Add gears, clutch and some kind of RPM calculation

project.godot

@@ -13,6 +13,63 @@ config_version=4
 config/name="bugged-racing"
 config/icon="res://icon.png"
 
+[input]
+
+throttle={
+"deadzone": 0.5,
+"events": [ Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":0,"alt":false,"shift":false,"control":false,"meta":false,"command":false,"pressed":false,"scancode":87,"physical_scancode":0,"unicode":0,"echo":false,"script":null)
+, Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":0,"alt":false,"shift":false,"control":false,"meta":false,"command":false,"pressed":false,"scancode":16777232,"physical_scancode":0,"unicode":0,"echo":false,"script":null)
+, Object(InputEventJoypadMotion,"resource_local_to_scene":false,"resource_name":"","device":0,"axis":7,"axis_value":1.0,"script":null)
+ ]
+}
+brake={
+"deadzone": 0.5,
+"events": [ Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":0,"alt":false,"shift":false,"control":false,"meta":false,"command":false,"pressed":false,"scancode":83,"physical_scancode":0,"unicode":0,"echo":false,"script":null)
+, Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":0,"alt":false,"shift":false,"control":false,"meta":false,"command":false,"pressed":false,"scancode":16777234,"physical_scancode":0,"unicode":0,"echo":false,"script":null)
+, Object(InputEventJoypadMotion,"resource_local_to_scene":false,"resource_name":"","device":0,"axis":6,"axis_value":1.0,"script":null)
+ ]
+}
+clutch={
+"deadzone": 0.5,
+"events": [ Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":0,"alt":false,"shift":false,"control":false,"meta":false,"command":false,"pressed":false,"scancode":67,"physical_scancode":0,"unicode":0,"echo":false,"script":null)
+, Object(InputEventJoypadMotion,"resource_local_to_scene":false,"resource_name":"","device":0,"axis":3,"axis_value":-1.0,"script":null)
+ ]
+}
+handbrake={
+"deadzone": 0.5,
+"events": [ Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":0,"alt":false,"shift":false,"control":false,"meta":false,"command":false,"pressed":false,"scancode":32,"physical_scancode":0,"unicode":0,"echo":false,"script":null)
+, Object(InputEventJoypadMotion,"resource_local_to_scene":false,"resource_name":"","device":0,"axis":3,"axis_value":1.0,"script":null)
+ ]
+}
+steer_left={
+"deadzone": 0.5,
+"events": [ Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":0,"alt":false,"shift":false,"control":false,"meta":false,"command":false,"pressed":false,"scancode":65,"physical_scancode":0,"unicode":0,"echo":false,"script":null)
+, Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":0,"alt":false,"shift":false,"control":false,"meta":false,"command":false,"pressed":false,"scancode":16777231,"physical_scancode":0,"unicode":0,"echo":false,"script":null)
+, Object(InputEventJoypadMotion,"resource_local_to_scene":false,"resource_name":"","device":0,"axis":0,"axis_value":-1.0,"script":null)
+ ]
+}
+steer_right={
+"deadzone": 0.5,
+"events": [ Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":0,"alt":false,"shift":false,"control":false,"meta":false,"command":false,"pressed":false,"scancode":68,"physical_scancode":0,"unicode":0,"echo":false,"script":null)
+, Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":0,"alt":false,"shift":false,"control":false,"meta":false,"command":false,"pressed":false,"scancode":16777233,"physical_scancode":0,"unicode":0,"echo":false,"script":null)
+, Object(InputEventJoypadMotion,"resource_local_to_scene":false,"resource_name":"","device":0,"axis":0,"axis_value":1.0,"script":null)
+ ]
+}
+gear_up={
+"deadzone": 0.5,
+"events": [ Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":0,"alt":false,"shift":false,"control":false,"meta":false,"command":false,"pressed":false,"scancode":16777237,"physical_scancode":0,"unicode":0,"echo":false,"script":null)
+, Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":0,"alt":false,"shift":false,"control":false,"meta":false,"command":false,"pressed":false,"scancode":69,"physical_scancode":0,"unicode":0,"echo":false,"script":null)
+, Object(InputEventJoypadButton,"resource_local_to_scene":false,"resource_name":"","device":0,"button_index":5,"pressure":0.0,"pressed":false,"script":null)
+ ]
+}
+gear_down={
+"deadzone": 0.5,
+"events": [ Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":0,"alt":false,"shift":false,"control":false,"meta":false,"command":false,"pressed":false,"scancode":16777238,"physical_scancode":0,"unicode":0,"echo":false,"script":null)
+, Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":0,"alt":false,"shift":false,"control":false,"meta":false,"command":false,"pressed":false,"scancode":81,"physical_scancode":0,"unicode":0,"echo":false,"script":null)
+, Object(InputEventJoypadButton,"resource_local_to_scene":false,"resource_name":"","device":0,"button_index":4,"pressure":0.0,"pressed":false,"script":null)
+ ]
+}
+
 [physics]
 
