How to instantiate a prefab at mouse location in the editor in unity?

Question

I want to instantiate a prefab at the mouse position in the editor. All the answers I found till now are for instatiate a prefab at runtime but i want to instantiate in the editor. Currently I am trying to use input.GetMouseButtonDown but that doesn't seem to work ? Also is it fine to use raycasting in the editor itself?

EDIT: Alright I found that we need to use eventtype.MouseDown but now the script is not executing? there are no errors in the console window

using UnityEngine;
using UnityEditor;
[ExecuteInEditMode]
public class mapMaker : Editor
{
    public GameObject rock;
    private void OnSceneGUI()
    {
        if (Event.current.type == EventType.MouseDown)
        {
            Ray ray = Camera.current.ScreenPointToRay(Event.current.mousePosition);
            RaycastHit hit;
            if (Physics.Raycast(ray, out hit, 1000.0f))
            {
                Debug.Log(Event.current.mousePosition);
                Vector3 newTilePosition = hit.point;
                Instantiate(rock, newTilePosition, Quaternion.identity);
            }
        }
    }
}

```

Answer 1

You may have to listen to scene events.

Here is an example which creates an Editor Window which you can open from Window menu (in Unity menu bar). I think you can use pretty much the same code if you want to have similar functionality from a Custom Editor.

How to use: Open this window from Window menu (Raycast in editor test), then click 'Enable Raycasting' in Editor Window and click on some Collider in Scene View to spawn Default Cubes.

using UnityEditor;
using UnityEngine;

public class Raycast : EditorWindow
{
    static bool active;

    // Open this from Window menu
    [MenuItem("Window/Raycast in editor test")]
    static void Init()
    {
        var window = (Raycast)EditorWindow.GetWindow(typeof(Raycast));
        window.Show();
    }

    // Listen to scene event
    void OnEnable() => SceneView.duringSceneGui += OnSceneGUI;
    void OnDisable() => SceneView.duringSceneGui -= OnSceneGUI;

    // Receives scene events
    // Use event mouse click for raycasting
    void OnSceneGUI(SceneView view)
    {
        if (!active)
        {
            return;
        }

        if (Event.current.type == EventType.MouseDown)
        {
            Ray ray = HandleUtility.GUIPointToWorldRay(Event.current.mousePosition);
            RaycastHit hit;

            // Spawn cube on hit location
            if (Physics.Raycast(ray, out hit))
            {
                Debug.Log("Hit: " + hit.collider.gameObject.name);

                var obj = GameObject.CreatePrimitive(PrimitiveType.Cube);
                obj.transform.position = hit.point;
            }
        }

        Event.current.Use();
    }

    // Creates a editor window with button 
    // to toggle raycasting on/off
    void OnGUI()
    {
        if (GUILayout.Button("Enable Raycasting"))
        {
            active = !active;
        }

        GUILayout.Label("Active:" + active);
    }

}