Unity Gizmos visual aids

All gizmo drawing needs to be completed in the OnDrawGizmos or OnDrawGizmosSelected function of the script.

  OnDrawGizmos is called every frame. All gizmos rendered in OnDrawGizmos are visible.

  OnDrawGizmosSelected is only called when the object attached by the script is selected.  

 

1. Gizmos.DrawLine

  Draw a green line from obj1 to obj2

using UnityEngine;
using System.Collections;
public class DrawLineText : MonoBehaviour {

    public GameObject obj1;
    public GameObject obj2;
    
    void OnDrawGizmos()
    {
        Gizmos.color = Color.green;
        Gizmos.DrawLine( obj1.transform.position , obj2.transform.position );
    }
}

2.Gizmos.DrawRay

 Draw a ray of length 10 upward from obj

using UnityEngine;
using System.Collections;
public class DrawRayText : MonoBehaviour {

    public GameObject obj;
    void OnDrawGizmos()
    {
        Gizmos.color = Color.gray;
        Gizmos.DrawRay(obj.transform.position, Vector3.up * 10);  //10 是长度
    }
}

3.Gizmos.DrawCube

 Draw a cube of size (1,1,1) at (0,1,0)

using UnityEngine;
using System.Collections;
public class DrawCubeText : MonoBehaviour {

      void OnDrawGizmos()
    {
        Gizmos.color = Color.red;
        Gizmos.DrawCube(Vector3.up , Vector3.one);
    }
}

4.Gizmos.DrawIcon

 Create an Icon named 002IMgZLzy6Mro7r94Ka2&690.jpg at (0,0,0). This picture must be placed in the Gizmos folder under Assets.

using UnityEngine;
using System.Collections;
public class DrawIconText : MonoBehaviour {

      void OnDrawGizmos()
    {
        Gizmos.DrawIcon(Vector3.zero , "002IMgZLzy6Mro7r94Ka2&690.jpg");
    }
}