diff --git a/core/bind/core_bind.cpp b/core/bind/core_bind.cpp
index c0387ec59f5f..27112747a1a9 100644
--- a/core/bind/core_bind.cpp
+++ b/core/bind/core_bind.cpp
@@ -2564,6 +2564,8 @@ void _Directory::_bind_methods() {
 _Directory::_Directory() {
 
 	d = DirAccess::create(DirAccess::ACCESS_RESOURCES);
+	_list_skip_hidden = false;
+	_list_skip_navigational = false;
 }
 
 _Directory::~_Directory() {
diff --git a/core/class_db.cpp b/core/class_db.cpp
index 08c4d4b80b44..8e6a7a3b2ddb 100644
--- a/core/class_db.cpp
+++ b/core/class_db.cpp
@@ -265,6 +265,7 @@ ClassDB::ClassInfo::ClassInfo() {
 	inherits_ptr = NULL;
 	disabled = false;
 	exposed = false;
+	class_ptr = NULL;
 }
 
 ClassDB::ClassInfo::~ClassInfo() {
diff --git a/core/crypto/hashing_context.cpp b/core/crypto/hashing_context.cpp
index e7e13b600546..50cfaac53186 100644
--- a/core/crypto/hashing_context.cpp
+++ b/core/crypto/hashing_context.cpp
@@ -129,6 +129,7 @@ void HashingContext::_bind_methods() {
 }
 
 HashingContext::HashingContext() {
+	type = HASH_MD5;
 	ctx = NULL;
 }
 
diff --git a/core/engine.cpp b/core/engine.cpp
index 5dc10295bb12..63aa5f137421 100644
--- a/core/engine.cpp
+++ b/core/engine.cpp
@@ -234,6 +234,7 @@ Engine::Engine() {
 	_in_physics = false;
 	_frame_ticks = 0;
 	_frame_step = 0;
+	_snap_2d_viewports = false;
 	editor_hint = false;
 }
 
diff --git a/core/io/file_access_compressed.cpp b/core/io/file_access_compressed.cpp
index 1479f60d012e..dd1d0650811a 100644
--- a/core/io/file_access_compressed.cpp
+++ b/core/io/file_access_compressed.cpp
@@ -392,6 +392,7 @@ Error FileAccessCompressed::_set_unix_permissions(const String &p_file, uint32_t
 FileAccessCompressed::FileAccessCompressed() :
 		cmode(Compression::MODE_ZSTD),
 		writing(false),
+		write_pos(0),
 		write_ptr(0),
 		write_buffer_size(0),
 		write_max(0),
diff --git a/core/io/file_access_encrypted.cpp b/core/io/file_access_encrypted.cpp
index fe08e76744d9..61b734197b8f 100644
--- a/core/io/file_access_encrypted.cpp
+++ b/core/io/file_access_encrypted.cpp
@@ -324,6 +324,8 @@ FileAccessEncrypted::FileAccessEncrypted() {
 	eofed = false;
 	mode = MODE_MAX;
 	writing = false;
+	base = 0;
+	length = 0;
 }
 
 FileAccessEncrypted::~FileAccessEncrypted() {
diff --git a/core/io/file_access_memory.cpp b/core/io/file_access_memory.cpp
index a60b643d0e7e..d8bf5fbd5bd5 100644
--- a/core/io/file_access_memory.cpp
+++ b/core/io/file_access_memory.cpp
@@ -197,4 +197,6 @@ void FileAccessMemory::store_buffer(const uint8_t *p_src, int p_length) {
 FileAccessMemory::FileAccessMemory() {
 
 	data = NULL;
+	length = 0;
+	pos = 0;
 }
diff --git a/core/io/http_client.cpp b/core/io/http_client.cpp
index 3954f50f7a51..25fc2943baa4 100644
--- a/core/io/http_client.cpp
+++ b/core/io/http_client.cpp
@@ -781,6 +781,7 @@ HTTPClient::HTTPClient() {
 	handshaking = false;
 	// 64 KiB by default (favors fast download speeds at the cost of memory usage).
 	read_chunk_size = 65536;
+	ssl_verify_host = false;
 }
 
 HTTPClient::~HTTPClient() {
diff --git a/core/io/pck_packer.cpp b/core/io/pck_packer.cpp
index 45e29ca35441..6c4cce6a9629 100644
--- a/core/io/pck_packer.cpp
+++ b/core/io/pck_packer.cpp
@@ -181,7 +181,7 @@ Error PCKPacker::flush(bool p_verbose) {
 };
 
 PCKPacker::PCKPacker() {
-
+	alignment = 0;
 	file = NULL;
 };
 
diff --git a/core/io/resource_format_binary.cpp b/core/io/resource_format_binary.cpp
index 91691a48d19d..7cb2ed6ac535 100644
--- a/core/io/resource_format_binary.cpp
+++ b/core/io/resource_format_binary.cpp
@@ -980,6 +980,8 @@ ResourceInteractiveLoaderBinary::ResourceInteractiveLoaderBinary() :
 		f(NULL),
 		error(OK),
 		stage(0) {
+	ver_format = 0;
+	importmd_ofs = 0;
 }
 
 ResourceInteractiveLoaderBinary::~ResourceInteractiveLoaderBinary() {
diff --git a/core/math/a_star.h b/core/math/a_star.h
index 01b9ff954012..df6416c3ab7f 100644
--- a/core/math/a_star.h
+++ b/core/math/a_star.h
@@ -48,8 +48,13 @@ class AStar : public Reference {
 	struct Point {
 
 		Point() :
+				id(0),
+				enabled(false),
 				neighbours(4u),
-				unlinked_neighbours(4u) {}
+				unlinked_neighbours(4u),
+				prev_point(NULL),
+				open_pass(0),
+				closed_pass(0) {}
 
 		int id;
 		Vector3 pos;
diff --git a/core/math/expression.cpp b/core/math/expression.cpp
index e53538aad8c5..bfd020c1ad15 100644
--- a/core/math/expression.cpp
+++ b/core/math/expression.cpp
@@ -2230,6 +2230,8 @@ Expression::Expression() :
 		root(NULL),
 		nodes(NULL),
 		execution_error(false) {
+	str_ofs = 0;
+	expression_dirty = false;
 }
 
 Expression::~Expression() {
diff --git a/core/math/expression.h b/core/math/expression.h
index 0b0cec60c4f1..815450b3db68 100644
--- a/core/math/expression.h
+++ b/core/math/expression.h
@@ -220,7 +220,10 @@ class Expression : public Reference {
 
 		Type type;
 
-		ENode() { next = NULL; }
+		ENode() {
+			type = TYPE_INPUT;
+			next = NULL;
+		}
 		virtual ~ENode() {
 			if (next) {
 				memdelete(next);
@@ -243,6 +246,7 @@ class Expression : public Reference {
 
 		int index;
 		InputNode() {
+			index = 0;
 			type = TYPE_INPUT;
 		}
 	};
@@ -262,6 +266,8 @@ class Expression : public Reference {
 		ENode *nodes[2];
 
