feat: added simple enemy with chase behaviour

godot/Enemies/enemy.tscn

@@ -0,0 +1,46 @@
+[gd_scene load_steps=6 format=3 uid="uid://deb8qiasxsobt"]
+
+[sub_resource type="SphereShape3D" id="SphereShape3D_tnc8b"]
+radius = 7.23
+
+[sub_resource type="SphereShape3D" id="SphereShape3D_1inhn"]
+
+[sub_resource type="StandardMaterial3D" id="StandardMaterial3D_y3cyo"]
+albedo_color = Color(0.0666667, 0.223529, 0.254902, 1)
+
+[sub_resource type="BoxMesh" id="BoxMesh_y311e"]
+material = SubResource("StandardMaterial3D_y3cyo")
+size = Vector3(0.77, 0.59, 0.805)
+
+[sub_resource type="BoxMesh" id="BoxMesh_bc6co"]
+material = SubResource("StandardMaterial3D_y3cyo")
+size = Vector3(0.475, 0.495, 0.47)
+
+[node name="Enemy" type="Enemy"]
+collision_layer = 7
+
+[node name="NavigationAgent3D" type="NavigationAgent3D" parent="."]
+path_desired_distance = 2.25
+
+[node name="VisionArea" type="Area3D" parent="."]
+collision_layer = 0
+collision_mask = 2
+
+[node name="CollisionShape3D" type="CollisionShape3D" parent="VisionArea"]
+transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0.32109, 0)
+shape = SubResource("SphereShape3D_tnc8b")
+
+[node name="CollisionShape3D" type="CollisionShape3D" parent="."]
+transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0.495191, 0)
+shape = SubResource("SphereShape3D_1inhn")
+
+[node name="Health" type="Health" parent="."]
+max_health = 10
+
+[node name="MeshInstance3D" type="MeshInstance3D" parent="."]
+transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0.445159, -0.0811542)
+mesh = SubResource("BoxMesh_y311e")
+
+[node name="MeshInstance3D2" type="MeshInstance3D" parent="."]
+transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0.430494, 0.458904)
+mesh = SubResource("BoxMesh_bc6co")

godot/player.tscn

@@ -1,7 +1,7 @@
 [gd_scene load_steps=3 format=3 uid="uid://cqkbxe758jr7p"]
 
 [sub_resource type="Curve" id="Curve_bxjan"]
-_data = [Vector2(0, 0), 0.0, 0.0628674, 0, 0, Vector2(0.51626, 0.549451), 2.7033, 2.7033, 0, 0, Vector2(1, 1), 0.0, 0.0, 0, 0]
+_data = [Vector2(0, 0), 0.0, 3.33407, 0, 0, Vector2(0.430894, 0.692308), 0.730621, 0.730621, 0, 0, Vector2(1, 1), 0.0, 0.0, 0, 0]
 point_count = 3
 
 [sub_resource type="SphereMesh" id="SphereMesh_jkn5p"]

godot/player_character.tscn

@@ -1,4 +1,4 @@
-[gd_scene load_steps=5 format=3 uid="uid://dpda341t6ipiv"]
+[gd_scene load_steps=6 format=3 uid="uid://dpda341t6ipiv"]
 
 [sub_resource type="Curve" id="Curve_7rmf4"]
 min_value = 0.2
@@ -12,11 +12,18 @@ height = 1.59321
 [sub_resource type="CapsuleMesh" id="CapsuleMesh_rwcvu"]
 height = 1.605
 
+[sub_resource type="StandardMaterial3D" id="StandardMaterial3D_scmx3"]
+albedo_color = Color(0.94902, 0.909804, 0, 1)
+
 [sub_resource type="BoxMesh" id="BoxMesh_f5yvh"]
 size = Vector3(0.125, 0.14, 0.94)
 
