Initial commit.

.editorconfig

@@ -0,0 +1,4 @@
+root = true
+
+[*]
+charset = utf-8

.gitattributes

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+# Normalize EOL for all files that Git considers text files.
+* text=auto eol=lf

.gitignore

@@ -0,0 +1,3 @@
+# Godot 4+ specific ignores
+.godot/
+/android/

demo/airfoils/symmetric.tres

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+[gd_resource type="Resource" script_class="Airfoil" load_steps=5 format=3 uid="uid://dpk3bgq54ajul"]
+
+[ext_resource type="Script" uid="uid://jts0c0xrwc8q" path="res://scripts/aircraft/resources/airfoil.gd" id="1_bnq8l"]
+
+[sub_resource type="Curve" id="Curve_bnq8l"]
+_limits = [0.0, 0.25, -20.0, 20.0]
+_data = [Vector2(-20, 0.25), 0.0, -0.0451077, 0, 0, Vector2(-15.2, 0.106742), -0.0196947, -0.0196947, 0, 0, Vector2(-10.2128, 0.0337079), -0.00684561, -0.00684561, 0, 0, Vector2(0, 0.011236), 0.0, 0.0, 0, 0, Vector2(10, 0.0337079), 0.00560095, 0.00560095, 0, 0, Vector2(14.8936, 0.0983146), 0.0198034, 0.0198034, 0, 0, Vector2(20, 0.25), 0.0490369, 0.0, 0, 0]
+point_count = 7
+
+[sub_resource type="Curve" id="Curve_fbf5p"]
+_limits = [-1.5, 1.5, -20.0, 20.0]
+bake_resolution = 80
+_data = [Vector2(-13, -0.7), 0.0, 0.0, 0, 0, Vector2(-12, -1.1), 0.0, 0.0, 0, 0, Vector2(12, 1.1), 0.0, 0.0, 0, 0, Vector2(13, 0.7), 0.0, 0.0, 0, 0]
+point_count = 4
+
+[sub_resource type="Curve" id="Curve_iphra"]
+_limits = [0.0, 1.0, -20.0, 20.0]
+_data = [Vector2(-20, 0), 0.0, 0.0, 0, 0, Vector2(20, 0), 0.0, 0.0, 0, 0]
+point_count = 2
+
+[resource]
+script = ExtResource("1_bnq8l")
+lift_curve = SubResource("Curve_fbf5p")
+drag_curve = SubResource("Curve_bnq8l")
+moment_curve = SubResource("Curve_iphra")
+metadata/_custom_type_script = "uid://jts0c0xrwc8q"