 		OperatorNode() {
+			nodes[0] = nullptr;
+			nodes[1] = nullptr;
 			type = TYPE_OPERATOR;
 		}
 	};
@@ -278,6 +284,8 @@ class Expression : public Reference {
 		ENode *index;
 
 		IndexNode() {
+			base = nullptr;
+			index = nullptr;
 			type = TYPE_INDEX;
 		}
 	};
@@ -287,6 +295,7 @@ class Expression : public Reference {
 		StringName name;
 
 		NamedIndexNode() {
+			base = nullptr;
 			type = TYPE_NAMED_INDEX;
 		}
 	};
@@ -306,6 +315,7 @@ class Expression : public Reference {
 		Vector<ENode *> arguments;
 
 		CallNode() {
+			base = nullptr;
 			type = TYPE_CALL;
 		}
 	};
@@ -328,6 +338,7 @@ class Expression : public Reference {
 		BuiltinFunc func;
 		Vector<ENode *> arguments;
 		BuiltinFuncNode() {
+			func = BuiltinFunc::BYTES_TO_VAR;
 			type = TYPE_BUILTIN_FUNC;
 		}
 	};
diff --git a/core/object.h b/core/object.h
index b0d1e9505b83..ea32cf644f18 100644
--- a/core/object.h
+++ b/core/object.h
@@ -465,7 +465,10 @@ class Object {
 			int reference_count;
 			Connection conn;
 			List<Connection>::Element *cE;
-			Slot() { reference_count = 0; }
+			Slot() {
+				cE = nullptr;
+				reference_count = 0;
+			}
 		};
 
 		MethodInfo user;
diff --git a/core/os/dir_access.cpp b/core/os/dir_access.cpp
index 2f40cf34c6b0..2d63a8bd45c7 100644
--- a/core/os/dir_access.cpp
+++ b/core/os/dir_access.cpp
@@ -446,7 +446,7 @@ bool DirAccess::exists(String p_dir) {
 }
 
 DirAccess::DirAccess() {
-
+	next_is_dir = false;
 	_access_type = ACCESS_FILESYSTEM;
 }
 
diff --git a/core/packed_data_container.cpp b/core/packed_data_container.cpp
index 3fcdf37b806f..baa14b6452aa 100644
--- a/core/packed_data_container.cpp
+++ b/core/packed_data_container.cpp
@@ -428,4 +428,5 @@ int PackedDataContainerRef::size() const {
 };
 
 PackedDataContainerRef::PackedDataContainerRef() {
+	offset = 0;
 }
diff --git a/core/script_debugger_local.cpp b/core/script_debugger_local.cpp
index 3cc14daf4c21..27c1d2b51ae9 100644
--- a/core/script_debugger_local.cpp
+++ b/core/script_debugger_local.cpp
@@ -418,6 +418,10 @@ void ScriptDebuggerLocal::send_error(const String &p_func, const String &p_file,
 
 ScriptDebuggerLocal::ScriptDebuggerLocal() {
 
+	frame_time = 0;
+	idle_time = 0;
+	physics_time = 0;
+	physics_frame_time = 0;
 	profiling = false;
 	idle_accum = OS::get_singleton()->get_ticks_usec();
 	options["variable_prefix"] = "";
diff --git a/drivers/alsa/audio_driver_alsa.cpp b/drivers/alsa/audio_driver_alsa.cpp
index 9f310fcae2aa..d0270aa5941b 100644
--- a/drivers/alsa/audio_driver_alsa.cpp
+++ b/drivers/alsa/audio_driver_alsa.cpp
@@ -343,6 +343,11 @@ AudioDriverALSA::AudioDriverALSA() :
 		pcm_handle(NULL),
 		device_name("Default"),
 		new_device("Default") {
+	mix_rate = 0;
+	channels = 0;
+	active = 0;
+	thread_exited = false;
+	exit_thread = false;
 }
 
 AudioDriverALSA::~AudioDriverALSA() {
diff --git a/drivers/gles2/rasterizer_storage_gles2.h b/drivers/gles2/rasterizer_storage_gles2.h
index 85ade9f21ca4..0f911f6a517d 100644
--- a/drivers/gles2/rasterizer_storage_gles2.h
+++ b/drivers/gles2/rasterizer_storage_gles2.h
@@ -172,6 +172,7 @@ class RasterizerStorageGLES2 : public RasterizerStorage {
 				vertex_mem(0) {
 			render.reset();
 			render_final.reset();
+			snap.reset();
 		}
 
 	} info;
@@ -229,6 +230,7 @@ class RasterizerStorageGLES2 : public RasterizerStorage {
 		virtual void material_changed_notify() {}
 
 		Geometry() {
+			type = GEOMETRY_INVALID;
 			last_pass = 0;
 			index = 0;
 		}
@@ -296,6 +298,7 @@ class RasterizerStorageGLES2 : public RasterizerStorage {
 				flags(0),
 				width(0),
 				height(0),
+				depth(0),
 				alloc_width(0),
 				alloc_height(0),
 				format(Image::FORMAT_L8),
@@ -305,6 +308,7 @@ class RasterizerStorageGLES2 : public RasterizerStorage {
 				total_data_size(0),
 				ignore_mipmaps(false),
 				compressed(false),
+				srgb(false),
 				mipmaps(0),
 				resize_to_po2(false),
 				active(false),
@@ -532,6 +536,10 @@ class RasterizerStorageGLES2 : public RasterizerStorage {
 			custom_code_id = 0;
 			version = 1;
 			last_pass = 0;
+			texture_count = 0;
+			index = 0;
+			uses_vertex_time = false;
+			uses_fragment_time = false;
 		}
 	};
 
@@ -588,6 +596,7 @@ class RasterizerStorageGLES2 : public RasterizerStorage {
 			line_width = 1.0;
 			last_pass = 0;
 			render_priority = 0;
+			index = 0;
 		}
 	};
 
@@ -688,6 +697,8 @@ class RasterizerStorageGLES2 : public RasterizerStorage {
 				primitive(VS::PRIMITIVE_POINTS),
 				active(false),
 				total_data_size(0) {
+			format = 0;
+			max_bone = 0;
 		}
 	};
 
@@ -720,6 +731,8 @@ class RasterizerStorageGLES2 : public RasterizerStorage {
 		Mesh() :
 				blend_shape_count(0),
 				blend_shape_mode(VS::BLEND_SHAPE_MODE_NORMALIZED) {
+			active = false;
+			last_pass = 0;
 		}
 	};
 
