Gizmos.DrawWireCube

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

Description

Рисует каркасный куб с центром в точке center и размером size.

using UnityEngine;
using System.Collections;

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