Add flame effect to campfire and make Flame script

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Assets/Scripts/Flame.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+[ExecuteAlways]
+public class Flame : MonoBehaviour {
+
+    [Range(0, 1)]
+    public float Aliveness = 1;
+    public ParticleSystem System;
+    public float AddFuelEffect;
+
+    private float SecretBoost = 0f;
+
+    // Start is called before the first frame update
+    void Start() {
+
+    }
+
+    // Update is called once per frame
+    void Update() {
+        if (AddFuelEffect > 0f) {
+            SecretBoost += 0.2f / (SecretBoost + 0.2f) * 2f * AddFuelEffect;
+            AddFuelEffect = 0f;
+        }
+        if (SecretBoost > 0) {
+            SecretBoost -= Time.deltaTime * 3;
+        }
+        float TotalAliveness = Aliveness + Mathf.Max(SecretBoost, 0);
+
+        System.startLifetime = 1.2f + 1.8f * Aliveness;
+        var em = System.emission;
+        em.rateOverTime = 20 + 80 * TotalAliveness;
+        var vol = System.velocityOverLifetime;
+        vol.radial = 0.7f * TotalAliveness;
+    }
+}

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