demo/demo.tscn

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+[gd_scene load_steps=18 format=3 uid="uid://d20jwlre5rc5m"]
+
+[ext_resource type="Texture2D" uid="uid://bruwqvb6qrsfn" path="res://demo/textures/untexture.png" id="1_ytiva"]
+[ext_resource type="Script" uid="uid://bddnsq0h2tpf" path="res://scripts/aircraft/nodes/fixed_wing_aircraft.gd" id="2_dar0o"]
+[ext_resource type="Resource" uid="uid://dpk3bgq54ajul" path="res://demo/airfoils/symmetric.tres" id="3_u10mr"]
+[ext_resource type="Script" uid="uid://qjdma7j2qrns" path="res://scripts/aircraft/resources/fixed_wing_aircraft_performance.gd" id="4_onu7k"]
+[ext_resource type="Resource" uid="uid://p2i7a806s6gs" path="res://demo/propulsion/electric_motor.tres" id="4_s1s6j"]
+[ext_resource type="Script" uid="uid://pc3j1c6e1ra7" path="res://scripts/aircraft/nodes/flight_sim_controller.gd" id="5_s1s6j"]
+[ext_resource type="Script" uid="uid://tgj0rvn5wj8t" path="res://demo/hud.gd" id="6_onu7k"]
+
+[sub_resource type="StandardMaterial3D" id="StandardMaterial3D_j5lb4"]
+albedo_texture = ExtResource("1_ytiva")
+uv1_scale = Vector3(100, 100, 100)
+
+[sub_resource type="PlaneMesh" id="PlaneMesh_5hjng"]
+material = SubResource("StandardMaterial3D_j5lb4")
+size = Vector2(2000, 2000)
+
+[sub_resource type="Curve" id="Curve_s1s6j"]
+_limits = [0.0, 0.5, 0.0, 20.0]
+_data = [Vector2(0, 0.5), 0.0, 0.0, 0, 0, Vector2(20, 0), -0.082397, 0.0, 0, 0]
+point_count = 2
+
+[sub_resource type="Curve" id="Curve_onvmd"]
+_limits = [0.0, 2.0, 0.0, 30.0]
+_data = [Vector2(0, 2), 0.0, 0.0, 0, 0, Vector2(30, 0), -0.199316, 0.0, 0, 0]
+point_count = 2
+
+[sub_resource type="Curve" id="Curve_oeqrt"]
+_limits = [0.0, 0.202247, 0.0, 10.0]
+_data = [Vector2(0, 0.202247), 0.0, 0.0, 0, 0, Vector2(10, 0), -0.0393259, 0.0, 0, 0]
+point_count = 2
+
+[sub_resource type="Resource" id="Resource_onu7k"]
+script = ExtResource("4_onu7k")
+horizontal_surface = ExtResource("3_u10mr")
+horizontal_area = 21.8
+horizontal_aspect_ratio = 5.83
+horizontal_sweep = 0.0
+vertical_surface = ExtResource("3_u10mr")
+vertical_area = 5.0
+vertical_aspect_ratio = 5.0
+vertical_sweep = 0.0
+propultion = ExtResource("4_s1s6j")
+base_thrust = 100000.0
+base_drag = 0.0
+empty_mass = 3463.0
+yaw_axis = Vector3(0, -1, 0)
+roll_axis = Vector3(0, 0.1, -1)
+pitch_stability = 0.0
+yaw_stability = 0.0
+roll_stability = 0.0
+reference_ias_mps = 100.0
+braking_power = 0.0
+pitch_power = SubResource("Curve_s1s6j")
+yaw_power = SubResource("Curve_oeqrt")
+roll_power = SubResource("Curve_onvmd")
+metadata/_custom_type_script = "uid://qjdma7j2qrns"
+
+[sub_resource type="SphereShape3D" id="SphereShape3D_u10mr"]
+radius = 8.0
+
+[sub_resource type="ProceduralSkyMaterial" id="ProceduralSkyMaterial_onu7k"]
+
+[sub_resource type="Sky" id="Sky_s1s6j"]
+sky_material = SubResource("ProceduralSkyMaterial_onu7k")
+
+[sub_resource type="Environment" id="Environment_onvmd"]
+background_mode = 2
+sky = SubResource("Sky_s1s6j")
+ambient_light_source = 3
+ambient_light_color = Color(1, 1, 1, 1)
+
+[node name="Demo" type="Node3D"]
+
+[node name="Ground" type="MeshInstance3D" parent="."]
+mesh = SubResource("PlaneMesh_5hjng")
+
+[node name="FixedWingAircraft" type="CharacterBody3D" parent="." node_paths=PackedStringArray("controller")]
+transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 10, 0)
+script = ExtResource("2_dar0o")
+performance = SubResource("Resource_onu7k")
+controller = NodePath("FlightSimController")
+initial_speed = 100.0
+metadata/_custom_type_script = "uid://bddnsq0h2tpf"
+
+[node name="CollisionShape3D" type="CollisionShape3D" parent="FixedWingAircraft"]
+shape = SubResource("SphereShape3D_u10mr")
+
+[node name="FlightSimController" type="Node" parent="FixedWingAircraft"]
+script = ExtResource("5_s1s6j")
+pitch_speed = 4.0
+yaw_speed = 4.0
+roll_speed = 3.0
+metadata/_custom_type_script = "uid://pc3j1c6e1ra7"
+
+[node name="Camera3D" type="Camera3D" parent="FixedWingAircraft"]
+
+[node name="CanvasLayer" type="CanvasLayer" parent="."]
+
+[node name="HUD" type="Control" parent="CanvasLayer" node_paths=PackedStringArray("source")]
+layout_mode = 3
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+grow_horizontal = 2
+grow_vertical = 2
+script = ExtResource("6_onu7k")
+source = NodePath("../../FixedWingAircraft")
+
+[node name="TAS_Label" type="Label" parent="CanvasLayer/HUD"]
+layout_mode = 0
+offset_right = 40.0
+offset_bottom = 32.0
+
+[node name="AOA_Label" type="Label" parent="CanvasLayer/HUD"]
+layout_mode = 0
+offset_top = 32.0
+offset_right = 40.0
+offset_bottom = 64.0
+
+[node name="SideslipLabel" type="Label" parent="CanvasLayer/HUD"]
+layout_mode = 0
+offset_top = 64.0
+offset_right = 40.0
+offset_bottom = 96.0
+
+[node name="RelativeVelocityLabel" type="Label" parent="CanvasLayer/HUD"]
+layout_mode = 0
+offset_top = 96.0
+offset_right = 40.0
+offset_bottom = 128.0
+
+[node name="WorldEnvironment" type="WorldEnvironment" parent="."]
+environment = SubResource("Environment_onvmd")
+
+[node name="DirectionalLight3D" type="DirectionalLight3D" parent="."]
+transform = Transform3D(-4.37114e-08, -0.984808, 0.173648, 0, 0.173648, 0.984808, -1, 4.30473e-08, -7.5904e-09, 0, 0, 0)