 [node name="PlayerCharacter" type="PlayerCharacter"]
 rotation_speed_curve = SubResource("Curve_7rmf4")
+collision_layer = 7
+
+[node name="Health" type="Health" parent="."]
+max_health = 5
 
 [node name="CollisionShape3D" type="CollisionShape3D" parent="."]
 transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0.802835, 0)
@@ -27,7 +34,9 @@ shape = SubResource("CapsuleShape3D_3g72p")
 [node name="MeshInstance3D" type="MeshInstance3D" parent="."]
 transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0.8121, 0)
 mesh = SubResource("CapsuleMesh_rwcvu")
+surface_material_override/0 = SubResource("StandardMaterial3D_scmx3")
 
 [node name="MeshInstance3D2" type="MeshInstance3D" parent="."]
 transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, -0.509142, 0.986876, 0.380722)
 mesh = SubResource("BoxMesh_f5yvh")
+surface_material_override/0 = SubResource("StandardMaterial3D_scmx3")

godot/project.godot

@@ -37,3 +37,9 @@ move_backward={
 "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,"echo":false,"script":null)
 ]
 }
+
+[layer_names]
+
+3d_physics/layer_1="Default"
+3d_physics/layer_2="Vision"
+3d_physics/layer_3="Hitboxes"

godot/test_level.tscn

@@ -1,6 +1,7 @@
-[gd_scene load_steps=9 format=3 uid="uid://m36guasmi3c1"]
+[gd_scene load_steps=11 format=3 uid="uid://m36guasmi3c1"]
 
 [ext_resource type="PackedScene" uid="uid://cqkbxe758jr7p" path="res://player.tscn" id="1_hv5rj"]
+[ext_resource type="PackedScene" uid="uid://deb8qiasxsobt" path="res://Enemies/enemy.tscn" id="2_10wh5"]
 
 [sub_resource type="GameState" id="GameState_k4j3x"]
 
@@ -17,6 +18,10 @@ sky_material = SubResource("ProceduralSkyMaterial_s4k5k")
 background_mode = 2
 sky = SubResource("Sky_oquga")
 
+[sub_resource type="NavigationMesh" id="NavigationMesh_gx4lq"]
+vertices = PackedVector3Array(-9.5, 0.625, -9.5, -9.5, 0.625, 9.5, 9.5, 0.625, 9.5, 9.5, 0.625, -9.5)
+polygons = [PackedInt32Array(3, 2, 0), PackedInt32Array(0, 2, 1)]
+
 [sub_resource type="BoxMesh" id="BoxMesh_5glbk"]
 size = Vector3(20, 0.25, 20)
 
@@ -29,14 +34,20 @@ game_mode_prototype = SubResource("TunnelsGameMode_itn7y")
 [node name="WorldEnvironment" type="WorldEnvironment" parent="."]
 environment = SubResource("Environment_mt2l0")
 
-[node name="MeshInstance3D" type="MeshInstance3D" parent="WorldEnvironment"]
+[node name="NavigationRegion3D" type="NavigationRegion3D" parent="WorldEnvironment"]
+navigation_mesh = SubResource("NavigationMesh_gx4lq")
+
+[node name="MeshInstance3D" type="MeshInstance3D" parent="WorldEnvironment/NavigationRegion3D"]
 mesh = SubResource("BoxMesh_5glbk")
-skeleton = NodePath("../..")
+skeleton = NodePath("../../..")
 
