In this recipe, we take a mixed approach to tag vertices with a given odor particle that collides with it.
The vertices should have a broad collider attached so that they catch the odor particles nearby.
- Add the following member variable to the odor-particle script to store its parent ID:
public int parent;
- 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; } - Initialize the odor dictionary in the proper function:
public void Start() { odourDic = new Dictionary<int, OdourParticle>(); } - 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 id = op.parent; odourDic.Add(id, op); } - Remove the odor from the vertex's dictionary:
public void OnCollisionExit(Collision coll) { OdourParticle op; op = coll.gameObject.GetComponent<OdourParticle>(); if (op == null) return; int id = op.parent; odourDic.Remove(id); } - Implement the function for checking if there is any odor tagged:
public bool HasOdour() { if (odourDic.Values.Count == 0) return false; return true; } - Implement the function for checking if a given type of odor is indexed in the vertex:
public bool OdourExists(int id) { return odourDic.ContainsKey(id); }
The odor particles collide with the vertices, being indexed in their odor dictionary. From that point on, our agents can check whether a given odor is registered in a vertex nearby.
- Chapter 2, Navigation recipe, BFS and graph construction
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