransformEditor.OnInspectorGUI();
 	}
 }

ExamplesScenes/curves/curve4.asset

@@ -82,5 +82,5 @@ MonoBehaviour:
     m_Mode: 0
     m_NumColorKeys: 2
     m_NumAlphaKeys: 2
-  curveSize: {x: 5.27, y: 5.74}
+  curveSize: {x: 5.53, y: 5.74}
   sampleCount: 500

Resources/OverlayColorHandle.mat

@@ -0,0 +1,76 @@
+%YAML 1.1
+%TAG !u! tag:unity3d.com,2011:
+--- !u!21 &2100000
+Material:
+  serializedVersion: 6
+  m_ObjectHideFlags: 0
+  m_PrefabParentObject: {fileID: 0}
+  m_PrefabInternal: {fileID: 0}
+  m_Name: OverlayColorHandle
+  m_Shader: {fileID: 4800000, guid: 01e9f68f8b863406893a2dc8ee9a4340, type: 3}
+  m_ShaderKeywords: 
+  m_LightmapFlags: 4
+  m_EnableInstancingVariants: 0
+  m_DoubleSidedGI: 0
+  m_CustomRenderQueue: -1
+  stringTagMap: {}
+  disabledShaderPasses: []
+  m_SavedProperties:
+    serializedVersion: 3
+    m_TexEnvs:
+    - _BumpMap:
+        m_Texture: {fileID: 0}
+        m_Scale: {x: 1, y: 1}
+        m_Offset: {x: 0, y: 0}
+    - _DetailAlbedoMap:
+        m_Texture: {fileID: 0}
+        m_Scale: {x: 1, y: 1}
+        m_Offset: {x: 0, y: 0}
+    - _DetailMask:
+        m_Texture: {fileID: 0}
+        m_Scale: {x: 1, y: 1}
+        m_Offset: {x: 0, y: 0}
+    - _DetailNormalMap:
+        m_Texture: {fileID: 0}
+        m_Scale: {x: 1, y: 1}
+        m_Offset: {x: 0, y: 0}
+    - _EmissionMap:
+        m_Texture: {fileID: 0}
+        m_Scale: {x: 1, y: 1}
+        m_Offset: {x: 0, y: 0}
+    - _MainTex:
+        m_Texture: {fileID: 0}
+        m_Scale: {x: 1, y: 1}
+        m_Offset: {x: 0, y: 0}
+    - _MetallicGlossMap:
+        m_Texture: {fileID: 0}
+        m_Scale: {x: 1, y: 1}
+        m_Offset: {x: 0, y: 0}
+    - _OcclusionMap:
+        m_Texture: {fileID: 0}
+        m_Scale: {x: 1, y: 1}
+        m_Offset: {x: 0, y: 0}
+    - _ParallaxMap:
+        m_Texture: {fileID: 0}
+        m_Scale: {x: 1, y: 1}
+        m_Offset: {x: 0, y: 0}
+    m_Floats:
+    - _BumpScale: 1
+    - _Cutoff: 0.5
+    - _DetailNormalMapScale: 1
+    - _DstBlend: 0
+    - _GlossMapScale: 1
+    - _Glossiness: 0.5
+    - _GlossyReflections: 1
+    - _Metallic: 0
+    - _Mode: 0
+    - _OcclusionStrength: 1
+    - _Parallax: 0.02
+    - _SmoothnessTextureChannel: 0
+    - _SpecularHighlights: 1
+    - _SrcBlend: 1
+    - _UVSec: 0
+    - _ZWrite: 1
+    m_Colors:
+    - _Color: {r: 0.227451, g: 0.4784314, b: 0.972549, a: 0.93}
+    - _EmissionColor: {r: 0, g: 0, b: 0, a: 1}

Resources/snapToolHandle.mtl

@@ -0,0 +1,12 @@
+# Blender MTL File: 'None'
+# Material Count: 1
+
+newmtl None
+Ns 96.078431
+Ka 1.000000 1.000000 1.000000
+Kd 0.640000 0.640000 0.640000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.000000
+d 1.000000
+illum 2