SceneView視窗自定義 是通過Handles類 控制柄來自定義介面，通過HandleUtility 控制柄工具輔助。

Handles控制柄到底是什麼？

直接上圖就明白了：

如上圖箭頭所指的，我們都可以通過Handles控制柄來畫出來。所謂的Handles控制柄就是我們選擇的物體後在場景裡的控制點。

直接上程式碼小測試

首先加一個空指令碼目的是掛在的物體上，然後自定義指令碼視窗

using System.Collections.Generic;
using UnityEngine;

public class HandleTest : MonoBehaviour {
    

}
 

然後將此指令碼掛在到任意物體上

然後定義此指令碼視窗

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEditor;
[CustomEditor(typeof(HandleTest))]
public class HandleTestEditor : Editor
{
    GameObject gameObject;
    Transform _transformPoint;
    Transform transformPoint
    {
        get
        {
            if (!_transformPoint)
            {
                _transformPoint = new GameObject("transformPoint").transform;
            }
            return _transformPoint;
        }
    }
    float cylinderSize = 1;
    Camera camera;
    Camera _cameraTemp;
    Camera cameraTemp
    {
        get
        {
            if (!_cameraTemp)
            {
                _cameraTemp = new GameObject("cameraTemp").AddComponent<Camera>();
            }
            return _cameraTemp;
        }
    }
    private void OnEnable()
    {
        gameObject = ((HandleTest)target).gameObject;
        camera = Camera.main;
        
    }
    private void OnSceneGUI()
    {

        drawCylinder();
        drawShere();
        lookCamera();
        sceneComponent();
    }
    Vector3 point;
    private void lookCamera()
    {
        point = Handles.PositionHandle(point, Quaternion.identity);
        transformPoint.position = point;

        gameObject.transform.LookAt(transformPoint);
    }
    /// <summary>
    /// 畫圓柱
    /// </summary>
    private void drawCylinder()
    {
        Handles.color = Color.red;
        Handles.CylinderHandleCap(0,
        gameObject.transform.position + new Vector3(4, 0, 0),
        gameObject.transform.rotation,
        cylinderSize, EventType.Repaint);
    }
    private void sceneComponent()
    {
        Handles.BeginGUI();
            GUILayout.BeginArea(new Rect(100,100,500,500));
                GUILayout.Button("按鈕"); 
            GUILayout.EndArea();
        Handles.EndGUI();
    }
    /// <summary>
    /// 畫圓
    /// </summary>
    private void drawShere()
    {
        Handles.color = Color.green;
        Handles.SphereHandleCap(0,
        gameObject.transform.position +new Vector3(0, 5, 0),
        gameObject.transform.rotation,
        cylinderSize, EventType.Repaint);
    }
    public override void OnInspectorGUI()
    {
        base.OnInspectorGUI();
        cylinderSize = EditorGUILayout.FloatField(cylinderSize);
    }
}
 

效果如下：

官網對此類已經做了詳細說明

我只附上一些效果做一下筆記

Handles.PositionHandle 位置控制柄

Handles.RotationHandle 旋轉控制柄

Handles.ScaleHandle 縮放控制柄

Handles.RadiusHandle 半徑控制柄

還有其它繪製圖形，檢視官網就可以了