Add 'modules/behaviour_nodes/' from commit '2a4e00e6f1'

git-subtree-dir: modules/behaviour_nodes
git-subtree-mainline: 4e641855b4
git-subtree-split: 2a4e00e6f1

.dir-locals.el

@@ -0,0 +1,6 @@
+((c++-mode . ((mode . clang-format-on-save)))
+ (c-mode . ((mode . c++)))
+ (nil . ((projectile-project-compilation-cmd . "just build")
+         (projectile-project-run-cmd . "engine/bin/godot.linuxbsd.editor.dev.x86_64.llvm --path project")
+         (projectile-project-configure-cmd . "engine/bin/godot.linuxbsd.editor.dev.x86_64.llvm --path project -e")
+         (projectile-project-test-cmd . "engine/bin/godot.linuxbsd.editor.dev.x86.llvm --path project"))))

.gitignore

@@ -6,9 +6,17 @@
 config.log
 .sconf_temp
 
+# build artifacts
+*.o
+compile_commands.json
 engine/.github
 project/.godot
-build/PROJECT.pck
-build/PROJECT.x86_64
-build/PROJECT.exe
+build/authority.pck
+build/authority.x86_64
+build/authority.exe
 build.zip
+
+# general-purpose cache folder (used by e.g clangd)
+.cache
+
+__pycache__

engine

@@ -1 +1 @@
-Subproject commit 215acd52e82f4c575abb715e25e54558deeef998
+Subproject commit 6b76a5a8dc011723033cc8ad2ba3da345daab039

justfile

@@ -1,6 +1,6 @@
 set export
 
-BUILD_NAME := "change_me"
+BUILD_NAME := "authority"
 
 build: format
     # Compiling Editor
@@ -37,9 +37,8 @@ release-windows: build
 initialize-template projectname:
     # Initializing Template {{projectname}}
     sed -i -e "s/PROJECT/{{projectname}}/g" ./modules/PROJECT/register_types.h ./modules/PROJECT/register_types.cpp ./project/project.godot ./project/export_presets.cfg .gitignore
-    sed "s/change_me/{{projectname}}/" ./justfile
+    sed -i -e "s/authority/{{projectname}}/" ./justfile
     mv ./modules/PROJECT ./modules/{{projectname}}
-    # Done Initializing, you will still have to update BUILD_NAME in your justfile
 
 format:
     # Formatting Custom Modules

modules/PROJECT/macros.h

@@ -1,20 +0,0 @@
-#ifndef GODOT_EXTRA_MACROS_H
-#define GODOT_EXTRA_MACROS_H
-
-#define BIND_GET_SET(m_property)                                    \
-	ClassDB::bind_method(D_METHOD("set_" #m_property, #m_property), \
-			&self_type::set_##m_property);                          \
-	ClassDB::bind_method(D_METHOD("get_" #m_property),              \
-			&self_type::get_##m_property)
-
-#define BIND_HPROPERTY(m_type, m_property, ...)                  \
-	BIND_GET_SET(m_property);                                    \
-	ADD_PROPERTY(PropertyInfo(m_type, #m_property, __VA_ARGS__), \
-			"set_" #m_property, "get_" #m_property)
-
-#define BIND_PROPERTY(m_type, m_property)                               \
-	BIND_GET_SET(m_property);                                           \
-	ADD_PROPERTY(PropertyInfo(m_type, #m_property), "set_" #m_property, \
-			"get_" #m_property)
-
-#endif // !GODOT_EXTRA_MACROS_H

modules/PROJECT/register_types.cpp

@@ -1,15 +0,0 @@
-#include "register_types.h"
-
-#include "core/object/class_db.h"
-
-void initialize_PROJECT_module(ModuleInitializationLevel p_level) {
-	if (p_level != MODULE_INITIALIZATION_LEVEL_SCENE) {
-		return;
-	}
-}
-
-void uninitialize_PROJECT_module(ModuleInitializationLevel p_level) {
-	if (p_level != MODULE_INITIALIZATION_LEVEL_SCENE) {
-		return;
-	}
-}

modules/PROJECT/register_types.h

@@ -1,9 +0,0 @@
-#ifndef PROJECT_REGISTER_TYPES_H
-#define PROJECT_REGISTER_TYPES_H
-
-#include "modules/register_module_types.h"
-
-void initialize_PROJECT_module(ModuleInitializationLevel p_level);
-void uninitialize_PROJECT_module(ModuleInitializationLevel p_level);
-
-#endif // !PROJECT_REGISTER_TYPES_H

modules/authority/character.cpp

@@ -0,0 +1,155 @@
+#include "character.h"
+#include "core/config/engine.h"
+#include "macros.h"
+
+void CharacterData::_bind_methods() {
+	BIND_PROPERTY(Variant::FLOAT, speed);
+}
+
+void Character::_bind_methods() {
+	BIND_HPROPERTY(Variant::OBJECT, data, PROPERTY_HINT_RESOURCE_TYPE, "CharacterData");
+}
+
+void Character::physics_process(double delta) {
+	Vector3 const velocity{ get_velocity() };
+	Vector3 new_velocity{ velocity };
+	new_velocity.x = this->world_movement_direction.x;
+	new_velocity.z = this->world_movement_direction.y;
+	set_velocity(new_velocity);
+	if (!velocity.is_zero_approx()) {
+		move_and_slide();
+	}
+}
+
+void Character::_notification(int what) {
+	if (Engine::get_singleton()->is_editor_hint() || !this->data.is_valid()) {
+		return;
+	}
+	switch (what) {
+		default:
+			return;
+		case NOTIFICATION_READY:
+			set_physics_process(true);
+			return;
+		case NOTIFICATION_PHYSICS_PROCESS:
+			physics_process(get_physics_process_delta_time());
+			return;
+	}
+}
+
+PackedStringArray Character::get_configuration_warnings() const {
+	PackedStringArray warnings{ super_type::get_configuration_warnings() };
+	if (this->data.is_null()) {
+		warnings.push_back("Character requires 'data' to be initialised. To avoid crashes consider adding a placeholder if you intend to programmatically initialise it.");
+	}
+	return warnings;
+}
+
+void Character::set_movement(Vector2 movement) {
+	this->world_movement_direction = movement;
+}
+
+bool Character::is_moving() const {
+	return !this->world_movement_direction.is_zero_approx();
+}
+
+void CharacterState::_bind_methods() {
+	BIND_PROPERTY(Variant::BOOL, start_active);
+}
+
+void CharacterState::_notification(int what) {
+	if (Engine::get_singleton()->is_editor_hint()) {
+		return;
+	}
+	switch (what) {
+		default:
+			return;
+		case NOTIFICATION_ENTER_TREE:
+			this->character = cast_to<Character>(get_parent());
+			ERR_FAIL_COND_EDMSG(this->character == nullptr, "CharacterState requires parent to be of type Character");
+			return;
+		case NOTIFICATION_READY:
+			if (start_active) {
+				callable_mp(this, &self_type::set_state_active).call_deferred(true);
+			}
+			return;
+	}
+}
+
+PackedStringArray CharacterState::get_configuration_warnings() const {
+	PackedStringArray warnings{ super_type::get_configuration_warnings() };
+	if (cast_to<Character>(get_parent()) == nullptr) {
+		warnings.push_back("CharacterState requires direct Character parent");
+	}
+	return warnings;
+}
+
+void CharacterState::switch_to_state(String value) {
+	if (!this->state_active) {
+		print_error(vformat("Attempt to switch from inactive state %s to new state %s", get_path(), value));
+		return;
+	}
+	set_state_active(false);
+	stack_state_independent(value);
+}
+
+void CharacterState::stack_state_dependent(String value) {
+	if (!this->state_active) {
+		print_error(vformat("Attempt to stack dependent state %s from inactive state %s", value, get_path()));
+		return;
+	}
+	Node *node{ get_parent()->get_node(value) };
+	if (CharacterState * state{ cast_to<CharacterState>(node) }) {
+		state->depending_state = this;
+		this->dependent_states.insert(state);
+		state->set_state_active(true);
+	}
+}
+
+void CharacterState::notify_dependent_inactive(CharacterState *state) {
+	if (!this->state_active) {
+		print_error(vformat("Received notification that dependent state %s became inactive, while depending state %s was inactive", state->get_path(), get_path()));
+		return;
+	}
+	this->dependent_states.erase(state);
+}
+
+void CharacterState::stack_state_independent(String value) {
+	if (!this->state_active) {
+		print_error(vformat("Attempt to stack state %s from inactive state %s", value, get_path()));
+		return;
+	}
+	Node *node{ get_parent()->get_node(value) };
+	if (CharacterState * state{ cast_to<CharacterState>(node) }) {
+		state->set_state_active(true);
+	} else {
+		print_error(vformat("Attempt to stack nonexistent state %s from %s", value, get_path()));
+	}
+}
+
+void CharacterState::set_state_active(bool active) {
+	if (this->state_active != active) {
+		this->state_active = active;
+		if (active) {
+			state_entered();
+		} else {
+			state_exited();
+			if (this->depending_state && this->depending_state->state_active) {
+				this->depending_state->notify_dependent_inactive(this);
+			}
+			this->depending_state = nullptr;
+			for (CharacterState *state : this->dependent_states) {
+				state->set_state_active(false);
+			}
+			this->dependent_states.clear();
+		}
+	}
+}
+
+bool CharacterState::get_state_active() const {
+	return this->state_active;
+}
+
+Character *CharacterState::get_character() const {
+	return this->character;
+}

modules/authority/character.h

@@ -0,0 +1,69 @@
+#pragma once
+
+#include "core/io/resource.h"
+#include "core/templates/hash_set.h"
+#include "macros.h"
+#include "scene/3d/physics/character_body_3d.h"
+
+class CharacterData : public Resource {
+	GDCLASS(CharacterData, Resource);
+	static void _bind_methods();
+
+private:
+	float speed{};
+
+public:
+	GET_SET_FNS(float, speed);
+};
+
+class Character : public CharacterBody3D {
+	GDCLASS(Character, CharacterBody3D);
+
+protected:
+	static void _bind_methods();
+	void physics_process(double delta);
+	void _notification(int what);
+	PackedStringArray get_configuration_warnings() const override;
+
+public:
+	void set_movement(Vector2 movement);
+	bool is_moving() const;
+
+private:
+	Ref<CharacterData> data{};
+	Vector2 world_movement_direction{};
+
+public:
+	GET_SET_FNS(Ref<CharacterData>, data);
+};
+
+class CharacterState : public Node {
+	GDCLASS(CharacterState, Node);
+	static void _bind_methods();
+
+protected:
+	void _notification(int what);
+	PackedStringArray get_configuration_warnings() const override;
+	void switch_to_state(String state);
+	void stack_state_dependent(String state);
+	void notify_dependent_inactive(CharacterState *dependent);
+	void stack_state_independent(String state);
+	virtual void state_entered() {}
+	virtual void state_exited() {}
+
+public:
+	void set_state_active(bool active);
+	bool get_state_active() const;
+	Character *get_character() const;
+
+private:
+	bool start_active{ false };
+	bool state_active{ false };
+
+	Character *character{ nullptr };
+	HashSet<CharacterState *> dependent_states{};
+	CharacterState *depending_state{ nullptr };
+
+public:
+	GET_SET_FNS(bool, start_active);
+};

