diff --git a/src/ban.cpp b/src/ban.cpp
index 5fa430702..7a7fb8c3c 100644
--- a/src/ban.cpp
+++ b/src/ban.cpp
@@ -28,14 +28,11 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "filesys.h"
 
 BanManager::BanManager(const std::string &banfilepath):
-		m_banfilepath(banfilepath),
-		m_modified(false)
+		m_banfilepath(banfilepath)
 {
-	try{
+	try {
 		load();
-	}
-	catch(SerializationError &e)
-	{
+	} catch(SerializationError &e) {
 		warningstream<<"BanManager: creating "
 				<<m_banfilepath<<std::endl;
 	}
diff --git a/src/ban.h b/src/ban.h
index 7c88406d4..35bf10abb 100644
--- a/src/ban.h
+++ b/src/ban.h
@@ -44,9 +44,9 @@ public:
 
 private:
 	std::mutex m_mutex;
-	std::string m_banfilepath;
+	std::string m_banfilepath = "";
 	StringMap m_ips;
-	bool m_modified;
+	bool m_modified = false;
 };
 
 #endif
diff --git a/src/camera.cpp b/src/camera.cpp
index 52a42a3a9..d5e32bf5a 100644
--- a/src/camera.cpp
+++ b/src/camera.cpp
@@ -41,36 +41,8 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 
 Camera::Camera(scene::ISceneManager* smgr, MapDrawControl& draw_control,
 		Client *client):
-	m_playernode(NULL),
-	m_headnode(NULL),
-	m_cameranode(NULL),
-
-	m_wieldmgr(NULL),
-	m_wieldnode(NULL),
-
 	m_draw_control(draw_control),
-	m_client(client),
-
-	m_camera_position(0,0,0),
-	m_camera_direction(0,0,0),
-	m_camera_offset(0,0,0),
-
-	m_aspect(1.0),
-	m_fov_x(1.0),
-	m_fov_y(1.0),
-
-	m_view_bobbing_anim(0),
-	m_view_bobbing_state(0),
-	m_view_bobbing_speed(0),
-	m_view_bobbing_fall(0),
-
-	m_digging_anim(0),
-	m_digging_button(-1),
-
-	m_wield_change_timer(0.125),
-	m_wield_item_next(),
-
-	m_camera_mode(CAMERA_MODE_FIRST)
+	m_client(client)
 {
 	//dstream<<FUNCTION_NAME<<std::endl;
 
diff --git a/src/camera.h b/src/camera.h
index 1e4800cba..8d213ede7 100644
--- a/src/camera.h
+++ b/src/camera.h
@@ -168,12 +168,12 @@ public:
 
 private:
 	// Nodes
-	scene::ISceneNode* m_playernode;
-	scene::ISceneNode* m_headnode;
-	scene::ICameraSceneNode* m_cameranode;
+	scene::ISceneNode *m_playernode = nullptr;
+	scene::ISceneNode *m_headnode = nullptr;
+	scene::ICameraSceneNode *m_cameranode = nullptr;
 
-	scene::ISceneManager* m_wieldmgr;
-	WieldMeshSceneNode* m_wieldnode;
+	scene::ISceneManager *m_wieldmgr = nullptr;
+	WieldMeshSceneNode *m_wieldnode = nullptr;
 
 	// draw control
 	MapDrawControl& m_draw_control;
@@ -189,33 +189,33 @@ private:
 	v3s16 m_camera_offset;
 
 	// Field of view and aspect ratio stuff
-	f32 m_aspect;
-	f32 m_fov_x;
-	f32 m_fov_y;
+	f32 m_aspect = 1.0f;
+	f32 m_fov_x = 1.0f;
+	f32 m_fov_y = 1.0f;
 
 	// View bobbing animation frame (0 <= m_view_bobbing_anim < 1)
-	f32 m_view_bobbing_anim;
+	f32 m_view_bobbing_anim = 0.0f;
 	// If 0, view bobbing is off (e.g. player is standing).
 	// If 1, view bobbing is on (player is walking).
 	// If 2, view bobbing is getting switched off.
-	s32 m_view_bobbing_state;
+	s32 m_view_bobbing_state = 0;
 	// Speed of view bobbing animation
-	f32 m_view_bobbing_speed;
+	f32 m_view_bobbing_speed = 0.0f;
 	// Fall view bobbing
-	f32 m_view_bobbing_fall;
+	f32 m_view_bobbing_fall = 0.0f;
 
 	// Digging animation frame (0 <= m_digging_anim < 1)
-	f32 m_digging_anim;
+	f32 m_digging_anim = 0.0f;
 	// If -1, no digging animation
 	// If 0, left-click digging animation
 	// If 1, right-click digging animation
-	s32 m_digging_button;
+	s32 m_digging_button = -1;
 
 	// Animation when changing wielded item
-	f32 m_wield_change_timer;
+	f32 m_wield_change_timer = 0.125f;
 	ItemStack m_wield_item_next;
 
-	CameraMode m_camera_mode;
+	CameraMode m_camera_mode = CAMERA_MODE_FIRST;
 
 	f32 m_cache_fall_bobbing_amount;
 	f32 m_cache_view_bobbing_amount;
diff --git a/src/chat.cpp b/src/chat.cpp
index ade3fefd3..72abc4669 100644
--- a/src/chat.cpp
+++ b/src/chat.cpp
@@ -27,13 +27,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "util/numeric.h"
 
 ChatBuffer::ChatBuffer(u32 scrollback):
-	m_scrollback(scrollback),
-	m_unformatted(),
-	m_cols(0),
-	m_rows(0),
-	m_scroll(0),
-	m_formatted(),
-	m_empty_formatted_line()
+	m_scrollback(scrollback)
 {
 	if (m_scrollback == 0)
 		m_scrollback = 1;
@@ -383,16 +377,7 @@ s32 ChatBuffer::getBottomScrollPos() const
 
 ChatPrompt::ChatPrompt(const std::wstring &prompt, u32 history_limit):
 	m_prompt(prompt),
-	m_line(L""),
-	m_history(),
-	m_history_index(0),
-	m_history_limit(history_limit),
-	m_cols(0),
-	m_view(0),
-	m_cursor(0),
-	m_cursor_len(0),
-	m_nick_completion_start(0),
-	m_nick_completion_end(0)
+	m_history_limit(history_limit)
 {
 }
 
diff --git a/src/chat.h b/src/chat.h
index b7c6b74b9..6a6b7c26f 100644
--- a/src/chat.h
+++ b/src/chat.h
@@ -32,21 +32,19 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 struct ChatLine
 {
 	// age in seconds
-	f32 age;
+	f32 age = 0.0f;
 	// name of sending player, or empty if sent by server
 	EnrichedString name;
 	// message text
 	EnrichedString text;
 
 	ChatLine(const std::wstring &a_name, const std::wstring &a_text):
-		age(0.0),
 		name(a_name),
 		text(a_text)
 	{
 	}
 
 	ChatLine(const EnrichedString &a_name, const EnrichedString &a_text):
-		age(0.0),
 		name(a_name),
 		text(a_text)
 	{
@@ -132,11 +130,11 @@ private:
 	std::vector<ChatLine> m_unformatted;
 
 	// Number of character columns in console
-	u32 m_cols;
+	u32 m_cols = 0;
 	// Number of character rows in console
-	u32 m_rows;
+	u32 m_rows = 0;
 	// Scroll position (console's top line index into m_formatted)
-	s32 m_scroll;
+	s32 m_scroll = 0;
 	// Array of formatted lines
 	std::vector<ChatFormattedLine> m_formatted;
 	// Empty formatted line, for error returns
@@ -225,29 +223,29 @@ protected:
 
 private:
 	// Prompt prefix
-	std::wstring m_prompt;
+	std::wstring m_prompt = L"";
 	// Currently edited line
-	std::wstring m_line;
+	std::wstring m_line = L"";
 	// History buffer
 	std::vector<std::wstring> m_history;
 	// History index (0 <= m_history_index <= m_history.size())
-	u32 m_history_index;
+	u32 m_history_index = 0;
 	// Maximum number of history entries
 	u32 m_history_limit;
 
 	// Number of columns excluding columns reserved for the prompt
-	s32 m_cols;
+	s32 m_cols = 0;
 	// Start of visible portion (index into m_line)
-	s32 m_view;
+	s32 m_view = 0;
 	// Cursor (index into m_line)
-	s32 m_cursor;
+	s32 m_cursor = 0;
 	// Cursor length (length of selected portion of line)
-	s32 m_cursor_len;
+	s32 m_cursor_len = 0;
 
 	// Last nick completion start (index into m_line)
-	s32 m_nick_completion_start;
+	s32 m_nick_completion_start = 0;
 	// Last nick completion start (index into m_line)
-	s32 m_nick_completion_end;
+	s32 m_nick_completion_end = 0;
 };
 
 class ChatBackend
diff --git a/src/client.cpp b/src/client.cpp
index 1f6f64ce0..7a097bc0d 100644
--- a/src/client.cpp
+++ b/src/client.cpp
@@ -69,11 +69,6 @@ Client::Client(
 		bool ipv6,
 		GameUIFlags *game_ui_flags
 ):
-	m_packetcounter_timer(0.0),
-	m_connection_reinit_timer(0.1),
-	m_avg_rtt_timer(0.0),
-	m_playerpos_send_timer(0.0),
-	m_ignore_damage_timer(0.0),
 	m_tsrc(tsrc),
 	m_shsrc(shsrc),
 	m_itemdef(itemdef),
@@ -92,40 +87,13 @@ Client::Client(
 	m_con(PROTOCOL_ID, 512, CONNECTION_TIMEOUT, ipv6, this),
 	m_address_name(address_name),
 	m_device(device),
-	m_camera(NULL),
-	m_minimap(NULL),
-	m_minimap_disabled_by_server(false),
 	m_server_ser_ver(SER_FMT_VER_INVALID),
-	m_proto_ver(0),
-	m_playeritem(0),
-	m_inventory_updated(false),
-	m_inventory_from_server(NULL),
-	m_inventory_from_server_age(0.0),
-	m_animation_time(0),
-	m_crack_level(-1),
-	m_crack_pos(0,0,0),
 	m_last_chat_message_sent(time(NULL)),
-	m_chat_message_allowance(5.0f),
-	m_map_seed(0),
 	m_password(password),
 	m_chosen_auth_mech(AUTH_MECHANISM_NONE),
-	m_auth_data(NULL),
-	m_access_denied(false),
-	m_access_denied_reconnect(false),
-	m_itemdef_received(false),
-	m_nodedef_received(false),
 	m_media_downloader(new ClientMediaDownloader()),
-	m_time_of_day_set(false),
-	m_last_time_of_day_f(-1),
-	m_time_of_day_update_timer(0),
-	m_recommended_send_interval(0.1),
-	m_removed_sounds_check_timer(0),
 	m_state(LC_Created),
-	m_localdb(NULL),
-	m_script(NULL),
-	m_mod_storage_save_timer(10.0f),
-	m_game_ui_flags(game_ui_flags),
-	m_shutdown(false)
+	m_game_ui_flags(game_ui_flags)
 {
 	// Add local player
 	m_env.setLocalPlayer(new LocalPlayer(this, playername));
diff --git a/src/client.h b/src/client.h
index babfe4680..1d5ab1298 100644
--- a/src/client.h
+++ b/src/client.h
@@ -575,11 +575,11 @@ private:
 
 	bool canSendChatMessage() const;
 
