Added basic projectile

Changelog:
1. Linear projectile scene and script
2. project.godot 3D collision layers renamed

base/scenes/projectiles/test_projectile.tscn

@@ -0,0 +1,14 @@
+[gd_scene load_steps=3 format=3 uid="uid://7g41nvss060a"]
+
+[ext_resource type="Script" uid="uid://juvbkxm58688" path="res://base/scripts/projectiles/linear_projectile.gd" id="1_aguxa"]
+
+[sub_resource type="SphereShape3D" id="SphereShape3D_62idg"]
+radius = 0.1
+
+[node name="TestProjectile" type="Area3D"]
+collision_layer = 8
+collision_mask = 4
+script = ExtResource("1_aguxa")
+
+[node name="CollisionShape3D" type="CollisionShape3D" parent="."]
+shape = SubResource("SphereShape3D_62idg")

base/scripts/projectiles/linear_projectile.gd

@@ -0,0 +1,23 @@
+extends Area3D
+
+## Speed of the projectile in meters per second
+@export_range(0,1000,0.01,"or_greater","suffix:m/s") var speed : float
+## Damage of projectile
+@export var damage : float
+
+func _ready() -> void:
+	body_entered.connect(on_body_entered)
+
+## Invoked when area contacts collision object
+func on_body_entered(body : Node):
+	if body.is_in_group("Entities") == false:
+		return
+	
+	# Owner needs to be set to Entity node when spawning projectile
+	if owner is Entity:
+		body.get_node("Entity").deal_damage(damage,owner)
+	else:
+		body.get_node("Entity").deal_damage(damage,null)
+
+func _physics_process(delta: float) -> void:
+	global_position += global_transform.basis.z * delta

base/scripts/projectiles/linear_projectile.gd.uid

@@ -0,0 +1 @@
+uid://juvbkxm58688

project.godot

@@ -50,7 +50,9 @@ shoot={
 [layer_names]
 
 3d_physics/layer_1="Static Environment"
-3d_physics/layer_2="Entities"
+3d_physics/layer_2="Friendly entities"
+3d_physics/layer_3="Enemy entities"
+3d_physics/layer_4="Projectile"
 
 [rendering]