The seeing function using a collider-based system

This is probably the easiest way to simulate vision. We take a collider, be it a mesh or a Unity primitive, and use it as the tool for determining whether or not an object is inside the agent's vision range.

Getting ready

It's important to have a collider component attached to the same game object using the script on this recipe, as well as the other collider-based algorithms in this chapter. In this case, it's recommended that the collider is a pyramid-based one in order to simulate a vision cone. The fewer the polygons, the faster it will be in the game.

How to do it…

We will create a component that is able to see enemies nearby:

1. Create the Visor component declaring its member variables. It is important to add the following corresponding tags into Unity's configuration:

   using UnityEngine;
   using System.Collections;
   
   public class Visor : MonoBehaviour
   {
       public string tagWall = "Wall";
       public string...