add test unit

scenes/units/test_unit.tscn

@@ -0,0 +1,25 @@
+[gd_scene load_steps=5 format=3 uid="uid://cfixshlmwhpmi"]
+
+[ext_resource type="Script" path="res://scripts/units/test_unit.gd" id="1_e76lg"]
+[ext_resource type="PackedScene" uid="uid://bi231xk2sp410" path="res://assets/models/ant.glb" id="1_ff64u"]
+[ext_resource type="Texture2D" uid="uid://dehqm00kiljut" path="res://assets/textures/selection_unit_decal.png" id="2_5725f"]
+
+[sub_resource type="SphereShape3D" id="SphereShape3D_kq47f"]
+radius = 0.25
+
+[node name="TestUnit" type="Node3D"]
+script = ExtResource("1_e76lg")
+
+[node name="ant2" parent="." instance=ExtResource("1_ff64u")]
+
+[node name="CharacterBody3D" type="StaticBody3D" parent="."]
+
+[node name="CollisionShape3D" type="CollisionShape3D" parent="CharacterBody3D"]
+transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0.25, 0)
+shape = SubResource("SphereShape3D_kq47f")
+
+[node name="SelectionSprite" type="Sprite3D" parent="."]
+transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, -0.0021804, 0.00953716, -0.00236732)
+pixel_size = 0.0055
+axis = 1
+texture = ExtResource("2_5725f")

scripts/units/test_unit.gd

@@ -0,0 +1,15 @@
+extends Node3D
+class_name TestUnit
+
+var selected: bool = false
+
+@onready var selection_sprite: Sprite3D = $SelectionSprite
+
+
+func _ready() -> void:
+	set_selected(false)
+
+
+func set_selected(on: bool) -> void:
+	selected = on
+	selection_sprite.visible = selected