implement base projectile system

Assets/Prefabs/GameManager.prefab

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Assets/Prefabs/Projectile.prefab.meta

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Assets/Scripts/Behaviours/Projectile.cs

@@ -0,0 +1,87 @@
+using SanAndreasUnity.Behaviours.Vehicles;
+using SanAndreasUnity.Net;
+using SanAndreasUnity.Utilities;
+using UnityEngine;
+using Object = UnityEngine.Object;
+
+public class Projectile : MonoBehaviour
+{
+    public GameObject explosionPrefab;
+    public float explosionDamageAmount = 1000;
+    public float explosionDamageRadius = 5;
+    public LayerMask collisionLayerMask;
+    public float speed = 10;
+    public float lifeTime = 30;
+
+    private bool m_alreadyExploded = false;
+    private Rigidbody m_rigidBody;
+    private AudioSource m_audioSource;
+
+
+    public static Projectile Create(
+        GameObject prefab, Vector3 position, Quaternion rotation, AudioClip audioClip)
+    {
+        var go = Instantiate(prefab, position, rotation);
+
+        var projectile = go.GetComponentOrThrow<Projectile>();
+
+        if (audioClip != null)
+        {
+            projectile.m_audioSource.clip = audioClip;
+            projectile.m_audioSource.Play();
+        }
+
+
+
+        return projectile;
+    }
+
+    void Awake()
+    {
+        m_rigidBody = this.GetComponentOrThrow<Rigidbody>();
+        m_audioSource = this.GetComponentOrThrow<AudioSource>();
+    }
+
+    private void Start()
+    {
+        Destroy(this.gameObject, this.lifeTime);
+        m_rigidBody.velocity = this.transform.forward * this.speed;
+    }
+
+    private void OnCollisionEnter(Collision other)
+    {
+        if (m_alreadyExploded)
+            return;
+
+        if (((1 << other.gameObject.layer) & this.collisionLayerMask.value) == 0)
+            return;
+
+        m_alreadyExploded = true;
+
+        Object.Destroy(this.gameObject);
+
+        Vector3 contactPoint = other.contacts[0].point;
+
+        // inflict damage to nearby objects
+        Damageable.InflictDamageToObjectsInArea(
+            contactPoint,
+            this.explosionDamageRadius,
+            this.explosionDamageAmount,
+            VehicleManager.Instance.explosionDamageOverDistanceCurve,
+            DamageType.Explosion);
+
+        // create explosion - this includes effects, physics force, sound
+
+        GameObject explosionGo = Object.Instantiate(
+            this.explosionPrefab,
+            contactPoint,
+            this.transform.rotation);
+
+        if (NetStatus.IsServer)
+            NetManager.Spawn(explosionGo);
+
+        // assign explosion sound
+        F.RunExceptionSafe(() => Vehicle.AssignExplosionSound(explosionGo));
+
+    }
+}

Assets/Scripts/Behaviours/Projectile.cs.meta

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Assets/Scripts/Behaviours/Weapon.cs

@@ -159,6 +159,12 @@ namespace SanAndreasUnity.Behaviours
 
         WeaponAttackParams m_lastRaycastWeaponAttackParams = WeaponAttackParams.Default;
 
+        static readonly HashSet<int> s_weaponsUsingProjectile = new HashSet<int>()
+        {
+	        WeaponId.RocketLauncher,
+	        WeaponId.RocketLauncherHS,
+        };
+
 
 
 		static Weapon ()
@@ -361,6 +367,10 @@ namespace SanAndreasUnity.Behaviours
 
 			this.CrouchSpineRotationOffset = WeaponsSettings.crouchSpineRotationOffset;
 
+			this.FiresProjectile = s_weaponsUsingProjectile.Contains(this.Data.modelId1);
+			if (this.FiresProjectile)
+				this.ProjectilePrefab = WeaponsSettings.projectilePrefab;
+
 		}
 
 		protected virtual void Start ()
@@ -507,6 +517,13 @@ namespace SanAndreasUnity.Behaviours
 
 		public Vector3 CrouchSpineRotationOffset { get; set; }
 
+		/// <summary>
+		/// True if weapon doesn't inflict damage instantly, but instead fires a projectile.
+		/// </summary>
+		public bool FiresProjectile { get; set; } = false;
+
+		public GameObject ProjectilePrefab { get; set; }
+
 
 		// TODO: this function should be removed, and new one should be created: OnAnimsUpdated
 		public virtual void UpdateAnimWhileHolding ()
@@ -615,6 +632,12 @@ namespace SanAndreasUnity.Behaviours
 
             this.LastTimeWhenFired = Time.time;
 
+            if (this.FiresProjectile)
+            {
+	            Projectile.Create(this.ProjectilePrefab, firePos, Quaternion.LookRotation(fireDir), null);
+	            return;
+            }
+
 			// raycast against all (non-breakable ?) objects
 
 			RaycastHit hit;

Assets/Scripts/Behaviours/Weapons/WeaponsManager.cs

@@ -50,6 +50,8 @@ namespace SanAndreasUnity.Behaviours.Weapons
 
 		public bool drawLineFromGun = false;
 
+		public GameObject projectilePrefab;
+
 
 		public static WeaponsManager Instance { get; private set; }