OnDrawGizmos() can not show boundary

Questions & Answers
1

I made a small plane and was going to add a boundary to the plane’s range, and I chose OnDrawGizmos(), but I had a problem.

The problem is that I can’t see the rectangle boundary I drew in my project panel.

This is my code. I put it on the plane. In fact, if I replace this code with some other simple boundary code, I can’t see the boundary too.

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

public class BoundsCheck : MonoBehaviour
{
    [Header("Set Dynamically")]
    public float camWidth;
    public float camHeight;

    private void Awake()
    {
        camHeight = Camera.main.orthographicSize;
        camWidth = camHeight * Camera.main.aspect;
    }

    private void OnDrawGizmos()
    {
        if(!Application.isPlaying)
        {
            return;
        }
        Vector3 boundSize = new Vector3(camWidth * 2, camHeight * 2, 0.1f);
        Gizmos.DrawWireCube(Vector3.zero, boundSize);
    }
}

And the Gizmos menu does have this script.

185733-question.png
185733-question.png945×538 110 KB

Hope someone can give advice, if there is anything I need to add, please feel free to ask, thanks a million.

2

I think I really want the origin to be the center. And even if I changed the origin to the current position of the plane, I still didn’t see the boundary. I was very confused.

3

If the thing you want to just draw camera orthographic bounds, this is how you do that:

DrawCameraOgraphicBounds.cs

using UnityEngine;
public class DrawCameraOgraphicBounds : MonoBehaviour
{
    [SerializeField] Camera _camera = null;
    void OnDrawGizmos ()
    {
        if( _camera!=null )
        {
            if( !_camera.orthographic )
            {
                Debug.LogWarning("camera is not orthographic",gameObject);
                return;
            }

            Gizmos.matrix = _camera.cameraToWorldMatrix;// special camera matrix
            {
                float h = _camera.orthographicSize;
                float w = h * _camera.aspect;
                float near = _camera.nearClipPlane;
                float far = _camera.farClipPlane;
                Vector3 size = new Vector3( w*2 , h*2 , far-near );
                Vector3 localOffset = new Vector3( 0 , 0 , -size.z*0.5f - near );
                
                Gizmos.color = new Color(0,1,0,0.05f); Gizmos.DrawCube( localOffset , size );
                Gizmos.color = new Color(1,1,0,1); Gizmos.DrawWireCube( localOffset , size );
            }
        }
    }
}