modules/authority/nav_marker.cpp

@@ -0,0 +1,13 @@
+#include "nav_marker.h"
+
+void NavMarker::_bind_methods() {}
+
+void NavMarker::_notification(int what) {
+	switch (what) {
+		default:
+			return;
+		case NOTIFICATION_ENTER_TREE:
+			this->set_gizmo_extents(3);
+			return;
+	}
+}

modules/authority/nav_marker.h

@@ -0,0 +1,19 @@
+#pragma once
+
+#include "macros.h"
+#include "scene/3d/marker_3d.h"
+class Character;
+
+class NavMarker : public Marker3D {
+	GDCLASS(NavMarker, Marker3D);
+	static void _bind_methods();
+
+protected:
+	void _notification(int what);
+
+private:
+	Character *claimed{ nullptr };
+
+public:
+	GET_SET_FNS(Character *, claimed);
+};

modules/authority/party_member_states.cpp

@@ -0,0 +1,84 @@
+#include "party_member_states.h"
+#include "authority/nav_marker.h"
+#include "authority/player_character.h"
+#include "core/config/engine.h"
+#include "core/error/error_macros.h"
+#include "core/templates/vector.h"
+
+void PartyMemberFollow::_bind_methods() {}
+
+void PartyMemberFollow::process_position_target() {
+	Vector3 const marker_position{ this->claimed_marker->get_global_position() };
+	Vector3 const nav_target{ this->nav->get_target_position() };
+	Vector3 const global_position{ get_character()->get_global_position() };
+	if (global_position.distance_squared_to(marker_position) < 0.5) {
+		return;
+	}
+	if (nav_target.distance_squared_to(marker_position) > 0.25) {
+		this->nav->set_target_position(marker_position);
+	}
+	if (this->nav->is_navigation_finished()) {
+		return;
+	}
+	Vector3 velocity{ global_position.direction_to(this->nav->get_next_path_position()) };
+	velocity.y = 0;
+	if (this->nav->get_avoidance_enabled()) {
+		this->nav->set_velocity(velocity * get_character()->get_data()->get_speed());
+	} else {
+		push_movement_direction(velocity * get_character()->get_data()->get_speed());
+	}
+}
+
+void PartyMemberFollow::push_movement_direction(Vector3 velocity) {
+	get_character()->set_movement(Vector2{ velocity.x, velocity.z });
+}
+
+void PartyMemberFollow::_notification(int what) {
+	if (Engine::get_singleton()->is_editor_hint()) {
+		return;
+	}
+	switch (what) {
+		default:
+			return;
+		case NOTIFICATION_READY:
+			this->nav = cast_to<NavigationAgent3D>(get_parent()->get_node(NodePath("%NavigationAgent3D")));
+			ERR_FAIL_COND_EDMSG(this->nav == nullptr, "PartyMemberFollow cannot initialise without a navigation agent");
+			return;
+		case NOTIFICATION_PROCESS:
+			process_position_target();
+			return;
+	}
+}
+
+PackedStringArray PartyMemberFollow::get_configuration_warnings() const {
+	PackedStringArray warnings{ super_type::get_configuration_warnings() };
+	if (!get_parent()->has_node(NodePath("%NavigationAgent3D")) || !cast_to<NavigationAgent3D>(get_parent()->get_node(NodePath("%NavigationAgent3D")))) {
+		warnings.push_back("PartyMemberFollow expects a scene sibling of type NavigationAgent3D named with unique name '%NavigationAgent3D'");
+	}
+	return warnings;
+}
+
+void PartyMemberFollow::state_entered() {
+	Vector<NavMarker *> const &markers{ PlayerCharacter::get_singleton()->get_party_follow_markers() };
+	for (NavMarker *marker : markers) {
+		if (marker->get_claimed() == nullptr) {
+			marker->set_claimed(get_character());
+			this->claimed_marker = marker;
+			if (this->nav->get_avoidance_enabled()) {
+				this->nav->connect("velocity_computed", callable_mp(this, &self_type::push_movement_direction));
+			}
+			set_process(true);
+			return;
+		}
+	}
+	ERR_FAIL_EDMSG("PartyMemberFollow could not find an unclaimed player follow marker");
+	set_state_active(false);
+}
+
+void PartyMemberFollow::state_exited() {
+	if (this->claimed_marker) {
+		this->claimed_marker->set_claimed(nullptr);
+		this->nav->disconnect("velocity_computed", callable_mp(this, &self_type::push_movement_direction));
+		set_process(false);
+	}
+}

modules/authority/party_member_states.h

@@ -0,0 +1,22 @@
+#pragma once
+
+#include "authority/character.h"
+#include "authority/nav_marker.h"
+#include "scene/3d/navigation/navigation_agent_3d.h"
+
+class PartyMemberFollow : public CharacterState {
+	GDCLASS(PartyMemberFollow, CharacterState);
+	static void _bind_methods();
+	void process_position_target();
+	void push_movement_direction(Vector3 velocity);
+
+protected:
+	void _notification(int what);
+	PackedStringArray get_configuration_warnings() const override;
+	void state_entered() override;
+	void state_exited() override;
+
+private:
+	NavigationAgent3D *nav{ nullptr };
+	NavMarker *claimed_marker{ nullptr };
+};

modules/authority/player_camera.h

@@ -0,0 +1,8 @@
+#pragma once
+
+#include "scene/3d/camera_3d.h"
+
+class PlayerCamera : public Camera3D {
+	GDCLASS(PlayerCamera, Camera3D);
+	static void _bind_methods();
+};

modules/authority/player_character.cpp

@@ -0,0 +1,36 @@
+#include "player_character.h"
+#include "authority/nav_marker.h"
+
+void PlayerCharacter::_bind_methods() {}
+
+void PlayerCharacter::_notification(int what) {
+	if (Engine::get_singleton()->is_editor_hint()) {
+		return;
+	}
+	switch (what) {
+		default:
+			return;
+		case NOTIFICATION_ENTER_TREE:
+			instance = this;
+			return;
+		case NOTIFICATION_READY:
+			for (Variant var : find_children("*", "NavMarker")) {
+				if (NavMarker * marker{ cast_to<NavMarker>(var) }) {
+					this->party_follow_markers.push_back(marker);
+				}
+			}
+			ERR_FAIL_COND_EDMSG(this->party_follow_markers.size() < 4, "PlayerCharacter should have at least 4 follow NavMarkers for party members");
+			return;
+		case NOTIFICATION_EXIT_TREE:
+			if (instance == this) {
+				instance = nullptr;
+			}
+			return;
+	}
+}
+
+PlayerCharacter *PlayerCharacter::instance{ nullptr };
+
+PlayerCharacter *PlayerCharacter::get_singleton() {
+	return instance;
+}

modules/authority/player_character.h

@@ -0,0 +1,21 @@
+#pragma once
+
+#include "authority/character.h"
+#include "authority/nav_marker.h"
+#include "macros.h"
+
+class PlayerCharacter : public Character {
+	GDCLASS(PlayerCharacter, Character);
+	static void _bind_methods();
+
+protected:
+	void _notification(int what);
+
+private:
+	Vector<NavMarker *> party_follow_markers{};
+	static PlayerCharacter *instance;
+
+public:
+	static PlayerCharacter *get_singleton();
+	GET_SET_FNS(Vector<NavMarker *> const &, party_follow_markers);
+};

modules/authority/player_states.cpp

@@ -0,0 +1,75 @@
+#include "player_states.h"
+#include "core/input/input.h"
+#include "core/math/basis.h"
+#include "scene/3d/camera_3d.h"
+#include "scene/main/viewport.h"
+
+void PlayerInputState::_bind_methods() {}
+
+void PlayerInputState::unhandled_input(Ref<InputEvent> const &what) {
+	bool const is_move_vertical{ what->is_action("move_forward") || what->is_action("move_backward") };
+	bool const is_move_horizontal{ what->is_action("move_right") || what->is_action("move_left") };
+	if (is_move_vertical || is_move_horizontal) {
+		stack_state_dependent("PlayerMovementState");
+		get_viewport()->set_input_as_handled();
+	}
+}
+
+void PlayerInputState::state_entered() {
+	set_process_unhandled_input(true);
+}
+
+void PlayerInputState::state_exited() {
+	set_process_unhandled_input(false);
+}
+
+void PlayerMovementState::_bind_methods() {}
+
+void PlayerMovementState::process(double delta) {
+	Basis const basis{ get_viewport()->get_camera_3d()->get_global_basis() };
+	Vector2 backward{ basis.get_column(0).x, basis.get_column(0).z };
+	if (backward.is_zero_approx()) {
+		backward = Vector2{ basis.get_column(1).x, basis.get_column(1).z };
+	}
+	Vector2 const right{ basis.get_column(2).x, basis.get_column(2).z };
+	get_character()->set_movement((backward.normalized() * this->movement.x + right.normalized() * this->movement.y) * get_character()->get_data()->get_speed());
+}
+
+void PlayerMovementState::_notification(int what) {
+	if (Engine::get_singleton()->is_editor_hint()) {
+		return;
+	}
+	switch (what) {
+		default:
+			return;
+		case NOTIFICATION_READY:
+			set_process_input(true);
+			return;
+		case NOTIFICATION_PROCESS:
+			process(get_process_delta_time());
+			return;
+	}
+}
+
+void PlayerMovementState::input(Ref<InputEvent> const &what) {
+	bool const is_move_vertical{ what->is_action("move_forward") || what->is_action("move_backward") };
+	bool const is_move_horizontal{ what->is_action("move_right") || what->is_action("move_left") };
+	if (is_move_vertical || is_move_horizontal) {
+		this->movement = {
+			Input::get_singleton()->get_axis("move_left", "move_right"),
+			Input::get_singleton()->get_axis("move_forward", "move_backward")
+		};
+		this->movement.normalize();
+	}
+	if (this->get_state_active() && this->movement.is_zero_approx()) {
+		set_state_active(false);
+	}
+}
+
+void PlayerMovementState::state_entered() {
+	set_process(true);
+}
+
+void PlayerMovementState::state_exited() {
+	set_process(false);
+}