 common/enable_pause_aware_picking=true

scenes/test_level.tscn

@@ -35,7 +35,6 @@ shape = SubResource( 3 )
 [node name="buggy" parent="." instance=ExtResource( 1 )]
 transform = Transform( 1.00456, 0, 0, 0, 1.00456, 0, 0, 0, 1.00456, -38.0928, 1.38435, -0.0872202 )
 mass = 250.0
-engine_force_value = 10000
 
 [node name="camera" type="Camera" parent="."]
 transform = Transform( 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 5.88022, 23.0639 )

vehicles/buggy.gd

@@ -5,35 +5,108 @@ const STEER_LIMIT = 0.4
 
 var steer_target = 0
 
-export var engine_force_value = 40
+export (float) var MAX_ENGINE_FORCE = 100.0
+export (float) var MAX_BRAKE_FORCE = 50.0
+export (float) var THROTTLE_POWER = 10000.0
+export (float) var MAX_RPM_LOSS_PS = 3000.0
 
-func _physics_process(delta):
+export (Array) var gear_ratios = [ 6, 5, 4, 3, 2, 1.0 ]
-	var fwd_mps = transform.basis.xform_inv(linear_velocity).x
+export (float) var reverse_ratio = -6.0
+export (float) var final_drive = 3.38
+export (float) var max_rpm = 7000
+export (float) var min_rpm = 900
+export (float) var gear_switch_time = 0.2
+export (Curve) var power_curve
 
-	steer_target = Input.get_action_strength("ui_left") - Input.get_action_strength("ui_right")
+var clutch_position: float = 0.0
+var rpm = 0
+var gear = 1
+
+var gear_timer = 0
+
+onready var frwheel: VehicleWheel = $front_right
+onready var flwheel: VehicleWheel = $front_left
+onready var rrwheel: VehicleWheel = $rear_right
+onready var rlwheel: VehicleWheel = $rear_left
+
+var traction_wheels: Array
+
+func _ready():
+	for wheel in [frwheel, flwheel, rrwheel, rlwheel]:
+		if wheel.use_as_traction:
+			traction_wheels.append(wheel)
+
+func _get_gear_ratio():
+	if gear == 0:
+		return 0
+	elif gear == -1:
+		return reverse_ratio
+	else:
+		return gear_ratios[gear - 1]
+
+func _handle_gear_switch(delta: float):
+	if gear_timer > 0:
+		gear_timer = max(0, gear_timer - delta)
+	elif clutch_position > 0.8:
+		if Input.is_action_just_pressed("gear_up"):
+			if gear + 1 <= gear_ratios.size():
+				gear += 1
+				gear_timer = gear_switch_time * (2 - clutch_position)
+		if Input.is_action_just_pressed("gear_down"):
+			if gear - 1 >= -1:
+				gear -= 1
+				gear_timer = gear_switch_time * (2 - clutch_position)
+
+func _has_traction():
+	for wheel in traction_wheels:
+		if wheel.is_in_contact():
+			return true
+	return false
+
+func _lerp_rpm(from, to, delta, factor):
+	var new_val = lerp(from, to, factor)
+	if abs(from - new_val) > MAX_RPM_LOSS_PS * delta:
+		var new_factor = inverse_lerp(from, to, from - sign(from - new_val) * MAX_RPM_LOSS_PS * delta)
+		new_val = lerp(from, to, new_factor)
+	return new_val
+
+func _physics_process(delta: float):
+	clutch_position = Input.get_action_strength("clutch")
+	_handle_gear_switch(delta)
+	var throttle = Input.get_action_strength("throttle")
+
+	var wheel_rpm = traction_wheels[0].get_rpm()
+	var final_rpm = abs(wheel_rpm) * final_drive
+	var transmission_rpm = final_rpm * abs(_get_gear_ratio())
+
+	if gear != 0:
+		rpm = lerp(rpm, transmission_rpm, delta * (1 - clutch_position))
+		rpm = _lerp_rpm(rpm, min_rpm, delta, delta * clutch_position * 3)
+	else:
+		rpm = _lerp_rpm(rpm, min_rpm, delta, delta * 3)
+	if _has_traction():
+		rpm += throttle * delta * clutch_position * THROTTLE_POWER
+	else:
+		rpm += throttle * delta * THROTTLE_POWER
+	rpm = clamp(rpm, 0, max_rpm)
+	var rpm_factor = clamp(rpm / max_rpm, 0.0, 1.0)
+	var power_factor = power_curve.interpolate_baked(rpm_factor)
+
+	# Transfer to transmission
+	var transmission_input = power_factor * (1 - clutch_position) * _get_gear_ratio()
+
+	var final_input = transmission_input * final_drive
+
+	brake = Input.get_action_strength("brake") * MAX_BRAKE_FORCE
+	engine_force = throttle * final_input * MAX_ENGINE_FORCE
+
+	var handbrake = Input.get_action_strength("handbrake")
+	rrwheel.brake = handbrake * MAX_BRAKE_FORCE / 2
+	rlwheel.brake = handbrake * MAX_BRAKE_FORCE / 2
+
+	$Info.text = "Gear: %d, RPM: %.0f, TRPM: %.0f, Engine force: %.0f" % [ gear, rpm, transmission_rpm, engine_force ]
+
+	steer_target = Input.get_action_strength("steer_left") - Input.get_action_strength("steer_right")
 	steer_target *= STEER_LIMIT
 