demo/hud.gd

@@ -0,0 +1,15 @@
+class_name HUD
+extends Control
+
+@export var source: FixedWingAircraft
+
+@onready var tas_label := $TAS_Label as Label
+@onready var aoa_label := $AOA_Label as Label
+@onready var sideslip_label := $SideslipLabel as Label
+@onready var relative_velocity_label := $RelativeVelocityLabel as Label
+
+func _process(_delta: float) -> void:
+    tas_label.text = "TAS: %s" % source.m_tas
+    aoa_label.text = "AOA: %s" % rad_to_deg(source.m_aoa)
+    sideslip_label.text = "Sideslip: %s" % rad_to_deg(source.m_sideslip)
+    relative_velocity_label.text = "V: %s" % source.m_relative_velocity

demo/hud.gd.uid

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+uid://tgj0rvn5wj8t

demo/propulsion/electric_motor.tres

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+[gd_resource type="Resource" script_class="Propultion" load_steps=5 format=3 uid="uid://p2i7a806s6gs"]
+
+[ext_resource type="Script" uid="uid://8fsi1mq555uj" path="res://scripts/aircraft/resources/propultion.gd" id="1_idr77"]
+
+[sub_resource type="Curve" id="Curve_idr77"]
+_data = [Vector2(0, 0), 0.0, 2.81648, 0, 0, Vector2(1, 1), 0.0, 0.0, 0, 0]
+point_count = 2
+
+[sub_resource type="Curve" id="Curve_sw002"]
+_data = [Vector2(0, 1), 0.0, -2.57766, 0, 0, Vector2(1, 0), 0.0, 0.0, 0, 0]
+point_count = 2
+
+[sub_resource type="Curve" id="Curve_jnvlh"]
+_data = [Vector2(0, 1), 0.0, 0.0, 0, 0, Vector2(1, 1), 0.0, 0.0, 0, 0]
+point_count = 2
+
+[resource]
+script = ExtResource("1_idr77")
+propultion_speed_curve = SubResource("Curve_sw002")
+propultion_density_curve = SubResource("Curve_idr77")
+propultion_temperature_curve = SubResource("Curve_jnvlh")
+metadata/_custom_type_script = "uid://8fsi1mq555uj"

demo/textures/untexture.png.import

@@ -0,0 +1,35 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://bruwqvb6qrsfn"
+path.s3tc="res://.godot/imported/untexture.png-e9b4c6dd107bfceece0daf5f5dd4fe66.s3tc.ctex"
+metadata={
+"imported_formats": ["s3tc_bptc"],
+"vram_texture": true
+}
+
+[deps]
+
+source_file="res://demo/textures/untexture.png"
+dest_files=["res://.godot/imported/untexture.png-e9b4c6dd107bfceece0daf5f5dd4fe66.s3tc.ctex"]
+
+[params]
+
+compress/mode=2
+compress/high_quality=false
+compress/lossy_quality=0.7
+compress/hdr_compression=1
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=true
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=0

icon.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="128" height="128"><rect width="124" height="124" x="2" y="2" fill="#363d52" stroke="#212532" stroke-width="4" rx="14"/><g fill="#fff" transform="translate(12.322 12.322)scale(.101)"><path d="M105 673v33q407 354 814 0v-33z"/><path fill="#478cbf" d="m105 673 152 14q12 1 15 14l4 67 132 10 8-61q2-11 15-15h162q13 4 15 15l8 61 132-10 4-67q3-13 15-14l152-14V427q30-39 56-81-35-59-83-108-43 20-82 47-40-37-88-64 7-51 8-102-59-28-123-42-26 43-46 89-49-7-98 0-20-46-46-89-64 14-123 42 1 51 8 102-48 27-88 64-39-27-82-47-48 49-83 108 26 42 56 81zm0 33v39c0 276 813 276 814 0v-39l-134 12-5 69q-2 10-14 13l-162 11q-12 0-16-11l-10-65H446l-10 65q-4 11-16 11l-162-11q-12-3-14-13l-5-69z"/><path d="M483 600c0 34 58 34 58 0v-86c0-34-58-34-58 0z"/><circle cx="725" cy="526" r="90"/><circle cx="299" cy="526" r="90"/></g><g fill="#414042" transform="translate(12.322 12.322)scale(.101)"><circle cx="307" cy="532" r="60"/><circle cx="717" cy="532" r="60"/></g></svg>

