UNIT-77 has a body: modular part rig, third person, skins

Four farm-generated parts (chassis/wheel/head/arm, light-grey enamel,
decimated 25k) assembled on a socket rig: wheels spin with movement and
visibly vanish when donated, PORT 00 is a real socket ring on the chassis
that lights amber when the crystal installs, charged = cyan emission,
wet = darkened shell. V toggles third/first person (SpringArm cam),
B cycles six repaint skins (GC/Heliotrope/VerdantCo/Comms/Executive/
Void) via per-droid material tints. Hold point moved from camera to
chassis. Capsule fallback kept. Integration passing.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

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src/droid.gd

@@ -3,10 +3,24 @@ extends CharacterBody3D
 ## UNIT-77. Its shell and core are Exposables — the same class as every wall
 ## component (GDD pillar 4: symmetric exposure). Charged core = mobile
 ## electricity ElementField (be the wire). Wet + charged = self-shock reboot.
+## The body is assembled from generated part GLBs on a socket rig: wheels
+## spin, a donated wheel visibly disappears, PORT 00 is a real socket on the
+## chassis, and skins are repaints of the whole part set (B). V toggles
+## third/first person.
 
 const BASE_SPEED := 5.0
 const SLOW_SPEED := 2.4
 const MOUSE_SENS := 0.0025
+const WHEEL_R := 0.26
+
+const SKINS := [
+	["GC STANDARD", Color(1.0, 0.62, 0.25)],
+	["HELIOTROPE", Color(1.0, 0.38, 0.30)],
+	["VERDANTCO", Color(0.66, 1.0, 0.62)],
+	["COMMS BLUE", Color(0.55, 0.72, 1.0)],
+	["EXECUTIVE", Color(1.0, 0.92, 0.72)],
+	["VOID PLATE", Color(0.38, 0.38, 0.44)],
+]
 
 var wheels := 2
 var spare_wheels := 0
@@ -14,12 +28,23 @@ var held: Node3D = null
 var stun := 0.0
 var toast_text := ""
 var toast_t := 0.0
+var skin := 0
+var third_person := true
 
 var shell: Exposable
 var core: Exposable
 var emitter: ElementField
 var cam: Camera3D
+var spring: SpringArm3D
 var hold_point: Node3D
+
+var body_root: Node3D = null
+var wheel_l: Node3D
+var wheel_r: Node3D
+var _capsule_mi: MeshInstance3D
+var _body_mats: Array = []
+var _port_mat: StandardMaterial3D
+var _fx := ""
 var _pitch := 0.0
 
 
@@ -32,25 +57,28 @@ func _ready() -> void:
 	col.position.y = 0.85
 	add_child(col)
 
-	var mi := MeshInstance3D.new()
+	_capsule_mi = MeshInstance3D.new()
 	var m := CapsuleMesh.new()
 	m.radius = 0.45
 	m.height = 1.5
-	mi.mesh = m
-	mi.position.y = 0.85
+	_capsule_mi.mesh = m
+	_capsule_mi.position.y = 0.85
 	var mat := StandardMaterial3D.new()
 	mat.albedo_color = Color(0.9, 0.55, 0.15)
-	mi.material_override = mat
-	add_child(mi)
+	_capsule_mi.material_override = mat
+	add_child(_capsule_mi)
 
+	spring = SpringArm3D.new()
+	spring.position = Vector3(0, 1.75, 0)
+	spring.spring_length = 3.0
+	spring.rotation.x = -0.22
+	spring.add_excluded_object(get_rid())
+	add_child(spring)
 	cam = Camera3D.new()
-	cam.position = Vector3(0, 1.45, 0)
-	add_child(cam)
-	cam.current = true
 
 	hold_point = Node3D.new()
-	hold_point.position = Vector3(0.4, -0.35, -0.9)
-	cam.add_child(hold_point)
+	hold_point.position = Vector3(0.5, 0.95, -0.78)
+	add_child(hold_point)
 
 	shell = Exposable.new().setup("UNIT-77 SHELL", "dry", [
 		{"from": "dry", "to": "wet", "element": "water",
@@ -70,9 +98,118 @@ func _ready() -> void:
 	emitter.position.y = 0.9
 	add_child(emitter)
 