@@ -859,6 +872,7 @@ class RasterizerStorageGLES2 : public RasterizerStorage {
 		Immediate() {
 			type = GEOMETRY_IMMEDIATE;
 			building = false;
+			mask = 0;
 		}
 	};
 
diff --git a/drivers/gles3/rasterizer_storage_gles3.h b/drivers/gles3/rasterizer_storage_gles3.h
index 1101d25ee0c8..d2efcbd18806 100644
--- a/drivers/gles3/rasterizer_storage_gles3.h
+++ b/drivers/gles3/rasterizer_storage_gles3.h
@@ -182,6 +182,7 @@ class RasterizerStorageGLES3 : public RasterizerStorage {
 			vertex_mem = 0;
 			render.reset();
 			render_final.reset();
+			snap.reset();
 		}
 
 	} info;
@@ -240,6 +241,7 @@ class RasterizerStorageGLES3 : public RasterizerStorage {
 		virtual void material_changed_notify() {}
 
 		Geometry() {
+			type = GEOMETRY_INVALID;
 			last_pass = 0;
 			index = 0;
 		}
@@ -326,6 +328,11 @@ class RasterizerStorageGLES3 : public RasterizerStorage {
 				detect_srgb_ud(NULL),
 				detect_normal(NULL),
 				detect_normal_ud(NULL) {
+			depth = 0;
+			alloc_width = 0;
+			alloc_height = 0;
+			alloc_depth = 0;
+			is_npot_repeat_mipmap = false;
 		}
 
 		_ALWAYS_INLINE_ Texture *get_ptr() {
@@ -544,6 +551,9 @@ class RasterizerStorageGLES3 : public RasterizerStorage {
 			valid = false;
 			custom_code_id = 0;
 			version = 1;
+			texture_count = 0;
+			uses_fragment_time = false;
+			uses_vertex_time = false;
 		}
 	};
 
@@ -606,6 +616,7 @@ class RasterizerStorageGLES3 : public RasterizerStorage {
 				last_pass(0),
 				can_cast_shadow_cache(false),
 				is_animated_cache(false) {
+			index = 0;
 		}
 	};
 
@@ -724,6 +735,7 @@ class RasterizerStorageGLES3 : public RasterizerStorage {
 				active(false),
 				total_data_size(0) {
 			type = GEOMETRY_SURFACE;
+			max_bone = 0;
 		}
 
 		~Surface() {
@@ -1129,6 +1141,10 @@ class RasterizerStorageGLES3 : public RasterizerStorage {
 		GIProbeCompression compression;
 
 		GIProbeData() {
+			width = 0;
+			height = 0;
+			depth = 0;
+			levels = 0;
 		}
 	};
 
@@ -1243,6 +1259,10 @@ class RasterizerStorageGLES3 : public RasterizerStorage {
 				fractional_delta(false),
 				frame_remainder(0),
 				clear(true) {
+			phase = 0;
+			prev_phase = 0;
+			particle_valid_histories[0] = false;
+			particle_valid_histories[1] = false;
 			particle_buffers[0] = 0;
 			particle_buffers[1] = 0;
 			glGenBuffers(2, particle_buffers);
diff --git a/drivers/windows/dir_access_windows.cpp b/drivers/windows/dir_access_windows.cpp
index aead8d865390..70f4f0819105 100644
--- a/drivers/windows/dir_access_windows.cpp
+++ b/drivers/windows/dir_access_windows.cpp
@@ -386,6 +386,9 @@ String DirAccessWindows::get_filesystem_type() const {
 
 DirAccessWindows::DirAccessWindows() {
 
+	_cisdir = false;
+	_cishidden = false;
+
 	p = memnew(DirAccessWindowsPrivate);
 	p->h = INVALID_HANDLE_VALUE;
 	current_dir = ".";
diff --git a/drivers/windows/thread_windows.cpp b/drivers/windows/thread_windows.cpp
index ec5ccbd3b5cf..d5fcc51ba1f3 100644
--- a/drivers/windows/thread_windows.cpp
+++ b/drivers/windows/thread_windows.cpp
@@ -92,6 +92,7 @@ void ThreadWindows::make_default() {
 
 ThreadWindows::ThreadWindows() :
 		handle(NULL) {
+	user = NULL;
 }
 
 ThreadWindows::~ThreadWindows() {
diff --git a/drivers/xaudio2/audio_driver_xaudio2.cpp b/drivers/xaudio2/audio_driver_xaudio2.cpp
index 871b13de0e16..a02b5b9ffc44 100644
--- a/drivers/xaudio2/audio_driver_xaudio2.cpp
+++ b/drivers/xaudio2/audio_driver_xaudio2.cpp
@@ -203,6 +203,16 @@ AudioDriverXAudio2::AudioDriverXAudio2() :
 		thread(NULL),
 		mutex(NULL),
 		current_buffer(0) {
+	samples_in = NULL;
+	buffer_size = 0;
+	mix_rate = 0;
+	channels = 0;
+	active = false;
+	thread_exited = false;
+	exit_thread = false;
+	pcm_open = false;
+	mastering_voice = NULL;
+	source_voice = NULL;
 	wave_format = { 0 };
 	for (int i = 0; i < AUDIO_BUFFERS; i++) {
 		xaudio_buffer[i] = { 0 };
diff --git a/editor/animation_track_editor.cpp b/editor/animation_track_editor.cpp
index b5792034cfaf..21983ef60a55 100644
--- a/editor/animation_track_editor.cpp
+++ b/editor/animation_track_editor.cpp
@@ -694,6 +694,7 @@ class AnimationTrackKeyEdit : public Object {
 		track = -1;
 		setting = false;
 		root_path = NULL;
+		undo_redo = NULL;
 	}
 };
 
@@ -1393,6 +1394,7 @@ class AnimationMultiTrackKeyEdit : public Object {
 		use_fps = false;
 		setting = false;
 		root_path = NULL;
+		undo_redo = NULL;
 	}
 };
 
@@ -3242,6 +3244,8 @@ void AnimationTrackEditGroup::_bind_methods() {
 
 AnimationTrackEditGroup::AnimationTrackEditGroup() {
 	set_mouse_filter(MOUSE_FILTER_PASS);
+	root = NULL;
+	timeline = NULL;
 }
 
 //////////////////////////////////////
diff --git a/editor/code_editor.cpp b/editor/code_editor.cpp
index c3cbc841e4b1..e2276c0c1ee5 100644
--- a/editor/code_editor.cpp
+++ b/editor/code_editor.cpp
@@ -66,6 +66,8 @@ void GotoLineDialog::ok_pressed() {
 
 GotoLineDialog::GotoLineDialog() {
 
+	line_label = NULL;
+
 	set_title(TTR("Go to Line"));
 
 	VBoxContainer *vbc = memnew(VBoxContainer);
diff --git a/editor/collada/collada.h b/editor/collada/collada.h
index 3151c179831e..79676bf67a3f 100644
--- a/editor/collada/collada.h
+++ b/editor/collada/collada.h
@@ -252,6 +252,9 @@ class Collada {
 			Vector<float> sets;
 			Vector<float> indices;
 			int count;
+			Weights() {
+				count = 0;
+			}
 		} weights;
 
 		Map<String, Transform> bone_rest_map;
@@ -440,7 +443,10 @@ class Collada {
 		Map<String, Material> material_map;
 		Vector<String> skeletons;
 