icon.svg.import

@@ -0,0 +1,37 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://bw3c6f8nrg5q7"
+path="res://.godot/imported/icon.svg-218a8f2b3041327d8a5756f3a245f83b.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://icon.svg"
+dest_files=["res://.godot/imported/icon.svg-218a8f2b3041327d8a5756f3a245f83b.ctex"]
+
+[params]
+
+compress/mode=0
+compress/high_quality=false
+compress/lossy_quality=0.7
+compress/hdr_compression=1
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=false
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=1
+svg/scale=1.0
+editor/scale_with_editor_scale=false
+editor/convert_colors_with_editor_theme=false

project.godot

@@ -0,0 +1,80 @@
+; Engine configuration file.
+; It's best edited using the editor UI and not directly,
+; since the parameters that go here are not all obvious.
+;
+; Format:
+;   [section] ; section goes between []
+;   param=value ; assign values to parameters
+
+config_version=5
+
+[application]
+
+config/name="SparkyGD"
+run/main_scene="uid://d20jwlre5rc5m"
+config/features=PackedStringArray("4.4", "Forward Plus")
+config/icon="res://icon.svg"
+
+[autoload]
+
+Atmosphere="*res://scripts/aircraft/nodes/atmosphere.gd"
+
+[debug]
+
+gdscript/warnings/untyped_declaration=2
+gdscript/warnings/unsafe_property_access=2
+gdscript/warnings/unsafe_method_access=2
+gdscript/warnings/unsafe_cast=1
+gdscript/warnings/unsafe_call_argument=2
+gdscript/warnings/return_value_discarded=1
+
+[input]
+
+pitch_down={
+"deadzone": 0.2,
+"events": [Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":87,"key_label":0,"unicode":119,"location":0,"echo":false,"script":null)
+, Object(InputEventJoypadMotion,"resource_local_to_scene":false,"resource_name":"","device":-1,"axis":1,"axis_value":-1.0,"script":null)
+]
+}
+pitch_up={
+"deadzone": 0.2,
+"events": [Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":83,"key_label":0,"unicode":115,"location":0,"echo":false,"script":null)
+, Object(InputEventJoypadMotion,"resource_local_to_scene":false,"resource_name":"","device":-1,"axis":1,"axis_value":1.0,"script":null)
+]
+}
+yaw_left={
+"deadzone": 0.2,
+"events": [Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":81,"key_label":0,"unicode":113,"location":0,"echo":false,"script":null)
+, Object(InputEventJoypadMotion,"resource_local_to_scene":false,"resource_name":"","device":-1,"axis":4,"axis_value":1.0,"script":null)
+]
+}
+yaw_right={
+"deadzone": 0.2,
+"events": [Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":69,"key_label":0,"unicode":101,"location":0,"echo":false,"script":null)
+, Object(InputEventJoypadMotion,"resource_local_to_scene":false,"resource_name":"","device":-1,"axis":5,"axis_value":1.0,"script":null)
+]
+}
+roll_left={
+"deadzone": 0.2,
+"events": [Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":65,"key_label":0,"unicode":97,"location":0,"echo":false,"script":null)
+, Object(InputEventJoypadMotion,"resource_local_to_scene":false,"resource_name":"","device":-1,"axis":0,"axis_value":-1.0,"script":null)
+]
+}
+roll_right={
+"deadzone": 0.2,
+"events": [Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":68,"key_label":0,"unicode":100,"location":0,"echo":false,"script":null)
+, Object(InputEventJoypadMotion,"resource_local_to_scene":false,"resource_name":"","device":-1,"axis":0,"axis_value":1.0,"script":null)
+]
+}
+throttle_down={
+"deadzone": 0.2,
+"events": [Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":4194326,"key_label":0,"unicode":0,"location":0,"echo":false,"script":null)
+, Object(InputEventJoypadButton,"resource_local_to_scene":false,"resource_name":"","device":-1,"button_index":9,"pressure":0.0,"pressed":true,"script":null)
+]
+}
+throttle_up={
+"deadzone": 0.2,
+"events": [Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":4194325,"key_label":0,"unicode":0,"location":0,"echo":false,"script":null)
+, Object(InputEventJoypadButton,"resource_local_to_scene":false,"resource_name":"","device":-1,"button_index":10,"pressure":0.0,"pressed":true,"script":null)
+]
+}