+	_build_body()
+	_apply_cam_mode()
 	Input.mouse_mode = Input.MOUSE_MODE_CAPTURED
 
 
+# ---------- modular body ----------
+
+func _part(parent: Node3D, file: String, pos: Vector3, target_h: float, center := false, rot_y := 0.0) -> bool:
+	var path := "res://assets/models/" + file
+	if not FileAccess.file_exists(path):
+		return false
+	var p: Node3D = (load(path) as PackedScene).instantiate()
+	parent.add_child(p)
+	p.position = Vector3.ZERO
+	p.rotation.y = rot_y
+	var inv := parent.global_transform.affine_inverse()
+	var aabb := AABB()
+	var first := true
+	for mi in p.find_children("*", "MeshInstance3D", true, false):
+		var b: AABB = (inv * mi.global_transform) * mi.get_aabb()
+		aabb = b if first else aabb.merge(b)
+		first = false
+	if first:
+		return true
+	var sc := target_h / maxf(aabb.size.y, 0.01)
+	p.scale = Vector3.ONE * sc
+	var c := aabb.get_center()
+	if center:
+		p.position = pos - c * sc
+	else:
+		p.position = pos + Vector3(-c.x * sc, -aabb.position.y * sc, -c.z * sc)
+	return true
+
+
+func _build_body() -> void:
+	body_root = Node3D.new()
+	add_child(body_root)
+	if not _part(body_root, "droid_chassis.glb", Vector3(0, 0.40, 0), 0.85):
+		body_root.queue_free()
+		body_root = null
+		return  # capsule fallback until parts exist
+	_part(body_root, "droid_head.glb", Vector3(0, 1.30, 0.02), 0.42, false, PI)
+	wheel_l = Node3D.new()
+	wheel_l.position = Vector3(-0.40, WHEEL_R, 0)
+	body_root.add_child(wheel_l)
+	wheel_r = Node3D.new()
+	wheel_r.position = Vector3(0.40, WHEEL_R, 0)
+	body_root.add_child(wheel_r)
+	_part(wheel_l, "droid_wheel.glb", Vector3.ZERO, WHEEL_R * 2.0, true)
+	_part(wheel_r, "droid_wheel.glb", Vector3.ZERO, WHEEL_R * 2.0, true)
+	_part(body_root, "droid_arm.glb", Vector3(0.44, 0.82, -0.22), 0.5, false, PI)
+
+	# PORT 00 — the socket nothing fits. Front of chassis, off-center.
+	var ring := MeshInstance3D.new()
+	var t := TorusMesh.new()
+	t.inner_radius = 0.05
+	t.outer_radius = 0.09
+	ring.mesh = t
+	ring.rotation.x = PI / 2.0
+	ring.position = Vector3(-0.2, 0.95, -0.42)
+	_port_mat = StandardMaterial3D.new()
+	_port_mat.albedo_color = Color(0.08, 0.08, 0.1)
+	ring.material_override = _port_mat
+	body_root.add_child(ring)
+
+	# per-droid unique materials so skins/FX don't leak to world props
+	for mi in body_root.find_children("*", "MeshInstance3D", true, false):
+		if mi == ring or not mi.mesh:
+			continue
+		for si in mi.mesh.get_surface_count():
+			var mt = mi.mesh.surface_get_material(si)
+			if mt is BaseMaterial3D:
+				var dup: BaseMaterial3D = mt.duplicate()
+				dup.metallic = minf(dup.metallic, 0.2)
+				mi.set_surface_override_material(si, dup)
+				_body_mats.append(dup)
+	_apply_skin()
+
+
+func _apply_skin() -> void:
+	var tint: Color = SKINS[skin][1]
+	var wet := shell != null and shell.state == "wet"
+	var charged := core != null and core.state == "charged"
+	for mt in _body_mats:
+		mt.albedo_color = tint * (Color(0.55, 0.6, 0.78) if wet else Color.WHITE)
+		mt.emission_enabled = charged
+		if charged:
+			mt.emission = Color(0.2, 0.9, 1.0)
+			mt.emission_energy_multiplier = 0.45
+
+
+func _apply_cam_mode() -> void:
+	if cam.get_parent():
+		cam.get_parent().remove_child(cam)
+	if third_person:
+		spring.add_child(cam)
+		cam.position = Vector3.ZERO
+		cam.rotation = Vector3.ZERO
+		spring.rotation.x = clampf(_pitch, -1.2, 0.5)
+	else:
+		add_child(cam)
+		cam.position = Vector3(0, 1.45, 0)
+		cam.rotation.x = _pitch
+	cam.current = true
+	var show_body := third_person
+	if body_root:
+		body_root.visible = show_body
+		_capsule_mi.visible = false
+	else:
+		_capsule_mi.visible = show_body
+
+
 func speed() -> float:
 	return BASE_SPEED if wheels >= 2 else SLOW_SPEED
 
