Gizmos.DrawWireSphere

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

説明

center と radius からワイヤーフレームの球体を描画します

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);
    }
}