How does this work? HandleUtility.FindNearestVertex

Unity Engine
1

I am trying to use vertex snapping in the scene GUI. I found this method in this documentation but I cannot get it to function properly. I input a GUI point, given by the example given in this GUI Point documentation, but the output Vector3 vertex seems very random to me.

This is the code I used to test this method

    private void OnSceneGUI()
    {
        //Set sphere color
        Handles.color = Color.red;

        //Get the mouse position
        Vector2 mousePos = Event.current.mousePosition;
       
        //Convert it to a gui point
        Vector2 guiPoint = GUIUtility.ScreenToGUIPoint(mousePos);

        //Find the nearest vertex to that gui point
        bool found = HandleUtility.FindNearestVertex(guiPoint, out Vector3 vertex);
       
        //Draw a sphere on that vertex
        Handles.SphereHandleCap(0, vertex, Quaternion.identity, HandleUtility.GetHandleSize(vertex) * .2f, EventType.Repaint);

        //Log results
        Debug.Log(found + ": " + vertex);
    }

This is what it looked like in the Scene View

7256504--874997--8xCz8E21ys.gif

I expected the Sphere to snap to vertices close to the mouse cursor, but it does not do that.

Could someone maybe explain to me how to use this properly?

Thanks!

2

Okay so I already solved it.
This method does exactly work as advertised. However, the Scene View wasn’t repainting as fast as I expected it to do. Because of this, the Sphere did not follow the mouse properly: it lagged behind. If I add Sceneview.RepaintAll() at the end of the code, it all works fine!