Added 'tire trails' to the vehicle.

Objects/Trail/Trail.gd

+extends Position2D
+
+
+export var max_length : int = 100 					setget _set_max_length
+export var distance_between_points : float = 10		setget _set_distance_between_points
+export var width : float = 2						setget _set_width
+export (Curve) var width_curve = null				setget _set_width_curve
+export (Color) var default_color = Color("6680ff")	setget _set_default_color
+
+
+onready var trailline_node = $TrailLine
+
+
+func _set_max_length(l : int) -> void:
+	if l > 0:
+		max_length = l
+		if trailline_node:
+			trailline_node.max_length = max_length
+
+
+func _set_distance_between_points(d : float) -> void:
+	if d > 0.0:
+		distance_between_points = d
+		if trailline_node:
+			trailline_node.distance_between_points = distance_between_points
+
+func _set_width(w : float) -> void:
+	if w > 0:
+		width = w
+		if trailline_node:
+			trailline_node.width = w
+
+func _set_width_curve(c) -> void:
+	width_curve = c
+	if trailline_node:
+		trailline_node.width_curve = c
+
+func _set_default_color(c : Color) -> void:
+	default_color = c
+	if trailline_node:
+		trailline_node.default_color = c
+
+func _ready():
+	trailline_node.max_length = max_length
+	trailline_node.distance_between_points = distance_between_points
+	trailline_node.width = width
+	trailline_node.width_curve = width_curve
+	trailline_node.default_color = default_color
+
+
+
+

Objects/Trail/Trail.tscn

+[gd_scene load_steps=3 format=2]
+
+[ext_resource path="res://Objects/Trail/TrailLine.gd" type="Script" id=1]
+[ext_resource path="res://Objects/Trail/Trail.gd" type="Script" id=2]
+
+[node name="Trail" type="Position2D"]
+script = ExtResource( 2 )
+
+[node name="TrailLine" type="Line2D" parent="."]
+default_color = Color( 0.4, 0.501961, 1, 1 )
+script = ExtResource( 1 )
+
+[node name="Timer" type="Timer" parent="TrailLine"]
+one_shot = true
+
+[connection signal="timeout" from="TrailLine/Timer" to="TrailLine" method="_on_decay_timeout"]

Objects/Trail/TrailLine.gd

+extends Line2D
+
+
+export var max_length : int = 100 setget _set_max_length
+export var distance_between_points : float = 10
+export var decay_time : float = 0.1 setget _set_decay_time
+
+var last_point = null
+onready var parent = get_parent()
+onready var timer = $Timer
+
+func _set_max_length(l : int) -> void:
+	if l > 0:
+		max_length = l
+
+func _set_decay_time(d : float) -> void:
+	if d >= 0:
+		decay_time = 0
+
+
+func _ready():
+	set_as_toplevel(true)
+	show_behind_parent = true
+	_reset_timer()
+
+func _process(delta):
+	rotation = parent.rotation
+	if points.size() < max_length:
+		var point = _get_point()
+		if point != null:
+			add_point(point)
+	if points.size() >= max_length:
+		remove_point(0)
+
+func _get_point():
+	var point = parent.global_position
+	if last_point != null and point.distance_to(last_point) < distance_between_points:
+		return null
+	last_point = point
+	return point
+
+func _reset_timer():
+	if decay_time > 0:
+		timer.stop()
+		timer.start(decay_time)
+
+
+func _on_decay_timeout():
+	if points.size() > 0:
+		remove_point(0)
+	_reset_timer()

Objects/Vehicle/Tire_Curve_Basic.tres

+[gd_resource type="Curve" format=2]
+
+[resource]
+max_value = 3.0
+_data = [ Vector2( 0, 0 ), 0.0, 0.0674788, 0, 0, Vector2( 0.288889, 1.93636 ), 5.34545, 5.34545, 0, 0, Vector2( 1, 3 ), 0.145454, 0.0, 0, 0 ]

Objects/Vehicle/Vehicle.gd

 
 export var camera_enabled : bool = false	setget _set_camera_enabled
 export var forward_axel : float = 10 		setget _set_forward_axel
+export var forward_axel_length : float = 10	setget _set_forward_axel_length
 export var rear_axel : float = 10 			setget _set_rear_axel
+export var rear_axel_length : float = 10	setget _set_rear_axel_length
 export (float, 0.0, 1.0, 0.001) var traction_fast = 0.1
 export (float, 0.0, 1.0, 0.001) var traction_slow = 0.7
 export var traction_slow_speed : float = 100.0	setget _set_traction_slow_speed
 
 onready var camera = $Camera2D
 
+onready var trail_fd = $Trail_FD
+onready var trail_fp = $Trail_FP
+onready var trail_rd = $Trail_RD
+onready var trail_rp = $Trail_RP
+
 # -----------------------------------------------------------------------------
 # Setter/Getter Methods
 # -----------------------------------------------------------------------------
 func _set_forward_axel(a : float) -> void:
 	if a > 0:
 		forward_axel = a
+		_position_wheel_trails()
+
+func _set_forward_axel_length(l : float) -> void:
+	if l > 0:
+		forward_axel_length = l
+		_position_wheel_trails()
 