modules/authority/player_states.h

@@ -0,0 +1,29 @@
+#pragma once
+
+#include "authority/character.h"
+
+class PlayerInputState : public CharacterState {
+	GDCLASS(PlayerInputState, CharacterState);
+	static void _bind_methods();
+
+protected:
+	void unhandled_input(Ref<InputEvent> const &event) override;
+	void state_entered() override;
+	void state_exited() override;
+};
+
+class PlayerMovementState : public CharacterState {
+	GDCLASS(PlayerMovementState, CharacterState);
+	static void _bind_methods();
+	void ready();
+	void process(double delta);
+
+protected:
+	void _notification(int what);
+	void input(Ref<InputEvent> const &event) override;
+	void state_entered() override;
+	void state_exited() override;
+
+private:
+	Vector2 movement{};
+};

modules/authority/register_types.cpp

@@ -0,0 +1,28 @@
+#include "register_types.h"
+
+#include "authority/character.h"
+#include "authority/nav_marker.h"
+#include "authority/party_member_states.h"
+#include "authority/player_character.h"
+#include "authority/player_states.h"
+#include "core/object/class_db.h"
+
+void initialize_authority_module(ModuleInitializationLevel p_level) {
+	if (p_level != MODULE_INITIALIZATION_LEVEL_SCENE) {
+		return;
+	}
+	ClassDB::register_class<CharacterData>();
+	ClassDB::register_class<Character>();
+	ClassDB::register_class<CharacterState>();
+	ClassDB::register_class<PlayerCharacter>();
+	ClassDB::register_class<PlayerInputState>();
+	ClassDB::register_class<PlayerMovementState>();
+	ClassDB::register_class<NavMarker>();
+	ClassDB::register_class<PartyMemberFollow>();
+}
+
+void uninitialize_authority_module(ModuleInitializationLevel p_level) {
+	if (p_level != MODULE_INITIALIZATION_LEVEL_SCENE) {
+		return;
+	}
+}

modules/authority/register_types.h

@@ -0,0 +1,9 @@
+#ifndef authority_REGISTER_TYPES_H
+#define authority_REGISTER_TYPES_H
+
+#include "modules/register_module_types.h"
+
+void initialize_authority_module(ModuleInitializationLevel p_level);
+void uninitialize_authority_module(ModuleInitializationLevel p_level);
+
+#endif // !authority_REGISTER_TYPES_H

modules/behaviour_nodes/SCsub

@@ -0,0 +1,3 @@
+Import('env')
+
+env.add_source_files(env.modules_sources, "*.cpp")

modules/behaviour_nodes/behaviour_action.cpp

@@ -0,0 +1,31 @@
+#include "behaviour_action.h"
+#include "core/object/object.h"
+
+void BehaviourAction::_bind_methods() {
+	ClassDB::add_virtual_method(get_class_static(), _gdvirtual__execute_get_method_info());
+	ClassDB::add_virtual_method(get_class_static(), _gdvirtual__exit_get_method_info());
+	ClassDB::add_virtual_method(get_class_static(), _gdvirtual__enter_get_method_info());
+}
+
+void BehaviourAction::enter() {
+	GDVIRTUAL_CALL(_enter);
+}
+
+void BehaviourAction::execute() {
+	Status out_status{ Fail };
+	GDVIRTUAL_CALL(_execute, out_status);
+	set_status(out_status);
+}
+
+void BehaviourAction::exit() {
+	GDVIRTUAL_CALL(_exit);
+}
+
+BehaviourNode *BehaviourAction::get_next() {
+	switch (get_status()) {
+		case Running:
+			return this;
+		default:
+			return cast_to<BehaviourNode>(get_parent());
+	}
+}

modules/behaviour_nodes/behaviour_action.h

@@ -0,0 +1,17 @@
+#pragma once
+
+#include "behaviour_nodes/behaviour_node.h"
+
+class BehaviourAction : public BehaviourNode {
+	GDCLASS(BehaviourAction, BehaviourNode);
+	static void _bind_methods();
+
+public:
+	void enter() override;
+	void execute() override;
+	void exit() override;
+	BehaviourNode *get_next() override;
+	GDVIRTUAL0R_REQUIRED(Status, _execute);
+	GDVIRTUAL0(_enter);
+	GDVIRTUAL0(_exit);
+};

modules/behaviour_nodes/behaviour_composite.cpp

@@ -0,0 +1,28 @@
+#include "behaviour_composite.h"
+
+void BehaviourComposite::_bind_methods() {}
+
+void BehaviourComposite::child_order_changed() {
+	this->child_behaviours.clear();
+	for (Variant var : get_children()) {
+		if (BehaviourNode * node{ cast_to<BehaviourNode>(var) }) {
+			this->child_behaviours.push_back(node);
+		}
+	}
+}
+
+void BehaviourComposite::_notification(int what) {
+	switch (what) {
+		default:
+			return;
+		case NOTIFICATION_READY:
+			child_order_changed();
+			set_leaf(get_child_behaviours().is_empty());
+			return;
+		case NOTIFICATION_CHILD_ORDER_CHANGED:
+			if (is_ready()) {
+				child_order_changed();
+			}
+			return;
+	}
+}

modules/behaviour_nodes/behaviour_composite.h

@@ -0,0 +1,18 @@
+#pragma once
+#include "behaviour_nodes/behaviour_node.h"
+
+class BehaviourComposite : public BehaviourNode {
+	GDCLASS(BehaviourComposite, BehaviourNode);
+	static void _bind_methods();
+	void child_order_changed();
+
+protected:
+	void _notification(int what);
+
+private:
+	Vector<BehaviourNode *> child_behaviours{};
+
+public:
+	Vector<BehaviourNode *> const &get_child_behaviours() const { return this->child_behaviours; }
+	GET_SET_REF_FNS(Vector<BehaviourNode *>, child_behaviours);
+};

modules/behaviour_nodes/behaviour_node.cpp

@@ -0,0 +1,29 @@
+#include "behaviour_node.h"
+#include "behaviour_nodes/behaviour_tree.h"
+#include "core/config/engine.h"
+
+void BehaviourNode::_bind_methods() {
+	BIND_ENUM_CONSTANT(Fail);
+	BIND_ENUM_CONSTANT(Running);
+	BIND_ENUM_CONSTANT(Success);
+}
+
+void BehaviourNode::_notification(int what) {
+	if (Engine::get_singleton()->is_editor_hint()) {
+		return;
+	}
+	switch (what) {
+		default:
+			return;
+		case NOTIFICATION_ENTER_TREE:
+			Node *parent{ get_parent() };
+			this->parent = cast_to<BehaviourNode>(parent);
+			while (this->behaviour_tree == nullptr && parent != nullptr) {
+				if ((this->behaviour_tree = cast_to<BehaviourTree>(parent))) {
+					break;
+				}
+				parent = parent->get_parent();
+			}
+			return;
+	}
+}

modules/behaviour_nodes/behaviour_node.h

@@ -0,0 +1,34 @@
+#pragma once
+
+#include "macros.h"
+#include "scene/main/node.h"
+
+class BehaviourNode : public Node {
+	GDCLASS(BehaviourNode, Node);
+	static void _bind_methods();
+
+public:
+	GDENUM(Status, Fail, Running, Success);
+
+protected:
+	void _notification(int what);
+
+public:
+	virtual void enter() {}
+	virtual void execute() {}
+	virtual void exit() {}
+	virtual BehaviourNode *get_next() { return this; }
+
+private:
+	class BehaviourTree *behaviour_tree{ nullptr };
+	BehaviourNode *parent{ nullptr };
+	Status status{};
+	bool leaf{ false };
+
+public:
+	GET_SET_FNS(class BehaviourTree *, behaviour_tree);
+	GET_SET_FNS(Status, status);
+	GET_SET_FNS(bool, leaf);
+};
+
+MAKE_TYPE_INFO(BehaviourNode::Status, Variant::INT);

modules/behaviour_nodes/behaviour_tree.cpp

@@ -0,0 +1,52 @@
+#include "behaviour_tree.h"
+#include "behaviour_nodes/behaviour_node.h"
+#include "behaviour_nodes/control_nodes.h"
+#include "core/config/engine.h"
+
+void BehaviourTree::_bind_methods() {}
+
+void BehaviourTree::process() {
+	this->current->execute();
+	while (execute_next()) {
+		this->current->execute();
+	}
+}
+
+void BehaviourTree::_notification(int what) {
+	if (Engine::get_singleton()->is_editor_hint()) {
+		return;
+	}
+	switch (what) {
+		default:
+			return;
+		case NOTIFICATION_READY:
+			for (Variant var : get_children()) {
+				if ((this->current = cast_to<BehaviourNode>(var))) {
+					break;
+				}
+			}
+			ERR_FAIL_COND_EDMSG(this->current == nullptr, "No valid BehaviourNode in BehaviourTree");
+			set_process(true);
+			return;
+		case NOTIFICATION_PROCESS:
+			process();
+			return;
+	}
+}
+
+bool BehaviourTree::execute_next() {
+	BehaviourNode *next{ this->current->get_next() };
+	if (next == this->current) {
+		return false;
+	} else {
+		ERR_FAIL_COND_V_EDMSG(next == nullptr, false, vformat("%s::get_next returned a nullptr, repeating last node", this->current->get_class()));
+		if (this->current != next->get_parent()) {
+			this->current->exit();
+		}
+		if (this->current->get_parent() != next) {
+			next->enter();
+		}
+		this->current = next;
+		return cast_to<BehaviourComposite>(this->current);
+	}
+}

modules/behaviour_nodes/behaviour_tree.h

@@ -0,0 +1,18 @@
+#pragma once
+
+#include "scene/main/node.h"
+
+class BehaviourTree : public Node {
+	GDCLASS(BehaviourTree, Node);
+	static void _bind_methods();
+	void process();
+
+protected:
+	void _notification(int what);
+
+public:
+	bool execute_next();
+
+private:
+	class BehaviourNode *current{ nullptr };
+};

modules/behaviour_nodes/config.py

@@ -0,0 +1,5 @@
+def can_build(env, platform):
+    return True;
+
+def configure(env):
+    pass;

