Gizmos.DrawSphere

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

Description

Рисует сферу с центром в точке center и радиусом radius.

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour
{
    void OnDrawGizmosSelected()
    {
        // Draw a yellow sphere at the transform's position
        Gizmos.color = Color.yellow;
        Gizmos.DrawSphere(transform.position, 1);
    }
}