Gizmos.DrawWireSphere

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public static void DrawWireSphere(Vector3 center, float radius);

Description

Draws a wireframe sphere with center and radius.

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour
{
    public float explosionRadius = 5.0f;

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