scenes/aircraft/fixed_wing_aircraft.tscn

@@ -0,0 +1,6 @@
+[gd_scene load_steps=2 format=3 uid="uid://duwkogb01nnwa"]
+
+[ext_resource type="Script" uid="uid://bddnsq0h2tpf" path="res://scripts/aircraft/nodes/fixed_wing_aircraft.gd" id="1_6x31w"]
+
+[node name="FixedWingAircraft" type="CharacterBody3D"]
+script = ExtResource("1_6x31w")

scripts/aircraft/nodes/aircraft_controller.gd

@@ -0,0 +1,8 @@
+class_name AircraftController
+extends Node
+
+@export var pitch: float    # Negative: down, positive: up
+@export var yaw: float      # Negative: left, positive: right
+@export var roll: float     # Negative: left, positive: right
+@export var throttle: float # 0: minimum, 1: maximum
+@export var brake: float    # 0: fully released, 1: fully applied

scripts/aircraft/nodes/aircraft_controller.gd.uid

@@ -0,0 +1 @@
+uid://b2k35mmv3g82l

scripts/aircraft/nodes/atmosphere.gd

@@ -0,0 +1,55 @@
+extends Node
+
+@export var pressure_ASL := 101.325 # 1 atm. in kPa
+@export var density_ASL := 1.225 # at 288.15k in kg/m^3
+@export var temperature_ASL := 288.15 # surface temperature in Kelvin (288.15K = 15C)
+@export var tropopause_altitude := 11000.0 # meters above ASL
+@export var tropopause_temp := 216.65 # (216.65K = -56.5C)
+@export var gravity := 9.8 # here until I figure out the best way to get the project's default gravity.
+
+const AIR_MOLAR_MASS := 0.029 # kg/mol
+const GAS_CONSTANT := 8.31447
+const MACH_COEFF := 20.02948
+
+var pressure_constant: float
+var density_constant: float
+var temp_lapse_at_tropo: float # temperature lapse at troposphere, in K or C
+
+# Use this for initialization
+func _ready() -> void:
+    _recalculate()
+
+func _recalculate() -> void:
+    pressure_constant = (gravity * AIR_MOLAR_MASS) / (GAS_CONSTANT * temperature_ASL)
+    density_constant = 1 / density_ASL
+    temp_lapse_at_tropo = (temperature_ASL - tropopause_temp) / tropopause_altitude
+
+func pressure_by_alt(altitude: float, atm := false) -> float: # returns the pressure at altitude in kPa (default) or atm.
+    var ret := exp(pressure_constant * altitude)
+    if !atm:
+        ret *= pressure_ASL
+    return ret
+
+func density_by_alt(altitude: float, relative := false) -> float: # returns the density at altitude in kg/m^3 (default), or relative.
+    var ret := pressure_by_alt(altitude) / (0.287058 * temperature_by_alt(altitude))
+    if relative:
+        ret *= density_constant
+    return ret
+
+func temperature_by_alt(altitude: float) -> float:
+    if altitude < tropopause_altitude:
+        return temperature_ASL - altitude * temp_lapse_at_tropo
+    else: # mesopause coming soon!
+        return tropopause_temp
+
+func speed_of_sound_by_alt(altitude: float) -> float:
+    return sqrt(temperature_by_alt(altitude)) * MACH_COEFF
+
+func mach_by_alt(altitude: float, speed: float) -> float:# a little bit expensive - use with caution
+    return speed / speed_of_sound_by_alt(altitude)
+
+func atm_to_kPa(pressure: float) -> float:
+    return pressure * pressure_ASL
+
+func kPa_to_atm(pressure: float) -> float:
+    return pressure / pressure_ASL

