feat: added player body class

modules/viscosity/player_body.cpp

@@ -0,0 +1,51 @@
+#include "player_body.h"
+#include "core/input/input.h"
+#include "scene/main/viewport.h"
+
+void PlayerBody::update_movement() {
+	Vector3 velocity{ get_velocity() };
+	Vector3 world_input{ world_move_input().normalized() };
+	velocity.x = world_input.x;
+	velocity.z = world_input.z;
+	velocity += get_gravity() * get_physics_process_delta_time();
+	set_velocity(velocity);
+	move_and_slide();
+}
+
+void PlayerBody::_notification(int what) {
+	if (Engine::get_singleton()->is_editor_hint()) {
+		return;
+	}
+	switch (what) {
+		default:
+			return;
+		case NOTIFICATION_ENTER_TREE:
+			set_physics_process(true);
+			set_process_unhandled_input(true);
+			break;
+		case NOTIFICATION_PHYSICS_PROCESS:
+			update_movement();
+			return;
+	}
+}
+
+void PlayerBody::unhandled_input(Ref<InputEvent> const &event) {
+	if (event->is_action("move_left") || event->is_action("move_right")) {
+		this->move_input.x = Input::get_singleton()->get_axis("move_left", "move_right");
+	}
+	if (event->is_action("move_forward") || event->is_action("move_backward")) {
+		this->move_input.y = Input::get_singleton()->get_axis("move_backward", "move_forward");
+	}
+}
+
+Vector3 PlayerBody::world_move_input() const {
+	Basis const basis{ get_viewport()->get_camera_3d()->get_global_basis() };
+	Vector3 left{ basis.get_column(0) };
+	left.y = 0.f;
+	Vector3 forward{ -basis.get_column(2) };
+	forward.y = 0.f;
+	return {
+		left.normalized() * this->move_input.x +
+		forward.normalized() * this->move_input.y
+	};
+}

modules/viscosity/player_body.h

@@ -0,0 +1,19 @@
+#pragma once
+
+#include "scene/3d/physics/character_body_3d.h"
+
+class PlayerBody : CharacterBody3D {
+	GDCLASS(PlayerBody, CharacterBody3D);
+	static void _bind_methods() {}
+	void update_movement();
+
+protected:
+	void _notification(int what);
+	void unhandled_input(Ref<InputEvent> const &event) override;
+	Vector3 world_move_input() const;
+
+private:
+	float run_speed{ 5.f };
+	float run_acceleration{ 5.f };
+	Vector2 move_input{ 0, 0 };
+};

modules/viscosity/register_types.cpp

@@ -1,11 +1,13 @@
 #include "register_types.h"
 
 #include "core/object/class_db.h"
+#include "player_body.h"
 
 void initialize_viscosity_module(ModuleInitializationLevel p_level) {
 	if (p_level != MODULE_INITIALIZATION_LEVEL_SCENE) {
 		return;
 	}
+	ClassDB::register_class<PlayerBody>();
 }
 
 void uninitialize_viscosity_module(ModuleInitializationLevel p_level) {