-	float m_packetcounter_timer;
-	float m_connection_reinit_timer;
-	float m_avg_rtt_timer;
-	float m_playerpos_send_timer;
-	float m_ignore_damage_timer; // Used after server moves player
+	float m_packetcounter_timer = 0.0f;
+	float m_connection_reinit_timer = 0.1f;
+	float m_avg_rtt_timer = 0.0f;
+	float m_playerpos_send_timer = 0.0f;
+	float m_ignore_damage_timer = 0.0f; // Used after server moves player
 	IntervalLimiter m_map_timer_and_unload_interval;
 
 	IWritableTextureSource *m_tsrc;
@@ -596,9 +596,9 @@ private:
 	con::Connection m_con;
 	std::string m_address_name;
 	IrrlichtDevice *m_device;
-	Camera *m_camera;
-	Minimap *m_minimap;
-	bool m_minimap_disabled_by_server;
+	Camera *m_camera = nullptr;
+	Minimap *m_minimap = nullptr;
+	bool m_minimap_disabled_by_server = false;
 	// Server serialization version
 	u8 m_server_ser_ver;
 
@@ -607,16 +607,16 @@ private:
 	// and aren't accurate. We simply just don't know, because
 	// the server didn't send the version back then.
 	// If 0, server init hasn't been received yet.
-	u8 m_proto_ver;
+	u8 m_proto_ver = 0;
 
-	u16 m_playeritem;
-	bool m_inventory_updated;
-	Inventory *m_inventory_from_server;
-	float m_inventory_from_server_age;
+	u16 m_playeritem = 0;
+	bool m_inventory_updated = false;
+	Inventory *m_inventory_from_server = nullptr;
+	float m_inventory_from_server_age = 0.0f;
 	PacketCounter m_packetcounter;
 	// Block mesh animation parameters
-	float m_animation_time;
-	int m_crack_level;
+	float m_animation_time = 0.0f;
+	int m_crack_level = -1;
 	v3s16 m_crack_pos;
 	// 0 <= m_daynight_i < DAYNIGHT_CACHE_COUNT
 	//s32 m_daynight_i;
@@ -624,13 +624,13 @@ private:
 	std::queue<std::wstring> m_chat_queue;
 	std::queue<std::wstring> m_out_chat_queue;
 	u32 m_last_chat_message_sent;
-	float m_chat_message_allowance;
+	float m_chat_message_allowance = 5.0f;
 
 	// The authentication methods we can use to enter sudo mode (=change password)
 	u32 m_sudo_auth_methods;
 
 	// The seed returned by the server in TOCLIENT_INIT is stored here
-	u64 m_map_seed;
+	u64 m_map_seed = 0;
 
 	// Auth data
 	std::string m_playername;
@@ -639,27 +639,27 @@ private:
 	std::string m_new_password;
 	// Usable by auth mechanisms.
 	AuthMechanism m_chosen_auth_mech;
-	void * m_auth_data;
+	void *m_auth_data = nullptr;
 
 
-	bool m_access_denied;
-	bool m_access_denied_reconnect;
-	std::string m_access_denied_reason;
+	bool m_access_denied = false;
+	bool m_access_denied_reconnect = false;
+	std::string m_access_denied_reason = "";
 	std::queue<ClientEvent> m_client_event_queue;
-	bool m_itemdef_received;
-	bool m_nodedef_received;
+	bool m_itemdef_received = false;
+	bool m_nodedef_received = false;
 	ClientMediaDownloader *m_media_downloader;
 
 	// time_of_day speed approximation for old protocol
-	bool m_time_of_day_set;
-	float m_last_time_of_day_f;
-	float m_time_of_day_update_timer;
+	bool m_time_of_day_set = false;
+	float m_last_time_of_day_f = -1.0f;
+	float m_time_of_day_update_timer = 0.0f;
 
 	// An interval for generally sending object positions and stuff
-	float m_recommended_send_interval;
+	float m_recommended_send_interval = 0.1f;
 
 	// Sounds
-	float m_removed_sounds_check_timer;
+	float m_removed_sounds_check_timer = 0.0f;
 	// Mapping from server sound ids to our sound ids
 	std::unordered_map<s32, int> m_sounds_server_to_client;
 	// And the other way!
@@ -681,17 +681,17 @@ private:
 	LocalClientState m_state;
 
 	// Used for saving server map to disk client-side
-	MapDatabase *m_localdb;
+	MapDatabase *m_localdb = nullptr;
 	IntervalLimiter m_localdb_save_interval;
 	u16 m_cache_save_interval;
 
-	ClientScripting *m_script;
+	ClientScripting *m_script = nullptr;
 	bool m_modding_enabled;
 	std::unordered_map<std::string, ModMetadata *> m_mod_storages;
-	float m_mod_storage_save_timer;
+	float m_mod_storage_save_timer = 10.0f;
 	GameUIFlags *m_game_ui_flags;
 
-	bool m_shutdown;
+	bool m_shutdown = false;
 };
 
 #endif // !CLIENT_HEADER
diff --git a/src/clientenvironment.cpp b/src/clientenvironment.cpp
index d6af06dde..2a761ee1d 100644
--- a/src/clientenvironment.cpp
+++ b/src/clientenvironment.cpp
@@ -41,11 +41,9 @@ ClientEnvironment::ClientEnvironment(ClientMap *map, scene::ISceneManager *smgr,
 	IrrlichtDevice *irr):
 	Environment(client),
 	m_map(map),
-	m_local_player(NULL),
 	m_smgr(smgr),
 	m_texturesource(texturesource),
 	m_client(client),
-	m_script(NULL),
 	m_irr(irr)
 {
 	char zero = 0;
diff --git a/src/clientenvironment.h b/src/clientenvironment.h
index 2906553f0..c8b192ee9 100644
--- a/src/clientenvironment.h
+++ b/src/clientenvironment.h
@@ -176,11 +176,11 @@ public:
 	v3s16 getCameraOffset() const { return m_camera_offset; }
 private:
 	ClientMap *m_map;
-	LocalPlayer *m_local_player;
+	LocalPlayer *m_local_player = nullptr;
 	scene::ISceneManager *m_smgr;
 	ITextureSource *m_texturesource;
 	Client *m_client;
-	ClientScripting *m_script;
+	ClientScripting *m_script = nullptr;
 	IrrlichtDevice *m_irr;
 	ClientActiveObjectMap m_active_objects;
 	std::vector<ClientSimpleObject*> m_simple_objects;
diff --git a/src/clientiface.h b/src/clientiface.h
index edcd91ef3..09855a372 100644
--- a/src/clientiface.h
+++ b/src/clientiface.h
@@ -226,51 +226,27 @@ public:
 	// NOTE: If client is made allowed to exist while peer doesn't,
 	//       this has to be set to 0 when there is no peer.
 	//       Also, the client must be moved to some other container.
-	u16 peer_id;
+	u16 peer_id = PEER_ID_INEXISTENT;
 	// The serialization version to use with the client
-	u8 serialization_version;
+	u8 serialization_version = SER_FMT_VER_INVALID;
 	//
-	u16 net_proto_version;
+	u16 net_proto_version = 0;
 
 	/* Authentication information */
-	std::string enc_pwd;
-	bool create_player_on_auth_success;
-	AuthMechanism chosen_mech;
-	void * auth_data;
-	u32 allowed_auth_mechs;
-	u32 allowed_sudo_mechs;
+	std::string enc_pwd = "";
+	bool create_player_on_auth_success = false;
+	AuthMechanism chosen_mech  = AUTH_MECHANISM_NONE;
+	void *auth_data = nullptr;
+	u32 allowed_auth_mechs = 0;
+	u32 allowed_sudo_mechs = 0;
 
 	bool isSudoMechAllowed(AuthMechanism mech)
 	{ return allowed_sudo_mechs & mech; }
 	bool isMechAllowed(AuthMechanism mech)
 	{ return allowed_auth_mechs & mech; }
 
-	RemoteClient():
-		peer_id(PEER_ID_INEXISTENT),
-		serialization_version(SER_FMT_VER_INVALID),
-		net_proto_version(0),
-		create_player_on_auth_success(false),
-		chosen_mech(AUTH_MECHANISM_NONE),
-		auth_data(NULL),
-		m_time_from_building(9999),
-		m_pending_serialization_version(SER_FMT_VER_INVALID),
-		m_state(CS_Created),
-		m_nearest_unsent_d(0),
-		m_nearest_unsent_reset_timer(0.0),
-		m_excess_gotblocks(0),
-		m_nothing_to_send_pause_timer(0.0),
-		m_name(""),
-		m_version_major(0),
-		m_version_minor(0),
-		m_version_patch(0),
-		m_full_version("unknown"),
-		m_deployed_compression(0),
-		m_connection_time(porting::getTimeS())
-	{
-	}
-	~RemoteClient()
-	{
-	}
+	RemoteClient() {}
+	~RemoteClient() {}
 
 	/*
 		Finds block that should be sent next to the client.
@@ -317,7 +293,7 @@ public:
 	}
 
 	// Time from last placing or removing blocks
-	float m_time_from_building;
+	float m_time_from_building = 9999;
 
 	/*
 		List of active objects that the client knows of.
@@ -361,10 +337,10 @@ public:
 	u8 getPatch() const { return m_version_patch; }
 private:
 	// Version is stored in here after INIT before INIT2
-	u8 m_pending_serialization_version;
+	u8 m_pending_serialization_version = SER_FMT_VER_INVALID;
 
 	/* current state of client */
-	ClientState m_state;
+	ClientState m_state = CS_Created;
 
 	/*
 		Blocks that have been sent to client.
@@ -376,9 +352,9 @@ private:
 		No MapBlock* is stored here because the blocks can get deleted.
 	*/
 	std::set<v3s16> m_blocks_sent;
-	s16 m_nearest_unsent_d;
+	s16 m_nearest_unsent_d = 0;
 	v3s16 m_last_center;
-	float m_nearest_unsent_reset_timer;
+	float m_nearest_unsent_reset_timer = 0.0f;
 
