Godot Genre Racing

# arcade_vehicle_controller.gd
extends CharacterBody3D
class_name ArcadeVehicleController

# Raycast-Based Arcade Vehicle Controller
# Predictable, tight steering and suspension without the complexity of VehicleBody3D.

@export var engine_force := 40.0
@export var steering_limit := 0.4
@export var suspension_rest_dist := 0.5
@export var suspension_stiffness := 30.0
@export var suspension_damping := 2.0

func _physics_process(delta: float) -> void:
    var input_dir = Input.get_vector(&"move_left", &"move_right", &"move_forward", &"move_back")
    
    # Steering
    rotation.y -= input_dir.x * steering_limit * delta * (velocity.length() * 0.1)
    
    # Simple Engine Acceleration
    var forward_dir = -global_transform.basis.z
    velocity += forward_dir * input_dir.y * engine_force * delta
    
    # Friction/Drag
    velocity *= 0.98
    
    move_and_slide()

# skills/genre-racing/scripts/arcade_vehicle_physics.gd
extends VehicleBody3D

## Arcade Vehicle Physics (Expert Pattern)
## Custom tweaks for VehicleBody3D to make it feel "fun" rather than realistic.
## Increases gravity, modifies friction for drifting, and handles air control.

class_name ArcadeVehiclePhysics

@export var gravity_scale: float = 3.0 # Arcade cars need to stick to the ground
@export var air_control: float = 0.5
@export var drift_friction_slip: float = 1.0
@export var normal_friction_slip: float = 3.0

var is_drifting: bool = false

func _ready() -> void:
    # Setup wheels
    for child in get_children():
        if child is VehicleWheel3D:
             child.wheel_friction_slip = normal_friction_slip

func _physics_process(delta: float) -> void:
    # 1. Custom Gravity
    if not is_on_floor():
        apply_central_force(Vector3.DOWN * 9.8 * gravity_scale * mass)
        
        # 2. Air Control (Tilt)
        var pitch = Input.get_axis("forward", "back") * air_control
        var roll = Input.get_axis("left", "right") * air_control
        apply_torque(transform.basis.x * pitch + transform.basis.z * roll)
        
    # 3. Drifting Logic
    if Input.is_action_pressed("drift"):
        is_drifting = true
        for child in get_children():
            if child is VehicleWheel3D and not child.use_as_steering: # Rear wheels usually
                child.wheel_friction_slip = drift_friction_slip
    else:
        is_drifting = false
        for child in get_children():
            if child is VehicleWheel3D:
                child.wheel_friction_slip = normal_friction_slip

func is_on_floor() -> bool:
    # Simple raycast check or wheel contact check
    for child in get_children():
        if child is VehicleWheel3D and child.is_colliding():
            return true
    return false

## EXPERT USAGE:
## Attach to VehicleBody3D. Map 'drift', 'forward', 'back', 'left', 'right' actions.

# engine_audio_controller.gd
extends AudioStreamPlayer3D
class_name EngineAudioController

# Engine Audio Simulation (Pitch-Based RPM)
# Maps vehicle speed/RPM to audio pitch for realistic revving.

@export var min_pitch := 0.5
@export var max_pitch := 2.5
@export var speed_scale := 0.05

func update_engine_sound(current_speed: float) -> void:
    # Pattern: Calculate pitch based on speed/RPM curve.
    var target_pitch = min_pitch + (current_speed * speed_scale)
    pitch_scale = lerp(pitch_scale, clamp(target_pitch, min_pitch, max_pitch), 0.1)

# force_feedback_router.gd
extends Node
class_name ForceFeedbackRouter

# Force-Feedback and Rumble Coordination
# Manages controller vibration based on collisions and track surface.

func trigger_impact(intensity: float, duration: float) -> void:
    # Pattern: Use Input.start_joy_vibration for localized haptics.
    var device_id = 0 # Assume first controller
    Input.start_joy_vibration(device_id, intensity * 0.5, intensity, duration)

func shake_on_surface(surface_type: StringName) -> void:
    match surface_type:
        &"grass":
            Input.start_joy_vibration(0, 0.1, 0.1, 0.1)
        &"rough":
            Input.start_joy_vibration(0, 0.3, 0.3, 0.1)

# ghost_recorder.gd
extends Node
class_name GhostRecorder

# Ghost Car Recording (Compact Serialization)
# Caches position and rotation at intervals for low-memory replay loops.

var recording: Array[Dictionary] = []
var record_interval := 0.1
var time_since_last_record := 0.0

func _physics_process(delta: float) -> void:
    time_since_last_record += delta
    if time_since_last_record >= record_interval:
        time_since_last_record = 0.0
        _record_snapshot()

func _record_snapshot() -> void:
    var parent = get_parent() as Node3D
    if not parent: return
    
    recording.append({
        "p": parent.global_position,
        "r": parent.global_quaternion
    })

func save_ghost(path: String) -> void:
    var file = FileAccess.open(path, FileAccess.WRITE)
    # Pattern: Use binary store_var for speed and compactness.
    file.store_var(recording)
    file.close()

extends Node
class_name LapCheckpointManager

## Expert Lap Manager (Godot 4.6).
## Sequence-validated checkpoints to prevent cheating.

signal lap_completed(total_laps: int)

var next_expected_id: int = 1
var current_lap: int = 0
@export var total_checkpoints: int = 4

func _on_checkpoint_passed(id: int) -> void:
	if id == next_expected_id:
		if id == total_checkpoints:
			next_expected_id = 1
			current_lap += 1
			lap_completed.emit(current_lap)
		else:
			next_expected_id += 1
	else:
		print("Cheated or skipped! Expected %d, got %d" % [next_expected_id, id])