-		NodeGeometry() { type = TYPE_GEOMETRY; }
+		NodeGeometry() {
+			type = TYPE_GEOMETRY;
+			controller = false;
+		}
 	};
 
 	struct NodeCamera : public Node {
@@ -507,7 +513,10 @@ class Collada {
 			Point2 out_tangent;
 			InterpolationType interp_type;
 
-			Key() { interp_type = INTERP_LINEAR; }
+			Key() {
+				interp_type = INTERP_LINEAR;
+				time = 0;
+			}
 		};
 
 		Vector<float> get_value_at_time(float p_time) const;
@@ -580,6 +589,7 @@ class Collada {
 				unit_scale(1.0),
 				up_axis(Vector3::AXIS_Y),
 				animation_length(0) {
+			z_up = false;
 		}
 	} state;
 
diff --git a/editor/dependency_editor.cpp b/editor/dependency_editor.cpp
index da9e40998e1b..cd39a7f96e38 100644
--- a/editor/dependency_editor.cpp
+++ b/editor/dependency_editor.cpp
@@ -638,6 +638,8 @@ void DependencyErrorDialog::custom_action(const String &) {
 
 DependencyErrorDialog::DependencyErrorDialog() {
 
+	mode = Mode::MODE_RESOURCE;
+
 	VBoxContainer *vb = memnew(VBoxContainer);
 	add_child(vb);
 
diff --git a/editor/editor_autoload_settings.h b/editor/editor_autoload_settings.h
index 3a6e249186b4..b55e27337cd9 100644
--- a/editor/editor_autoload_settings.h
+++ b/editor/editor_autoload_settings.h
@@ -64,6 +64,7 @@ class EditorAutoloadSettings : public VBoxContainer {
 			is_singleton = false;
 			in_editor = false;
 			node = NULL;
+			order = 0;
 		}
 	};
 
diff --git a/editor/editor_help_search.cpp b/editor/editor_help_search.cpp
index 6057edeedc2b..4aa6873b2bce 100644
--- a/editor/editor_help_search.cpp
+++ b/editor/editor_help_search.cpp
@@ -601,4 +601,8 @@ EditorHelpSearch::Runner::Runner(Control *p_icon_service, Tree *p_results_tree,
 		search_flags(p_search_flags),
 		empty_icon(ui_service->get_icon("ArrowRight", "EditorIcons")),
 		disabled_color(ui_service->get_color("disabled_font_color", "Editor")) {
+	iterator_doc = NULL;
+	iterator_match = NULL;
+	root_item = NULL;
+	matched_item = NULL;
 }
diff --git a/editor/editor_profiler.h b/editor/editor_profiler.h
index c2a79a2159c1..5a90233bde9c 100644
--- a/editor/editor_profiler.h
+++ b/editor/editor_profiler.h
@@ -83,6 +83,10 @@ class EditorProfiler : public VBoxContainer {
 		Metric() {
 			valid = false;
 			frame_number = 0;
+			frame_time = 0;
+			idle_time = 0;
+			physics_time = 0;
+			physics_frame_time = 0;
 		}
 	};
 
diff --git a/editor/editor_properties.cpp b/editor/editor_properties.cpp
index eb611e71fe1a..fdc0872a5969 100644
--- a/editor/editor_properties.cpp
+++ b/editor/editor_properties.cpp
@@ -46,6 +46,7 @@ EditorPropertyNil::EditorPropertyNil() {
 	Label *label = memnew(Label);
 	label->set_text("[null]");
 	add_child(label);
+	text = NULL;
 }
 
 ///////////////////// TEXT /////////////////////////
diff --git a/editor/editor_sectioned_inspector.cpp b/editor/editor_sectioned_inspector.cpp
index bfe3a5350167..7466b3933490 100644
--- a/editor/editor_sectioned_inspector.cpp
+++ b/editor/editor_sectioned_inspector.cpp
@@ -128,6 +128,7 @@ class SectionedInspectorFilter : public Object {
 
 	SectionedInspectorFilter() {
 		edited = NULL;
+		allow_sub = false;
 	}
 };
 
diff --git a/editor/find_in_files.cpp b/editor/find_in_files.cpp
index 50a5520b012c..d4b6c8653299 100644
--- a/editor/find_in_files.cpp
+++ b/editor/find_in_files.cpp
@@ -90,6 +90,7 @@ FindInFiles::FindInFiles() {
 	_searching = false;
 	_whole_words = true;
 	_match_case = true;
+	_initial_files_count = 0;
 }
 
 void FindInFiles::set_search_text(String p_pattern) {
diff --git a/editor/import/editor_import_collada.cpp b/editor/import/editor_import_collada.cpp
index 06ac3e8812c3..f9cab33ad900 100644
--- a/editor/import/editor_import_collada.cpp
+++ b/editor/import/editor_import_collada.cpp
@@ -107,6 +107,8 @@ struct ColladaImport {
 		force_make_tangents = false;
 		apply_mesh_xform_to_vertices = true;
 		bake_fps = 15;
+		scene = NULL;
+		use_mesh_builtin_materials = false;
 	}
 };
 
diff --git a/editor/import/editor_scene_importer_gltf.h b/editor/import/editor_scene_importer_gltf.h
index af195454035c..ce987bd8c1f4 100644
--- a/editor/import/editor_scene_importer_gltf.h
+++ b/editor/import/editor_scene_importer_gltf.h
@@ -182,6 +182,7 @@ class EditorSceneImporterGLTF : public EditorSceneImporter {
 			sparse_indices_component_type = 0;
 			sparse_values_buffer_view = 0;
 			sparse_values_byte_offset = 0;
+			type = GLTFType::TYPE_MAT2;
 		}
 	};
 	struct GLTFTexture {
diff --git a/editor/plugins/collision_shape_2d_editor_plugin.cpp b/editor/plugins/collision_shape_2d_editor_plugin.cpp
index 82149f4b6213..51562634b032 100644
--- a/editor/plugins/collision_shape_2d_editor_plugin.cpp
+++ b/editor/plugins/collision_shape_2d_editor_plugin.cpp
@@ -583,6 +583,7 @@ CollisionShape2DEditor::CollisionShape2DEditor(EditorNode *p_editor) {
 
 	edit_handle = -1;
 	pressed = false;
+	shape_type = 0;
 }
 
 void CollisionShape2DEditorPlugin::edit(Object *p_obj) {
diff --git a/editor/plugins/editor_preview_plugins.cpp b/editor/plugins/editor_preview_plugins.cpp
index 96a0cba48555..f65ceddc67a7 100644
--- a/editor/plugins/editor_preview_plugins.cpp
+++ b/editor/plugins/editor_preview_plugins.cpp
@@ -362,6 +362,8 @@ Ref<Texture> EditorMaterialPreviewPlugin::generate(const RES &p_from, const Size
 