 	/*
 		Blocks that are currently on the line.
@@ -407,31 +383,31 @@ private:
 		and the client then sends two GOTBLOCKs.
 		This is resetted by PrintInfo()
 	*/
-	u32 m_excess_gotblocks;
+	u32 m_excess_gotblocks = 0;
 
 	// CPU usage optimization
-	float m_nothing_to_send_pause_timer;
+	float m_nothing_to_send_pause_timer = 0.0f;
 
 	/*
 		name of player using this client
 	*/
-	std::string m_name;
+	std::string m_name = "";
 
 	/*
 		client information
 	 */
-	u8 m_version_major;
-	u8 m_version_minor;
-	u8 m_version_patch;
+	u8 m_version_major = 0;
+	u8 m_version_minor = 0;
+	u8 m_version_patch = 0;
 
-	std::string m_full_version;
+	std::string m_full_version = "unknown";
 
-	u16 m_deployed_compression;
+	u16 m_deployed_compression = 0;
 
 	/*
 		time this client was created
 	 */
-	const u64 m_connection_time;
+	const u64 m_connection_time = porting::getTimeS();
 };
 
 typedef std::unordered_map<u16, RemoteClient*> RemoteClientMap;
diff --git a/src/clientmap.cpp b/src/clientmap.cpp
index 6cd24ffc6..9186e3cab 100644
--- a/src/clientmap.cpp
+++ b/src/clientmap.cpp
@@ -67,13 +67,6 @@ ClientMap::ClientMap(
 
 ClientMap::~ClientMap()
 {
-	/*MutexAutoLock lock(mesh_mutex);
-
-	if(mesh != NULL)
-	{
-		mesh->drop();
-		mesh = NULL;
-	}*/
 }
 
 MapSector * ClientMap::emergeSector(v2s16 p2d)
diff --git a/src/clientmap.h b/src/clientmap.h
index 84228f4ca..8d2720771 100644
--- a/src/clientmap.h
+++ b/src/clientmap.h
@@ -28,30 +28,20 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 
 struct MapDrawControl
 {
-	MapDrawControl():
-		range_all(false),
-		wanted_range(0),
-		wanted_max_blocks(0),
-		show_wireframe(false),
-		blocks_drawn(0),
-		blocks_would_have_drawn(0),
-		farthest_drawn(0)
-	{
-	}
 	// Overrides limits by drawing everything
-	bool range_all;
+	bool range_all = false;
 	// Wanted drawing range
-	float wanted_range;
+	float wanted_range = 0.0f;
 	// Maximum number of blocks to draw
-	u32 wanted_max_blocks;
+	u32 wanted_max_blocks = 0;
 	// show a wire frame for debugging
-	bool show_wireframe;
+	bool show_wireframe = false;
 	// Number of blocks rendered is written here by the renderer
-	u32 blocks_drawn;
+	u32 blocks_drawn = 0;
 	// Number of blocks that would have been drawn in wanted_range
-	u32 blocks_would_have_drawn;
+	u32 blocks_would_have_drawn = 0;
 	// Distance to the farthest block drawn
-	float farthest_drawn;
+	float farthest_drawn = 0;
 };
 
 class Client;
@@ -137,13 +127,14 @@ public:
 private:
 	Client *m_client;
 
-	aabb3f m_box;
+	aabb3f m_box = aabb3f(-BS * 1000000, -BS * 1000000, -BS * 1000000,
+		BS * 1000000, BS * 1000000, BS * 1000000);
 
 	MapDrawControl &m_control;
 
 	v3f m_camera_position;
-	v3f m_camera_direction;
-	f32 m_camera_fov;
+	v3f m_camera_direction = v3f(0,0,1);
+	f32 m_camera_fov = M_PI;
 	v3s16 m_camera_offset;
 
 	std::map<v3s16, MapBlock*> m_drawlist;
diff --git a/src/clientmedia.cpp b/src/clientmedia.cpp
index 2877d8a2e..ca6f3d563 100644
--- a/src/clientmedia.cpp
+++ b/src/clientmedia.cpp
@@ -43,17 +43,8 @@ static std::string getMediaCacheDir()
 
 ClientMediaDownloader::ClientMediaDownloader():
 	m_media_cache(getMediaCacheDir()),
-	m_initial_step_done(false),
-	m_uncached_count(0),
-	m_uncached_received_count(0),
-	m_name_bound("")
+	m_httpfetch_caller(HTTPFETCH_DISCARD)
 {
-	m_httpfetch_caller = HTTPFETCH_DISCARD;
-	m_httpfetch_active = 0;
-	m_httpfetch_active_limit = 0;
-	m_httpfetch_next_id = 0;
-	m_httpfetch_timeout = 0;
-	m_outstanding_hash_sets = 0;
 }
 
 ClientMediaDownloader::~ClientMediaDownloader()
diff --git a/src/clientmedia.h b/src/clientmedia.h
index 4c0c3c888..1834fb67f 100644
--- a/src/clientmedia.h
+++ b/src/clientmedia.h
@@ -123,28 +123,28 @@ private:
 
 	// Has an attempt been made to load media files from the file cache?
 	// Have hash sets been requested from remote servers?
-	bool m_initial_step_done;
+	bool m_initial_step_done = false;
 
 	// Total number of media files to load
-	s32 m_uncached_count;
+	s32 m_uncached_count = 0;
 
 	// Number of media files that have been received
-	s32 m_uncached_received_count;
+	s32 m_uncached_received_count = 0;
 
 	// Status of remote transfers
 	unsigned long m_httpfetch_caller;
-	unsigned long m_httpfetch_next_id;
-	long m_httpfetch_timeout;
-	s32 m_httpfetch_active;
-	s32 m_httpfetch_active_limit;
-	s32 m_outstanding_hash_sets;
+	unsigned long m_httpfetch_next_id = 0;
+	long m_httpfetch_timeout = 0;
+	s32 m_httpfetch_active = 0;
+	s32 m_httpfetch_active_limit = 0;
+	s32 m_outstanding_hash_sets = 0;
 	std::unordered_map<unsigned long, std::string> m_remote_file_transfers;
 
 	// All files up to this name have either been received from a
 	// remote server or failed on all remote servers, so those files
 	// don't need to be looked at again
 	// (use m_files.upper_bound(m_name_bound) to get an iterator)
-	std::string m_name_bound;
+	std::string m_name_bound = "";
 
 };
 
diff --git a/src/clientsimpleobject.h b/src/clientsimpleobject.h
index f5b79b64f..3e7704757 100644
--- a/src/clientsimpleobject.h
+++ b/src/clientsimpleobject.h
@@ -27,9 +27,9 @@ class ClientSimpleObject
 {
 protected:
 public:
-	bool m_to_be_removed;
+	bool m_to_be_removed = false;
 
-	ClientSimpleObject() : m_to_be_removed(false) {}
+	ClientSimpleObject() {}
 	virtual ~ClientSimpleObject() {}
 	virtual void step(float dtime) {}
 };
diff --git a/src/clouds.cpp b/src/clouds.cpp
index 10a533cae..dc08d1ac0 100644
--- a/src/clouds.cpp
+++ b/src/clouds.cpp
@@ -44,11 +44,7 @@ Clouds::Clouds(
 		s16 cloudheight
 ):
 	scene::ISceneNode(parent, mgr, id),
-	m_seed(seed),
-	m_camera_pos(0.0f, 0.0f),
-	m_origin(0.0f, 0.0f),
-	m_camera_offset(0.0f, 0.0f, 0.0f),
-	m_color(1.0f, 1.0f, 1.0f, 1.0f)
+	m_seed(seed)
 {
 	m_material.setFlag(video::EMF_LIGHTING, false);
 	//m_material.setFlag(video::EMF_BACK_FACE_CULLING, false);
diff --git a/src/clouds.h b/src/clouds.h
index a0bda28df..869f7f7fc 100644
--- a/src/clouds.h
+++ b/src/clouds.h
@@ -53,7 +53,7 @@ public:
 	virtual void OnRegisterSceneNode();
 
 	virtual void render();
-	
+
 	virtual const aabb3f &getBoundingBox() const
 	{
 		return m_box;
@@ -68,7 +68,7 @@ public:
 	{
 		return m_material;
 	}
-	
+
 	/*
 		Other stuff
 	*/
@@ -76,7 +76,7 @@ public:
 	void step(float dtime);
 
 	void update(v2f camera_p, video::SColorf color);
-	
+
 	void updateCameraOffset(v3s16 camera_offset)
 	{
 		m_camera_offset = camera_offset;
@@ -135,9 +135,8 @@ private:
 	u32 m_seed;
 	v2f m_camera_pos;
 	v2f m_origin;
-	v2f m_speed;
 	v3s16 m_camera_offset;
-	video::SColorf m_color;
+	video::SColorf m_color = video::SColorf(1.0f, 1.0f, 1.0f, 1.0f);
 	CloudParams m_params;
 
 };
diff --git a/src/collision.cpp b/src/collision.cpp
index c0891c152..61972b2e8 100644
--- a/src/collision.cpp
+++ b/src/collision.cpp
@@ -39,7 +39,6 @@ struct NearbyCollisionInfo {
 	NearbyCollisionInfo(bool is_ul, bool is_obj, int bouncy,
 			const v3s16 &pos, const aabb3f &box) :
 		is_unloaded(is_ul),
-		is_step_up(false),
 		is_object(is_obj),
 		bouncy(bouncy),
 		position(pos),
@@ -47,7 +46,7 @@ struct NearbyCollisionInfo {
 	{}
 
 	bool is_unloaded;
-	bool is_step_up;
+	bool is_step_up = false;
 	bool is_object;
 	int bouncy;
 	v3s16 position;
@@ -469,7 +468,6 @@ collisionMoveResult collisionMoveSimple(Environment *env, IGameDef *gamedef,
 							d));
 
 			// Get bounce multiplier
-			bool bouncy = (nearest_info.bouncy >= 1);
 			float bounce = -(float)nearest_info.bouncy / 100.0;
 
 			// Move to the point of collision and reduce dtime by nearest_dtime
@@ -499,7 +497,6 @@ collisionMoveResult collisionMoveSimple(Environment *env, IGameDef *gamedef,
 				info.type = COLLISION_NODE;
 
 			info.node_p = nearest_info.position;
-			info.bouncy = bouncy;
 			info.old_speed = *speed_f;
 
