UI Handles disappear when using OnSceneGui

Unity Engine
, , ,
1

Hey,

I followed this youtube tutorial on Bézier curves. But when I add the OnSceneGui method, for some reason the FreeMoveHandles won’t show up, and also all the handles, for moving objects in the scene disappear as well. I have gizmos enabled, all the methods are being called correctly, my camera is behind the object so I don’t know what might be the problem.

These are the scripts for the tutorial. I checked and they are the same as mine until a point, where I had to stop because I couldn’t follow along anymore, thanks to the problem.

Regardless, this is my code:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

[System.Serializable]
public class Path
{
    [SerializeField, HideInInspector]
    List<Vector2> points;
   
    public Path(Vector2 centre)
    {
        points = new List<Vector2>
        {
            centre + Vector2.left,
            centre + (Vector2.left + Vector2.up) * 0.5f,
            centre + (Vector2.right + Vector2.down) * 0.5f,
            centre + Vector2.right

        };

    }

    public void AddSegment(Vector2 anchorPos)
    {
        points.Add(points[points.Count - 1] * 2 - points[points.Count - 2]);
        points.Add((points[points.Count - 1] + anchorPos) / 2);
        points.Add(anchorPos);
    }

    public Vector2[] GetPointsInSegment(int i)
    {
        return new Vector2[]
        {
            points[i * 3],
            points[i * 3 + 1],
            points[i * 3 + 2],
            points[i * 3 + 3],
        };
    }

    public Vector2 this[int i]
    {
        get
        {
            return points[i];
        }
    }

    public int NumSegments
    {
        get
        {
            return (points.Count - 1) / 3;
        }
    }

    public int NumPoints
    {
        get
        {
            return points.Count;
        }
    }

    public void MovePoint(int i, Vector2 pos)
    {
        points[i] = pos;
    }
}

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class PathCreator : MonoBehaviour
{
    [HideInInspector]
    public Path path;

    public void CreatePath()
    {
        path = new Path(transform.position);
    }
}

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEditor;

[CustomEditor(typeof(PathCreator))]
public class PathEditor : Editor
{
    PathCreator creator;
    Path path;


    private void OnSceneGUI()
    {
        Draw();
    }
    void Draw()
    {

        Handles.color = Color.red;
        for (int i = 0; i < path.NumPoints; i++)
        {

            Vector2 v2 = creator.transform.position;
            Vector2 newPos = Handles.FreeMoveHandle(path[i] + v2, Quaternion.identity, 0.5f, Vector2.zero, Handles.SphereHandleCap);
            if (path[i] != newPos)
            {
                Undo.RecordObject(creator, "Move point");
                path.MovePoint(i, newPos);
            }
        }
    }

    private void OnEnable()
    {

        creator = (PathCreator)target;
        if (creator.path == null)
        {
            creator.CreatePath();
        }
        path = creator.path;
    }
}
2

It seems that you should wrap the code with Handles.BeginGUI() and Handles.EndGUI().

public void OnSceneGUI()
{
    Handles.BeginGUI();
    // YOUR CUSTOM GUI CODE
    Handles.EndGUI();
}