-[node name="StaticBody3D" type="StaticBody3D" parent="WorldEnvironment"]
+[node name="StaticBody3D" type="StaticBody3D" parent="WorldEnvironment/NavigationRegion3D/MeshInstance3D"]
 
-[node name="CollisionShape3D" type="CollisionShape3D" parent="WorldEnvironment/StaticBody3D"]
+[node name="CollisionShape3D" type="CollisionShape3D" parent="WorldEnvironment/NavigationRegion3D/MeshInstance3D/StaticBody3D"]
 shape = SubResource("BoxShape3D_kacqg")
 
 [node name="DirectionalLight3D" type="DirectionalLight3D" parent="WorldEnvironment"]
 transform = Transform3D(0.581243, 0.357328, -0.731077, 0, 0.898426, 0.439124, 0.81373, -0.255238, 0.522204, 0, 2.44259, 0)
+
+[node name="Enemy" parent="." instance=ExtResource("2_10wh5")]
+transform = Transform3D(-0.925514, 0, -0.378713, 0, 1, 0, 0.378713, 0, -0.925514, -3.91746, 0.125, 5.6328)

src/enemy.cpp

@@ -0,0 +1,69 @@
+#include "enemy.hpp"
+#include "godot_cpp/classes/time.hpp"
+#include "godot_cpp/variant/utility_functions.hpp"
+#include "health.hpp"
+#include "player_character.hpp"
+#include "utils/godot_macros.h"
+#include <godot_cpp/classes/navigation_agent3d.hpp>
+
+namespace godot {
+void Enemy::_bind_methods() {
+#define CLASSNAME Enemy
+    GDFUNCTION_ARGS(body_entered_vision_area, "body");
+}
+
+void Enemy::_ready() { GDGAMEONLY();
+    this->health = this->get_node<Health>("Health");
+    this->nav_agent = this->get_node<NavigationAgent3D>("NavigationAgent3D");
+    this->vision_area = this->get_node<Area3D>("VisionArea");
+    this->vision_area->connect("body_entered", Callable(this, "body_entered_vision_area"));
+    this->update_navigation_target();
+}
+
+void Enemy::_process(double delta_time) { GDGAMEONLY();
+    if(this->renav_time > Time::get_singleton()->get_ticks_msec() / 1000.f) {
+        this->update_navigation_target();
+    }
+    this->process_navigation(delta_time);
+    this->move_and_slide();
+}
+
+void Enemy::process_navigation(double delta_time) {
+    if(this->nav_agent->is_navigation_finished()) {
+        return;
+    }
+    Vector3 const desired_direction = (this->nav_agent->get_next_path_position() - this->get_global_position()).normalized();
+    this->set_velocity(desired_direction);
+    Transform3D trans = this->get_global_transform();
+    Vector3 const forward = desired_direction;
+    trans.set_basis(Basis{desired_direction.cross(Vector3{0.f, 1.f, 0.f}), Vector3{0.f, 1.f, 0.f}, forward});
+    this->set_global_transform(trans);
+}
+
+void Enemy::body_entered_vision_area(Node3D *body) {
+    PlayerCharacter *player = Object::cast_to<PlayerCharacter>(body);
+    if(player == nullptr)
+        return;
+    // TODO: replace this with some condition deciding wether to attack the new character or the current target
+    this->target_player = player;
+    this->update_navigation_target();
+}
+
+void Enemy::update_navigation_target() {
+    this->renav_time = float(Time::get_singleton()->get_ticks_msec()) / 1000.f + Enemy::RENAV_INTERVAL;
+    if(this->target_player == nullptr)
+        this->nav_agent->set_target_position(this->get_global_position());
+    else
+        this->nav_agent->set_target_position(this->target_player->get_global_position());
+}
+
+Health *Enemy::get_health() {
+    return this->health;
+}
+
+Health const *Enemy::get_health() const {
+    return this->health;
+}
+
+float const Enemy::RENAV_INTERVAL{0.25f};
+}

