Gizmos.DrawWireCube

public static void DrawWireCube (Vector3 center, Vector3 size);

説明

center と size からキューブを描画します

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour {
    void OnDrawGizmosSelected() {
        Gizmos.color = Color.yellow;
        Gizmos.DrawWireCube(transform.position, new Vector3(1, 1, 1));
    }
}