シーンにボタンを描画する

GizmoTest.cs

using UnityEngine;
using System.Collections;
#if UNITY_EDITOR
using UnityEditor;
#endif

[ExecuteInEditMode]
public class GizmoTest : MonoBehaviour {

	Color currentColor = Color.red;

	void UpdateColor()
	{
		if( currentColor == Color.red )
		{
			currentColor = Color.blue;
		}else{
			currentColor = Color.red;
		}
		renderer.material.color = currentColor;
	}

#if UNITY_EDITOR

	void  Start()
	{
		UnityEditor.SceneView.onSceneGUIDelegate += OnSceneView;
	}

	void OnDestroy()
	{
		UnityEditor.SceneView.onSceneGUIDelegate -= OnSceneView;
	}

	void OnSceneView(SceneView sceneView)
	{
		var sceneCamera = SceneView.currentDrawingSceneView.camera;;
		var pos = sceneCamera.WorldToScreenPoint(transform.position);
		
		Handles.BeginGUI ();
		
		var buttonRect = new Rect(pos.x , SceneView.currentDrawingSceneView.position.height - pos.y, 100, 30);

		if( GUI.Button( buttonRect, name) )
		{
			UpdateColor();
		}
		
		Handles.EndGUI ();
	}

#endif

}