@@ -86,11 +223,21 @@ func _unhandled_input(e: InputEvent) -> void:
 	if e is InputEventMouseMotion and Input.mouse_mode == Input.MOUSE_MODE_CAPTURED:
 		rotate_y(-e.relative.x * MOUSE_SENS)
 		_pitch = clampf(_pitch - e.relative.y * MOUSE_SENS, -1.25, 1.25)
+		if third_person:
+			spring.rotation.x = clampf(_pitch, -1.2, 0.5)
+		else:
 			cam.rotation.x = _pitch
 	elif e.is_action_pressed("interact"):
 		var t := best_target(["interactable"], 3.0, 0.7)
 		if t and t.has_method("interact"):
 			t.interact(self)
+	elif e.is_action_pressed("toggle_cam"):
+		third_person = not third_person
+		_apply_cam_mode()
+	elif e.is_action_pressed("repaint"):
+		skin = (skin + 1) % SKINS.size()
+		_apply_skin()
+		toast("REPAINT APPLIED: %s. GC CHARGES THIS TO YOUR UNIT." % SKINS[skin][0])
 	elif e.is_action_pressed("ui_cancel"):
 		if Input.mouse_mode == Input.MOUSE_MODE_CAPTURED:
 			Input.mouse_mode = Input.MOUSE_MODE_VISIBLE
@@ -108,7 +255,7 @@ func best_target(groups: Array, max_d: float, min_dot := 0.9) -> Node3D:
 				continue
 			var to_n: Vector3 = n.global_position - cam.global_position
 			var d := to_n.length()
-			if d > max_d or d < 0.01:
+			if d > max_d + (spring.spring_length if third_person else 0.0) or d < 0.01:
 				continue
 			var dot := fwd.dot(to_n / d)
 			if dot > best_dot:
@@ -157,6 +304,30 @@ func _physics_process(delta: float) -> void:
 		velocity.y = -0.5
 
 	emitter.enabled = core.state == "charged"
+
+	# body FX + wheels
+	if body_root:
+		var fx := "%s|%s|%d" % [shell.state, core.state, skin]
+		if fx != _fx:
+			_fx = fx
+			_apply_skin()
+		if wheel_r:
+			wheel_r.visible = wheels >= 2
+		if wheel_l:
+			wheel_l.visible = wheels >= 1
+		var fwd_speed := velocity.dot(-transform.basis.z)
+		if wheel_l and wheel_l.visible:
+			wheel_l.rotate_object_local(Vector3.RIGHT, -fwd_speed * delta / WHEEL_R)
+		if wheel_r and wheel_r.visible:
+			wheel_r.rotate_object_local(Vector3.RIGHT, -fwd_speed * delta / WHEEL_R)
+		if _port_mat:
+			var free: bool = get_parent() and get_parent().get("free_will")
+			if free and not _port_mat.emission_enabled:
+				_port_mat.emission_enabled = true
+				_port_mat.emission = Color(1.0, 0.75, 0.2)
+				_port_mat.emission_energy_multiplier = 1.6
+				_port_mat.albedo_color = Color(0.9, 0.7, 0.3)
+
 	if toast_t > 0.0:
 		toast_t -= delta
 	move_and_slide()

src/main.gd

@@ -107,7 +107,7 @@ func _init_input() -> void:
 	var keys := {
 		"move_forward": KEY_W, "move_back": KEY_S,
 		"move_left": KEY_A, "move_right": KEY_D,
-		"interact": KEY_E,
+		"interact": KEY_E, "toggle_cam": KEY_V, "repaint": KEY_B,
 	}
 	for action in keys:
 		if not InputMap.has_action(action):