Add a first-view controller and a bunch of things

1. Replace 4k models with low-poly once
2. Use bare mixamo for testing
3. Add a basic menu
4. Add a map with collisions and spawn areas

Demo/DemoWorld.tscn

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+[gd_scene load_steps=10 format=3 uid="uid://0576fim4xnjw"]
+
+[ext_resource type="Script" path="res://Demo/MainCamera.gd" id="1"]
+[ext_resource type="Script" path="res://addons/Mirror/Mirror/Mirror.gd" id="2"]
+
+[sub_resource type="ProceduralSkyMaterial" id="ProceduralSkyMaterial_omm3q"]
+
+[sub_resource type="Sky" id="Sky_bigpx"]
+sky_material = SubResource("ProceduralSkyMaterial_omm3q")
+
+[sub_resource type="Environment" id="Environment_y6thg"]
+background_mode = 2
+sky = SubResource("Sky_bigpx")
+
+[sub_resource type="SphereMesh" id="4"]
+radius = 1.0
+height = 2.0
+
+[sub_resource type="CapsuleMesh" id="7"]
+radius = 0.33
+height = 1.66
+
+[sub_resource type="FastNoiseLite" id="8"]
+
+[sub_resource type="NoiseTexture2D" id="9"]
+seamless = true
+noise = SubResource("8")
+
+[node name="DemoWorld" type="Node3D"]
+
+[node name="WorldEnvironment" type="WorldEnvironment" parent="."]
+environment = SubResource("Environment_y6thg")
+
+[node name="MeshInstance2" type="MeshInstance3D" parent="."]
+transform = Transform3D(0.4, 0, 0, 0, 0.4, 0, 0, 0, 0.4, 0.311584, -0.508855, 0.519106)
+layers = 2
+mesh = SubResource("4")
+
+[node name="MeshInstance3" type="MeshInstance3D" parent="."]
+transform = Transform3D(0.4, 0, 0, 0, 0.4, 0, 0, 0, 0.4, 0.4, 0.4, 0.773196)
+mesh = SubResource("4")
+
+[node name="MeshInstance4" type="MeshInstance3D" parent="."]
+transform = Transform3D(0.3, 0, 0, 0, 0.3, 0, 0, 0, 0.3, 0.396369, 0.461957, -1.66788)
+mesh = SubResource("4")
+
+[node name="Player" type="Node3D" parent="."]
+transform = Transform3D(0.733279, 0, -0.679928, 0, 1, 0, 0.679928, 0, 0.733279, -3.01042, 0.611678, 3.23258)
+script = ExtResource("1")
+
+[node name="CameraRod" type="Node3D" parent="Player"]
+
+[node name="MainCamera" type="Camera3D" parent="Player/CameraRod"]
+near = 0.3
+
+[node name="MeshInstance3D" type="MeshInstance3D" parent="Player/CameraRod"]
+transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, -0.4, 0)
+mesh = SubResource("7")
+skeleton = NodePath("../../..")
+
+[node name="Mirror" type="Node3D" parent="."]
+script = ExtResource("2")
+ResolutionPerUnit = 200
+MainCamPath = NodePath("../Player/CameraRod/MainCamera")
+MirrorColor = Color(1, 1, 1, 1)
+
+[node name="Mirror2" type="Node3D" parent="."]
+transform = Transform3D(0.658492, 0, -0.752587, 0, 1, 0, 0.752587, 0, 0.658492, 2.4934, 0, 0.705538)
+script = ExtResource("2")
+ResolutionPerUnit = 200
+MainCamPath = NodePath("../Player/CameraRod/MainCamera")
+MirrorDistortion = 20
+DistortionTexture = SubResource("9")

