Bullet collision help

Questions & Answers
1

My bullets are occasionally flying through objects and I really can’t figure out why. I’m using raycasting as opposed to colliders. Strangely, the speed of the bullet doesn’t seem to stop this from happening, can anyone see anything wrong with my code?

using UnityEngine;
using System.Collections;

public class BulletBase : MonoBehaviour {
	
	public const string BulletHit = "bullethit";
	public const string BulletExplode = "bulletExplode";
	
	public float speed  = 10.0F;
	public float lifeTime = 2.0F;

	protected Transform _tr;
	protected float _spawnTime = 0.0F;
	
	private void Awake() {
		_tr = transform;
	}
	
	public virtual void Start() {
		_tr = transform;
		_spawnTime = Time.time;
	}
	
	private void FixedUpdate() {
		// Check for collisions
		RaycastHit hit;
        if (Physics.Raycast(_tr.position, _tr.forward, out hit, 1.0F)){
			if(hit.transform){
				Messenger<RaycastHit>.Broadcast(BulletBase.BulletHit, hit);
				DestroyBullet();
				return;
			}	
		}
	}

	private void Update() {
		_tr.position += _tr.forward * speed * Time.deltaTime;
	
		if (Time.time > _spawnTime + lifeTime){
			DestroyBullet();
		}
	}

	public void DestroyBullet(){
		ObjectPoolManager.DestroyPooled( gameObject );
		gameObject.SetActiveRecursively(false);	
	}
}
2

You’re raycasting 1 unit ahead, but move them 10 per second. This is error prone. Try something like this:

private void FixedUpdate() {
    // Check for collisions
    RaycastHit hit;
    float moved = speed * Time.deltaTime;     
    if (Physics.Raycast(_tr.position, _tr.forward, out hit, moved)){
        if(hit.transform){
            Messenger<RaycastHit>.Broadcast(BulletBase.BulletHit, hit);
            DestroyBullet();
            return;
        }   
    }
    // Moved Update code to FixedUpdate.
    _tr.position += _tr.forward * moved;
    if (Time.time > _spawnTime + lifeTime){
        DestroyBullet();
    }
}

private void Update() {
    // Nothing goes here
}

Basically, move the update code to fixed update and raycast for as long down the line you intend to move it. FixedUpdate may happen more frequently than your Update so you should also move the transform in FixedUpdate.