 			// Set the speed component that caused the collision to zero
@@ -513,7 +510,6 @@ collisionMoveResult collisionMoveSimple(Environment *env, IGameDef *gamedef,
 				else
 					speed_f->X = 0;
 				result.collides = true;
-				result.collides_xz = true;
 			} else if (nearest_collided == 1) { // Y
 				if(fabs(speed_f->Y) > BS * 3)
 					speed_f->Y *= bounce;
@@ -526,7 +522,6 @@ collisionMoveResult collisionMoveSimple(Environment *env, IGameDef *gamedef,
 				else
 					speed_f->Z = 0;
 				result.collides = true;
-				result.collides_xz = true;
 			}
 
 			info.new_speed = *speed_f;
@@ -572,8 +567,6 @@ collisionMoveResult collisionMoveSimple(Environment *env, IGameDef *gamedef,
 
 				if (box_info.is_object)
 					result.standing_on_object = true;
-				if (box_info.is_unloaded)
-					result.standing_on_unloaded = true;
 			}
 		}
 	}
diff --git a/src/collision.h b/src/collision.h
index 1ceaba81c..50755224b 100644
--- a/src/collision.h
+++ b/src/collision.h
@@ -36,37 +36,20 @@ enum CollisionType
 
 struct CollisionInfo
 {
-	enum CollisionType type;
-	v3s16 node_p; // COLLISION_NODE
-	bool bouncy;
+	CollisionInfo() {}
+	CollisionType type = COLLISION_NODE;
+	v3s16 node_p = v3s16(-32768,-32768,-32768); // COLLISION_NODE
 	v3f old_speed;
 	v3f new_speed;
-
-	CollisionInfo():
-		type(COLLISION_NODE),
-		node_p(-32768,-32768,-32768),
-		bouncy(false),
-		old_speed(0,0,0),
-		new_speed(0,0,0)
-	{}
 };
 
 struct collisionMoveResult
 {
-	bool touching_ground;
-	bool collides;
-	bool collides_xz;
-	bool standing_on_unloaded;
-	bool standing_on_object;
+	collisionMoveResult() {}
+	bool touching_ground = false;
+	bool collides = false;
+	bool standing_on_object = false;
 	std::vector<CollisionInfo> collisions;
-
-	collisionMoveResult():
-		touching_ground(false),
-		collides(false),
-		collides_xz(false),
-		standing_on_unloaded(false),
-		standing_on_object(false)
-	{}
 };
 
 // Moves using a single iteration; speed should not exceed pos_max_d/dtime
diff --git a/src/content_cao.cpp b/src/content_cao.cpp
index a5a55fd7e..0b9df6451 100644
--- a/src/content_cao.cpp
+++ b/src/content_cao.cpp
@@ -51,16 +51,6 @@ struct ToolCapabilities;
 
 std::unordered_map<u16, ClientActiveObject::Factory> ClientActiveObject::m_types;
 
-SmoothTranslator::SmoothTranslator():
-	vect_old(0,0,0),
-	vect_show(0,0,0),
-	vect_aim(0,0,0),
-	anim_counter(0),
-	anim_time(0),
-	anim_time_counter(0),
-	aim_is_end(true)
-{}
-
 void SmoothTranslator::init(v3f vect)
 {
 	vect_old = vect;
@@ -72,11 +62,6 @@ void SmoothTranslator::init(v3f vect)
 	aim_is_end = true;
 }
 
-void SmoothTranslator::sharpen()
-{
-	init(vect_show);
-}
-
 void SmoothTranslator::update(v3f vect_new, bool is_end_position, float update_interval)
 {
 	aim_is_end = is_end_position;
@@ -113,11 +98,6 @@ void SmoothTranslator::translate(f32 dtime)
 	vect_show = vect_old + vect_move * moveratio;
 }
 
-bool SmoothTranslator::is_moving()
-{
-	return ((anim_time_counter / anim_time) < 1.4);
-}
-
 /*
 	Other stuff
 */
@@ -325,8 +305,6 @@ private:
 	std::string m_infotext;
 };
 
-#include "inventory.h"
-
 // Prototype
 ItemCAO proto_ItemCAO(NULL, NULL);
 
@@ -538,49 +516,7 @@ void ItemCAO::initialize(const std::string &data)
 #include "genericobject.h"
 
 GenericCAO::GenericCAO(Client *client, ClientEnvironment *env):
-		ClientActiveObject(0, client, env),
-		//
-		m_is_player(false),
-		m_is_local_player(false),
-		//
-		m_smgr(NULL),
-		m_irr(NULL),
-		m_client(NULL),
-		m_selection_box(-BS/3.,-BS/3.,-BS/3., BS/3.,BS/3.,BS/3.),
-		m_meshnode(NULL),
-		m_animated_meshnode(NULL),
-		m_wield_meshnode(NULL),
-		m_spritenode(NULL),
-		m_nametag(NULL),
-		m_position(v3f(0,10*BS,0)),
-		m_velocity(v3f(0,0,0)),
-		m_acceleration(v3f(0,0,0)),
-		m_yaw(0),
-		m_hp(1),
-		m_tx_size(1,1),
-		m_tx_basepos(0,0),
-		m_initial_tx_basepos_set(false),
-		m_tx_select_horiz_by_yawpitch(false),
-		m_animation_range(v2s32(0,0)),
-		m_animation_speed(15),
-		m_animation_blend(0),
-		m_animation_loop(true),
-		m_bone_position(),
-		m_attachment_bone(""),
-		m_attachment_position(v3f(0,0,0)),
-		m_attachment_rotation(v3f(0,0,0)),
-		m_attached_to_local(false),
-		m_anim_frame(0),
-		m_anim_num_frames(1),
-		m_anim_framelength(0.2),
-		m_anim_timer(0),
-		m_reset_textures_timer(-1),
-		m_previous_texture_modifier(""),
-		m_current_texture_modifier(""),
-		m_visuals_expired(false),
-		m_step_distance_counter(0),
-		m_last_light(255),
-		m_is_visible(false)
+		ClientActiveObject(0, client, env)
 {
 	if (client == NULL) {
 		ClientActiveObject::registerType(getType(), create);
@@ -639,7 +575,7 @@ void GenericCAO::processInitData(const std::string &data)
 	if (version == 1) { // In PROTOCOL_VERSION 14
 		m_name = deSerializeString(is);
 		m_is_player = readU8(is);
-		m_id = readS16(is);
+		m_id = readU16(is);
 		m_position = readV3F1000(is);
 		m_yaw = readF1000(is);
 		m_hp = readS16(is);
diff --git a/src/content_cao.h b/src/content_cao.h
index e5b23aa35..e353b71de 100644
--- a/src/content_cao.h
+++ b/src/content_cao.h
@@ -25,6 +25,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "clientobject.h"
 #include "object_properties.h"
 #include "itemgroup.h"
+#include "constants.h"
 
 class Camera;
 class Client;
@@ -39,76 +40,74 @@ struct SmoothTranslator
 	v3f vect_old;
 	v3f vect_show;
 	v3f vect_aim;
-	f32 anim_counter;
+	f32 anim_counter = 0;
 	f32 anim_time;
-	f32 anim_time_counter;
-	bool aim_is_end;
+	f32 anim_time_counter = 0;
+	bool aim_is_end = true;
 
-	SmoothTranslator();
+	SmoothTranslator() {};
 
 	void init(v3f vect);
 
-	void sharpen();
-
 	void update(v3f vect_new, bool is_end_position=false, float update_interval=-1);
 
 	void translate(f32 dtime);
-
-	bool is_moving();
 };
 
 class GenericCAO : public ClientActiveObject
 {
 private:
 	// Only set at initialization
-	std::string m_name;
-	bool m_is_player;
-	bool m_is_local_player;
+	std::string m_name = "";
+	bool m_is_player = false;
+	bool m_is_local_player = false;
 	// Property-ish things
 	ObjectProperties m_prop;
 	//
-	scene::ISceneManager *m_smgr;
-	IrrlichtDevice *m_irr;
-	Client *m_client;
-	aabb3f m_selection_box;
-	scene::IMeshSceneNode *m_meshnode;
-	scene::IAnimatedMeshSceneNode *m_animated_meshnode;
-	WieldMeshSceneNode *m_wield_meshnode;
-	scene::IBillboardSceneNode *m_spritenode;
-	Nametag* m_nametag;
-	v3f m_position;
+	scene::ISceneManager *m_smgr = nullptr;
+	IrrlichtDevice *m_irr = nullptr;
+	Client *m_client = nullptr;
+	aabb3f m_selection_box = aabb3f(-BS/3.,-BS/3.,-BS/3., BS/3.,BS/3.,BS/3.);
+	scene::IMeshSceneNode *m_meshnode = nullptr;
+	scene::IAnimatedMeshSceneNode *m_animated_meshnode = nullptr;
+	WieldMeshSceneNode *m_wield_meshnode = nullptr;
+	scene::IBillboardSceneNode *m_spritenode = nullptr;
+	Nametag *m_nametag = nullptr;
+	v3f m_position = v3f(0.0f, 10.0f * BS, 0);
 	v3f m_velocity;
 	v3f m_acceleration;
-	float m_yaw;
-	s16 m_hp;
+	float m_yaw = 0.0f;
+	s16 m_hp = 1;
 	SmoothTranslator pos_translator;
 	// Spritesheet/animation stuff
-	v2f m_tx_size;
+	v2f m_tx_size = v2f(1,1);
 	v2s16 m_tx_basepos;
-	bool m_initial_tx_basepos_set;
-	bool m_tx_select_horiz_by_yawpitch;
+	bool m_initial_tx_basepos_set = false;
+	bool m_tx_select_horiz_by_yawpitch = false;
 	v2s32 m_animation_range;
-	int m_animation_speed;
-	int m_animation_blend;
-	bool m_animation_loop;
+	int m_animation_speed = 15;
+	int m_animation_blend = 0;
+	bool m_animation_loop = true;
 	// stores position and rotation for each bone name
 	std::unordered_map<std::string, core::vector2d<v3f>> m_bone_position;
-	std::string m_attachment_bone;
+	std::string m_attachment_bone = "";
 	v3f m_attachment_position;
 	v3f m_attachment_rotation;
-	bool m_attached_to_local;
-	int m_anim_frame;
-	int m_anim_num_frames;
-	float m_anim_framelength;
-	float m_anim_timer;
+	bool m_attached_to_local = false;
+	int m_anim_frame = 0;
+	int m_anim_num_frames = 1;
+	float m_anim_framelength = 0.2f;
+	float m_anim_timer = 0.0f;
 	ItemGroupList m_armor_groups;
-	float m_reset_textures_timer;
-	std::string m_previous_texture_modifier; // stores texture modifier before punch update
-	std::string m_current_texture_modifier;  // last applied texture modifier
-	bool m_visuals_expired;
-	float m_step_distance_counter;
-	u8 m_last_light;
-	bool m_is_visible;
+	float m_reset_textures_timer = -1.0f;
+	// stores texture modifier before punch update
+	std::string m_previous_texture_modifier = "";
+	// last applied texture modifier
+	std::string m_current_texture_modifier = "";
+	bool m_visuals_expired = false;
+	float m_step_distance_counter = 0.0f;
+	u8 m_last_light = 255;
+	bool m_is_visible = false;
 