Demo/MainCamera.gd

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+extends Node3D
+
+class_name TpsCamera
+
+
+# Nodes
+@onready var camera_pivot : Node3D = self
+@onready var camera_rod : Node3D = get_node("CameraRod")
+@onready var camera : Camera3D = get_node("CameraRod/MainCamera")
+
+# Movement
+@export var mouse_sensitivity : float = 0.15
+@export var camera_min_vertical_rotation : float = -85.0
+@export var camera_max_vertical_rotation : float = 85.0
+
+# zooming
+@export var camera_zoom : float = 3.0 : set = set_camera_zoom
+func set_camera_zoom(value): camera_zoom = clamp(value, camera_min_zoom_distance, camera_max_zoom_distance)
+@export var camera_min_zoom_distance : float = 3.0
+@export var camera_max_zoom_distance : float = 15.0
+@export var camera_zoom_step : float = 0.5
+
+# Cursor
+@onready var is_cursor_visible : get = get_is_cursor_visible, set = set_is_cursor_visible
+func set_is_cursor_visible(value): Input.set_mouse_mode(Input.MOUSE_MODE_VISIBLE if value else Input.MOUSE_MODE_CAPTURED)
+func get_is_cursor_visible(): return Input.get_mouse_mode() == Input.MOUSE_MODE_VISIBLE
+
+var speed = 0.1
+
+
+#####################
+#  Default methods  #
+#####################
+
+func _ready() -> void:
+	self.is_cursor_visible = false
+
+
+func _process(delta: float) -> void:
+	process_basic_input()
+	
+	if Input.is_action_pressed("ui_up"):
+		self.global_transform.origin += - $CameraRod/MainCamera.global_transform.basis.z * speed
+	if Input.is_action_pressed("ui_down"):
+		self.global_transform.origin += $CameraRod/MainCamera.global_transform.basis.z * speed
+	if Input.is_action_pressed("ui_right"):
+		self.global_transform.origin += $CameraRod/MainCamera.global_transform.basis.x * speed
+	if Input.is_action_pressed("ui_left"):
+		self.global_transform.origin += - $CameraRod/MainCamera.global_transform.basis.x * speed
+	#self.transform.origin = lerp(self.transform.origin, player.transform.origin, 0.1)
+
+
+func _unhandled_input(event: InputEvent) -> void:
+	process_mouse_input(event)
+
+
+
+####################
+#  Camera3D methods  #
+####################
+
+
+func rotate_camera(camera_direction : Vector2) -> void:
+	self.rotation.y += -camera_direction.x
+	# Vertical rotation
+	camera_rod.rotate_x(-camera_direction.y)
+	
+	# Limit vertical rotation
+	camera_rod.rotation_degrees.x = clamp(
+		camera_rod.rotation_degrees.x,
+		camera_min_vertical_rotation, camera_max_vertical_rotation
+	)
+	
+	
+
+func toggle_cursor_visibility() -> void:
+	self.is_cursor_visible = !self.is_cursor_visible
+
+
+
+###################
+#  Input methods  #
+###################
+
+func process_basic_input():
+	if Input.is_action_just_pressed("ui_cancel"):
+		toggle_cursor_visibility()
+
+
+func process_mouse_input(event : InputEvent) -> void:
+	# Cursor movement
+	if event is InputEventMouseMotion:
+		var camera_direction = Vector2(
+			deg_to_rad(event.relative.x * mouse_sensitivity),
+			deg_to_rad(event.relative.y * mouse_sensitivity)
+		)
+		if !self.is_cursor_visible:
+			rotate_camera(camera_direction)
+	
+	# Scrolling
+	elif event is InputEventMouseButton:
+		if event.is_pressed() and not self.is_cursor_visible:
+			if event.button_index == MOUSE_BUTTON_WHEEL_UP:
+				self.camera_zoom -= camera_zoom_step
+			if event.button_index == MOUSE_BUTTON_WHEEL_DOWN:
+				self.camera_zoom += camera_zoom_step
+	
+

Demo/default_env.tres

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+[gd_resource type="Environment" load_steps=2 format=2]
+
+[sub_resource type="Sky" id=1]
+
+[resource]
+background_mode = 2
+background_sky = SubResource( 1 )