-	if Input.is_action_pressed("ui_up"):
-		# Increase engine force at low speeds to make the initial acceleration faster.
-		var speed = linear_velocity.length()
-		if speed < 5 and speed != 0:
-			engine_force = clamp(engine_force_value * 5 / speed, 0, 100)
-		else:
-			engine_force = engine_force_value
-	else:
-		engine_force = 0
-
-	if Input.is_action_pressed("ui_down"):
-		# Increase engine force at low speeds to make the initial acceleration faster.
-		if fwd_mps >= -1:
-			var speed = linear_velocity.length()
-			if speed < 5 and speed != 0:
-				engine_force = -clamp(engine_force_value * 5 / speed, 0, 100)
-			else:
-				engine_force = -engine_force_value
-		else:
-			brake = 1
-	else:
-		brake = 0.0
-
 	steering = move_toward(steering, steer_target, STEER_SPEED * delta)

vehicles/buggy.tscn

@@ -1,13 +1,17 @@
-[gd_scene load_steps=4 format=2]
+[gd_scene load_steps=5 format=2]
 
 [ext_resource path="res://assets/basic_buggy.glb" type="PackedScene" id=1]
 [ext_resource path="res://vehicles/buggy.gd" type="Script" id=3]
 
+[sub_resource type="Curve" id=2]
+_data = [ Vector2( 0, 0 ), 0.0, 0.0, 0, 0, Vector2( 0.910377, 0.990909 ), 0.0, 0.0, 0, 0, Vector2( 1, 0 ), 0.0, 0.0, 0, 0 ]
+
 [sub_resource type="BoxShape" id=1]
 extents = Vector3( 0.521885, 0.334919, 1.78849 )
 
 [node name="buggy" instance=ExtResource( 1 )]
 script = ExtResource( 3 )
+power_curve = SubResource( 2 )
 
 [node name="chassis" parent="." index="0"]
 transform = Transform( -1, 0, -3.25841e-07, 0, 1, 0, 3.25841e-07, 0, -1, 0, 0.446435, 0 )
@@ -45,3 +49,10 @@ wheel_radius = 0.6
 wheel_rest_length = 0.4
 suspension_travel = 1.0
 suspension_max_force = 10000.0
+
+[node name="Info" type="Label" parent="." index="7"]
+margin_right = 40.0
+margin_bottom = 14.0
+__meta__ = {
+"_edit_use_anchors_": false
+}