 EditorMaterialPreviewPlugin::EditorMaterialPreviewPlugin() {
 
+	preview_done = false;
+
 	scenario = VS::get_singleton()->scenario_create();
 
 	viewport = VS::get_singleton()->viewport_create();
@@ -769,6 +771,8 @@ Ref<Texture> EditorMeshPreviewPlugin::generate(const RES &p_from, const Size2 &p
 
 EditorMeshPreviewPlugin::EditorMeshPreviewPlugin() {
 
+	preview_done = false;
+
 	scenario = VS::get_singleton()->scenario_create();
 
 	viewport = VS::get_singleton()->viewport_create();
@@ -904,6 +908,8 @@ Ref<Texture> EditorFontPreviewPlugin::generate(const RES &p_from, const Size2 &p
 
 EditorFontPreviewPlugin::EditorFontPreviewPlugin() {
 
+	preview_done = false;
+
 	viewport = VS::get_singleton()->viewport_create();
 	VS::get_singleton()->viewport_set_update_mode(viewport, VS::VIEWPORT_UPDATE_DISABLED);
 	VS::get_singleton()->viewport_set_vflip(viewport, true);
diff --git a/editor/plugins/mesh_library_editor_plugin.cpp b/editor/plugins/mesh_library_editor_plugin.cpp
index 8993b9258b7e..1ced98b4cdf7 100644
--- a/editor/plugins/mesh_library_editor_plugin.cpp
+++ b/editor/plugins/mesh_library_editor_plugin.cpp
@@ -317,6 +317,8 @@ void MeshLibraryEditorPlugin::make_visible(bool p_visible) {
 
 MeshLibraryEditorPlugin::MeshLibraryEditorPlugin(EditorNode *p_node) {
 
+	editor = NULL;
+
 	EDITOR_DEF("editors/grid_map/preview_size", 64);
 	mesh_library_editor = memnew(MeshLibraryEditor(p_node));
 
diff --git a/editor/plugins/path_editor_plugin.cpp b/editor/plugins/path_editor_plugin.cpp
index 35eef6102e72..2a8e4cfcdb4b 100644
--- a/editor/plugins/path_editor_plugin.cpp
+++ b/editor/plugins/path_editor_plugin.cpp
@@ -288,6 +288,8 @@ void PathSpatialGizmo::redraw() {
 
 PathSpatialGizmo::PathSpatialGizmo(Path *p_path) {
 
+	orig_in_length = 0;
+	orig_out_length = 0;
 	path = p_path;
 	set_spatial_node(p_path);
 }
diff --git a/editor/plugins/shader_editor_plugin.cpp b/editor/plugins/shader_editor_plugin.cpp
index b42ef8a6cf04..f8a985029278 100644
--- a/editor/plugins/shader_editor_plugin.cpp
+++ b/editor/plugins/shader_editor_plugin.cpp
@@ -760,6 +760,7 @@ void ShaderEditorPlugin::apply_changes() {
 
 ShaderEditorPlugin::ShaderEditorPlugin(EditorNode *p_node) {
 
+	_2d = false;
 	editor = p_node;
 	shader_editor = memnew(ShaderEditor(p_node));
 
diff --git a/editor/plugins/visual_shader_editor_plugin.cpp b/editor/plugins/visual_shader_editor_plugin.cpp
index 3e1a20f1c705..0428243c34ff 100644
--- a/editor/plugins/visual_shader_editor_plugin.cpp
+++ b/editor/plugins/visual_shader_editor_plugin.cpp
@@ -3432,6 +3432,8 @@ void VisualShaderNodePortPreview::_bind_methods() {
 }
 
 VisualShaderNodePortPreview::VisualShaderNodePortPreview() {
+	node = 0;
+	port = 0;
 }
 
 //////////////////////////////////
diff --git a/editor/project_manager.cpp b/editor/project_manager.cpp
index f72700d17925..a82227b1e40e 100644
--- a/editor/project_manager.cpp
+++ b/editor/project_manager.cpp
@@ -2858,7 +2858,8 @@ void ProjectListFilter::set_filter_size(int h_size) {
 }
 
 ProjectListFilter::ProjectListFilter() {
-
+	filter_option = NULL;
+	search_box = NULL;
 	_current_filter = FILTER_NAME;
 	has_search_box = false;
 }
diff --git a/modules/bullet/generic_6dof_joint_bullet.cpp b/modules/bullet/generic_6dof_joint_bullet.cpp
index ad1ec2b0d408..c566c372a9d3 100644
--- a/modules/bullet/generic_6dof_joint_bullet.cpp
+++ b/modules/bullet/generic_6dof_joint_bullet.cpp
@@ -43,6 +43,12 @@
 Generic6DOFJointBullet::Generic6DOFJointBullet(RigidBodyBullet *rbA, RigidBodyBullet *rbB, const Transform &frameInA, const Transform &frameInB) :
 		JointBullet() {
 
+	for (int i = 0; i < 3; i++) {
+		for (int j = 0; j < PhysicsServer::G6DOF_JOINT_FLAG_MAX; j++) {
+			flags[i][j] = false;
+		}
+	}
+
 	Transform scaled_AFrame(frameInA.scaled(rbA->get_body_scale()));
 
 	scaled_AFrame.basis.rotref_posscale_decomposition(scaled_AFrame.basis);
diff --git a/modules/bullet/godot_result_callbacks.h b/modules/bullet/godot_result_callbacks.h
index 4d3531a5989b..42ee9e7954d4 100644
--- a/modules/bullet/godot_result_callbacks.h
+++ b/modules/bullet/godot_result_callbacks.h
@@ -204,7 +204,9 @@ struct GodotRestInfoContactResultCallback : public btCollisionWorld::ContactResu
 			m_collided(false),
 			m_min_distance(0),
 			collide_with_bodies(p_collide_with_bodies),
-			collide_with_areas(p_collide_with_areas) {}
+			collide_with_areas(p_collide_with_areas) {
+		m_rest_info_collision_object = NULL;
+	}
 
 	virtual bool needsCollision(btBroadphaseProxy *proxy0) const;
 
diff --git a/modules/bullet/rigid_body_bullet.h b/modules/bullet/rigid_body_bullet.h
index ef58e10a3c76..ace48571e177 100644
--- a/modules/bullet/rigid_body_bullet.h
+++ b/modules/bullet/rigid_body_bullet.h
@@ -85,7 +85,7 @@ class BulletPhysicsDirectBodyState : public PhysicsDirectBodyState {
 	real_t deltaTime;
 
 private:
-	BulletPhysicsDirectBodyState() {}
+	BulletPhysicsDirectBodyState() { body = NULL; }
 
 public:
 	virtual Vector3 get_total_gravity() const;
diff --git a/modules/bullet/shape_bullet.cpp b/modules/bullet/shape_bullet.cpp
index 97a3715e6c3c..2bd7d56ab2cc 100644
--- a/modules/bullet/shape_bullet.cpp
+++ b/modules/bullet/shape_bullet.cpp
@@ -445,7 +445,10 @@ btCollisionShape *ConcavePolygonShapeBullet::create_bt_shape(const btVector3 &p_
 /* Height map shape */
 
