The smelling function using a graph-based system

In this recipe, we take a mixed approach to tag vertices with a given odor particle that collides with it.

Getting ready

The vertices should have a broad collider attached so that they catch the odor particles nearby.

How to do it...

1. Add the following member variable to the odor-particle script to store its parent ID:

public int parent; 

2. Create the new odor-enabled class, deriving from the original vertex:

using UnityEngine; 
using System.Collections; 
using System.Collections.Generic; 
 
public class VertexOdour : Vertex 
{ 
    private Dictionary<int, OdourParticle> odourDic; 
} 

3. Initialize the odor dictionary in the proper function:

public void Start() 
{ 
    odourDic = new Dictionary<int, OdourParticle>(); 
} 

4. Add the odor to the vertex's dictionary:

public void OnCollisionEnter(Collision coll) 
{ 
    OdourOdourParticle op; 
    op = coll.gameObject.GetComponent<OdourParticle>(); 
    if (op == null) 
        return; 
    int...