scripts/aircraft/nodes/atmosphere.gd.uid

@@ -0,0 +1 @@
+uid://0nphoxplw624

scripts/aircraft/nodes/fixed_wing_aircraft.gd

@@ -0,0 +1,201 @@
+class_name FixedWingAircraft
+extends CharacterBody3D
+
+@export var performance: FixedWingAircraftPerformance
+@export var controller: AircraftController
+
+@export var initial_speed: float
+
+#var acceleration := Vector3
+#var angular_velocity := Vector3
+#var angular_acceleration := Vector3
+var m_aoa: float
+var m_sideslip: float
+var m_tas: float
+var m_ias: float
+var m_relative_velocity: Vector3
+
+var m_is_landed := false
+
+func _ready() -> void:
+    velocity = -global_basis.z * initial_speed
+    m_relative_velocity = transform.basis.inverse() * velocity
+    m_tas = _tas()
+    m_ias = _ias()
+
+func _physics_process(delta: float) -> void:
+        
+    m_relative_velocity = transform.basis.inverse() * velocity
+    m_aoa = -atan2(m_relative_velocity.y, -m_relative_velocity.z)
+    if m_aoa > PI:
+        m_aoa -= TAU
+    m_sideslip = -atan2(m_relative_velocity.x, -m_relative_velocity.z)
+    if m_sideslip > PI:
+        m_sideslip -= TAU
+    m_tas = _tas()
+    m_ias = _ias()
+    
+    # aero
+    var vel_forward := m_relative_velocity.normalized()
+    var vel_right := vel_forward.cross(Vector3.UP).normalized()
+    var vel_up := vel_right.cross(vel_forward).normalized()
+    #var vel_basis := Basis(vel_right, vel_up, vel_forward)
+    var linear_forces := Vector3.ZERO
+    
+    var horiz_lift := _lift(performance.horizontal_surface,
+                            performance.horizontal_area,
+                            performance.horizontal_aspect_ratio,
+                            performance.horizontal_sweep,
+                            m_aoa, m_tas)
+    var horiz_drag := _drag(performance.horizontal_surface,
+                            performance.horizontal_area,
+                            performance.horizontal_aspect_ratio,
+                            performance.horizontal_sweep,
+                            m_aoa, m_tas)
+    var vert_lift := _lift(performance.vertical_surface,
+                           performance.vertical_area,
+                           performance.vertical_aspect_ratio,
+                           performance.vertical_sweep,
+                           m_sideslip, m_tas)
+    var vert_drag := _drag(performance.vertical_surface,
+                           performance.vertical_area,
+                           performance.vertical_aspect_ratio,
+                           performance.vertical_sweep,
+                           m_sideslip, m_tas)
+    
+    linear_forces += vel_up * horiz_lift
+    linear_forces += vel_right * vert_lift
+    linear_forces -= vel_forward * horiz_drag
+    linear_forces -= vel_forward * vert_drag
+    linear_forces += Vector3.FORWARD * _thrust()
+    m_relative_velocity += linear_forces * delta / performance.empty_mass
+    velocity = (transform.basis * m_relative_velocity) + (get_gravity() * delta)
+    
+    # steering
+    var steering_axis := _get_steering_axis() * delta
+    if (steering_axis.length_squared() > 0.0):
+        rotate_object_local(steering_axis.normalized(), steering_axis.length())
+    
+    move_and_slide()
+    #if !is_landed:
+    #    _fly()
+    #else:
+    #    taxi()
+    #ResetControls()
+
+#func _sync()
+
+func _get_steering_axis() -> Vector3:
+    var pitch_effect := Vector3.RIGHT * performance.pitch_power.sample(absf(rad_to_deg(m_aoa))) * controller.pitch
+    var yaw_effect := performance.yaw_axis.normalized() * performance.yaw_power.sample(absf(rad_to_deg(m_sideslip))) * controller.yaw
+    var roll_effect := performance.roll_axis.normalized() * performance.roll_power.sample(absf(rad_to_deg(m_aoa))) * controller.roll
+    return (pitch_effect + yaw_effect + roll_effect) * m_ias / performance.reference_ias_mps
+    
+func _lift(foil: Airfoil,
+           area: float,
+           aspect_ratio: float,
+           _sweep: float,
+           aoa: float,
+           tas: float) -> float:
+    # https://www1.grc.nasa.gov/beginners-guide-to-aeronautics/downwash-effects-on-lift/
+    var Cl0: float
+    if absf(aoa) < PI / 9:
+        Cl0 = foil.lift_curve.sample(rad_to_deg(aoa))
+    else:
+        Cl0 = sin(aoa * 2.0) * 2.0
+    var Cl := Cl0 / (1.0 + Cl0 / (PI * aspect_ratio))
+    return Cl * area * tas * tas * Atmosphere.density_by_alt(position.y) * 0.5
+
+func _drag(foil: Airfoil,
+           area: float,
+           _aspect_ratio: float,
+           _sweep: float,
+           aoa: float,
+           tas: float) -> float:
+    var Dl0: float
+    if absf(aoa) < PI / 9:
+        Dl0 = foil.drag_curve.sample(rad_to_deg(aoa))
+    else:
+        Dl0 = sin(aoa) * sin(aoa) * 10.0
+    #var Dl := Dl0 / (1.0 + Dl0 / (PI * aspect_ratio))
+    return Dl0 * area * tas * tas * Atmosphere.density_by_alt(position.y) * 0.5
+
+func _moment(foil: Airfoil,
+             area: float,
+             aspect_ratio: float,
+             _sweep: float,
+             aoa: float,
+             tas: float) -> float:
+    var Ml0 := foil.lift_curve.sample(rad_to_deg(aoa))
+    #var Ml := Ml0 / (1.0 + Ml0 / (PI * aspect_ratio))
+    var mean_chord := sqrt(area / aspect_ratio)
+    return Ml0 * area * tas * tas * Atmosphere.density_by_alt(position.y) * 0.5 * mean_chord
+
+func _thrust() -> float:
+    var speed_contrib := performance.propultion.propultion_speed_curve.sample(Atmosphere.mach_by_alt(position.y, m_tas))
+    var density_contrib := performance.propultion.propultion_density_curve.sample(Atmosphere.density_by_alt(position.y, true))
+    var temp_contrib := performance.propultion.propultion_temperature_curve.sample(Atmosphere.temperature_by_alt(position.y))
+    return speed_contrib * density_contrib * temp_contrib * performance.base_thrust * controller.throttle
+
+#func _fly() -> void:
+    #acceleration = Vector3.DOWN * global_basis * gravity
+    #if controller.brake > 0.0:
+    #    mThrust -= performance.braking_power * _ias()
+    #acceleration += Vector3.FORWARD * mThrust / mass;
+    #lift();
+    #control();
+    #velocity += mAcceleration * Time.fixedDeltaTime;
+    #transform.Translate(velocity * Time.fixedDeltaTime * iScale);
+    #Vector3 prevVel = transform.TransformDirection(velocity);
+    #transform.Rotate(mAngularVelocity * Time.fixedDeltaTime);
+    #velocity = transform.InverseTransformDirection(prevVel);
+    # Check to see if we've landed
+    #if (isLandingGearDeployed)
+    #{
+    #    RaycastHit ground;
+    #    Physics.Raycast(transform.position, -transform.up, out ground, rideHeight, 0xFF, QueryTriggerInteraction.Ignore);
+    #    if (ground.collider != null && ground.distance < rideHeight)
+    #    {
+    #        AttemptLanding(ref ground);
+    #    }
+    #}
+
+#func lift() -> void:
+#    var speed_sqr_YZ := velocity.y * velocity.y + velocity.z * velocity.z
+#    var speed_sqr_XZ := velocity.x * velocity.x + velocity.z * velocity.z
+#    var altitude := Atmosphere.altitude(position.y)
+#    float horizLiftPerCoeff = speed_sqr_YZ * horizWingArea * Atmosphere.Density(altitude, true) * 0.5f / mass;
+#    float vertLiftPerCoeff = speed_sqr_XZ * vertWingArea * Atmosphere.Density(altitude, true) * 0.5f / mass;
+#    float degAoA = AoA * Mathf.Rad2Deg;
+#    float degSideslip = sideslip * Mathf.Rad2Deg;
+#    float wingDrag = horizAirfoil.getDrag(degAoA) * horizWingArea + vertAirfoil.getDrag(degSideslip) * vertWingArea;
+#    float mach = Atmosphere.Mach(altitude, velocity.magnitude);
+#    if (mach > 0.7f) # No need to do expensive calculations unless we're going fast enough for them to matter.
+#    {
+#        wingDrag += 3 * wingDrag * Mathf.Min(Mathf.Exp(16 * (mach - 1.0f + Mathf.Log10(1 - wingSweep / 90.0f))), Mathf.Exp(-mach + 1.0f));
+#    }
+#    float totalDrag = indicatedVelocity.sqrMagnitude * Atmosphere.Density(altitude, true) * 0.5f * (wingDrag + bodyDragCoeff * frontalArea) / mass;
+#    Vector3 relativeAccel = new Vector3(-vertAirfoil.getLift(degSideslip) * vertLiftPerCoeff, horizAirfoil.getLift(degAoA) * horizLiftPerCoeff, -totalDrag);
+#    Vector3 fixedAcceleration = TransformR(relativeAccel);
+#    if ((velocity.x + mAcceleration.x * Time.fixedDeltaTime) * velocity.x < 0.0f)
+#    {
+#        fixedAcceleration.x = -velocity.x / Time.fixedDeltaTime;
+#    }
+#    if ((velocity.y + mAcceleration.y * Time.fixedDeltaTime) * velocity.y < 0.0f)
+#    {
+#        fixedAcceleration.y = -velocity.y / Time.fixedDeltaTime;
+#    }
+#    acceleration += fixedAcceleration;
+#    mAngularVelocity = new Vector3(horizAirfoil.getMoment(degAoA) * horizLiftPerCoeff, vertAirfoil.getMoment(degSideslip) * vertLiftPerCoeff, 0f);
+#    mAngularVelocity += new Vector3(-moment * Mathf.Cos(Vector3.Angle(Physics.gravity, transform.up) * Mathf.Deg2Rad) * horizLiftPerCoeff, 0.0f, 0.0f)
+
+func _tas() -> float:
+    return sqrt(m_relative_velocity.z * m_relative_velocity.z + m_relative_velocity.y * m_relative_velocity.y) * -sign(m_relative_velocity.z)
+    
+func _ias() -> float:
+    return _tas() * sqrt(Atmosphere.density_by_alt(position.y, true))
+
+#func _
+    
+#func _g_force() -> Vector3:
+#    return (acceleration - transform.inverse(get_gravity())) / get_gravity().length()

