How do I enable a particle system on collision in Unity?

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I'm building a game where the earth is hit by a meteorite. I have programmed the meteorite hitting the earth and both shapes have a sphere collider. I have also designed the explosion particles.

However, I don't know how to activate the explosion once the meteorite collides into the earth.

Here's my code:

Earth rotation script

using System.Collections.Generic;
using UnityEngine;

public class orbit : MonoBehaviour
{
    public Transform world;
    public float rotationSpeed=1f;
    // Start is called before the first frame update
    void Start()
    {
        world = GetComponent<Transform>();
        
        
        Debug.Log("this works on the first frame");
    }

    // Update is called once per frame
    void Update()
    {
        //code for rotating the earth
        world.Rotate(new Vector3(0, rotationSpeed, 0), Space.World);
    }
}

Earth object

particle-system unity3d c#
1 Answers

In order to do that, you have to add Rigid Body on both elements (earth and meteorite) and activate the "Trigger" option, only on one of them. (Earth for example).

Add a new function in this script you added (the snippet of earth rotation).

Add a new variable (the prefab with your particles).

Activate "Play on Awake" on your Particle System and the "Stop action" to Destroy.

public GameObject explosionPrefab;

void OnCollisionEnter(Collision collision)
{
    ContactPoint contact = collision.contacts[0];
    Quaternion rot = Quaternion.FromToRotation(Vector3.up, contact.normal);
    Vector3 pos = contact.point;

    GameObject explosionParticle = Instantiate(explosionPrefab, pos, rot);
}
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