modules/behaviour_nodes/control_nodes.cpp

@@ -0,0 +1,121 @@
+#include "control_nodes.h"
+#include "behaviour_nodes/behaviour_node.h"
+
+PackedStringArray BehaviourSequence::get_configuration_warnings() const {
+	PackedStringArray warnings{ super_type::get_configuration_warnings() };
+	if (get_child_behaviours().is_empty()) {
+		warnings.push_back("Sequence cannot have zero children");
+	}
+	return warnings;
+}
+
+void BehaviourSequence::execute() {
+	if (get_child_behaviours().is_empty()) {
+		set_status(Fail);
+		ERR_FAIL_EDMSG("BehaviourSequence executed with no children.");
+	} else if (get_status() == Running && this->current >= 0 && this->current < get_child_behaviours().size()) {
+		switch (get_child_behaviours().get(this->current)->get_status()) {
+			case Running:
+				set_status(Running);
+				break;
+			case Fail:
+				set_status(Fail);
+				break;
+			case Success:
+				++this->current;
+				set_status(this->current >= get_child_behaviours().size()
+								? Success
+								: Running);
+				break;
+		}
+	} else {
+		set_status(Running);
+		this->current = 0;
+	}
+}
+
+BehaviourNode *BehaviourSequence::get_next() {
+	return get_status() == Running
+			? get_child_behaviours().get(this->current)
+			: cast_to<BehaviourNode>(get_parent());
+}
+
+PackedStringArray BehaviourSelector::get_configuration_warnings() const {
+	PackedStringArray warnings{ super_type::get_configuration_warnings() };
+	if (get_child_behaviours().is_empty()) {
+		warnings.push_back("Selector cannot have zero children");
+	}
+	return warnings;
+}
+
+void BehaviourSelector::execute() {
+	if (get_child_behaviours().is_empty()) {
+		set_status(Fail);
+		ERR_FAIL_EDMSG("BehaviourSelector execution with no children.");
+	} else if (get_status() == Running && this->current >= 0 && this->current < get_child_behaviours().size()) {
+		switch (get_child_behaviours().get(this->current)->get_status()) {
+			case Running:
+				set_status(Running);
+				break;
+			case Fail:
+				++this->current;
+				set_status(this->current >= get_child_behaviours().size()
+								? Fail
+								: Running);
+				break;
+			case Success:
+				set_status(Success);
+				break;
+		}
+	} else {
+		set_status(Running);
+		this->current = 0;
+	}
+}
+
+BehaviourNode *BehaviourSelector::get_next() {
+	return get_status() == Running
+			? get_child_behaviours().get(this->current)
+			: cast_to<BehaviourNode>(get_parent());
+}
+
+PackedStringArray BehaviourRepeater::get_configuration_warnings() const {
+	PackedStringArray warnings{ super_type::get_configuration_warnings() };
+	if (get_child_behaviours().size() != 1) {
+		warnings.push_back(vformat("Repeater should have exactly one BehaviourNode child, has %d", get_child_behaviours().size()));
+	}
+	return warnings;
+}
+
+void BehaviourRepeater::execute() {
+	set_status(Running);
+}
+
+BehaviourNode *BehaviourRepeater::get_next() {
+	return get_child_behaviours().get(0);
+}
+
+PackedStringArray BehaviourRepeatUntilFail::get_configuration_warnings() const {
+	PackedStringArray warnings{ super_type::get_configuration_warnings() };
+	if (get_child_behaviours().size() != 1) {
+		warnings.push_back("RepeatUntilFailure should have exactly one BehaviourNode child");
+	}
+	return warnings;
+}
+
+void BehaviourRepeatUntilFail::execute() {
+	if (get_child_behaviours().is_empty()) {
+		set_status(Fail);
+		ERR_FAIL_EDMSG("BehaviourRepeatUntilFail execution with no child");
+	} else {
+		set_status(get_child_behaviours().get(0)->get_status() == Fail
+						? Success
+						: Running);
+	}
+}
+
+BehaviourNode *BehaviourRepeatUntilFail::get_next() {
+	return get_status() == Running
+			? get_child_behaviours().get(0)
+			: cast_to<BehaviourNode>(get_parent());
+}

modules/behaviour_nodes/control_nodes.h

@@ -0,0 +1,50 @@
+#pragma once
+#include "behaviour_nodes/behaviour_composite.h"
+#include "behaviour_nodes/behaviour_node.h"
+#include "core/variant/variant.h"
+
+class BehaviourSequence : public BehaviourComposite {
+	GDCLASS(BehaviourSequence, BehaviourComposite);
+	static void _bind_methods() {}
+
+public:
+	PackedStringArray get_configuration_warnings() const override;
+	void execute() override;
+	BehaviourNode *get_next() override;
+
+private:
+	int current{ -1 };
+};
+
+class BehaviourSelector : public BehaviourComposite {
+	GDCLASS(BehaviourSelector, BehaviourComposite);
+	static void _bind_methods() {}
+
+public:
+	PackedStringArray get_configuration_warnings() const override;
+	void execute() override;
+	BehaviourNode *get_next() override;
+
+private:
+	int current{ -1 };
+};
+
+class BehaviourRepeater : public BehaviourComposite {
+	GDCLASS(BehaviourRepeater, BehaviourComposite);
+	static void _bind_methods() {}
+
+public:
+	PackedStringArray get_configuration_warnings() const override;
+	void execute() override;
+	BehaviourNode *get_next() override;
+};
+
+class BehaviourRepeatUntilFail : public BehaviourComposite {
+	GDCLASS(BehaviourRepeatUntilFail, BehaviourComposite);
+	static void _bind_methods() {}
+
+public:
+	PackedStringArray get_configuration_warnings() const override;
+	void execute() override;
+	BehaviourNode *get_next() override;
+};

modules/behaviour_nodes/decorator_nodes.cpp

@@ -0,0 +1,30 @@
+#include "decorator_nodes.h"
+#include "behaviour_nodes/behaviour_node.h"
+#include "core/variant/variant.h"
+
+void BehaviourAlwaysSuccess::_bind_methods() {}
+
+PackedStringArray BehaviourAlwaysSuccess::get_configuration_warnings() const {
+	PackedStringArray warnings{ super_type::get_configuration_warnings() };
+	if (get_child_behaviours().size() != 1) {
+		warnings.push_back("BehaviourAlwaysSuccess should have exactly one child");
+	}
+	return warnings;
+}
+
+void BehaviourAlwaysSuccess::execute() {
+	if (get_child_behaviours().is_empty()) {
+		set_status(Fail);
+		ERR_FAIL_EDMSG("BehaviourSequence executed with no children.");
+	} else if (get_status() == Running) {
+		set_status(get_child_behaviours().get(0)->get_status() == Running ? Running : Success);
+	} else {
+		set_status(Running);
+	}
+}
+
+BehaviourNode *BehaviourAlwaysSuccess::get_next() {
+	return get_status() == Running
+			? get_child_behaviours().get(0)
+			: cast_to<BehaviourNode>(get_parent());
+}

modules/behaviour_nodes/decorator_nodes.h

@@ -0,0 +1,15 @@
+#pragma once
+
+#include "behaviour_nodes/behaviour_composite.h"
+#include "behaviour_nodes/behaviour_node.h"
+#include "core/variant/variant.h"
+
+class BehaviourAlwaysSuccess : public BehaviourComposite {
+	GDCLASS(BehaviourAlwaysSuccess, BehaviourComposite);
+	static void _bind_methods();
+
+public:
+	PackedStringArray get_configuration_warnings() const override;
+	void execute() override;
+	BehaviourNode *get_next() override;
+};

modules/behaviour_nodes/register_types.cpp

@@ -0,0 +1,27 @@
+#include "behaviour_nodes/register_types.h"
+#include "behaviour_nodes/behaviour_action.h"
+#include "behaviour_nodes/behaviour_node.h"
+#include "behaviour_nodes/behaviour_tree.h"
+#include "behaviour_nodes/control_nodes.h"
+#include "behaviour_nodes/decorator_nodes.h"
+#include "core/object/class_db.h"
+
+void initialize_behaviour_nodes_module(ModuleInitializationLevel p_level) {
+	if (p_level != MODULE_INITIALIZATION_LEVEL_SCENE) {
+		return;
+	}
+	ClassDB::register_class<BehaviourTree>();
+	ClassDB::register_abstract_class<BehaviourNode>();
+	ClassDB::register_class<BehaviourSequence>();
+	ClassDB::register_class<BehaviourRepeater>();
+	ClassDB::register_class<BehaviourSelector>();
+	ClassDB::register_class<BehaviourAction>();
+	ClassDB::register_class<BehaviourRepeatUntilFail>();
+	ClassDB::register_class<BehaviourAlwaysSuccess>();
+}
+
+void uninitialize_behaviour_nodes_module(ModuleInitializationLevel p_level) {
+	if (p_level != MODULE_INITIALIZATION_LEVEL_SCENE) {
+		return;
+	}
+}

modules/behaviour_nodes/register_types.h

@@ -0,0 +1,9 @@
+#ifndef BEHAVIOUR_NODES_REGISTER_TYPES_H
+#define BEHAVIOUR_NODES_REGISTER_TYPES_H
+
+#include "modules/register_module_types.h"
+
+void initialize_behaviour_nodes_module(ModuleInitializationLevel p_level);
+void uninitialize_behaviour_nodes_module(ModuleInitializationLevel p_level);
+
+#endif // !BEHAVIOUR_NODES_REGISTER_TYPES_H

modules/macros.h

@@ -0,0 +1,52 @@
+#ifndef GODOT_EXTRA_MACROS_H
+#define GODOT_EXTRA_MACROS_H
+
+#define BIND_GET_SET(m_property)                                    \
+	ClassDB::bind_method(D_METHOD("set_" #m_property, #m_property), \
+			&self_type::set_##m_property);                          \
+	ClassDB::bind_method(D_METHOD("get_" #m_property),              \
+			&self_type::get_##m_property)
+
+#define BIND_HPROPERTY(m_type, m_property, ...)                  \
+	BIND_GET_SET(m_property);                                    \
+	ADD_PROPERTY(PropertyInfo(m_type, #m_property, __VA_ARGS__), \
+			"set_" #m_property, "get_" #m_property)
+
+#define BIND_PROPERTY(m_type, m_property)                               \
+	BIND_GET_SET(m_property);                                           \
+	ADD_PROPERTY(PropertyInfo(m_type, #m_property), "set_" #m_property, \
+			"get_" #m_property)
+
+#define GET_SET_FNS(m_type, m_property)   \
+	m_type get_##m_property() const {     \
+		return this->m_property;          \
+	}                                     \
+	void set_##m_property(m_type value) { \
+		this->m_property = value;         \
+	}
+#define GET_SET_REF_FNS(m_type, m_property) \
+	m_type &get_##m_property() {            \
+		return this->m_property;            \
+	}                                       \
+	void set_##m_property(m_type &value) {  \
+		this->m_property = value;           \
+	}
+
+#define GET_SET_FNS_EX(m_type, m_property, m_ex) \
+	m_type get_##m_property() const {            \
+		return this->m_property;                 \
+	}                                            \
+	void set_##m_property(m_type value) {        \
+		m_ex;                                    \
+		this->m_property = value;                \
+	}
+
+#define __VA_ARGS__STRING(...) String(#__VA_ARGS__)
+
+#define GDENUM(M_Name, ...)                    \
+	enum M_Name { __VA_ARGS__ };               \
+	static String M_Name##_hint() {            \
+		return __VA_ARGS__STRING(__VA_ARGS__); \
+	}
+
+#endif // !GODOT_EXTRA_MACROS_H