scripts/aircraft/nodes/fixed_wing_aircraft.gd.uid

@@ -0,0 +1 @@
+uid://bddnsq0h2tpf

scripts/aircraft/nodes/flight_sim_controller.gd

@@ -0,0 +1,37 @@
+class_name FlightSimController
+extends AircraftController
+
+@export var pitch_down := &"pitch_down"
+@export var pitch_up := &"pitch_up"
+@export var yaw_left := &"yaw_left"
+@export var yaw_right := &"yaw_right"
+@export var roll_left := &"roll_left"
+@export var roll_right := &"roll_right"
+@export var throttle_down := &"throttle_down"
+@export var throttle_up := &"throttle_up"
+
+@export var pitch_speed := 1.0
+@export var yaw_speed := 1.0
+@export var roll_speed := 1.0
+@export var throttle_speed := 1.0
+
+func _physics_process(delta: float) -> void:
+    if get_multiplayer_authority() == multiplayer.get_unique_id():
+        var pitch_target := Input.get_axis(pitch_down, pitch_up)
+        var pitch_diff := pitch_target - pitch
+        pitch += signf(pitch_diff) * minf(absf(pitch_diff), pitch_speed * delta)
+        
+        var yaw_target := Input.get_axis(yaw_left, yaw_right)
+        var yaw_diff := yaw_target - yaw
+        yaw += signf(yaw_diff) * minf(absf(yaw_diff), yaw_speed * delta)
+        
+        var roll_target := Input.get_axis(roll_left, roll_right)
+        var roll_diff := roll_target - roll
+        roll += signf(roll_diff) * minf(absf(roll_diff), roll_speed * delta)
+        
+        var throttle_target := Input.get_axis(throttle_down, throttle_up) * 0.5 + 0.5
+        if throttle_target > throttle:
+            throttle = minf(throttle_target, throttle + throttle_speed * delta)
+        elif throttle_target < throttle:
+            throttle = maxf(throttle_target, throttle - throttle_speed * delta)
+        brake = 1.0 if throttle < 0.05 else 0.0

scripts/aircraft/nodes/flight_sim_controller.gd.uid

@@ -0,0 +1 @@
+uid://pc3j1c6e1ra7

scripts/aircraft/resources/airfoil.gd

@@ -0,0 +1,6 @@
+class_name Airfoil
+extends Resource
+
+@export var lift_curve: Curve
+@export var drag_curve: Curve
+@export var moment_curve: Curve

scripts/aircraft/resources/airfoil.gd.uid

@@ -0,0 +1 @@
+uid://jts0c0xrwc8q

scripts/aircraft/resources/fixed_wing_aircraft_performance.gd

@@ -0,0 +1,27 @@
+class_name FixedWingAircraftPerformance
+extends Resource
+
+@export var horizontal_surface: Airfoil
+@export var horizontal_area: float
+@export var horizontal_aspect_ratio: float
+@export var horizontal_sweep: float
+@export var vertical_surface: Airfoil
+@export var vertical_area: float
+@export var vertical_aspect_ratio: float
+@export var vertical_sweep: float
+@export var propultion: Propultion
+@export var base_thrust: float
+@export var base_drag: float
+@export var empty_mass: float
+@export var yaw_axis: Vector3 = Vector3.DOWN
+@export var roll_axis: Vector3 = Vector3.FORWARD
+@export var pitch_stability: float
+@export var yaw_stability: float
+@export var roll_stability: float
+
+# Below are factors designed around the reference IAS.
+@export var reference_ias_mps: float = 100.0
+@export var braking_power: float
+@export var pitch_power: Curve
+@export var yaw_power: Curve
+@export var roll_power: Curve

scripts/aircraft/resources/fixed_wing_aircraft_performance.gd.uid

@@ -0,0 +1 @@
+uid://qjdma7j2qrns

scripts/aircraft/resources/propultion.gd

@@ -0,0 +1,6 @@
+class_name Propultion
+extends Resource
+
+@export var propultion_speed_curve: Curve
+@export var propultion_density_curve: Curve
+@export var propultion_temperature_curve: Curve

scripts/aircraft/resources/propultion.gd.uid

@@ -0,0 +1 @@
+uid://8fsi1mq555uj