 	std::vector<u16> m_children;
 
diff --git a/src/content_cso.cpp b/src/content_cso.cpp
index aca71212b..10d1f498b 100644
--- a/src/content_cso.cpp
+++ b/src/content_cso.cpp
@@ -26,13 +26,11 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 
 class SmokePuffCSO: public ClientSimpleObject
 {
-	float m_age;
-	scene::IBillboardSceneNode *m_spritenode;
+	float m_age = 0.0f;
+	scene::IBillboardSceneNode *m_spritenode = nullptr;
 public:
 	SmokePuffCSO(scene::ISceneManager *smgr,
-			ClientEnvironment *env, v3f pos, v2f size):
-		m_age(0),
-		m_spritenode(NULL)
+			ClientEnvironment *env, v3f pos, v2f size)
 	{
 		infostream<<"SmokePuffCSO: constructing"<<std::endl;
 		m_spritenode = smgr->addBillboardSceneNode(
diff --git a/src/content_nodemeta.cpp b/src/content_nodemeta.cpp
index 79a32b6bf..fc2859d27 100644
--- a/src/content_nodemeta.cpp
+++ b/src/content_nodemeta.cpp
@@ -189,12 +189,3 @@ void content_nodemeta_deserialize_legacy(std::istream &is,
 			timers->set(NodeTimer(1., 0., p));
 	}
 }
-
-void content_nodemeta_serialize_legacy(std::ostream &os, NodeMetadataList *meta)
-{
-	// Sorry, I was too lazy to implement this. --kahrl
-	writeU16(os, 1); // version
-	writeU16(os, 0); // count
-}
-
-// END
diff --git a/src/content_nodemeta.h b/src/content_nodemeta.h
index ebc01d9a8..3c632ed4a 100644
--- a/src/content_nodemeta.h
+++ b/src/content_nodemeta.h
@@ -34,7 +34,5 @@ void content_nodemeta_deserialize_legacy(std::istream &is,
 		NodeMetadataList *meta, NodeTimerList *timers,
 		IItemDefManager *item_def_mgr);
 
-void content_nodemeta_serialize_legacy(std::ostream &os, NodeMetadataList *meta);
-
 #endif
 
diff --git a/src/content_sao.cpp b/src/content_sao.cpp
index 90d830ce3..c6c00768e 100644
--- a/src/content_sao.cpp
+++ b/src/content_sao.cpp
@@ -106,19 +106,7 @@ TestSAO proto_TestSAO(NULL, v3f(0,0,0));
  */
 
 UnitSAO::UnitSAO(ServerEnvironment *env, v3f pos):
-	ServerActiveObject(env, pos),
-	m_hp(-1),
-	m_yaw(0),
-	m_properties_sent(true),
-	m_armor_groups_sent(false),
-	m_animation_range(0,0),
-	m_animation_speed(0),
-	m_animation_blend(0),
-	m_animation_loop(true),
-	m_animation_sent(false),
-	m_bone_position_sent(false),
-	m_attachment_parent_id(0),
-	m_attachment_sent(false)
+	ServerActiveObject(env, pos)
 {
 	// Initialize something to armor groups
 	m_armor_groups["fleshy"] = 100;
@@ -239,16 +227,7 @@ LuaEntitySAO::LuaEntitySAO(ServerEnvironment *env, v3f pos,
 		const std::string &name, const std::string &state):
 	UnitSAO(env, pos),
 	m_init_name(name),
-	m_init_state(state),
-	m_registered(false),
-	m_velocity(0,0,0),
-	m_acceleration(0,0,0),
-	m_last_sent_yaw(0),
-	m_last_sent_position(0,0,0),
-	m_last_sent_velocity(0,0,0),
-	m_last_sent_position_timer(0),
-	m_last_sent_move_precision(0),
-	m_current_texture_modifier("")
+	m_init_state(state)
 {
 	// Only register type if no environment supplied
 	if(env == NULL){
@@ -783,29 +762,7 @@ PlayerSAO::PlayerSAO(ServerEnvironment *env_, RemotePlayer *player_, u16 peer_id
 	UnitSAO(env_, v3f(0,0,0)),
 	m_player(player_),
 	m_peer_id(peer_id_),
-	m_inventory(NULL),
-	m_damage(0),
-	m_last_good_position(0,0,0),
-	m_time_from_last_teleport(0),
-	m_time_from_last_punch(0),
-	m_nocheat_dig_pos(32767, 32767, 32767),
-	m_nocheat_dig_time(0),
-	m_wield_index(0),
-	m_position_not_sent(false),
-	m_is_singleplayer(is_singleplayer),
-	m_breath(PLAYER_MAX_BREATH),
-	m_pitch(0),
-	m_fov(0),
-	m_wanted_range(0),
-	m_extended_attributes_modified(false),
-	// public
-	m_physics_override_speed(1),
-	m_physics_override_jump(1),
-	m_physics_override_gravity(1),
-	m_physics_override_sneak(true),
-	m_physics_override_sneak_glitch(false),
-	m_physics_override_new_move(true),
-	m_physics_override_sent(false)
+	m_is_singleplayer(is_singleplayer)
 {
 	assert(m_peer_id != 0);	// pre-condition
 
diff --git a/src/content_sao.h b/src/content_sao.h
index bb1a61a19..0a1ae5ecf 100644
--- a/src/content_sao.h
+++ b/src/content_sao.h
@@ -24,6 +24,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "serverobject.h"
 #include "itemgroup.h"
 #include "object_properties.h"
+#include "constants.h"
 
 class UnitSAO: public ServerActiveObject
 {
@@ -56,31 +57,31 @@ public:
 	ObjectProperties* accessObjectProperties();
 	void notifyObjectPropertiesModified();
 protected:
-	s16 m_hp;
-	float m_yaw;
+	s16 m_hp = -1;
+	float m_yaw = 0.0f;
 
-	bool m_properties_sent;
+	bool m_properties_sent = true;
 	struct ObjectProperties m_prop;
 
 	ItemGroupList m_armor_groups;
-	bool m_armor_groups_sent;
+	bool m_armor_groups_sent = false;
 
 	v2f m_animation_range;
-	float m_animation_speed;
-	float m_animation_blend;
-	bool m_animation_loop;
-	bool m_animation_sent;
+	float m_animation_speed = 0.0f;
+	float m_animation_blend = 0.0f;
+	bool m_animation_loop = true;
+	bool m_animation_sent = false;
 
 	// Stores position and rotation for each bone name
 	std::unordered_map<std::string, core::vector2d<v3f>> m_bone_position;
-	bool m_bone_position_sent;
+	bool m_bone_position_sent = false;
 
-	int m_attachment_parent_id;
+	int m_attachment_parent_id = 0;
 	std::unordered_set<int> m_attachment_child_ids;
-	std::string m_attachment_bone;
+	std::string m_attachment_bone = "";
 	v3f m_attachment_position;
 	v3f m_attachment_rotation;
-	bool m_attachment_sent;
+	bool m_attachment_sent = false;
 };
 
 /*
@@ -133,17 +134,17 @@ private:
 
 	std::string m_init_name;
 	std::string m_init_state;
-	bool m_registered;
+	bool m_registered = false;
 
 	v3f m_velocity;
 	v3f m_acceleration;
 
-	float m_last_sent_yaw;
+	float m_last_sent_yaw = 0.0f;
 	v3f m_last_sent_position;
 	v3f m_last_sent_velocity;
-	float m_last_sent_position_timer;
-	float m_last_sent_move_precision;
-	std::string m_current_texture_modifier;
+	float m_last_sent_position_timer = 0.0f;
+	float m_last_sent_move_precision = 0.0f;
+	std::string m_current_texture_modifier = "";
 };
 
 /*
@@ -152,11 +153,10 @@ private:
 
 class LagPool
 {
-	float m_pool;
-	float m_max;
+	float m_pool = 15.0f;
+	float m_max = 15.0f;
 public:
-	LagPool(): m_pool(15), m_max(15)
-	{}
+	LagPool() {}
 
 	void setMax(float new_max)
 	{
@@ -368,47 +368,47 @@ private:
 	std::string getPropertyPacket();
 	void unlinkPlayerSessionAndSave();
 
-	RemotePlayer *m_player;
-	u16 m_peer_id;
-	Inventory *m_inventory;
-	s16 m_damage;
+	RemotePlayer *m_player = nullptr;
+	u16 m_peer_id = 0;
+	Inventory *m_inventory = nullptr;
+	s16 m_damage = 0;
 
 	// Cheat prevention
 	LagPool m_dig_pool;
 	LagPool m_move_pool;
 	v3f m_last_good_position;
-	float m_time_from_last_teleport;
-	float m_time_from_last_punch;
-	v3s16 m_nocheat_dig_pos;
-	float m_nocheat_dig_time;
+	float m_time_from_last_teleport = 0.0f;
+	float m_time_from_last_punch = 0.0f;
+	v3s16 m_nocheat_dig_pos = v3s16(32767, 32767, 32767);
+	float m_nocheat_dig_time = 0.0f;
 
 	// Timers
 	IntervalLimiter m_breathing_interval;
 	IntervalLimiter m_drowning_interval;
 	IntervalLimiter m_node_hurt_interval;
 
-	int m_wield_index;
-	bool m_position_not_sent;
+	int m_wield_index = 0;
+	bool m_position_not_sent = false;
 
 	// Cached privileges for enforcement
 	std::set<std::string> m_privs;
 	bool m_is_singleplayer;
 
-	u16 m_breath;
-	f32 m_pitch;
-	f32 m_fov;
-	s16 m_wanted_range;
+	u16 m_breath = PLAYER_MAX_BREATH;
+	f32 m_pitch = 0.0f;
+	f32 m_fov = 0.0f;
+	s16 m_wanted_range = 0.0f;
 
 	PlayerAttributes m_extra_attributes;
-	bool m_extended_attributes_modified;
+	bool m_extended_attributes_modified = false;
 public:
-	float m_physics_override_speed;
-	float m_physics_override_jump;
-	float m_physics_override_gravity;
-	bool m_physics_override_sneak;
-	bool m_physics_override_sneak_glitch;
-	bool m_physics_override_new_move;
-	bool m_physics_override_sent;
+	float m_physics_override_speed = 1.0f;
+	float m_physics_override_jump = 1.0f;
+	float m_physics_override_gravity = 1.0f;
+	bool m_physics_override_sneak = true;
+	bool m_physics_override_sneak_glitch = false;
+	bool m_physics_override_new_move = true;
+	bool m_physics_override_sent = false;
 };
 
