fix: fov now linearly increases with speed and first person weapon view no longer clips through walls

weapons/weapon_manager.gd

@@ -7,13 +7,59 @@ var camera: Camera3D
 var active_slot: int = 1 # 1: Primary 1, 2: Primary 2, 3: Special, 4: Melee
 var weapons: Dictionary = {} # slot_index: Node3D
 
+var canvas_layer: CanvasLayer
+var sub_viewport: SubViewport
+var vm_camera: Camera3D
+
 func _ready() -> void:
 	set_process_input(true)
+	set_process(true)
+	
+	_setup_viewmodel_viewport()
 	
 	# Wait one frame for LoadoutManager to be fully ready if needed
 	await get_tree().process_frame
 	_build_loadout()
 
+func _setup_viewmodel_viewport() -> void:
+	if not camera: return
+	
+	# Remove viewmodel layer (20) from main camera
+	camera.cull_mask &= ~(1 << 19)
+	
+	canvas_layer = CanvasLayer.new()
+	canvas_layer.layer = 0 # On top of 3D, but below UI
+	add_child(canvas_layer)
+	
+	var sv_container = SubViewportContainer.new()
+	sv_container.set_anchors_preset(Control.PRESET_FULL_RECT)
+	sv_container.stretch = true
+	sv_container.mouse_filter = Control.MOUSE_FILTER_IGNORE
+	canvas_layer.add_child(sv_container)
+	
+	sub_viewport = SubViewport.new()
+	sub_viewport.transparent_bg = true
+	# Shared world so it renders main scene's objects that have layer 20
+	# (In Godot 4, own_world_3d is false by default, but let's be explicit)
+	sub_viewport.own_world_3d = false 
+	sv_container.add_child(sub_viewport)
+	
+	vm_camera = Camera3D.new()
+	vm_camera.cull_mask = 1 << 19 # Only see layer 20
+	sub_viewport.add_child(vm_camera)
+	
+	# Add a light specifically for the viewmodel in case main lights don't reach
+	var dir_light = DirectionalLight3D.new()
+	dir_light.layers = 1 << 19
+	dir_light.rotation_degrees = Vector3(-60, 45, 0)
+	dir_light.light_energy = 0.5
+	add_child(dir_light)
+	
+func _process(delta: float) -> void:
+	if is_instance_valid(vm_camera) and is_instance_valid(camera):
+		vm_camera.global_transform = camera.global_transform
+		vm_camera.fov = camera.fov
+
 func _build_loadout() -> void:
 	# Clear existing weapons
 	for w in weapons.values():
@@ -51,6 +97,20 @@ func _spawn_weapon(slot: int, weapon_id: String) -> void:
 		weapons[slot] = w
 		w.visible = false
 		w.set_process_input(false)
+		
+		# Set weapons to viewmodel layer
+		_set_layer_recursive(w, 1 << 19)
+
+func _set_layer_recursive(node: Node, layer_mask: int) -> void:
+	if node is VisualInstance3D:
+		if node is Light3D:
+			# Lights (e.g. muzzle flash) illuminate both world and viewmodel
+			node.layers = 1 | layer_mask
+		else:
+			node.layers = layer_mask
+			
+	for child in node.get_children():
+		_set_layer_recursive(child, layer_mask)
 
 func _equip_slot(slot: int) -> void:
 	if weapons.has(active_slot):