3DTD/Assets/Scripts/Tower/Projectile.cs

using UnityEngine;
using UnityEngine.Assertions;

[RequireComponent(typeof(Collider))]
public class Projectile : MonoBehaviour
{
    [SerializeField, Range(0f, 1f)]
    private float bounciness = 0.5f;

    private Collider projCol;

    [SerializeField, Range(0, 50)]
    private int damage = 10;

    [SerializeField]
    private int wallRebounces = 4;
    private int hitWalls = 0;
    
    public HealthComponent comingFrom;

    private void Awake()
    {
        projCol = GetComponent<Collider>();
        Assert.IsNotNull(projCol);

        PhysicMaterial pMat = new();
        pMat.bounciness = this.bounciness;

        projCol.material = pMat;
    }

    private void OnCollisionEnter(Collision collision)
    {
        HealthComponent hitHealthComp = collision.gameObject.GetComponent<HealthComponent>();
        if (hitHealthComp == comingFrom) return;
        if (hitHealthComp)
        {
            hitHealthComp.TakeDamage(damage);
            Destroy(gameObject);
        }
        else
        {
            if (++hitWalls == wallRebounces)
            {
                Destroy(gameObject);
            }
        }
    }
}