Bukkit/Spigot - Projectile locations on hit detection completely wrong - vector

Question

I am making a custom 'gun' plugin for a minecraft server. My problem is that when attempting to detect where a projectile has landed, the locational difference between the projectile and the player being hit is too large to be detected by my headshot method. The only reason I am using a projectile trace for 'isHeadshot' is due to debugging trials.
This is my shoot method
public void shootGun(Player p) {
if (getFirearmAction().isDelayed(p))
return;
double shiftYaw = (p.getLocation().getYaw() + 180) * (Math.PI/180);
Vector shiftVec = new Vector(Math.cos(shiftYaw), 0.0D, Math.sin(shiftYaw)); //TODO: add bullet_spread
for (int i = 0; i < projectileInfo.getAmount(); i++) {
Projectile proj = (Projectile)p.getWorld().spawn(p.getEyeLocation().toVector().add(shiftVec.multiply(0.2D)).toLocation(p.getWorld()), getProjectileInfo().getProjectileClass());
proj.setVelocity(UtilMethods.getBulletVelocity(p).multiply(projectileInfo.getSpeed()));
proj.setShooter(p);
}
projectileInfo.playShootGunSound(p);
getFirearmAction().performAction(p);
}
This is the listener for a 'hit'
#EventHandler
public void onEntDamage(EntityDamageByEntityEvent event) {
if (event.getDamager() instanceof Projectile) {
Projectile p = (Projectile)event.getDamager();
if (p.getShooter() instanceof Player) {
Player player = (Player)p.getShooter();
Gun gun = UtilMethods.getGun(player);
if (gun != null) {
int damage = gun.getProjectileInfo().getDamage();
if (event.getEntity() instanceof Player) {
Player ent = (Player)event.getEntity();
if (UtilMethods.isHeadShot(ent, p))
damage *= 2;
}
event.setDamage(damage);
}
}
}
}
And finally, this is [isHeadshot, isInCuboid, and bulletVelocity] methods. The first two are substitute methods for trying to figure out a failed headshot detection... The getBulletVelocity method sets the correct velocity and direction of the projectile. (In this case I am working with Snowball.class)
public static boolean isHeadShot(Player victim, Projectile projectile) {
Location locA = new Location(victim.getWorld(), victim.getEyeLocation().getX() -0.5, victim.getEyeLocation().getY() - 0.5, victim.getEyeLocation().getZ() - 0.5);
Location locB = new Location(victim.getWorld(), victim.getEyeLocation().getX() +0.5, victim.getEyeLocation().getY() + 0.5, victim.getEyeLocation().getZ() + 0.5);
for (double i = 0; i < 256; i+=0.8D) {
System.out.println(projectile.getLocation() + " | " + victim.getLocation());
projectile.getLocation().add(projectile.getVelocity().normalize().multiply(i));
if (isInCuboid(locA, locB, projectile.getLocation())) {
System.out.println(i);
return true;
}
}
return false;
}
public static boolean isInCuboid(Location min, Location max, Location varying) {
double[] locs = new double[2];
locs[0] = min.getX();
locs[1] = max.getX();
Arrays.sort(locs);
if (varying.getX() > locs[1] || varying.getX() < locs[0])
return false;
locs[0] = min.getY();
locs[1] = max.getY();
Arrays.sort(locs);
if (varying.getY() > locs[1] || varying.getY() < locs[0])
return false;
locs[0] = min.getZ();
locs[1] = max.getZ();
Arrays.sort(locs);
if (varying.getZ() > locs[1] || varying.getZ() < locs[0])
return false;
return true;
}
public static Vector getBulletVelocity(Player shooter) {
double yaw = Math.toRadians((-shooter.getLocation().getYaw() - 90.0f));
double pitch = Math.toRadians(-shooter.getLocation().getPitch());
double x = Math.cos(pitch) * Math.cos(yaw);
double y = Math.sin(pitch);
double z = -Math.sin(yaw) * Math.cos(pitch);
Vector dirVec = new Vector(x, y, z).normalize();
return dirVec;
}
I would like some help since it seems that when the bullet causes damage, the bullet is already through the player's hitbox and can not be detected as a headshot anylonger. Any advice?
This is the locational difference. First location is projectile, second location is victim. However, for there to be a hit, the bullet must pass through the player at one point..
[08:53:22] [Server thread/INFO]: Location{world=CraftWorld{name=San_Andreas},x=2501.8249706725665,y=73.62000000476837,z=1681.0750064188326,pitch=0.0,yaw=0.0} | Location{world=CraftWorld{name=San_Andreas},x=2508.7144181513295,y=72.0,z=1671.9424013003206,pitch=0.3,yaw=-8.100003}

Answer 1

Listen for the ProjectileHitEvent and check if the projectile's y-coord is within a certain distance of the y-coord of the hit player's eye location (the x and z coords are irrelevant for determining a headshot on a player).