## [SKILL NOTICE]: Use 'Sequence-ID' validation (1 -> 2 -> 3) rather 
## than just distance to prevent players from bypassing the track.

# lap_tracker.gd
extends Node
class_name LapTracker

# Lap/Time Tracking with Validation
# Sequential checkpoint checks to prevent "cheating" by reversing through the start.

signal lap_completed(total_time: float)

var current_lap := 1
var next_checkpoint_idx := 0
var lap_start_time := 0.0
var checkpoints: Array[Node3D] = []

func _ready() -> void:
    lap_start_time = Time.get_ticks_msec() / 1000.0

func on_checkpoint_passed(checkpoint: Node3D) -> void:
    var idx = checkpoints.find(checkpoint)
    
    # Pattern: Validate sequence to stop lap-shortcuts.
    if idx == next_checkpoint_idx:
        next_checkpoint_idx += 1
        if next_checkpoint_idx >= checkpoints.size():
            _complete_lap()

func _complete_lap() -> void:
    var end_time = Time.get_ticks_msec() / 1000.0
    var lap_time = end_time - lap_start_time
    lap_completed.emit(lap_time)
    
    current_lap += 1
    next_checkpoint_idx = 0
    lap_start_time = end_time

# minimap_icon_projector.gd
extends Control
class_name MinimapIconProjector

# Minimap Projection (Camera3D Unprojection)
# Maps 3D global positions to a 2D UI minimap rectangle.

@export var map_rect: Rect2
@export var track_bounds: Rect2
@export var target_node: Node3D

func _process(_delta: float) -> void:
    if not target_node: return
    
    var pos_3d = target_node.global_position
    
    # Pattern: Normalize world position within track bounds then scale to UI rect.
    var nx = inv_lerp(track_bounds.position.x, track_bounds.end.x, pos_3d.x)
    var ny = inv_lerp(track_bounds.position.y, track_bounds.end.y, pos_3d.z)
    
    position.x = map_rect.position.x + (nx * map_rect.size.x)
    position.y = map_rect.position.y + (ny * map_rect.size.y)

# racing_checkpoint.gd
extends Area3D
class_name RacingCheckpoint

# Sequential Checkpoint Validation Gate
# Signal-based tracker for lap progression.

@export var checkpoint_index := 0
signal crossed(node: Node3D, idx: int)

func _on_body_entered(body: Node3D) -> void:
    if body.is_in_group(&"player"):
        crossed.emit(body, checkpoint_index)

# raycast_suspension.gd
extends RayCast3D
class_name RaycastSuspension

# Physics-Based Suspension (Raycast Spring)
# Calculates upward force based on compression to simulate vehicle bounce.

@export var stiffness := 40.0
@export var damping := 3.0
var last_compression := 0.0

func get_spring_force(delta: float) -> float:
    if is_colliding():
        var contact_dist = (get_collision_point() - global_position).length()
        var compression = clamp(target_position.length() - contact_dist, 0.0, 1.0)
        
        # Spring force
        var force = compression * stiffness
        # Damping (velocity of compression)
        var vel = (compression - last_compression) / delta
        force += vel * damping
        
        last_compression = compression
        return force
    
    last_compression = 0.0
    return 0.0

extends RigidBody3D
class_name RaycastVehicleController

## Expert Raycast Vehicle (Godot 4.6).
## Manual suspension and friction for crisp arcade feel.

@export var spring_stiffness: float = 30.0
@export var spring_damping: float = 2.0
@export var spring_rest_length: float = 0.5
@export var tire_grip: float = 2.0

@onready var wheels: Array[RayCast3D] = [$W1, $W2, $W3, $W4]

func _physics_process(delta: float) -> void:
	for wheel in wheels:
		if wheel.is_colliding():
			var depth = spring_rest_length - wheel.get_collision_point().distance_to(wheel.global_position)
			var spring_force = (depth * spring_stiffness)
			
			# Apply upward force at wheel position
			apply_force(Vector3.UP * spring_force, wheel.position)
			
			# Lateral Friction (Grip)
			var lateral_vel = global_transform.basis.x.dot(get_velocity_at_local_point(wheel.position))
			apply_force(-global_transform.basis.x * lateral_vel * tire_grip, wheel.position)

## [SKILL NOTICE]: Avoid 'VehicleBody3D' for arcade feel. Manually 
## calculate suspension via RayCast3D and apply forces to a RigidBody3D.

