OnSceneGUI（）中的对象仅在选中时才可见

Question

我为场景视图中的某些游戏对象创建了一个编辑器，但只有在层次结构视图中选中时才会出现。下面是我的编辑器脚本。是我缺少的东西吗？

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我的非编辑器脚本是：

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;
    }
}