stick pens on walls

src/client/Bullet.cpp

@@ -0,0 +1,56 @@
+#include <client/Bullet.h>
+
+#include <godot_cpp/classes/engine.hpp>
+#include <godot_cpp/classes/physics_direct_space_state3d.hpp>
+#include <godot_cpp/classes/physics_ray_query_parameters3d.hpp>
+#include <godot_cpp/classes/world3d.hpp>
+#include <godot_cpp/variant/utility_functions.hpp>
+
+namespace blitz {
+
+using namespace godot;
+
+static constexpr float SPEED = 20.0f;
+static constexpr float MaxAlive = 10.0f;
+
+void Bullet::_bind_methods() {}
+
+Bullet::Bullet() : m_Stuck(false) {}
+
+void Bullet::_ready() {}
+
+Bullet::~Bullet() {}
+
+void Bullet::_process(float a_Delta) {
+	if (Engine::get_singleton()->is_editor_hint()) {
+		return;
+	}
+
+	m_LifeTime += a_Delta;
+	if (m_LifeTime > MaxAlive) {
+		queue_free();
+		return;
+	}
+
+	if (m_Stuck)
+		return;
+
+	Vector3 start = get_position();
+	Vector3 finish = start + get_transform().basis.xform(Vector3{0, 0, -SPEED * a_Delta});
+
+	auto query = PhysicsRayQueryParameters3D::create(start, finish, 1);
+	auto result = get_world_3d()->get_direct_space_state()->intersect_ray(query);
+
+	if (result.is_empty()) {
+		set_position(finish);
+		return;
+	}
+
+	m_Stuck = true;
+	Vector3 intersectPoint = result["position"];
+
+	auto* head = get_node<Node3D>("Armature");
+	head->set_global_position(intersectPoint);
+}
+
+}  // namespace blitz

src/client/register_types.cpp

@@ -1,4 +1,5 @@
 #include <blitz/godot/NetworkInterface.h>
+#include <client/Bullet.h>
 #include <client/ClientWorld.h>
 #include <client/FirstPersonPlayer.h>
 #include <client/Main.h>
@@ -23,6 +24,7 @@ static void RegisterClasses() {
 	GDREGISTER_ABSTRACT_CLASS(blitz::World);
 	GDREGISTER_CLASS(blitz::ClientWorld);
 	GDREGISTER_CLASS(blitz::ServerWorld);
+	GDREGISTER_CLASS(blitz::Bullet);
 }
 
 static void initialize_blitz_module(ModuleInitializationLevel p_level) {