Changing the state of the character via a trigger

Question

Hi all, I am working on a project that involves the character changing his state when stood on a trigger. There are four states:

None/Neutral
Air
Fire
Water

Upon standing on a trigger with the specific tag, the player will shift into a different state, and on pressing the left-mouse button, will instantiate a different particle/rigidbody.

I am, however, not very successful, and I need immediate assistance, as I am not as good in programming as the majority in the forums. This script is in C#.

 using UnityEngine;
 using System.Collections;
 
 public class State : MonoBehaviour {
     
     public GameObject particleNone;
     public GameObject particleAir;
     public GameObject particleFire;
     public GameObject particleWater;
     
     private int setStateNone;
     private int setStateAir;
     private int setStateFire;
     private int setStateWater;
     
     void OnTriggerEnter(Collider other) {
         if(other.gameObject.tag == "NonePower") {
             setStateNone();
         }
         
         if(other.gameObject.tag == "AirPower") {
             setStateAir();
         }
         
         if(other.gameObject.tag == "FirePower") {
             setStateFire();
         }
         
         if(other.gameObject.tag == "WaterPower") {
             setStateWater();
         }
     }
     public void Main() {
         state typeofstate = state.None;
         
         
             if(setStateNone) {
                 if(Input.GetMouseButton(0)) {
                     Instantiate(particleNone);
             }
                 if(particleNone == null) {
                     Debug.Log("THERE IS NO PARTICLE FOR *NONE*");
             }
         }
 
             if(setStateAir) {
                 if(Input.GetMouseButton(0)) {
                     Instantiate(particleAir);
             }
                 if(particleAir == null) {
                     Debug.Log("THERE IS NO PARTICLE FOR *AIR*");
             }
         }
 
             if(setStateFire) {
                 if(Input.GetMouseButton(0)) {
                     Instantiate(particleFire);
             }
                 if(particleFire == null) {
                     Debug.Log("THERE IS NO PARTICLE FOR *FIRE*");
             }
         }
 
             if(setStateWater) {
                 if(Input.GetMouseButton(0)) {
                     Instantiate(particleWater);
             }
                 if(particleWater == null) {
                     Debug.Log("THERE IS NO PARTICLE FOR *WATER*");
             }
         }
 }
     
     
     // Use this for initialization
     void Start () {
     
     }
     
     // Update is called once per frame
     void Update () {
     
     }
         
     
     public enum state {
         None,
         Fire,
         Water,
         Air
     }
 }

Answer 1

You should place the code in Update instead of Main - Main isn't defined in Unity scripts, and will do nothing unless you call it explicitly. Use GetMouseButtonDown instead of GetMouseButton, or a new particle will be instantiated every frame while the button is pressed.

   using UnityEngine;
   using System.Collections;
  
   public class State : MonoBehaviour {
  
     public GameObject particleNone;
     public GameObject particleAir;
     public GameObject particleFire;
     public GameObject particleWater;
  
     public enum state {
        None,
        Fire,
        Water,
        Air
     }
 
     private state curState = state.None; // assume None initially
  
     void OnTriggerEnter(Collider other) {
       switch (other.tag){
         case "AirPower":
           curState = state.Air;
           break;
         case "FirePower":
           curState = state.Fire;
           break;
         case "WaterPower":
           curState = state.Water;
           break;
         case "NonePower":
           curState = state.None;
           break;
       }
     }
 
     void Update() {
       // use GetMouseButtonDown to avoid instantiating tons
       // of particles while the mouse button is pressed:
       if(Input.GetMouseButtonDown(0)){
         // calculate position and rotation to instantiate particles
         // this code just do it at the object's position/rotation
         Vector3 pos = transform.position;
         Quaternion rot = transform.rotation;
         switch (curState)
           case state.Air:
             if (particleAir){
               Instantiate(particleAir, pos, rot);
             } else {
               Debug.Log("THERE IS NO PARTICLE FOR *AIR*");
             }
             break;
           case state.Fire:
             if (particleFire){
               Instantiate(particleFire, pos, rot);
             } else {
               Debug.Log("THERE IS NO PARTICLE FOR *FIRE*");
             }
             break;
           case state.Water:
             if (particleWater){
               Instantiate(particleWater, pos, rot);
             } else {
               Debug.Log("THERE IS NO PARTICLE FOR *WATER*");
             }
             break;
           case state.None:
             if (particleNone){
               Instantiate(particleNone, pos, rot);
             } else {
               Debug.Log("THERE IS NO PARTICLE FOR *NONE*");
             }
             break;
         }
       }
     }
   }

Changing the state of the character via a trigger

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