src/enemy.hpp

@@ -0,0 +1,40 @@
+#ifndef ENEMY_HPP
+#define ENEMY_HPP
+
+#include "godot_cpp/classes/area3d.hpp"
+#include "health.hpp"
+#include <godot_cpp/classes/character_body3d.hpp>
+
+namespace godot {
+class PlayerCharacter;
+class NavigationAgent3D;
+
+class Enemy : public CharacterBody3D,
+              public IHealthEntity {
+    GDCLASS(Enemy, CharacterBody3D);
+    static void _bind_methods();
+public:
+    virtual void _ready() override;
+    virtual void _process(double delta_time) override;
+    void process_navigation(double delta_time);
+
+    void body_entered_vision_area(Node3D *body);
+
+    void update_navigation_target();
+
+    virtual Health *get_health() override;
+    virtual Health const *get_health() const override;
+
+private:
+    float renav_time{0.f};
+
+    PlayerCharacter *target_player{nullptr};
+    Health *health{nullptr};
+    NavigationAgent3D *nav_agent{nullptr};
+    Area3D *vision_area{nullptr};
+
+    static float const RENAV_INTERVAL;
+};
+}
+
+#endif // !ENEMY_HPP

src/register_types.cpp

@@ -9,6 +9,7 @@
 #include "utils/level.hpp"
 #include "utils/player_input.hpp"
 #include "utils/spawn_point.hpp"
+#include "enemy.hpp"
 #include "health.hpp"
 #include "player_character.hpp"
 #include "tunnels_game_mode.hpp"
@@ -22,16 +23,18 @@ void initialize_gdextension_types(ModuleInitializationLevel p_level)
         return;
     }
     ClassDB::register_abstract_class<GameRoot>();
-    ClassDB::register_class<GameRoot3D>();
-    ClassDB::register_class<SpawnPoint3D>();
-    ClassDB::register_class<PlayerInput>();
     ClassDB::register_class<GameMode>();
+    ClassDB::register_class<GameRoot3D>();
     ClassDB::register_class<GameState>();
     ClassDB::register_class<Level3D>();
+    ClassDB::register_class<PlayerInput>();
+    ClassDB::register_class<SpawnPoint3D>();
+
+    ClassDB::register_class<Enemy>();
+    ClassDB::register_class<Health>();
+    ClassDB::register_class<PlayerCharacter>();
     ClassDB::register_class<TunnelsGameMode>();
     ClassDB::register_class<TunnelsPlayer>();
-    ClassDB::register_class<PlayerCharacter>();
-    ClassDB::register_class<Health>();
 }
 
 extern "C"

src/tunnels_player.cpp

@@ -68,7 +68,7 @@ void TunnelsPlayer::process_mouse_location(double delta_time) {
 
 void TunnelsPlayer::process_camera_rotation(double delta_time) {
     Vector3 rotation = this->get_global_rotation();
-    float const y_multiplier = std::max(0.4f, this->mouse_location.y); // the influence of the mouse's y position on the rotation speed
+    float const y_multiplier = std::max(TunnelsPlayer::ROTATION_Y_MIN_INFLUENCE, this->mouse_location.y); // the influence of the mouse's y position on the rotation speed
     // rotate the camera when the mouse is close to the edge of the screen
     if(this->mouse_location.x < TunnelsPlayer::ROTATION_MARGIN) {
         // normalized measurement of how far into the rotation margin the mouse is
@@ -156,6 +156,7 @@ Ref<Curve> TunnelsPlayer::get_camera_rotation_ramp() const {
     return this->camera_rotation_ramp;
 }
 
-float const TunnelsPlayer::ROTATION_SPEED{4.f};
+float const TunnelsPlayer::ROTATION_SPEED{6.f};
-float const TunnelsPlayer::ROTATION_MARGIN{0.35f};
+float const TunnelsPlayer::ROTATION_Y_MIN_INFLUENCE{7.f};
+float const TunnelsPlayer::ROTATION_MARGIN{0.4f};
 }

src/tunnels_player.hpp

@@ -53,7 +53,9 @@ private:
     Camera3D *camera{nullptr};
 
     Ref<Curve> camera_rotation_ramp{};
+
     static float const ROTATION_SPEED;
+    static float const ROTATION_Y_MIN_INFLUENCE;
     static float const ROTATION_MARGIN;
 };
 }