# skid_mark_emitter.gd
extends Node3D
class_name SkidMarkEmitter

# Tire Smoke and Skid Marks
# Triggers visual effects based on side-slip or drift state.

@export var smoke_particles: GPUParticles3D
@export var threshold := 2.0

func _physics_process(_delta: float) -> void:
    var car = get_parent() as CharacterBody3D
    if not car: return
    
    # Calculate lateral velocity (drifting)
    var side_vel = car.global_transform.basis.x.dot(car.velocity)
    
    # Pattern: Only emit when exceeding a slip threshold to save draw calls.
    if abs(side_vel) > threshold:
        if smoke_particles: smoke_particles.emitting = true
        _place_skid_mark()
    else:
        if smoke_particles: smoke_particles.emitting = false

func _place_skid_mark() -> void:
    # Implementation for spawning Mesh/Trail nodes here.
    pass

# slipstream_handler.gd
extends Area3D
class_name SlipstreamHandler

# Slipstream/Drafting Mechanics
# Provides a velocity boost when following a lead car within a specific cone.

@export var boost_multiplier := 1.2
@export var max_angle_deg := 15.0

func _on_area_entered(area: Area3D) -> void:
    var parent = get_parent()
    if area.get_parent() is ArcadeVehicleController:
        var lead_car = area.get_parent()
        var to_lead = (lead_car.global_position - parent.global_position).normalized()
        var dot = to_lead.dot(-lead_car.global_transform.basis.z)
        
        # Pattern: Verify dot product to ensure we are actually behind the car.
        if dot > cos(deg_to_rad(max_angle_deg)):
            _apply_draft_boost(parent)

func _apply_draft_boost(car: Node3D) -> void:
    if "velocity" in car:
        car.velocity *= boost_multiplier

# skills/genre-racing/scripts/spline_ai_controller.gd
extends VehicleBody3D

## Spline AI Controller (Expert Pattern)
## Racing AI that follows a Path3D with look-ahead steering and rubber-banding.

class_name SplineAIController

@export var path: Path3D
@export var max_speed: float = 50.0 # m/s
@export var rubber_band_strength: float = 0.1
@export var target_node: Node3D # The player (for rubber banding)

var current_offset: float = 0.0
var look_ahead: float = 20.0

func _physics_process(delta: float) -> void:
    if not path: return
    
    # 1. Find Closest Point on Curve
    var curve = path.curve
    # Approximating offset update based on speed (better than searching nearest every frame)
    current_offset += linear_velocity.length() * delta
    if current_offset >= curve.get_baked_length():
        current_offset -= curve.get_baked_length() # Loop
        
    # 2. Calculate Steering Target (Look Ahead)
    var target_offset = current_offset + look_ahead
    if target_offset >= curve.get_baked_length():
        target_offset -= curve.get_baked_length()
        
    var target_pos = path.to_global(curve.sample_baked(target_offset))
    var local_target = to_local(target_pos)
    
    # 3. Apply Steering
    # Simple P-controller: steer towards x component of local target
    steering = clamp(local_target.x * 0.1, -0.4, 0.4)
    
    # 4. Apply Throttle / Rubber Banding
    var desired_speed = max_speed
    if target_node:
        var dist = global_position.distance_to(target_node.global_position)
        # If behind, speed up
        # We need to know track position to know who is ahead, simple distance check is flawed on loops
        # Assuming linear track progress for simple rubber band example:
        if current_offset < _get_node_track_offset(target_node): 
            desired_speed *= (1.0 + rubber_band_strength)
        else:
            desired_speed *= (1.0 - rubber_band_strength)
            
    if linear_velocity.length() < desired_speed:
        engine_force = 1000.0
        brake = 0.0
    else:
        engine_force = 0.0
        brake = 10.0

func _get_node_track_offset(node: Node3D) -> float:
    # Helper to find approx offset of player
    return path.curve.get_closest_offset(path.to_local(node.global_position))

## EXPERT USAGE:
## Assign a Path3D (the racing line). Adjust look_ahead for smoother turns.

extends Path3D
class_name SplineTrackSpawner

## Expert Track Spawner (Godot 4.6).
## Places obstacles/points perfectly along a Curve3D.

@export var obstacle_scene: PackedScene
@export var spacing: float = 10.0

func generate_obstacles() -> void:
	var curve: Curve3D = self.curve
	var length = curve.get_baked_length()
	var current_offset = 0.0
	
	while current_offset < length:
		var pos = curve.sample_baked(current_offset)
		var up = curve.sample_baked_up_vector(current_offset)
		
		var obj = obstacle_scene.instantiate()
		add_child(obj)
		obj.global_position = global_position + pos
		obj.look_at(obj.global_position + curve.sample_baked(current_offset + 0.1), up)
		
		current_offset += spacing

## [SKILL NOTICE]: Use 'sample_baked_up_vector()' when spawning items 
## on splines to ensure they respect the track's banking and slopes.