 #endif
diff --git a/src/craftdef.h b/src/craftdef.h
index bdd741f7c..fddff6cef 100644
--- a/src/craftdef.h
+++ b/src/craftdef.h
@@ -70,17 +70,17 @@ const int craft_hash_type_max = (int) CRAFT_HASH_TYPE_UNHASHED;
 */
 struct CraftInput
 {
-	CraftMethod method;
-	unsigned int width;
+	CraftMethod method = CRAFT_METHOD_NORMAL;
+	unsigned int width = 0;
 	std::vector<ItemStack> items;
 
-	CraftInput():
-		method(CRAFT_METHOD_NORMAL), width(0), items()
-	{}
+	CraftInput() {}
+
 	CraftInput(CraftMethod method_, unsigned int width_,
 			const std::vector<ItemStack> &items_):
 		method(method_), width(width_), items(items_)
 	{}
+
 	std::string dump() const;
 };
 
@@ -90,13 +90,12 @@ struct CraftInput
 struct CraftOutput
 {
 	// Used for normal crafting and cooking, itemstring
-	std::string item;
+	std::string item = "";
 	// Used for cooking (cook time) and fuel (burn time), seconds
-	float time;
+	float time = 0.0f;
+
+	CraftOutput() {}
 
-	CraftOutput():
-		item(""), time(0)
-	{}
 	CraftOutput(const std::string &item_, float time_):
 		item(item_), time(time_)
 	{}
@@ -171,16 +170,15 @@ public:
 class CraftDefinitionShaped: public CraftDefinition
 {
 public:
-	CraftDefinitionShaped():
-		output(""), width(1), recipe(), hash_inited(false), replacements()
-	{}
+	CraftDefinitionShaped() {}
+
 	CraftDefinitionShaped(
 			const std::string &output_,
 			unsigned int width_,
 			const std::vector<std::string> &recipe_,
 			const CraftReplacements &replacements_):
 		output(output_), width(width_), recipe(recipe_),
-		hash_inited(false), replacements(replacements_)
+		replacements(replacements_)
 	{}
 	virtual ~CraftDefinitionShaped(){}
 
@@ -200,15 +198,15 @@ public:
 
 private:
 	// Output itemstring
-	std::string output;
+	std::string output = "";
 	// Width of recipe
-	unsigned int width;
+	unsigned int width = 1;
 	// Recipe matrix (itemstrings)
 	std::vector<std::string> recipe;
 	// Recipe matrix (item names)
 	std::vector<std::string> recipe_names;
 	// bool indicating if initHash has been called already
-	bool hash_inited;
+	bool hash_inited = false;
 	// Replacement items for decrementInput()
 	CraftReplacements replacements;
 };
diff --git a/src/database-postgresql.cpp b/src/database-postgresql.cpp
index a6b62bad5..ac25afd48 100644
--- a/src/database-postgresql.cpp
+++ b/src/database-postgresql.cpp
@@ -43,9 +43,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "remoteplayer.h"
 
 Database_PostgreSQL::Database_PostgreSQL(const std::string &connect_string) :
-	m_connect_string(connect_string),
-	m_conn(NULL),
-	m_pgversion(0)
+	m_connect_string(connect_string)
 {
 	if (m_connect_string.empty()) {
 		throw SettingNotFoundException(
diff --git a/src/database-postgresql.h b/src/database-postgresql.h
index d6f208fd9..8bb72ec6a 100644
--- a/src/database-postgresql.h
+++ b/src/database-postgresql.h
@@ -104,8 +104,8 @@ private:
 
 	// Attributes
 	std::string m_connect_string;
-	PGconn *m_conn;
-	int m_pgversion;
+	PGconn *m_conn = nullptr;
+	int m_pgversion = 0;
 };
 
 class MapDatabasePostgreSQL : private Database_PostgreSQL, public MapDatabase
diff --git a/src/database-redis.h b/src/database-redis.h
index fa15dd8a7..1e7909f85 100644
--- a/src/database-redis.h
+++ b/src/database-redis.h
@@ -45,8 +45,8 @@ public:
 	void listAllLoadableBlocks(std::vector<v3s16> &dst);
 
 private:
-	redisContext *ctx;
-	std::string hash;
+	redisContext *ctx = nullptr;
+	std::string hash = "";
 };
 
 #endif // USE_REDIS
diff --git a/src/database-sqlite3.cpp b/src/database-sqlite3.cpp
index 7bc87a7d0..22765c8d2 100644
--- a/src/database-sqlite3.cpp
+++ b/src/database-sqlite3.cpp
@@ -114,12 +114,8 @@ int Database_SQLite3::busyHandler(void *data, int count)
 
 
 Database_SQLite3::Database_SQLite3(const std::string &savedir, const std::string &dbname) :
-	m_database(NULL),
-	m_initialized(false),
 	m_savedir(savedir),
-	m_dbname(dbname),
-	m_stmt_begin(NULL),
-	m_stmt_end(NULL)
+	m_dbname(dbname)
 {
 }
 
@@ -203,13 +199,8 @@ Database_SQLite3::~Database_SQLite3()
 
 MapDatabaseSQLite3::MapDatabaseSQLite3(const std::string &savedir):
 	Database_SQLite3(savedir, "map"),
-	MapDatabase(),
-	m_stmt_read(NULL),
-	m_stmt_write(NULL),
-	m_stmt_list(NULL),
-	m_stmt_delete(NULL)
+	MapDatabase()
 {
-
 }
 
 MapDatabaseSQLite3::~MapDatabaseSQLite3()
@@ -334,24 +325,10 @@ void MapDatabaseSQLite3::listAllLoadableBlocks(std::vector<v3s16> &dst)
 
 PlayerDatabaseSQLite3::PlayerDatabaseSQLite3(const std::string &savedir):
 	Database_SQLite3(savedir, "players"),
-	PlayerDatabase(),
-	m_stmt_player_load(NULL),
-	m_stmt_player_add(NULL),
-	m_stmt_player_update(NULL),
-	m_stmt_player_remove(NULL),
-	m_stmt_player_list(NULL),
-	m_stmt_player_load_inventory(NULL),
-	m_stmt_player_load_inventory_items(NULL),
-	m_stmt_player_add_inventory(NULL),
-	m_stmt_player_add_inventory_items(NULL),
-	m_stmt_player_remove_inventory(NULL),
-	m_stmt_player_remove_inventory_items(NULL),
-	m_stmt_player_metadata_load(NULL),
-	m_stmt_player_metadata_remove(NULL),
-	m_stmt_player_metadata_add(NULL)
+	PlayerDatabase()
 {
-
 }
+
 PlayerDatabaseSQLite3::~PlayerDatabaseSQLite3()
 {
 	FINALIZE_STATEMENT(m_stmt_player_load)
diff --git a/src/database-sqlite3.h b/src/database-sqlite3.h
index 3244facc9..ec7a34ad7 100644
--- a/src/database-sqlite3.h
+++ b/src/database-sqlite3.h
@@ -113,18 +113,18 @@ protected:
 	virtual void createDatabase() = 0;
 	virtual void initStatements() = 0;
 
-	sqlite3 *m_database;
+	sqlite3 *m_database = nullptr;
 private:
 	// Open the database
 	void openDatabase();
 
-	bool m_initialized;
+	bool m_initialized = false;
 
-	std::string m_savedir;
-	std::string m_dbname;
+	std::string m_savedir = "";
+	std::string m_dbname = "";
 
-	sqlite3_stmt *m_stmt_begin;
-	sqlite3_stmt *m_stmt_end;
+	sqlite3_stmt *m_stmt_begin = nullptr;
+	sqlite3_stmt *m_stmt_end = nullptr;
 
 	s64 m_busy_handler_data[2];
 
@@ -152,10 +152,10 @@ private:
 	void bindPos(sqlite3_stmt *stmt, const v3s16 &pos, int index = 1);
 
 	// Map
-	sqlite3_stmt *m_stmt_read;
-	sqlite3_stmt *m_stmt_write;
-	sqlite3_stmt *m_stmt_list;
-	sqlite3_stmt *m_stmt_delete;
+	sqlite3_stmt *m_stmt_read = nullptr;
+	sqlite3_stmt *m_stmt_write = nullptr;
+	sqlite3_stmt *m_stmt_list = nullptr;
+	sqlite3_stmt *m_stmt_delete = nullptr;
 };
 
 class PlayerDatabaseSQLite3 : private Database_SQLite3, public PlayerDatabase
@@ -177,20 +177,20 @@ private:
 	bool playerDataExists(const std::string &name);
 
 	// Players
-	sqlite3_stmt *m_stmt_player_load;
-	sqlite3_stmt *m_stmt_player_add;
-	sqlite3_stmt *m_stmt_player_update;
-	sqlite3_stmt *m_stmt_player_remove;
-	sqlite3_stmt *m_stmt_player_list;
-	sqlite3_stmt *m_stmt_player_load_inventory;
-	sqlite3_stmt *m_stmt_player_load_inventory_items;
-	sqlite3_stmt *m_stmt_player_add_inventory;
-	sqlite3_stmt *m_stmt_player_add_inventory_items;
-	sqlite3_stmt *m_stmt_player_remove_inventory;
-	sqlite3_stmt *m_stmt_player_remove_inventory_items;
-	sqlite3_stmt *m_stmt_player_metadata_load;
-	sqlite3_stmt *m_stmt_player_metadata_remove;
-	sqlite3_stmt *m_stmt_player_metadata_add;
+	sqlite3_stmt *m_stmt_player_load = nullptr;
+	sqlite3_stmt *m_stmt_player_add = nullptr;
+	sqlite3_stmt *m_stmt_player_update = nullptr;
+	sqlite3_stmt *m_stmt_player_remove = nullptr;
+	sqlite3_stmt *m_stmt_player_list = nullptr;
+	sqlite3_stmt *m_stmt_player_load_inventory = nullptr;
+	sqlite3_stmt *m_stmt_player_load_inventory_items = nullptr;
+	sqlite3_stmt *m_stmt_player_add_inventory = nullptr;
+	sqlite3_stmt *m_stmt_player_add_inventory_items = nullptr;
+	sqlite3_stmt *m_stmt_player_remove_inventory = nullptr;
+	sqlite3_stmt *m_stmt_player_remove_inventory_items = nullptr;
+	sqlite3_stmt *m_stmt_player_metadata_load = nullptr;
+	sqlite3_stmt *m_stmt_player_metadata_remove = nullptr;
+	sqlite3_stmt *m_stmt_player_metadata_add = nullptr;
 };
 
