Unity Inspector script to draw a circle in the SceneView

DrawCircle_Unity

using UnityEngine;
using UnityEditor;

// replace "SpawnZone" with the class of your Script on a GameObject
[CustomEditor(typeof(SpawnZone))]
public class SpawnZoneInspector : Editor
{ 

		// replace "SpawnZone" with the class of your Script on a GameObject
		private SpawnZone myZone;
	
		public void OnEnable ()
		{
				// replace "SpawnZone" with the class of your Script on a GameObject
				myZone = target as SpawnZone;
		}


		void OnSceneGUI ()
		{				
				// Choose a Color
				Handles.color = Color.red;
				
				// replace "SpawnZone" with the class of your Script on a GameObject
				// your Class has to have a radius
				Handles.DrawWireDisc (this.myZone.transform.position, Vector3.forward, this.myZone.SpawnRadius);
		}

}