The seeing function using a graph-based system

We will start looking at those recipes using graph-based logic in order to simulate sense. Again, we start by developing a sense of vision.

Getting ready

It is important to have grasped Chapter 2, Navigation, in order to understand the inner workings of the graph-based recipes.

How to do it...

We will just implement a new file:

1. Create the class for handling vision:

using UnityEngine; 
using System.Collections; 
using System.Collections.Generic; 
 
public class VisorGraph : MonoBehaviour 
{ 
    public int visionReach; 
    public GameObject visorObj; 
    public Graph visionGraph; 
} 

2. Validate the visor object in case the component is not attached:

void Start() 
{ 
    if (visorObj == null) 
        visorObj = gameObject; 
} 

3. Define and start building the function for detecting the visibility of a given set of nodes:

public bool IsVisible(int[] visibilityNodes) 
{ 
    int vision = visionReach; 
    int src = visionGraph.GetNearestVertex(visorObj); 
...