 #endif
diff --git a/src/debug.cpp b/src/debug.cpp
index 86b727812..a30d6a95f 100644
--- a/src/debug.cpp
+++ b/src/debug.cpp
@@ -144,10 +144,6 @@ void DebugStack::print(std::ostream &os, bool everything)
 std::map<std::thread::id, DebugStack*> g_debug_stacks;
 std::mutex g_debug_stacks_mutex;
 
-void debug_stacks_init()
-{
-}
-
 void debug_stacks_print_to(std::ostream &os)
 {
 	MutexAutoLock lock(g_debug_stacks_mutex);
diff --git a/src/debug.h b/src/debug.h
index 2098942db..415797f43 100644
--- a/src/debug.h
+++ b/src/debug.h
@@ -92,7 +92,6 @@ void debug_set_exception_handler();
 #define DEBUG_STACK_SIZE 50
 #define DEBUG_STACK_TEXT_SIZE 300
 
-extern void debug_stacks_init();
 extern void debug_stacks_print_to(std::ostream &os);
 extern void debug_stacks_print();
 
diff --git a/src/emerge.cpp b/src/emerge.cpp
index 053f4dd45..f5852aaae 100644
--- a/src/emerge.cpp
+++ b/src/emerge.cpp
@@ -96,12 +96,10 @@ EmergeManager::EmergeManager(Server *server)
 	this->oremgr    = new OreManager(server);
 	this->decomgr   = new DecorationManager(server);
 	this->schemmgr  = new SchematicManager(server);
-	this->gen_notify_on = 0;
 
 	// Note that accesses to this variable are not synchronized.
 	// This is because the *only* thread ever starting or stopping
 	// EmergeThreads should be the ServerThread.
-	this->m_threads_active = false;
 
 	enable_mapgen_debug_info = g_settings->getBool("enable_mapgen_debug_info");
 
diff --git a/src/emerge.h b/src/emerge.h
index cf014a9e8..cf0a27d63 100644
--- a/src/emerge.h
+++ b/src/emerge.h
@@ -47,20 +47,15 @@ class Server;
 
 // Structure containing inputs/outputs for chunk generation
 struct BlockMakeData {
-	MMVManip *vmanip;
-	u64 seed;
+	MMVManip *vmanip = nullptr;
+	u64 seed = 0;
 	v3s16 blockpos_min;
 	v3s16 blockpos_max;
 	v3s16 blockpos_requested;
 	UniqueQueue<v3s16> transforming_liquid;
-	INodeDefManager *nodedef;
-
-	BlockMakeData():
-		vmanip(NULL),
-		seed(0),
-		nodedef(NULL)
-	{}
+	INodeDefManager *nodedef = nullptr;
 
+	BlockMakeData() {}
 	~BlockMakeData() { delete vmanip; }
 };
 
@@ -96,7 +91,7 @@ public:
 	bool enable_mapgen_debug_info;
 
 	// Generation Notify
-	u32 gen_notify_on;
+	u32 gen_notify_on = 0;
 	std::set<u32> gen_notify_on_deco_ids;
 
 	// Parameters passed to mapgens owned by ServerMap
@@ -154,7 +149,7 @@ public:
 private:
 	std::vector<Mapgen *> m_mapgens;
 	std::vector<EmergeThread *> m_threads;
-	bool m_threads_active;
+	bool m_threads_active = false;
 
 	std::mutex m_queue_mutex;
 	std::map<v3s16, BlockEmergeData> m_blocks_enqueued;
diff --git a/src/environment.cpp b/src/environment.cpp
index 4e782db81..3a6d1b787 100644
--- a/src/environment.cpp
+++ b/src/environment.cpp
@@ -28,13 +28,9 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 
 
 Environment::Environment(IGameDef *gamedef):
-	m_time_of_day_speed(0),
-	m_time_of_day(9000),
-	m_time_of_day_f(9000./24000),
-	m_time_conversion_skew(0.0f),
-	m_enable_day_night_ratio_override(false),
-	m_day_night_ratio_override(0.0f),
-	m_gamedef(gamedef)
+	m_gamedef(gamedef),
+	m_time_of_day_speed(0.0f),
+	m_day_count(0)
 {
 	m_cache_enable_shaders = g_settings->getBool("enable_shaders");
 	m_cache_active_block_mgmt_interval = g_settings->getFloat("active_block_mgmt_interval");
diff --git a/src/environment.h b/src/environment.h
index 55fc4707c..11c2533ca 100644
--- a/src/environment.h
+++ b/src/environment.h
@@ -88,15 +88,15 @@ protected:
 	 * Below: values managed by m_time_lock
 	*/
 	// Time of day in milli-hours (0-23999); determines day and night
-	u32 m_time_of_day;
+	u32 m_time_of_day = 9000;
 	// Time of day in 0...1
-	float m_time_of_day_f;
+	float m_time_of_day_f = 9000.0f / 24000.0f;
 	// Stores the skew created by the float -> u32 conversion
 	// to be applied at next conversion, so that there is no real skew.
-	float m_time_conversion_skew;
+	float m_time_conversion_skew = 0.0f;
 	// Overriding the day-night ratio is useful for custom sky visuals
-	bool m_enable_day_night_ratio_override;
-	u32 m_day_night_ratio_override;
+	bool m_enable_day_night_ratio_override = false;
+	u32 m_day_night_ratio_override = 0.0f;
 	// Days from the server start, accounts for time shift
 	// in game (e.g. /time or bed usage)
 	std::atomic<u32> m_day_count;
diff --git a/src/event.h b/src/event.h
index cfc222d5d..7ab139b59 100644
--- a/src/event.h
+++ b/src/event.h
@@ -23,7 +23,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 class MtEvent
 {
 public:
-	virtual ~MtEvent(){};
+	virtual ~MtEvent() {};
 	//virtual MtEvent* clone(){ return new IEvent; }
 	virtual const char* getType() const = 0;
 
diff --git a/src/exceptions.h b/src/exceptions.h
index 1b39c6725..07fecdaf7 100644
--- a/src/exceptions.h
+++ b/src/exceptions.h
@@ -37,16 +37,6 @@ protected:
 	std::string m_s;
 };
 
-class AsyncQueuedException : public BaseException {
-public:
-	AsyncQueuedException(const std::string &s): BaseException(s) {}
-};
-
-class NotImplementedException : public BaseException {
-public:
-	NotImplementedException(const std::string &s): BaseException(s) {}
-};
-
 class AlreadyExistsException : public BaseException {
 public:
 	AlreadyExistsException(const std::string &s): BaseException(s) {}
@@ -77,16 +67,6 @@ public:
 	PacketError(const std::string &s): BaseException(s) {}
 };
 
-class LoadError : public BaseException {
-public:
-	LoadError(const std::string &s): BaseException(s) {}
-};
-
-class ContainerFullException : public BaseException {
-public:
-	ContainerFullException(const std::string &s): BaseException(s) {}
-};
-
 class SettingNotFoundException : public BaseException {
 public:
 	SettingNotFoundException(const std::string &s): BaseException(s) {}
@@ -97,16 +77,6 @@ public:
 	InvalidFilenameException(const std::string &s): BaseException(s) {}
 };
 
-class ProcessingLimitException : public BaseException {
-public:
-	ProcessingLimitException(const std::string &s): BaseException(s) {}
-};
-
-class CommandLineError : public BaseException {
-public:
-	CommandLineError(const std::string &s): BaseException(s) {}
-};
-
 class ItemNotFoundException : public BaseException {
 public:
 	ItemNotFoundException(const std::string &s): BaseException(s) {}
@@ -160,21 +130,5 @@ public:
 	{}
 };
 
-class TargetInexistentException : public std::exception
-{
-	virtual const char * what() const throw()
-	{
-		return "Somebody tried to refer to something that doesn't exist.";
-	}
-};
-
-class NullPointerException : public std::exception
-{
-	virtual const char * what() const throw()
-	{
-		return "NullPointerException";
-	}
-};
-
 #endif
 
diff --git a/src/fontengine.cpp b/src/fontengine.cpp
index da327c3f6..2c277a04e 100644
--- a/src/fontengine.cpp
+++ b/src/fontengine.cpp
@@ -43,12 +43,7 @@ static void font_setting_changed(const std::string &name, void *userdata)
 /******************************************************************************/
 FontEngine::FontEngine(Settings* main_settings, gui::IGUIEnvironment* env) :
 	m_settings(main_settings),
-	m_env(env),
-	m_font_cache(),
-	m_currentMode(FM_Standard),
-	m_lastMode(),
-	m_lastSize(0),
-	m_lastFont(NULL)
+	m_env(env)
 {
 
 	for (unsigned int i = 0; i < FM_MaxMode; i++) {
diff --git a/src/fontengine.h b/src/fontengine.h
index 9f7266775..0c97ac77b 100644
--- a/src/fontengine.h
+++ b/src/fontengine.h
@@ -120,16 +120,16 @@ private:
 	unsigned int m_default_size[FM_MaxMode];
 
 	/** current font engine mode */
-	FontMode m_currentMode;
+	FontMode m_currentMode = FM_Standard;
 
 	/** font mode of last request */
 	FontMode m_lastMode;
 
 	/** size of last request */
-	unsigned int m_lastSize;
+	unsigned int m_lastSize = 0;
 
 	/** last font returned */
-	irr::gui::IGUIFont* m_lastFont;
+	irr::gui::IGUIFont* m_lastFont = nullptr;
 
 };
 
diff --git a/src/genericobject.h b/src/genericobject.h
index d82650f0e..d22d7ef07 100644
--- a/src/genericobject.h
+++ b/src/genericobject.h
@@ -23,6 +23,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include <string>
 #include "irrlichttypes_bloated.h"
 #include <iostream>
+#include "itemgroup.h"
 
 enum GenericCMD {
 	GENERIC_CMD_SET_PROPERTIES,
@@ -64,7 +65,6 @@ std::string gob_cmd_set_sprite(
 
 std::string gob_cmd_punched(s16 damage, s16 result_hp);
 
-#include "itemgroup.h"
 std::string gob_cmd_update_armor_groups(const ItemGroupList &armor_groups);
 
 std::string gob_cmd_update_physics_override(float physics_override_speed,
diff --git a/src/guiChatConsole.cpp b/src/guiChatConsole.cpp
index 5bb80bbbe..fe11e730d 100644
--- a/src/guiChatConsole.cpp
+++ b/src/guiChatConsole.cpp
@@ -54,22 +54,7 @@ GUIChatConsole::GUIChatConsole(
 	m_chat_backend(backend),
 	m_client(client),
 	m_menumgr(menumgr),
-	m_screensize(v2u32(0,0)),
-	m_animate_time_old(porting::getTimeMs()),
-	m_open(false),
-	m_close_on_enter(false),
-	m_height(0),
-	m_desired_height(0),
-	m_desired_height_fraction(0.0),
-	m_height_speed(5.0),
-	m_open_inhibited(0),
-	m_cursor_blink(0.0),
-	m_cursor_blink_speed(0.0),
-	m_cursor_height(0.0),
-	m_background(NULL),
-	m_background_color(255, 0, 0, 0),
-	m_font(NULL),
-	m_fontsize(0, 0)
+	m_animate_time_old(porting::getTimeMs())
 {
 	// load background settings
 	s32 console_alpha = g_settings->getS32("console_alpha");
diff --git a/src/guiChatConsole.h b/src/guiChatConsole.h
index 0332678c7..3c39f2da6 100644
--- a/src/guiChatConsole.h
+++ b/src/guiChatConsole.h
@@ -101,35 +101,35 @@ private:
 	u64 m_animate_time_old;
 