modules/terrain/SCsub

@@ -0,0 +1,3 @@
+Import('env')
+
+env.add_source_files(env.modules_sources, "*.cpp")

modules/terrain/config.py

@@ -0,0 +1,5 @@
+def can_build(env, platform):
+    return True;
+
+def configure(env):
+    pass;

modules/terrain/register_types.cpp

@@ -0,0 +1,24 @@
+#include "register_types.h"
+
+#include "core/object/class_db.h"
+#include "terrain/terrain.h"
+#include "terrain/terrain_chunk.h"
+#include "terrain/terrain_modifier.h"
+
+void initialize_terrain_module(ModuleInitializationLevel p_level) {
+	if (p_level != MODULE_INITIALIZATION_LEVEL_SCENE) {
+		return;
+	}
+	ClassDB::register_class<Terrain>();
+	ClassDB::register_abstract_class<TerrainModifier>();
+	ClassDB::register_class<TerrainModifierDistance>();
+	ClassDB::register_class<TerrainModifierPath>();
+	ClassDB::register_class<TerrainModifierPathPoint>();
+	ClassDB::register_class<TerrainChunkMesh>();
+}
+
+void uninitialize_terrain_module(ModuleInitializationLevel p_level) {
+	if (p_level != MODULE_INITIALIZATION_LEVEL_SCENE) {
+		return;
+	}
+}

modules/terrain/register_types.h

@@ -0,0 +1,9 @@
+#ifndef TERRAIN_REGISTER_TYPES_H
+#define TERRAIN_REGISTER_TYPES_H
+
+#include "modules/register_module_types.h"
+
+void initialize_terrain_module(ModuleInitializationLevel p_level);
+void uninitialize_terrain_module(ModuleInitializationLevel p_level);
+
+#endif // !TERRAIN_REGISTER_TYPES_H

modules/terrain/terrain.cpp

@@ -0,0 +1,271 @@
+#include "terrain.h"
+#include "terrain/terrain_chunk.h"
+#include "terrain/terrain_modifier.h"
+
+void Terrain::_bind_methods() {
+	BIND_HPROPERTY(Variant::OBJECT, mesh_material, PROPERTY_HINT_RESOURCE_TYPE, "Material");
+	BIND_PROPERTY(Variant::INT, side_length);
+	BIND_PROPERTY(Variant::INT, chunk_size);
+	BIND_PROPERTY(Variant::INT, detail);
+	BIND_PROPERTY(Variant::INT, thread_count);
+}
+
+void Terrain::child_order_changed() {
+	this->modifiers.clear();
+	for (Variant var : get_children()) {
+		if (TerrainModifier * mod{ cast_to<TerrainModifier>(var) }) {
+			mod->set_terrain(this);
+			this->modifiers.push_back(mod);
+		}
+	}
+}
+
+void Terrain::update_meshes() {
+	size_t num{ 1 };
+	this->dirty_meshes_lock.lock();
+	num = num > this->dirty_meshes.size() ? this->dirty_meshes.size() : num;
+	this->dirty_meshes_lock.unlock();
+	for (size_t i{ 0 }; i < num; i++) {
+		this->dirty_meshes_lock.lock();
+		TerrainChunkMesh *mesh{ this->dirty_meshes[0] };
+		this->dirty_meshes.remove_at(0);
+		this->dirty_meshes_lock.unlock();
+		mesh->apply_new_mesh();
+	}
+}
+
+void Terrain::update_threads() {
+	this->workload_lock.lock();
+	if (this->workload.is_empty()) {
+		this->threads_stop = true;
+		this->workload_lock.unlock();
+		for (Thread &thread : this->threads) {
+			if (thread.is_started()) {
+				thread.wait_to_finish();
+			}
+		}
+	} else {
+		this->threads_stop = false;
+		for (Thread &thread : this->threads) {
+			if (!thread.is_started()) {
+				thread.start(Terrain::generate_meshes_thread, this);
+			}
+		}
+		this->workload_lock.unlock();
+	}
+}
+
+void Terrain::synchronous_generate_terrain() {
+	this->workload_lock.lock();
+	this->threads_stop = false;
+	this->workload.clear();
+	this->workload.append_array(this->meshes);
+	for (Thread &thread : this->threads) {
+		if (!thread.is_started()) {
+			thread.start(&Terrain::generate_meshes_thread, this);
+		}
+	}
+	do {
+		this->workload_lock.unlock();
+		Thread::yield();
+		this->workload_lock.lock();
+	} while (!this->workload.is_empty());
+	this->threads_stop = true;
+	this->workload_lock.unlock();
+	for (Thread &thread : this->threads) {
+		thread.wait_to_finish();
+	}
+	for (TerrainChunkMesh *mesh : this->dirty_meshes) {
+		mesh->apply_new_mesh();
+	}
+	this->dirty_meshes.clear();
+}
+
+void Terrain::_notification(int what) {
+	switch (what) {
+		default:
+			return;
+		case NOTIFICATION_ENTER_TREE:
+			if (!is_ready()) {
+				connect("child_order_changed", callable_mp(this, &self_type::child_order_changed));
+			}
+			return;
+		case NOTIFICATION_READY:
+			construct_chunk_grid();
+			synchronous_generate_terrain();
+			return;
+		case NOTIFICATION_PROCESS:
+			update_meshes();
+			update_threads();
+			return;
+		case NOTIFICATION_EXIT_TREE:
+			this->workload_lock.lock();
+			this->threads_stop = true;
+			this->workload_lock.unlock();
+			for (Thread &thread : this->threads) {
+				if (thread.is_started()) {
+					thread.wait_to_finish();
+				}
+			}
+			return;
+	}
+}
+
+void Terrain::generate_meshes_thread(void *terrain) {
+	Terrain *self{ static_cast<Terrain *>(terrain) };
+	print_line("thread", Thread::get_caller_id(), "start");
+	for (;;) {
+		self->workload_lock.lock();
+		if (self->threads_stop) {
+			self->workload_lock.unlock();
+			print_line(Thread::get_caller_id(), "exiting");
+			break;
+		}
+		if (self->workload.is_empty()) {
+			self->workload_lock.unlock();
+			Thread::yield();
+			continue;
+		}
+		TerrainChunkMesh *mesh{ self->workload[0] };
+		self->workload.remove_at(0);
+		self->workload_lock.unlock();
+		if (!mesh->is_inside_tree()) {
+			print_line(Thread::get_caller_id(), "mesh is outside tree, exiting");
+			break;
+		}
+		mesh->update_mesh();
+		Thread::yield();
+	}
+	print_line(Thread::get_caller_id(), "done");
+	return;
+}
+
+void Terrain::construct_chunk_grid() {
+	this->workload_lock.lock();
+	this->threads_stop = true;
+	this->workload_lock.unlock();
+	for (Thread &thread : this->threads) {
+		if (thread.is_started()) {
+			thread.wait_to_finish();
+		}
+	}
+	this->workload_lock.lock();
+	for (TerrainChunkMesh *mesh : this->meshes) {
+		remove_child(mesh);
+		mesh->queue_free();
+	}
+	size_t const chunks_per_side{ this->side_length / this->chunk_size };
+	Vector3 const origin{ (float)this->chunk_size / 2.f, 0.f, (float)this->chunk_size / 2.f };
+	this->meshes.clear();
+	this->workload.clear();
+	for (size_t y{ 0 }; y < chunks_per_side; ++y) {
+		for (size_t x{ 0 }; x < chunks_per_side; ++x) {
+			TerrainChunkMesh *chunk{ memnew(TerrainChunkMesh) };
+			chunk->set_size(this->chunk_size);
+			chunk->set_detail(this->detail);
+			chunk->set_terrain(this);
+			chunk->set_material_override(this->mesh_material);
+			chunk->set_position(origin + Vector3{ (float)this->chunk_size * (float)x, 0.f, (float)this->chunk_size * (float)y });
+			add_child(chunk);
+			chunk->set_owner(this);
+			this->meshes.push_back(chunk);
+			this->workload.push_back(chunk);
+		}
+	}
+	this->threads_stop = false;
+	this->dirty_meshes.clear();
+	this->workload_lock.unlock();
+	for (Thread &thread : this->threads) {
+		thread.start(&self_type::generate_meshes_thread, this);
+	}
+}
+
+float Terrain::height_at(Vector2 world_coordinate) {
+	float height{ 0 };
+	for (TerrainModifier *mod : this->modifiers) {
+		if (!mod->is_inside_tree()) {
+			return height;
+		}
+		height = mod->evaluate_at(world_coordinate, height);
+	}
+	return height;
+}
+
+void Terrain::push_changed(Rect2 area) {
+	for (TerrainChunkMesh *mesh : this->meshes) {
+		this->workload_lock.lock();
+		if (area.intersects(mesh->get_bounds()) && !this->workload.has(mesh)) {
+			workload.push_back(mesh);
+		}
+		this->workload_lock.unlock();
+	}
+}
+
+void Terrain::mesh_dirty(TerrainChunkMesh *mesh) {
+	this->dirty_meshes_lock.lock();
+	this->dirty_meshes.push_back(mesh);
+	callable_mp(cast_to<Node>(this), &self_type::set_process).call_deferred(true);
+	this->dirty_meshes_lock.unlock();
+}
+
+void Terrain::set_mesh_material(Ref<Material> material) {
+	this->mesh_material = material;
+	for (TerrainChunkMesh *mesh : this->meshes) {
+		mesh->set_material_override(material);
+	}
+}
+
+Ref<Material> Terrain::get_mesh_material() const {
+	return this->mesh_material;
+}
+
+void Terrain::set_side_length(size_t length) {
+	this->side_length = length;
+	if (is_inside_tree()) {
+		construct_chunk_grid();
+	}
+}
+
+size_t Terrain::get_side_length() const {
+	return this->side_length;
+}
+
+void Terrain::set_chunk_size(size_t size) {
+	this->chunk_size = size;
+	if (is_inside_tree()) {
+		construct_chunk_grid();
+	}
+}
+
+size_t Terrain::get_chunk_size() const {
+	return this->chunk_size;
+}
+
+void Terrain::set_detail(size_t detail) {
+	this->detail = detail;
+	if (is_inside_tree()) {
+		construct_chunk_grid();
+	}
+}
+
+size_t Terrain::get_detail() const {
+	return this->detail;
+}
+
+void Terrain::set_thread_count(size_t num) {
+	this->workload_lock.lock();
+	this->threads_stop = true;
+	this->workload_lock.unlock();
+	for (Thread &thread : this->threads) {
+		thread.wait_to_finish();
+	}
+	this->threads_stop = false;
+	this->threads.resize_initialized(num);
+	for (Thread &thread : this->threads) {
+		thread.start(&self_type::generate_meshes_thread, this);
+	}
+}
+
+size_t Terrain::get_thread_count() const {
+	return this->threads.size();
+}

