Better bullet traces and raycast for hitscan

scenes/weapon/guns/ak/with_hands.gd

@@ -4,23 +4,30 @@ extends Node3D
 # Called when the node enters the scene tree for the first time.
 func _ready() -> void:
 	pass # Replace with function body.
-@onready var barrel: Node3D = $Barrel
+@onready var bullet_trace_distance: Node3D = $BulletTraceDistance
+@onready var bullet_trail_end: Node3D = $BulletTrailEnd
 
 func shoot() -> Error:
+	var bullet_start_node: Node3D = bullet_trace_distance.find_child("Start")
+	var bullet_end_node: Node3D = bullet_trace_distance.find_child("End")
+	if bullet_start_node and bullet_end_node:
+		var path := "res://scenes/weapon/misc/bullet_trail_generic.tscn"
+		if not ResourceLoader.exists(path):
+			return ERR_DOES_NOT_EXIST
+		var scene: PackedScene = ResourceLoader.load(path)
+		if not scene.can_instantiate():
+			return ERR_CANT_OPEN
+		
+		var node: MeshInstance3D = scene.instantiate()
+		node.init(bullet_start_node.global_position, bullet_end_node.global_position)
+		var root := get_tree().get_root()
+		root.add_child(node)
+		return OK
+	else:
+		push_warning("Couldn't generate a bullet trace, no distance node found")
+		return ERR_BUG
 	# -- TODO: It should not be hardcoded
-	var path := "res://scenes/weapon/guns/ak/bullet.tscn"
-	if not ResourceLoader.exists(path):
-		return ERR_DOES_NOT_EXIST
-	var scene: PackedScene = ResourceLoader.load(path)
-	if not scene.can_instantiate():
-		return ERR_CANT_OPEN
-	var node: Node3D = scene.instantiate()
-	var root := get_tree().get_root()
-	node.position = barrel.global_position
-	node.transform.basis = barrel.global_transform.basis
-	root.add_child(node)
-	return OK
-
+	
 # Called every frame. 'delta' is the elapsed time since the previous frame.
 func _process(delta: float) -> void:
 	pass