 func _set_rear_axel(a : float) -> void:
 	if a > 0:
 		rear_axel = a
+		_position_wheel_trails()
+
+func _set_rear_axel_length(l : float) -> void:
+	if l > 0:
+		rear_axel_length = l
+		_position_wheel_trails()
 
 func _set_traction_slow_speed(s : float) -> void:
 	if s >= 0:
 
 func _ready():
 	camera.current = camera_enabled
+	_position_wheel_trails()
 	if Engine.editor_hint:
 		$Sprite.show_behind_parent = true
 		$Collision.visible = false
 func _draw():
 	if Engine.editor_hint:
 		var wheel_base_color = Color(1.0, 0.5, 0.0)
+		var wheel_axel_color = Color(0.0, 1.0, 0.0)
+		var wheel_color = Color(0.1, 0.1, 0.1)
 		draw_line(
 			Vector2(0, -forward_axel),
 			Vector2(0, rear_axel),
 			wheel_base_color,
 			2
 		)
+		draw_line(
+			Vector2(-forward_axel_length * 0.5, -forward_axel),
+			Vector2(forward_axel_length * 0.5, -forward_axel),
+			wheel_axel_color,
+			2
+		)
+		draw_line(
+			Vector2(-rear_axel_length * 0.5, rear_axel),
+			Vector2(rear_axel_length * 0.5, rear_axel),
+			wheel_axel_color,
+			2
+		)
+		draw_circle(Vector2(-forward_axel_length * 0.5, -forward_axel), 4, wheel_color)
+		draw_circle(Vector2(forward_axel_length * 0.5, -forward_axel), 4, wheel_color)
+		draw_circle(Vector2(-rear_axel_length * 0.5, rear_axel), 4, wheel_color)
+		draw_circle(Vector2(rear_axel_length * 0.5, rear_axel), 4, wheel_color)
 
 func _process(delta):
 	update()
 # Private "Helper" Methods
 # -----------------------------------------------------------------------------
 
+func _position_wheel_trails():
+	if trail_fd:
+		trail_fd.position = Vector2(-forward_axel_length * 0.5, -forward_axel)
+	if trail_fp:
+		trail_fp.position = Vector2(forward_axel_length * 0.5, -forward_axel)
+	if trail_rd:
+		trail_rd.position = Vector2(-rear_axel_length * 0.5, rear_axel)
+	if trail_rp:
+		trail_rp.position = Vector2(rear_axel_length * 0.5, rear_axel)
+
+
 func _generate_traction() -> float:
 	var traction = 1.0
 	var speed = velocity.length()

Objects/Vehicle/Vehicle.tscn

-[gd_scene load_steps=4 format=2]
+[gd_scene load_steps=6 format=2]
 
 [ext_resource path="res://Assets/Graphics/Car-Yellow.png" type="Texture" id=1]
 [ext_resource path="res://Objects/Vehicle/Vehicle.gd" type="Script" id=2]
+[ext_resource path="res://Objects/Trail/Trail.tscn" type="PackedScene" id=3]
+[ext_resource path="res://Objects/Vehicle/Tire_Curve_Basic.tres" type="Curve" id=4]
 
 [sub_resource type="CapsuleShape2D" id=1]
 radius = 14.0
 height = 32.0
 
 [node name="Vehicle" type="KinematicBody2D"]
+z_index = 1
 script = ExtResource( 2 )
 
 [node name="Collision" type="CollisionShape2D" parent="."]
+visible = false
 shape = SubResource( 1 )
 
 [node name="Sprite" type="Sprite" parent="."]
+show_behind_parent = true
 texture = ExtResource( 1 )
 
 [node name="Camera2D" type="Camera2D" parent="."]
 smoothing_enabled = true
+
+[node name="Trail_FD" parent="." instance=ExtResource( 3 )]
+position = Vector2( -5, -10 )
+width_curve = ExtResource( 4 )
+
+[node name="Trail_FP" parent="." instance=ExtResource( 3 )]
+position = Vector2( 5, -10 )
+width_curve = ExtResource( 4 )
+default_color = Color( 0.4, 0.831373, 1, 1 )
+
+[node name="Trail_RD" parent="." instance=ExtResource( 3 )]
+position = Vector2( -5, 10 )
+width_curve = ExtResource( 4 )
+default_color = Color( 1, 0.780392, 0.4, 1 )
+
+[node name="Trail_RP" parent="." instance=ExtResource( 3 )]
+position = Vector2( 5, 10 )
+width_curve = ExtResource( 4 )
+default_color = Color( 1, 0.552941, 0.4, 1 )

World.tscn

 [node name="Vehicle" parent="." instance=ExtResource( 1 )]
 position = Vector2( 946.288, 469.696 )
 camera_enabled = true
+forward_axel = 18.0
+forward_axel_length = 26.0
+rear_axel = 18.0
+rear_axel_length = 28.0
 
 [node name="PlayerCTRL" parent="Vehicle" instance=ExtResource( 2 )]