modules/terrain/terrain.h

@@ -0,0 +1,58 @@
+#pragma once
+
+#include "core/math/rect2.h"
+#include "core/os/mutex.h"
+#include "core/os/thread.h"
+#include "core/templates/vector.h"
+#include "scene/main/node.h"
+#include "scene/resources/material.h"
+class TerrainChunkMesh;
+class TerrainModifier;
+
+class Terrain : public Node {
+	GDCLASS(Terrain, Node);
+	static void _bind_methods();
+	void child_order_changed();
+	void update_meshes();
+	void update_threads();
+	void synchronous_generate_terrain();
+
+protected:
+	void _notification(int what);
+	static void generate_meshes_thread(void *terrain);
+
+public:
+	void construct_chunk_grid();
+	float height_at(Vector2 world_coordinate);
+	void push_changed(Rect2 area);
+	void mesh_dirty(TerrainChunkMesh *mesh);
+
+private:
+	Ref<Material> mesh_material{};
+	Vector<TerrainChunkMesh *> workload{};
+	bool threads_stop{ false };
+	Mutex workload_lock;
+
+	Vector<TerrainChunkMesh *> dirty_meshes{};
+	Mutex dirty_meshes_lock{};
+
+	Vector<TerrainChunkMesh *> meshes{};
+	Vector<TerrainModifier *> modifiers{};
+	LocalVector<Thread> threads{};
+
+	size_t side_length{ 200 };
+	size_t chunk_size{ 50 };
+	size_t detail{ 1 };
+
+public:
+	void set_mesh_material(Ref<Material> material);
+	Ref<Material> get_mesh_material() const;
+	void set_side_length(size_t length);
+	size_t get_side_length() const;
+	void set_chunk_size(size_t size);
+	size_t get_chunk_size() const;
+	void set_detail(size_t detail);
+	size_t get_detail() const;
+	void set_thread_count(size_t num);
+	size_t get_thread_count() const;
+};

modules/terrain/terrain_chunk.cpp

@@ -0,0 +1,127 @@
+#include "terrain_chunk.h"
+#include "core/math/math_defs.h"
+#include "core/math/math_funcs.h"
+#include "core/variant/variant.h"
+#include "scene/3d/physics/collision_shape_3d.h"
+#include "scene/3d/physics/static_body_3d.h"
+#include "scene/resources/3d/height_map_shape_3d.h"
+#include "scene/resources/surface_tool.h"
+#include "terrain/terrain.h"
+
+void TerrainChunkMesh::_bind_methods() {}
+
+void TerrainChunkMesh::ready() {
+	this->position_buffer = get_global_position();
+	float const sizef{ (float)get_size() };
+	this->bounds.position = { this->position_buffer.x - sizef / 2.f, this->position_buffer.z - sizef / 2.f };
+	this->bounds.size = { sizef, sizef };
+
+	add_child(this->body = memnew(StaticBody3D));
+	ERR_FAIL_COND_EDMSG(this->body == nullptr, "Failed to instantiate StaticBody3D");
+	this->body->add_child(this->collider = memnew(CollisionShape3D));
+	this->body->set_owner(this);
+	ERR_FAIL_COND_EDMSG(this->collider == nullptr, "Failed to instantiate CollisionShape3D");
+	this->collider->set_owner(this);
+	this->shape = memnew(HeightMapShape3D);
+	ERR_FAIL_COND_EDMSG(!this->shape.is_valid(), "Failed to instantiate HeightMapShape3D");
+	this->collider->set_shape(this->shape);
+	this->shape->set_map_depth(heightmap_side_length());
+	this->shape->set_map_width(heightmap_side_length());
+}
+
+void TerrainChunkMesh::generate_vertices() {
+	ERR_FAIL_COND_EDMSG(this->terrain == nullptr, "TerrainChunkMesh::generate_vertices: no terrain assigned");
+	ERR_FAIL_COND_EDMSG(this->size <= 0.f, "TerrainChunkMesh::generate_vertices: size <= 0");
+	ERR_FAIL_COND_EDMSG(points_per_side() <= 0, "TerrainChunkMesh::generate_vertices: points per side <= 0");
+	float const half_extent{ (float)this->size / 2.f };
+	float const point_distance{ (float)this->size / ((float)points_per_side() - 1) };
+	Vector3 origin{ this->position_buffer - Vector3{ half_extent, 0, half_extent } };
+	for (size_t x{ 0 }; x < points_per_side(); ++x) {
+		for (size_t y{ 0 }; y < points_per_side(); ++y) {
+			Vector2 const coordinate{ origin.x + point_distance * x, origin.z + point_distance * y };
+			this->surface->set_uv({ (float)x / (float)points_per_side(), (float)y / (float)points_per_side() });
+			float height{ this->terrain->height_at(coordinate) };
+			this->surface->add_vertex({ coordinate.x - this->position_buffer.x, height, coordinate.y - this->position_buffer.z });
+		}
+	}
+	this->heightmap.resize_initialized(heightmap_side_length() * heightmap_side_length());
+	for (size_t x{ 0 }; x < heightmap_side_length(); x++) {
+		for (size_t y{ 0 }; y < heightmap_side_length(); y++) {
+			Vector2 coordinate{ origin.x + x, origin.z + y };
+			this->heightmap.set(x + y * heightmap_side_length(), this->terrain->height_at(coordinate));
+		}
+	}
+}
+
+void TerrainChunkMesh::generate_faces() {
+	LocalVector<SurfaceTool::Vertex> &verts{ this->surface->get_vertex_array() };
+	ERR_FAIL_COND_EDMSG(verts.size() == 0, "TerrainChunkMesh::generate_faces: no vertices in surface, call generate_vertices first");
+	size_t const faces_per_side{ points_per_side() - 1 };
+	for (size_t x{ 0 }; x < faces_per_side; ++x) {
+		for (size_t y{ 0 }; y < faces_per_side; ++y) {
+			size_t const tl{ x + y * points_per_side() };
+			float tl_br{ verts[tl].vertex.distance_to(verts[tl + points_per_side() + 1].vertex) };
+			float tr_bl{ verts[tl + 1].vertex.distance_to(verts[tl + points_per_side()].vertex) };
+			if (tl_br < tr_bl) {
+				surface->add_index(tl);
+				surface->add_index(tl + points_per_side() + 1);
+				surface->add_index(tl + 1);
+				surface->add_index(tl);
+				surface->add_index(tl + points_per_side());
+				surface->add_index(tl + points_per_side() + 1);
+			} else {
+				surface->add_index(tl + points_per_side());
+				surface->add_index(tl + points_per_side() + 1);
+				surface->add_index(tl + 1);
+				surface->add_index(tl + 1);
+				surface->add_index(tl);
+				surface->add_index(tl + points_per_side());
+			}
+		}
+	}
+}
+
+void TerrainChunkMesh::_notification(int what) {
+	switch (what) {
+		default:
+			return;
+		case NOTIFICATION_READY:
+			ready();
+			return;
+	}
+}
+
+void TerrainChunkMesh::apply_new_mesh() {
+	this->lock.lock();
+	set_mesh(this->new_mesh);
+	if (this->shape->get_map_depth() != heightmap_side_length() || this->shape->get_map_width() != heightmap_side_length()) {
+		this->shape->set_map_depth(heightmap_side_length());
+		this->shape->set_map_width(heightmap_side_length());
+	}
+	this->shape->set_map_data(heightmap);
+	this->lock.unlock();
+}
+
+void TerrainChunkMesh::update_mesh() {
+	ERR_FAIL_COND_EDMSG(this->size <= 0.f, "TerrainChunkMesh::generate: size <= 0");
+	ERR_FAIL_COND_EDMSG(points_per_side() <= 0, "TerrainChunkMesh::generate: points per side <= 0");
+	this->lock.lock();
+	this->surface = memnew(SurfaceTool);
+	this->surface->begin(Mesh::PRIMITIVE_TRIANGLES);
+	generate_vertices();
+	generate_faces();
+	this->surface->generate_normals();
+	this->surface->generate_tangents();
+	this->new_mesh = memnew(ArrayMesh);
+	this->surface->commit(this->new_mesh);
+	this->lock.unlock();
+	this->terrain->mesh_dirty(this);
+}
+
+size_t TerrainChunkMesh::points_per_side() const {
+	return this->size * this->detail;
+}
+
+int TerrainChunkMesh::heightmap_side_length() const {
+	return get_size() + 1;
+}

modules/terrain/terrain_chunk.h

@@ -0,0 +1,49 @@
+#pragma once
+
+#include "core/math/rect2.h"
+#include "macros.h"
+#include "scene/3d/mesh_instance_3d.h"
+#include "scene/3d/physics/collision_shape_3d.h"
+#include "scene/3d/physics/static_body_3d.h"
+#include "scene/resources/3d/height_map_shape_3d.h"
+#include "scene/resources/mesh.h"
+#include "scene/resources/surface_tool.h"
+class Terrain;
+
+class TerrainChunkMesh : public MeshInstance3D {
+	GDCLASS(TerrainChunkMesh, MeshInstance3D);
+	static void _bind_methods();
+	void ready();
+	void generate_vertices();
+	void generate_faces();
+
+protected:
+	void _notification(int what);
+
+public:
+	void apply_new_mesh();
+	void update_mesh();
+	size_t points_per_side() const;
+	int heightmap_side_length() const;
+
+private:
+	Mutex lock{};
+	Vector3 position_buffer{};
+	Ref<SurfaceTool> surface{};
+	Ref<ArrayMesh> new_mesh{};
+	Terrain *terrain{ nullptr };
+	size_t detail{ 1 };
+	size_t size{ 1 };
+	Rect2 bounds{};
+
+	Ref<HeightMapShape3D> shape{};
+	StaticBody3D *body{ nullptr };
+	CollisionShape3D *collider{ nullptr };
+	Vector<real_t> heightmap{};
+
+public:
+	GET_SET_FNS(Rect2, bounds);
+	GET_SET_FNS(Terrain *, terrain);
+	GET_SET_FNS(size_t, detail);
+	GET_SET_FNS(size_t, size);
+};