 HeightMapShapeBullet::HeightMapShapeBullet() :
-		ShapeBullet() {}
+		ShapeBullet() {
+	width = 0;
+	depth = 0;
+}
 
 void HeightMapShapeBullet::set_data(const Variant &p_data) {
 	ERR_FAIL_COND(p_data.get_type() != Variant::DICTIONARY);
diff --git a/modules/bullet/soft_body_bullet.cpp b/modules/bullet/soft_body_bullet.cpp
index b8ec18be7ffc..ca12be68a9b3 100644
--- a/modules/bullet/soft_body_bullet.cpp
+++ b/modules/bullet/soft_body_bullet.cpp
@@ -47,7 +47,9 @@ SoftBodyBullet::SoftBodyBullet() :
 		pressure_coefficient(0.),
 		pose_matching_coefficient(0.),
 		damping_coefficient(0.01),
-		drag_coefficient(0.) {}
+		drag_coefficient(0.) {
+	mat0 = NULL;
+}
 
 SoftBodyBullet::~SoftBodyBullet() {
 }
diff --git a/modules/enet/networked_multiplayer_enet.cpp b/modules/enet/networked_multiplayer_enet.cpp
index 1ca77ce0235c..8bf273805208 100644
--- a/modules/enet/networked_multiplayer_enet.cpp
+++ b/modules/enet/networked_multiplayer_enet.cpp
@@ -911,6 +911,8 @@ void NetworkedMultiplayerENet::_bind_methods() {
 
 NetworkedMultiplayerENet::NetworkedMultiplayerENet() {
 
+	peer = NULL;
+	host = NULL;
 	active = false;
 	server = false;
 	refuse_connections = false;
diff --git a/modules/gdnative/gdnative_library_editor_plugin.cpp b/modules/gdnative/gdnative_library_editor_plugin.cpp
index 1eafabc32aa2..aa0e4efe431e 100644
--- a/modules/gdnative/gdnative_library_editor_plugin.cpp
+++ b/modules/gdnative/gdnative_library_editor_plugin.cpp
@@ -437,6 +437,7 @@ void GDNativeLibraryEditorPlugin::make_visible(bool p_visible) {
 
 GDNativeLibraryEditorPlugin::GDNativeLibraryEditorPlugin(EditorNode *p_node) {
 
+	editor = NULL;
 	library_editor = memnew(GDNativeLibraryEditor);
 	library_editor->set_custom_minimum_size(Size2(0, 250 * EDSCALE));
 	button = p_node->add_bottom_panel_item(TTR("GDNativeLibrary"), library_editor);
diff --git a/modules/gdnative/nativescript/nativescript.h b/modules/gdnative/nativescript/nativescript.h
index de0dfe56fdc3..77a8db5adf47 100644
--- a/modules/gdnative/nativescript/nativescript.h
+++ b/modules/gdnative/nativescript/nativescript.h
@@ -93,6 +93,8 @@ struct NativeScriptDesc {
 			base_native_type(),
 			documentation(),
 			type_tag(NULL) {
+		base_data = NULL;
+		is_tool = false;
 		zeromem(&create_func, sizeof(godot_instance_create_func));
 		zeromem(&destroy_func, sizeof(godot_instance_destroy_func));
 	}
diff --git a/modules/gdnative/pluginscript/pluginscript_instance.cpp b/modules/gdnative/pluginscript/pluginscript_instance.cpp
index f3c6f59573b7..5f622bf11481 100644
--- a/modules/gdnative/pluginscript/pluginscript_instance.cpp
+++ b/modules/gdnative/pluginscript/pluginscript_instance.cpp
@@ -118,6 +118,9 @@ bool PluginScriptInstance::refcount_decremented() {
 }
 
 PluginScriptInstance::PluginScriptInstance() {
+	_owner = NULL;
+	_data = NULL;
+	_desc = NULL;
 }
 
 bool PluginScriptInstance::init(PluginScript *p_script, Object *p_owner) {
diff --git a/modules/gdnative/videodecoder/video_stream_gdnative.h b/modules/gdnative/videodecoder/video_stream_gdnative.h
index d8aeb12ac6f5..59a7c2283dc6 100644
--- a/modules/gdnative/videodecoder/video_stream_gdnative.h
+++ b/modules/gdnative/videodecoder/video_stream_gdnative.h
@@ -194,7 +194,9 @@ class VideoStreamGDNative : public VideoStream {
 	virtual void set_audio_track(int p_track);
 	virtual Ref<VideoStreamPlayback> instance_playback();
 
-	VideoStreamGDNative() {}
+	VideoStreamGDNative() {
+		audio_track = 0;
+	}
 };
 
 class ResourceFormatLoaderVideoStreamGDNative : public ResourceFormatLoader {
diff --git a/modules/gdscript/gdscript_compiler.cpp b/modules/gdscript/gdscript_compiler.cpp
index 09285b16f01a..7128dbbe6e95 100644
--- a/modules/gdscript/gdscript_compiler.cpp
+++ b/modules/gdscript/gdscript_compiler.cpp
@@ -2203,4 +2203,8 @@ int GDScriptCompiler::get_error_column() const {
 }
 
 GDScriptCompiler::GDScriptCompiler() {
+	parser = NULL;
+	main_script = NULL;
+	err_line = 0;
+	err_column = 0;
 }
diff --git a/modules/gdscript/gdscript_function.cpp b/modules/gdscript/gdscript_function.cpp
index 06bdfc3885d2..6aabd69686a5 100644
--- a/modules/gdscript/gdscript_function.cpp
+++ b/modules/gdscript/gdscript_function.cpp
@@ -1769,6 +1769,18 @@ void GDScriptFunction::debug_get_stack_member_state(int p_line, List<Pair<String
 GDScriptFunction::GDScriptFunction() :
 		function_list(this) {
 
+	_constants_ptr = NULL;
+	_constant_count = 0;
+	_global_names_ptr = NULL;
+	_global_names_count = 0;
+	_default_arg_ptr = NULL;
+	_default_arg_count = 0;
+	_code_ptr = NULL;
+	_code_size = 0;
+	_argument_count = 0;
+	_initial_line = 0;
+	_static = false;
+	_script = NULL;
 	_stack_size = 0;
 	_call_size = 0;
 	rpc_mode = MultiplayerAPI::RPC_MODE_DISABLED;
diff --git a/modules/gdscript/gdscript_parser.cpp b/modules/gdscript/gdscript_parser.cpp
index 9652a5dc5631..93c362afb90c 100644
--- a/modules/gdscript/gdscript_parser.cpp
+++ b/modules/gdscript/gdscript_parser.cpp
@@ -8936,6 +8936,9 @@ int GDScriptParser::get_completion_identifier_is_function() {
 
