134 lines
4.2 KiB
C#
134 lines
4.2 KiB
C#
using System.Collections;
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using System.Collections.Generic;
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using UnityEngine;
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using UnityEngine.Events;
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namespace BNG {
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/// <summary>
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/// An object than do damage and play hit FX
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/// </summary>
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public class Projectile : MonoBehaviour {
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public GameObject HitFXPrefab;
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private bool _checkRaycast;
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public float Damage = 25;
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/// <summary>
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/// Add force to rigidbody on impact
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/// </summary>
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public float AddRigidForce = 5;
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public LayerMask ValidLayers;
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public bool StickToObject = false;
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/// <summary>
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/// Minimum Z velocity required to register as an impact
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/// </summary>
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public float MinForceHit = 0.02f;
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[Tooltip("Unity Event called when the projectile damages something")]
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public UnityEvent onDealtDamageEvent;
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private void OnCollisionEnter(Collision collision) {
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OnCollisionEvent(collision);
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}
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public virtual void OnCollisionEvent(Collision collision) {
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// Ignore Triggers
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if (collision.collider.isTrigger) {
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return;
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}
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Rigidbody rb = GetComponent<Rigidbody>();
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if (rb && MinForceHit != 0) {
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float zVel = System.Math.Abs(transform.InverseTransformDirection(rb.velocity).z);
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// Minimum Force not achieved
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if (zVel < MinForceHit) {
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return;
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}
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}
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Vector3 hitPosition = collision.contacts[0].point;
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Vector3 normal = collision.contacts[0].normal;
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Quaternion hitNormal = Quaternion.FromToRotation(Vector3.forward, normal);
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// FX - Particles, Decals, etc.
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DoHitFX(hitPosition, hitNormal, collision.collider);
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// Damage if possible
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Damageable d = collision.collider.GetComponent<Damageable>();
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if (d) {
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d.DealDamage(Damage, hitPosition, normal, true, gameObject, collision.collider.gameObject);
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if (onDealtDamageEvent != null) {
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onDealtDamageEvent.Invoke();
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}
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}
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if (StickToObject) {
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// tryStickToObject
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}
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else {
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// Done with this projectile
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Destroy(this.gameObject);
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}
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}
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public virtual void DoHitFX(Vector3 pos, Quaternion rot, Collider col) {
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// Create FX at impact point / rotation
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if(HitFXPrefab) {
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GameObject impact = Instantiate(HitFXPrefab, pos, rot) as GameObject;
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BulletHole hole = impact.GetComponent<BulletHole>();
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if (hole) {
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hole.TryAttachTo(col);
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}
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}
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// push object if rigidbody
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Rigidbody hitRigid = col.attachedRigidbody;
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if (hitRigid != null) {
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hitRigid.AddForceAtPosition(transform.forward * AddRigidForce, pos, ForceMode.VelocityChange);
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}
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}
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/// <summary>
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/// A projectile can be converted into a raycast if time reverts to full speed (or more)
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/// </summary>
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public virtual void MarkAsRaycastBullet() {
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_checkRaycast = true;
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StartCoroutine(CheckForRaycast());
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}
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public virtual void DoRayCastProjectile() {
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// Raycast to hit
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RaycastHit hit;
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if (Physics.Raycast(transform.position, transform.forward, out hit, 25f, ValidLayers, QueryTriggerInteraction.Ignore)) {
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Quaternion decalRotation = Quaternion.FromToRotation(Vector3.forward, hit.normal);
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DoHitFX(hit.point, decalRotation, hit.collider);
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}
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_checkRaycast = false;
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// Done with this projectile
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Destroy(this.gameObject);
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}
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IEnumerator CheckForRaycast() {
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while(this.gameObject.activeSelf && _checkRaycast) {
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// Switch to raycast
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if (Time.timeScale >= 1) {
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DoRayCastProjectile();
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}
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yield return new WaitForEndOfFrame();
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}
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}
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}
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}
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