OnSceneGUI() 中的对象仅在被选择时可见

Question

我已经为一些要在场景视图中查看的游戏对象创建了一个编辑器，但它们仅在层次视图中选择时才会出现。下面是我的编辑器脚本。是我缺少的东西吗？

using UnityEditor;
using UnityEngine;

[CustomEditor(typeof(BezierCurve))]
public class BezierCurveInspector : Editor {

    private BezierCurve curve;
    private Transform handleTransform;
    private Quaternion handleRotation;

    private void OnSceneGUI () {
        curve = target as BezierCurve;
        handleTransform = curve.transform;
        handleRotation = Tools.pivotRotation == PivotRotation.Local ?
            handleTransform.rotation : Quaternion.identity;

        Vector3 p0 = ShowPoint(0);
        Vector3 p1 = ShowPoint(1);
        Vector3 p2 = ShowPoint(2);

        Handles.color = Color.white;
        Handles.DrawLine(p0, p1);
        Handles.DrawLine(p1, p2);
    }

    private Vector3 ShowPoint (int index) {
        Vector3 point = handleTransform.TransformPoint(curve.points[index]);
        EditorGUI.BeginChangeCheck();
        point = Handles.DoPositionHandle(point, handleRotation);
        if (EditorGUI.EndChangeCheck()) {
            Undo.RecordObject(curve, "Move Point");
            EditorUtility.SetDirty(curve);
            curve.points[index] = handleTransform.InverseTransformPoint(point);
        }
        return point;
    }
}

我的非编辑器脚本是：

using UnityEngine;

public class BezierCurve : MonoBehaviour {

    public Vector3[] points;

    public void Reset () {
        points = new Vector3[] {
            new Vector3(1f, 0f, 0f),
            new Vector3(2f, 0f, 0f),
            new Vector3(3f, 0f, 0f)
        };
    }
}