Gizmos.DrawWireSphere

Description

Draws a wireframe sphere with center and radius.

    var explosionRadius = 5.0;
    function OnDrawGizmosSelected () {
        // Display the explosion radius when selected
        Gizmos.color = Color.white;
        Gizmos.DrawWireSphere (transform.position, explosionRadius);
    }

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour {
    public float explosionRadius = 5.0F;
    void OnDrawGizmosSelected() {
        Gizmos.color = Color.white;
        Gizmos.DrawWireSphere(transform.position, explosionRadius);
    }
}