modules/terrain/terrain_modifier.cpp

@@ -0,0 +1,417 @@
+#include "terrain_modifier.h"
+#include "core/config/engine.h"
+#include "core/math/math_funcs.h"
+#include "core/variant/variant.h"
+#include "macros.h"
+#include "scene/main/node.h"
+#include "terrain/terrain.h"
+#include <algorithm>
+
+void TerrainModifier::_bind_methods() {}
+
+void TerrainModifier::_notification(int what) {
+	switch (what) {
+		default:
+			return;
+		case NOTIFICATION_ENTER_TREE:
+			if (Engine::get_singleton()->is_editor_hint()) {
+				set_notify_transform(true);
+			}
+			this->thread_safe_global_position = get_global_position();
+		case NOTIFICATION_TRANSFORM_CHANGED:
+			this->thread_safe_global_position = get_global_position();
+			return;
+	}
+}
+
+void TerrainModifier::push_changed(Rect2 area) {
+	if (this->terrain) {
+		this->terrain->push_changed(area);
+	}
+}
+
+float TerrainModifier::evaluate_at(Vector2 world_coordinate, float before) {
+	Vector3 const global_position{ get_thread_safe_global_position() };
+	return global_position.y;
+}
+
+void TerrainModifier::set_bounds(Rect2 bounds) {
+	if (this->bounds != bounds) {
+		push_changed(bounds);
+		push_changed(this->bounds);
+		this->bounds = bounds;
+	}
+}
+
+Rect2 TerrainModifier::get_bounds() const {
+	return this->bounds;
+}
+
+Vector3 TerrainModifier::get_thread_safe_global_position() const {
+	return this->thread_safe_global_position;
+}
+
+void SharedMutex::lock_shared() {
+	this->lock.lock();
+	this->shared_count++;
+	this->lock.unlock();
+}
+
+void SharedMutex::unlock_shared() {
+	this->lock.lock();
+	this->shared_count--;
+	this->lock.unlock();
+}
+
+void SharedMutex::lock_exclusive() {
+	while (true) {
+		this->lock.lock();
+		if (this->shared_count == 0) {
+			return;
+		}
+		this->lock.unlock();
+	}
+}
+
+void SharedMutex::unlock_exclusive() {
+	this->lock.unlock();
+}
+
+void TerrainModifierDistance::_bind_methods() {
+	BIND_HPROPERTY(Variant::OBJECT, distance_weight_curve, PROPERTY_HINT_RESOURCE_TYPE, "Curve");
+}
+
+void TerrainModifierDistance::curves_changed() {
+	if (!update_bounds()) {
+		push_changed(get_bounds());
+	}
+	this->lock.lock_exclusive();
+	this->distance_weight_curve_buffer = this->distance_weight_curve.is_valid() ? this->distance_weight_curve->duplicate(true) : nullptr;
+	this->lock.unlock_exclusive();
+}
+
+bool TerrainModifierDistance::update_bounds() {
+	Rect2 const before{ get_bounds() };
+	Rect2 bounds{};
+	Vector3 position{ get_thread_safe_global_position() };
+	bounds.position = { position.x, position.z };
+	bounds.size = { 0, 0 };
+	this->lock.lock_shared();
+	if (this->distance_weight_curve.is_valid()) {
+		float const max_radius{ this->distance_weight_curve->get_max_domain() };
+		float const max_diameter{ 2.f * max_radius };
+		bounds.size = { max_diameter, max_diameter };
+		bounds.position -= { max_radius, max_radius };
+	}
+	bool const changed{ before != bounds };
+	this->lock.unlock_shared();
+	this->lock.lock_exclusive();
+	set_bounds(bounds);
+	this->lock.unlock_exclusive();
+	return changed;
+}
+
+void TerrainModifierDistance::_notification(int what) {
+	switch (what) {
+		default:
+			return;
+		case NOTIFICATION_READY:
+			update_bounds();
+			set_notify_transform(true);
+			return;
+		case NOTIFICATION_TRANSFORM_CHANGED:
+			if (is_inside_tree()) {
+				if (!update_bounds()) {
+					push_changed(get_bounds());
+				}
+			}
+			return;
+	}
+}
+
+float TerrainModifierDistance::distance_at(Vector2 const &world_coordinate) {
+	Vector3 const global_position{ get_thread_safe_global_position() };
+	return world_coordinate.distance_to({ global_position.x, global_position.z });
+}
+
+float TerrainModifierDistance::evaluate_at(Vector2 world_coordinate, float before) {
+	this->lock.lock_shared();
+	if (this->distance_weight_curve_buffer.is_null()) {
+		this->lock.unlock_shared();
+		return before;
+	}
+	float const distance{ distance_at(world_coordinate) };
+	if (distance >= this->distance_weight_curve_buffer->get_max_domain()) {
+		this->lock.unlock_shared();
+		return before;
+	}
+	float const weight_offset{ std::clamp(distance, this->distance_weight_curve_buffer->get_min_domain(), this->distance_weight_curve_buffer->get_max_domain()) };
+	float const weight{ this->distance_weight_curve_buffer->sample(weight_offset) };
+	float out{ weight <= 0.f ? before : Math::lerp(before, get_thread_safe_global_position().y, weight) };
+	this->lock.unlock_shared();
+
+	return out;
+}
+
+PackedStringArray TerrainModifierDistance::get_configuration_warnings() const {
+	PackedStringArray warnings{ super_type::get_configuration_warnings() };
+	if (this->distance_weight_curve.is_null()) {
+		warnings.push_back("distance_weight_curve is invalid, add a valid distance_weight_curve");
+	}
+	return warnings;
+}
+
+void TerrainModifierDistance::set_distance_weight_curve(Ref<Curve> curve) {
+	this->lock.lock_exclusive();
+	if (Engine::get_singleton()->is_editor_hint()) {
+		if (this->distance_weight_curve.is_valid()) {
+			this->distance_weight_curve->disconnect_changed(callable_mp(this, &self_type::curves_changed));
+		}
+		if (curve.is_valid()) {
+			curve->connect_changed(callable_mp(this, &self_type::curves_changed));
+		}
+	}
+	this->distance_weight_curve = curve;
+	this->lock.unlock_exclusive();
+	curves_changed();
+	update_configuration_warnings();
+}
+
+Ref<Curve> TerrainModifierDistance::get_distance_weight_curve() const {
+	return this->distance_weight_curve;
+}
+
+void TerrainModifierPathPoint::_bind_methods() {}
+
+void TerrainModifierPathPoint::_notification(int what) {
+	switch (what) {
+		default:
+			return;
+		case NOTIFICATION_ENTER_TREE:
+			this->path = cast_to<TerrainModifierPath>(get_parent());
+			return;
+		case NOTIFICATION_READY:
+			set_notify_transform(true);
+			if (this->path) {
+				this->path->path_changed();
+			}
+			return;
+		case NOTIFICATION_TRANSFORM_CHANGED:
+			if (this->path && is_inside_tree()) {
+				this->path->path_changed();
+			}
+			return;
+		case NOTIFICATION_EXIT_TREE:
+			this->path = nullptr;
+			return;
+	}
+}
+
+void TerrainModifierPath::_bind_methods() {
+	BIND_HPROPERTY(Variant::OBJECT, curve_left, PROPERTY_HINT_RESOURCE_TYPE, "Curve");
+	BIND_HPROPERTY(Variant::OBJECT, curve_right, PROPERTY_HINT_RESOURCE_TYPE, "Curve");
+}
+
+void TerrainModifierPath::curves_changed() {
+	if (!update_bounds()) {
+		push_changed(get_bounds());
+	}
+	this->lock.lock_exclusive();
+	this->curve_left_buffer = this->curve_left.is_valid() ? this->curve_left->duplicate(true) : nullptr;
+	this->curve_right_buffer = this->curve_right.is_valid() ? this->curve_right->duplicate(true) : nullptr;
+	this->lock.unlock_exclusive();
+}
+
+bool TerrainModifierPath::update_bounds() {
+	Vector2 min{}, max{};
+	this->lock.lock_shared();
+	if (this->points.is_empty() || this->curve_left.is_null()) {
+		Vector3 point{ this->get_thread_safe_global_position() };
+		min.x = point.x;
+		min.y = point.z;
+		max = min;
+	} else {
+		max = min = { this->points[0].x, this->points[0].y };
+		for (Vector3 const &point : this->points) {
+			max.x = max.x > point.x ? max.x : point.x;
+			max.y = max.y > point.z ? max.y : point.z;
+			min.x = min.x < point.x ? min.x : point.x;
+			min.y = min.y < point.z ? min.y : point.z;
+		}
+		float max_distance_left{ this->curve_left->get_max_domain() };
+		float max_distance{ max_distance_left };
+		if (this->curve_right.is_valid()) {
+			float max_distance_right{ this->curve_right->get_max_domain() };
+			max_distance = max_distance_right > max_distance ? max_distance_right : max_distance;
+		}
+		min -= { max_distance, max_distance };
+		max += { max_distance * 2.f, max_distance * 2.f };
+	}
+	Rect2 bounds{ min, max - min };
+	bool const changed{ bounds != get_bounds() };
+	this->lock.unlock_shared();
+	this->lock.lock_exclusive();
+	set_bounds(bounds);
+	this->lock.unlock_exclusive();
+	return changed;
+}
+
+void TerrainModifierPath::_notification(int what) {
+	switch (what) {
+		default:
+			return;
+		case NOTIFICATION_READY:
+			update_bounds();
+			set_notify_transform(true);
+			return;
+		case NOTIFICATION_TRANSFORM_CHANGED:
+			if (is_inside_tree()) {
+				if (!update_bounds()) {
+					push_changed(get_bounds());
+				}
+			}
+			return;
+		case NOTIFICATION_CHILD_ORDER_CHANGED:
+			path_changed();
+			return;
+	}
+}
+
+float TerrainModifierPath::evaluate_line(Vector3 a, bool a_end, Vector3 b, bool b_end, Vector2 world_coordinate, float &out_dot, float &out_distance, float &out_percentage) {
+	Vector2 a2{ a.x, a.z }, b2{ b.x, b.z };
+	Vector2 const relative_coordinate{ world_coordinate - a2 };
+	Vector2 const difference2{ b2 - a2 };
+	float w{ difference2.normalized().dot(relative_coordinate) / difference2.length() };
+	Vector3 const difference{ b - a };
+	Vector3 const closest_on_line{ a + difference * (w > 0 ? (w < 1 ? w : 1) : 0) };
+	Vector2 const right{ -difference.z, difference.x };
+	out_dot = right.normalized().dot(relative_coordinate);
+	out_distance = world_coordinate.distance_to({ closest_on_line.x, closest_on_line.z });
+	out_percentage = w;
+	return a.y + (b.y - a.y) * w;
+}
+
+float TerrainModifierPath::evaluate_at(Vector2 world_coordinate, float before) {
+	this->lock.lock_shared();
+	if (this->curve_left_buffer.is_null() || this->points.size() <= 1) {
+		this->lock.unlock_shared();
+		return before;
+	}
+	Ref<Curve> right_curve{ this->curve_right_buffer };
+	if (right_curve.is_null()) {
+		right_curve = this->curve_left_buffer;
+	}
+	float out_height{ before };
+	long const count{ this->closed ? this->points.size() : this->points.size() - 1 };
+	for (int i{ 0 }; i < count; i++) {
+		Vector3 const ipos{ this->points[i] };
+		Vector3 const next_pos{ this->points[Math::wrapi(i + 1, 0, this->points.size())] };
+		if (ipos == next_pos) {
+			continue;
+		}
+		float dot, distance, percentage;
+		bool const is_start{ !this->closed && i == 0 }, is_end{ !this->closed && i == count - 1 };
+		float height{ evaluate_line(ipos, is_start, next_pos, is_end, world_coordinate, dot, distance, percentage) };
+		float const left{ this->curve_left_buffer->sample(distance) };
+		float const right{ right_curve->sample(distance) };
+		float const ndot{ dot / distance };
+		float separation{ ndot / 2.f + 0.5f };
+		if (percentage > 0.f && percentage < 1.f) {
+			separation = Math::round(separation);
+		}
+		float const weight{ left * (1.f - separation) + right * separation };
+		float const blended_height{ Math::lerp(out_height, height, weight) };
+		out_height = blended_height;
+	}
+	this->lock.unlock_shared();
+	return out_height;
+}
+
+void TerrainModifierPath::path_changed() {
+	if (!is_inside_tree()) {
+		return;
+	}
+	this->lock.lock_exclusive();
+	this->points.clear();
+	this->min_height = INFINITY;
+	this->max_height = -INFINITY;
+	Vector3 last{ INFINITY, INFINITY, INFINITY };
+	for (Variant var : get_children()) {
+		if (TerrainModifierPathPoint * point{ cast_to<TerrainModifierPathPoint>(var) }) {
+			Vector3 position{ point->get_global_position() };
+			if (position != last) {
+				this->points.push_back(position);
+				if (position.y > this->max_height) {
+					this->max_height = position.y;
+				}
+				if (position.y < this->min_height) {
+					this->min_height = position.y;
+				}
+			}
+		}
+		last = var;
+	}
+	this->lock.unlock_exclusive();
+	if (!update_bounds()) {
+		push_changed(get_bounds());
+	}
+}
+
+PackedStringArray TerrainModifierPath::get_configuration_warnings() const {
+	PackedStringArray warnings{ super_type::get_configuration_warnings() };
+	if (this->curve_left.is_null()) {
+		warnings.push_back("curve_left is invalid, add a valid curve_left");
+	}
+	return warnings;
+}
+
+void TerrainModifierPath::set_curve_left(Ref<Curve> curve) {
+	this->lock.lock_exclusive();
+	if (curve.is_valid() && curve == this->curve_right) {
+		curve = curve->duplicate();
+	}
+	if (Engine::get_singleton()->is_editor_hint()) {
+		if (this->curve_left.is_valid()) {
+			this->curve_left->disconnect_changed(callable_mp(this, &self_type::curves_changed));
+		}
+		if (curve.is_valid()) {
+			curve->connect_changed(callable_mp(this, &self_type::curves_changed));
+		}
+	}
+	this->curve_left = curve;
+	this->lock.unlock_exclusive();
+	if (!curve.is_valid() && this->curve_right.is_valid()) {
+		curve = this->curve_right;
+		set_curve_right(nullptr);
+	} else {
+		curves_changed();
+		update_configuration_warnings();
+	}
+}
+
+Ref<Curve> TerrainModifierPath::get_curve_left() const {
+	return this->curve_left;
+}
+
+void TerrainModifierPath::set_curve_right(Ref<Curve> curve) {
+	this->lock.lock_exclusive();
+	if (curve.is_valid() && curve == this->curve_left) {
+		curve = curve->duplicate();
+	}
+	if (Engine::get_singleton()->is_editor_hint()) {
+		if (this->curve_right.is_valid()) {
+			this->curve_right->disconnect_changed(callable_mp(this, &self_type::curves_changed));
+		}
+		if (curve.is_valid()) {
+			curve->connect_changed(callable_mp(this, &self_type::curves_changed));
+		}
+	}
+	this->curve_right = curve;
+	this->lock.unlock_exclusive();
+	curves_changed();
+	update_configuration_warnings();
+}
+
+Ref<Curve> TerrainModifierPath::get_curve_right() const {
+	return this->curve_right;
+}