 GDScriptParser::GDScriptParser() {
 
+	completion_line = 0;
+	completion_argument = 0;
+	completion_ident_is_call = false;
 	head = NULL;
 	list = NULL;
 	tokenizer = NULL;
diff --git a/modules/gdscript/gdscript_parser.h b/modules/gdscript/gdscript_parser.h
index e7809894dc2c..cad60a83453b 100644
--- a/modules/gdscript/gdscript_parser.h
+++ b/modules/gdscript/gdscript_parser.h
@@ -202,6 +202,8 @@ class GDScriptParser {
 			classname_used = false;
 			end_line = -1;
 			owner = NULL;
+			initializer = NULL;
+			ready = NULL;
 		}
 	};
 
@@ -226,6 +228,7 @@ class GDScriptParser {
 		int get_required_argument_count() { return arguments.size() - default_values.size(); }
 
 		FunctionNode() {
+			body = NULL;
 			type = TYPE_FUNCTION;
 			_static = false;
 			rpc_mode = MultiplayerAPI::RPC_MODE_DISABLED;
@@ -265,7 +268,10 @@ class GDScriptParser {
 	};
 	struct BuiltInFunctionNode : public Node {
 		GDScriptFunctions::Function function;
-		BuiltInFunctionNode() { type = TYPE_BUILT_IN_FUNCTION; }
+		BuiltInFunctionNode() {
+			function = GDScriptFunctions::Function::MATH_SIN;
+			type = TYPE_BUILT_IN_FUNCTION;
+		}
 	};
 
 	struct IdentifierNode : public Node {
@@ -276,6 +282,7 @@ class GDScriptParser {
 		virtual DataType get_datatype() const { return datatype; }
 		virtual void set_datatype(const DataType &p_datatype) { datatype = p_datatype; }
 		IdentifierNode() {
+
 			type = TYPE_IDENTIFIER;
 			declared_block = NULL;
 		}
@@ -405,7 +412,10 @@ class GDScriptParser {
 		DataType datatype;
 		virtual DataType get_datatype() const { return datatype; }
 		virtual void set_datatype(const DataType &p_datatype) { datatype = p_datatype; }
-		OperatorNode() { type = TYPE_OPERATOR; }
+		OperatorNode() {
+			op = OP_CALL;
+			type = TYPE_OPERATOR;
+		}
 	};
 
 	struct PatternNode : public Node {
@@ -468,6 +478,8 @@ class GDScriptParser {
 			cf_type = CF_IF;
 			body = NULL;
 			body_else = NULL;
+			match = NULL;
+			_else = NULL;
 		}
 	};
 
@@ -477,7 +489,10 @@ class GDScriptParser {
 		DataType return_type;
 		virtual DataType get_datatype() const { return return_type; }
 		virtual void set_datatype(const DataType &p_datatype) { return_type = p_datatype; }
-		CastNode() { type = TYPE_CAST; }
+		CastNode() {
+			type = TYPE_CAST;
+			source_node = NULL;
+		}
 	};
 
 	struct AssertNode : public Node {
diff --git a/modules/gridmap/grid_map.h b/modules/gridmap/grid_map.h
index a8acb07b28c8..6630f024847a 100644
--- a/modules/gridmap/grid_map.h
+++ b/modules/gridmap/grid_map.h
@@ -93,6 +93,9 @@ class GridMap : public Spatial {
 		struct NavMesh {
 			int id;
 			Transform xform;
+			NavMesh() {
+				id = 0;
+			}
 		};
 
 		struct MultimeshInstance {
diff --git a/modules/mobile_vr/mobile_vr_interface.cpp b/modules/mobile_vr/mobile_vr_interface.cpp
index c07a87f979b5..2a708335032f 100644
--- a/modules/mobile_vr/mobile_vr_interface.cpp
+++ b/modules/mobile_vr/mobile_vr_interface.cpp
@@ -448,6 +448,9 @@ void MobileVRInterface::notification(int p_what){
 
 MobileVRInterface::MobileVRInterface() {
 	initialized = false;
+	mag_count = 0;
+	has_gyro = false;
+	sensor_first = false;
 
 	// Just set some defaults for these. At some point we need to look at adding a lookup table for common device + headset combos and/or support reading cardboard QR codes
 	eye_height = 1.85;
diff --git a/modules/mono/mono_gd/gd_mono_log.cpp b/modules/mono/mono_gd/gd_mono_log.cpp
index ef29e40eb10d..ec8f5f39f610 100644
--- a/modules/mono/mono_gd/gd_mono_log.cpp
+++ b/modules/mono/mono_gd/gd_mono_log.cpp
@@ -193,6 +193,7 @@ GDMonoLog::GDMonoLog() {
 
 	singleton = this;
 
+	log_file = NULL;
 	log_level_id = -1;
 }
 
diff --git a/modules/mono/signal_awaiter_utils.cpp b/modules/mono/signal_awaiter_utils.cpp
index c76da4fcc917..91d730b1874a 100644
--- a/modules/mono/signal_awaiter_utils.cpp
+++ b/modules/mono/signal_awaiter_utils.cpp
@@ -117,6 +117,7 @@ void SignalAwaiterHandle::_bind_methods() {
 
 SignalAwaiterHandle::SignalAwaiterHandle(MonoObject *p_managed) :
 		MonoGCHandle(MonoGCHandle::new_strong_handle(p_managed), STRONG_HANDLE) {
+	completed = false;
 
 #ifdef DEBUG_ENABLED
 	conn_target_id = 0;
diff --git a/modules/stb_vorbis/audio_stream_ogg_vorbis.h b/modules/stb_vorbis/audio_stream_ogg_vorbis.h
index a9477ca165d3..ea4650d8aaef 100644
--- a/modules/stb_vorbis/audio_stream_ogg_vorbis.h
+++ b/modules/stb_vorbis/audio_stream_ogg_vorbis.h
@@ -66,7 +66,12 @@ class AudioStreamPlaybackOGGVorbis : public AudioStreamPlaybackResampled {
 	virtual float get_playback_position() const;
 	virtual void seek(float p_time);
 
-	AudioStreamPlaybackOGGVorbis() {}
+	AudioStreamPlaybackOGGVorbis() {
+		ogg_stream = NULL;
+		frames_mixed = 0;
+		active = false;
+		loops = 0;
+	}
 	~AudioStreamPlaybackOGGVorbis();
 };
 
diff --git a/modules/theora/video_stream_theora.cpp b/modules/theora/video_stream_theora.cpp
index a457147c3c87..4812a471d3d8 100644
--- a/modules/theora/video_stream_theora.cpp
+++ b/modules/theora/video_stream_theora.cpp
@@ -672,6 +672,15 @@ void VideoStreamPlaybackTheora::_streaming_thread(void *ud) {
 