 	// should the console be opened or closed?
-	bool m_open;
+	bool m_open = false;
 	// should it close after you press enter?
-	bool m_close_on_enter;
+	bool m_close_on_enter = false;
 	// current console height [pixels]
-	s32 m_height;
+	s32 m_height = 0;
 	// desired height [pixels]
-	f32 m_desired_height;
+	f32 m_desired_height = 0.0f;
 	// desired height [screen height fraction]
-	f32 m_desired_height_fraction;
+	f32 m_desired_height_fraction = 0.0f;
 	// console open/close animation speed [screen height fraction / second]
-	f32 m_height_speed;
+	f32 m_height_speed = 5.0f;
 	// if nonzero, opening the console is inhibited [milliseconds]
-	u32 m_open_inhibited;
+	u32 m_open_inhibited = 0;
 
 	// cursor blink frame (16-bit value)
 	// cursor is off during [0,32767] and on during [32768,65535]
-	u32 m_cursor_blink;
+	u32 m_cursor_blink = 0;
 	// cursor blink speed [on/off toggles / second]
-	f32 m_cursor_blink_speed;
+	f32 m_cursor_blink_speed = 0.0f;
 	// cursor height [line height]
-	f32 m_cursor_height;
+	f32 m_cursor_height = 0.0f;
 
 	// background texture
-	video::ITexture* m_background;
+	video::ITexture *m_background = nullptr;
 	// background color (including alpha)
-	video::SColor m_background_color;
+	video::SColor m_background_color = video::SColor(255, 0, 0, 0);
 
 	// font
-	gui::IGUIFont* m_font;
+	gui::IGUIFont *m_font = nullptr;
 	v2u32 m_fontsize;
 };
 
diff --git a/src/guiEngine.cpp b/src/guiEngine.cpp
index 545187bfc..6363a340a 100644
--- a/src/guiEngine.cpp
+++ b/src/guiEngine.cpp
@@ -142,18 +142,7 @@ GUIEngine::GUIEngine(	irr::IrrlichtDevice* dev,
 	m_menumanager(menumgr),
 	m_smgr(smgr),
 	m_data(data),
-	m_texture_source(NULL),
-	m_sound_manager(NULL),
-	m_formspecgui(0),
-	m_buttonhandler(0),
-	m_menu(0),
-	m_kill(kill),
-	m_startgame(false),
-	m_script(0),
-	m_scriptdir(""),
-	m_irr_toplefttext(0),
-	m_clouds_enabled(true),
-	m_cloud()
+	m_kill(kill)
 {
 	//initialize texture pointers
 	for (unsigned int i = 0; i < TEX_LAYER_MAX; i++) {
diff --git a/src/guiEngine.h b/src/guiEngine.h
index e7e5ca05d..e6cea6b4f 100644
--- a/src/guiEngine.h
+++ b/src/guiEngine.h
@@ -203,28 +203,28 @@ private:
 	/** pointer to data beeing transfered back to main game handling */
 	MainMenuData*            m_data;
 	/** pointer to texture source */
-	ISimpleTextureSource*    m_texture_source;
+	ISimpleTextureSource    *m_texture_source = nullptr;
 	/** pointer to soundmanager*/
-	ISoundManager*           m_sound_manager;
+	ISoundManager           *m_sound_manager = nullptr;
 
 	/** representation of form source to be used in mainmenu formspec */
-	FormspecFormSource*      m_formspecgui;
+	FormspecFormSource      *m_formspecgui = nullptr;
 	/** formspec input receiver */
-	TextDestGuiEngine*       m_buttonhandler;
+	TextDestGuiEngine       *m_buttonhandler = nullptr;
 	/** the formspec menu */
-	GUIFormSpecMenu*         m_menu;
+	GUIFormSpecMenu         *m_menu = nullptr;
 
 	/** reference to kill variable managed by SIGINT handler */
 	bool&                    m_kill;
 
 	/** variable used to abort menu and return back to main game handling */
-	bool                     m_startgame;
+	bool                     m_startgame = false;
 
 	/** scripting interface */
-	MainMenuScripting*       m_script;
+	MainMenuScripting       *m_script = nullptr;
 
 	/** script basefolder */
-	std::string              m_scriptdir;
+	std::string              m_scriptdir = "";
 
 	/**
 	 * draw background layer
@@ -272,7 +272,7 @@ private:
 	void setTopleftText(const std::string &text);
 
 	/** pointer to gui element shown at topleft corner */
-	irr::gui::IGUIStaticText*	m_irr_toplefttext;
+	irr::gui::IGUIStaticText *m_irr_toplefttext = nullptr;
 	/** and text that is in it */
 	EnrichedString m_toplefttext;
 
@@ -296,7 +296,7 @@ private:
 	};
 
 	/** is drawing of clouds enabled atm */
-	bool        m_clouds_enabled;
+	bool        m_clouds_enabled = true;
 	/** data used to draw clouds */
 	clouddata   m_cloud;
 
@@ -308,6 +308,4 @@ private:
 
 };
 
-
-
 #endif /* GUI_ENGINE_H_ */
diff --git a/src/guiFormSpecMenu.cpp b/src/guiFormSpecMenu.cpp
index e73f02e5c..85d9ef48a 100644
--- a/src/guiFormSpecMenu.cpp
+++ b/src/guiFormSpecMenu.cpp
@@ -89,22 +89,9 @@ GUIFormSpecMenu::GUIFormSpecMenu(irr::IrrlichtDevice* dev,
 	m_invmgr(client),
 	m_tsrc(tsrc),
 	m_client(client),
-	m_selected_item(NULL),
-	m_selected_amount(0),
-	m_selected_dragging(false),
-	m_tooltip_element(NULL),
-	m_hovered_time(0),
-	m_old_tooltip_id(-1),
-	m_rmouse_auto_place(false),
-	m_allowclose(true),
-	m_lock(false),
 	m_form_src(fsrc),
 	m_text_dst(tdst),
-	m_formspec_version(0),
-	m_focused_element(""),
 	m_joystick(joystick),
-	current_field_enter_pending(""),
-	m_font(NULL),
 	m_remap_dbl_click(remap_dbl_click)
 #ifdef __ANDROID__
 	, m_JavaDialogFieldName("")
@@ -2629,7 +2616,6 @@ void GUIFormSpecMenu::drawMenu()
 		u64 delta = 0;
 		if (id == -1) {
 			m_old_tooltip_id = id;
-			m_old_tooltip = L"";
 		} else {
 			if (id == m_old_tooltip_id) {
 				delta = porting::getDeltaMs(m_hovered_time, porting::getTimeMs());
@@ -2673,7 +2659,6 @@ void GUIFormSpecMenu::showTooltip(const std::wstring &text,
 {
 	m_tooltip_element->setOverrideColor(color);
 	m_tooltip_element->setBackgroundColor(bgcolor);
-	m_old_tooltip = text;
 	setStaticText(m_tooltip_element, text.c_str());
 
 	// Tooltip size and offset
@@ -3037,7 +3022,6 @@ bool GUIFormSpecMenu::preprocessEvent(const SEvent& event)
 				core::position2d<s32>(x, y));
 		if (event.MouseInput.Event == EMIE_LMOUSE_PRESSED_DOWN) {
 			m_old_tooltip_id = -1;
-			m_old_tooltip = L"";
 		}
 		if (!isChild(hovered,this)) {
 			if (DoubleClickDetection(event)) {
diff --git a/src/guiFormSpecMenu.h b/src/guiFormSpecMenu.h
index d08bb4ab5..66b9b019a 100644
--- a/src/guiFormSpecMenu.h
+++ b/src/guiFormSpecMenu.h
@@ -402,9 +402,9 @@ protected:
 	std::vector<std::pair<FieldSpec,gui::IGUIScrollBar*> > m_scrollbars;
 	std::vector<std::pair<FieldSpec, std::vector<std::string> > > m_dropdowns;
 
-	ItemSpec *m_selected_item;
-	u32 m_selected_amount;
-	bool m_selected_dragging;
+	ItemSpec *m_selected_item = nullptr;
+	u32 m_selected_amount = 0;
+	bool m_selected_dragging = false;
 
 	// WARNING: BLACK MAGIC
 	// Used to guess and keep up with some special things the server can do.
@@ -414,17 +414,16 @@ protected:
 
 	v2s32 m_pointer;
 	v2s32 m_old_pointer;  // Mouse position after previous mouse event
-	gui::IGUIStaticText *m_tooltip_element;
+	gui::IGUIStaticText *m_tooltip_element = nullptr;
 
 	u64 m_tooltip_show_delay;
-	u64 m_hovered_time;
-	s32 m_old_tooltip_id;
-	std::wstring m_old_tooltip;
+	u64 m_hovered_time = 0;
+	s32 m_old_tooltip_id = -1;
 
-	bool m_rmouse_auto_place;
+	bool m_rmouse_auto_place = false;
 
-	bool m_allowclose;
-	bool m_lock;
+	bool m_allowclose = true;
+	bool m_lock = false;
 	v2u32 m_lockscreensize;
 
 	bool m_bgfullscreen;
@@ -439,8 +438,8 @@ protected:
 private:
 	IFormSource        *m_form_src;
 	TextDest           *m_text_dst;
-	unsigned int        m_formspec_version;
-	std::string         m_focused_element;
+	u32                 m_formspec_version = 0;
+	std::string         m_focused_element = "";
 	JoystickController *m_joystick;
 
 	typedef struct {
@@ -467,7 +466,7 @@ private:
 	} fs_key_pendig;
 
 	fs_key_pendig current_keys_pending;
-	std::string current_field_enter_pending;
+	std::string current_field_enter_pending = "";
 
 	void parseElement(parserData* data, const std::string &element);
 
@@ -531,7 +530,7 @@ private:
 	clickpos m_doubleclickdetect[2];
 
 	int m_btn_height;
-	gui::IGUIFont *m_font;
+	gui::IGUIFont *m_font = nullptr;
 
 	std::wstring getLabelByID(s32 id);
 	std::string getNameByID(s32 id);