I segfault, I don't know why, it doesn't even matter how hard you try

src/main.cpp

@@ -46,7 +46,6 @@ int main(int argc, char *argv[])
 
 	// World init
 	dxd::sim::World world = dxd::sim::World({ .x = 10, .y = 10 });
-	world.add_obj(new dxd::sim::Aircraft({ 0, 0 }, 1, 5));
 	world.add_obj(new dxd::sim::AFSpawner());
 
 	SDL_Event event;

src/renderer.hpp

@@ -94,7 +94,7 @@ public:
 
 	void diamond(vec2 center, float size)
 	{
-		size *= sqrtf(2);
+		size *= M_SQRT2f;
 		SDL_FPoint points[5];
 		vec2 p;
 

src/sim/af_spawner.cpp

@@ -2,12 +2,10 @@
 
 void dxd::sim::AFSpawner::tick(float timestep, World *world)
 {
-	++_cur_tick;
+	if (_next_spawn-- == 0)
-
-	if (_cur_tick < _next_spawn)
 		return;
 
-	_next_spawn = _cur_tick + 60 + SDL_rand(120);
+	_next_spawn = 60 + SDL_rand(120);
 
 	//Pos should spawn in a grid, check if free, and offset random from grid coord to look natural
 	vec2 pos = {(SDL_randf()-.5f)*2*60.0f, (SDL_randf()-.5f)*2*60.0f};

src/sim/af_spawner.hpp

@@ -13,14 +13,13 @@ class AFSpawner : public WorldObject
 {
 private:
 	std::vector<Airfield*> _airfields;
-	int _cur_tick;
 	int _next_spawn;
 
 public:
 	AFSpawner()
 	{
 		_airfields = std::vector<Airfield*>();
-		_cur_tick = _next_spawn = 0;
+		_next_spawn = 0;
 	}
 
 	void tick(float timestep, World *world) override;

src/sim/airfield.cpp

@@ -1,9 +1,20 @@
 #include "airfield.hpp"
+#include "aircraft.hpp"
 
 void dxd::sim::Airfield::tick(float timestep, World *world)
 {
 	if (--_ttl == 0)
-		world->remove_obj(this);
+	{
+		//world->remove_obj(this);
+		return;
+	}
+
+	if (--_next_spawn == 0)
+	{
+		Aircraft *af = new Aircraft(_position, SDL_randf() * M_PIf, 5.0f);
+		world->add_obj(af);
+		_next_spawn = 60 + SDL_rand(240);
+	}
 }
 
 void dxd::sim::Airfield::draw(Renderer *rend)

src/sim/airfield.hpp

@@ -13,9 +13,13 @@ class Airfield : public WorldObject
 private:
 	vec2 _position;
 	int _ttl;
+	int _next_spawn;
 
 public:
-	Airfield(vec2 position, int ttl) : _position(position), _ttl(ttl) {}
+	Airfield(vec2 position, int ttl) : _position(position), _ttl(ttl)
+	{
+		_next_spawn = 30;
+	}
 
 	void tick(float timestep, World *world) override;
 	void draw(Renderer *rend) override;