OnDrawGizmos() can not show boundary

Question

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. alt text

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

Answer 1

Best Answer

Answer by andrew-lukasik · Sep 04, 2021 at 09:04 AM

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 );
             }
         }
     }
 }

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mygoddess007700 · Sep 04, 2021 at 11:32 AM 1

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Thank you very much. Thanks to your code, I wonder if there is a problem with my own project.

I reloaded the project layout and was surprised to find that everything worked out.

For some reason, my previous project layout caused my camera to lose even its edge lines.

In a word, you have successfully solved my problem, I wish you my best wishes.

OnDrawGizmos() can not show boundary

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