modules/terrain/terrain_modifier.h

@@ -0,0 +1,113 @@
+#pragma once
+
+#include "core/object/object.h"
+#include "core/variant/variant.h"
+#include "macros.h"
+#include "scene/3d/marker_3d.h"
+#include "scene/resources/curve.h"
+#include <cmath>
+class Terrain;
+
+class TerrainModifier : public Marker3D {
+	GDCLASS(TerrainModifier, Marker3D);
+	static void _bind_methods();
+
+protected:
+	void _notification(int what);
+	void push_changed(Rect2 bounds);
+
+public:
+	virtual float evaluate_at(Vector2 world_coordinate, float before);
+
+private:
+	Vector3 thread_safe_global_position{};
+	Terrain *terrain{ nullptr };
+	Rect2 bounds{ { -INFINITY, -INFINITY }, { INFINITY, INFINITY } };
+
+protected:
+	void set_bounds(Rect2 bounds);
+	Rect2 get_bounds() const;
+
+public:
+	Vector3 get_thread_safe_global_position() const;
+	GET_SET_FNS(Terrain *, terrain);
+};
+
+struct SharedMutex {
+	void lock_shared();
+	void unlock_shared();
+	void lock_exclusive();
+	void unlock_exclusive();
+
+private:
+	Mutex lock{};
+	int shared_count{};
+};
+
+class TerrainModifierDistance : public TerrainModifier {
+	GDCLASS(TerrainModifierDistance, TerrainModifier);
+	static void _bind_methods();
+	void curves_changed();
+	bool update_bounds();
+
+protected:
+	void _notification(int what);
+	float distance_at(Vector2 const &world_coordinate);
+
+public:
+	float evaluate_at(Vector2 world_coordinate, float before) override;
+	PackedStringArray get_configuration_warnings() const override;
+
+private:
+	SharedMutex lock{};
+	Ref<Curve> distance_weight_curve{};
+	Ref<Curve> distance_weight_curve_buffer{};
+
+public:
+	void set_distance_weight_curve(Ref<Curve> curve);
+	Ref<Curve> get_distance_weight_curve() const;
+};
+
+class TerrainModifierPathPoint : public Marker3D {
+	GDCLASS(TerrainModifierPathPoint, Marker3D);
+	static void _bind_methods();
+
+protected:
+	void _notification(int what);
+
+public:
+	class TerrainModifierPath *path{ nullptr };
+};
+
+class TerrainModifierPath : public TerrainModifier {
+	GDCLASS(TerrainModifierPath, TerrainModifier);
+	static void _bind_methods();
+	void curves_changed();
+	bool update_bounds();
+
+protected:
+	void _notification(int what);
+	float evaluate_line(Vector3 a, bool a_end, Vector3 b, bool b_end, Vector2 world_coordinate, float &out_dot, float &out_distance, float &out_percentage);
+
+public:
+	float evaluate_at(Vector2 world_coordinate, float before) override;
+	void path_changed();
+	PackedStringArray get_configuration_warnings() const override;
+
+private:
+	SharedMutex lock{};
+	float min_height{};
+	float max_height{};
+	bool closed{ false };
+	Vector<Vector3> points{};
+	Ref<Curve> curve_left_buffer{};
+	Ref<Curve> curve_left{};
+	Ref<Curve> curve_right_buffer{};
+	Ref<Curve> curve_right{};
+
+public:
+	void set_curve_left(Ref<Curve> curve);
+	Ref<Curve> get_curve_left() const;
+	void set_curve_right(Ref<Curve> curve);
+	Ref<Curve> get_curve_right() const;
+};

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+specular_mode = 2
+vertex_color_use_as_albedo = true
+albedo_color = Color(0.121152334, 0.121152334, 0.121152334, 1)
+grow = true
+grow_amount = 0.015
+proximity_fade_enabled = true
+proximity_fade_distance = 0.15
+stencil_outline_thickness = 0.029

project/assets/style/model_importer.gd

@@ -0,0 +1,36 @@
+@tool
+extends EditorScenePostImport
+
+var regular_outline_material : StandardMaterial3D
+var detail_outline_material : StandardMaterial3D
+var thin_outline_material : StandardMaterial3D
+
+func _post_import(root : Node):
+	regular_outline_material = ResourceLoader.load("res://assets/style/base_outline_material.tres") as StandardMaterial3D
+	detail_outline_material = ResourceLoader.load("res://assets/style/detail_outline_material.tres") as StandardMaterial3D
+	thin_outline_material = ResourceLoader.load("res://assets/style/thin_outline_material.tres") as StandardMaterial3D
+	apply_outline_recursive(root)
+	return root
+
+func get_flag(node : Node, flag : String) -> bool:
+	if node.name.contains(flag):
+		node.name = node.name.erase(node.name.find(flag), flag.length())
+		return true
+	else:
+		return false
+
+func apply_outline_recursive(node : Node):
+	if node != null:
+		var outline : bool = not get_flag(node, "-nooutline")
+		if outline and node is MeshInstance3D:
+			var detail : bool = get_flag(node, "-detailoutline")
+			var thin : bool = get_flag(node, "-thinoutline")
+			var mesh : MeshInstance3D = (node as MeshInstance3D)
+			if detail and detail_outline_material:
+				mesh.material_overlay = detail_outline_material
+			elif thin and thin_outline_material:
+				mesh.material_overlay = thin_outline_material
+			elif regular_outline_material:
+				mesh.material_overlay = regular_outline_material
+		for child in node.get_children():
+			apply_outline_recursive(child)