 VideoStreamPlaybackTheora::VideoStreamPlaybackTheora() {
 
+	theora_eos = false;
+	vorbis_eos = false;
+	td = NULL;
+	pp_inc = 0;
+	pp_level = 0;
+	pp_level_max = 0;
+	last_update_time = 0;
+	time = 0;
+
 	file = NULL;
 	theora_p = 0;
 	vorbis_p = 0;
diff --git a/modules/visual_script/visual_script.cpp b/modules/visual_script/visual_script.cpp
index 7a3a0124afd2..569cfcbb794d 100644
--- a/modules/visual_script/visual_script.cpp
+++ b/modules/visual_script/visual_script.cpp
@@ -156,6 +156,16 @@ VisualScriptNode::VisualScriptNode() {
 
 VisualScriptNodeInstance::VisualScriptNodeInstance() {
 
+	id = 0;
+	sequence_index = 0;
+	sequence_output_count = 0;
+	input_port_count = 0;
+	output_port_count = 0;
+	output_ports = NULL;
+	working_mem_idx = 0;
+	pass_idx = 0;
+	base = NULL;
+
 	sequence_outputs = NULL;
 	input_ports = NULL;
 }
@@ -2294,6 +2304,9 @@ ScriptLanguage *VisualScriptInstance::get_language() {
 }
 
 VisualScriptInstance::VisualScriptInstance() {
+	owner = NULL;
+	max_input_args = 0;
+	max_output_args = 0;
 }
 
 VisualScriptInstance::~VisualScriptInstance() {
@@ -2409,6 +2422,12 @@ void VisualScriptFunctionState::_bind_methods() {
 }
 
 VisualScriptFunctionState::VisualScriptFunctionState() {
+	instance = NULL;
+	working_mem_index = 0;
+	variant_stack_size = 0;
+	node = NULL;
+	flow_stack_pos = 0;
+	pass = 0;
 }
 
 VisualScriptFunctionState::~VisualScriptFunctionState() {
diff --git a/modules/visual_script/visual_script_expression.cpp b/modules/visual_script/visual_script_expression.cpp
index b72bcaa4f770..1b6f9fc1ec39 100644
--- a/modules/visual_script/visual_script_expression.cpp
+++ b/modules/visual_script/visual_script_expression.cpp
@@ -1487,6 +1487,7 @@ VisualScriptExpression::VisualScriptExpression() {
 	root = NULL;
 	nodes = NULL;
 	sequenced = false;
+	str_ofs = 0;
 }
 
 VisualScriptExpression::~VisualScriptExpression() {
diff --git a/modules/visual_script/visual_script_expression.h b/modules/visual_script/visual_script_expression.h
index c9dd67f51740..bd21d2e30ad1 100644
--- a/modules/visual_script/visual_script_expression.h
+++ b/modules/visual_script/visual_script_expression.h
@@ -138,7 +138,10 @@ class VisualScriptExpression : public VisualScriptNode {
 
 		Type type;
 
-		ENode() { next = NULL; }
+		ENode() {
+			next = NULL;
+			type = TYPE_INPUT;
+		}
 		virtual ~ENode() {
 			if (next) {
 				memdelete(next);
@@ -161,6 +164,7 @@ class VisualScriptExpression : public VisualScriptNode {
 
 		int index;
 		InputNode() {
+			index = 0;
 			type = TYPE_INPUT;
 		}
 	};
@@ -180,6 +184,8 @@ class VisualScriptExpression : public VisualScriptNode {
 		ENode *nodes[2];
 
 		OperatorNode() {
+			nodes[0] = NULL;
+			nodes[1] = NULL;
 			type = TYPE_OPERATOR;
 		}
 	};
@@ -196,6 +202,8 @@ class VisualScriptExpression : public VisualScriptNode {
 		ENode *index;
 
 		IndexNode() {
+			base = NULL;
+			index = NULL;
 			type = TYPE_INDEX;
 		}
 	};
@@ -205,6 +213,7 @@ class VisualScriptExpression : public VisualScriptNode {
 		StringName name;
 
 		NamedIndexNode() {
+			base = NULL;
 			type = TYPE_NAMED_INDEX;
 		}
 	};
@@ -224,6 +233,7 @@ class VisualScriptExpression : public VisualScriptNode {
 		Vector<ENode *> arguments;
 
 		CallNode() {
+			base = NULL;
 			type = TYPE_CALL;
 		}
 	};
@@ -246,6 +256,7 @@ class VisualScriptExpression : public VisualScriptNode {
 		VisualScriptBuiltinFunc::BuiltinFunc func;
 		Vector<ENode *> arguments;
 		BuiltinFuncNode() {
+			func = VisualScriptBuiltinFunc::BuiltinFunc::BYTES_TO_VAR;
 			type = TYPE_BUILTIN_FUNC;
 		}
 	};
diff --git a/modules/webrtc/webrtc_multiplayer.cpp b/modules/webrtc/webrtc_multiplayer.cpp
index 393d843b55eb..2b0b7d6c23d4 100644
--- a/modules/webrtc/webrtc_multiplayer.cpp
+++ b/modules/webrtc/webrtc_multiplayer.cpp
@@ -369,6 +369,7 @@ void WebRTCMultiplayer::close() {
 
 WebRTCMultiplayer::WebRTCMultiplayer() {
 	unique_id = 0;
+	client_count = 0;
 	next_packet_peer = 0;
 	target_peer = 0;
 	transfer_mode = TRANSFER_MODE_RELIABLE;
diff --git a/platform/android/audio_driver_opensl.cpp b/platform/android/audio_driver_opensl.cpp
index 44d5c7ca10e5..c206795ac99b 100644
--- a/platform/android/audio_driver_opensl.cpp
+++ b/platform/android/audio_driver_opensl.cpp
@@ -359,6 +359,9 @@ void AudioDriverOpenSL::set_pause(bool p_pause) {
 
 AudioDriverOpenSL::AudioDriverOpenSL() {
 	s_ad = this;
+	buffer_size = 0;
+	mixdown_buffer = NULL;
+	last_free = 0;
 	mutex = Mutex::create(); //NULL;
 	pause = false;
 	active = false;
diff --git a/platform/android/file_access_android.cpp b/platform/android/file_access_android.cpp
index f352900413a4..b820c67c67b9 100644
--- a/platform/android/file_access_android.cpp
+++ b/platform/android/file_access_android.cpp
@@ -177,6 +177,8 @@ bool FileAccessAndroid::file_exists(const String &p_path) {
 FileAccessAndroid::FileAccessAndroid() {
 	a = NULL;
 	eof = false;
+	len = 0;
+	pos = 0;
 }
 
 FileAccessAndroid::~FileAccessAndroid() {
diff --git a/platform/android/os_android.cpp b/platform/android/os_android.cpp
index c45774402efc..cfa4ce970bd2 100644
--- a/platform/android/os_android.cpp
+++ b/platform/android/os_android.cpp
@@ -925,6 +925,11 @@ bool OS_Android::_check_internal_feature_support(const String &p_feature) {
 
 OS_Android::OS_Android(GodotJavaWrapper *p_godot_java, GodotIOJavaWrapper *p_godot_io_java, bool p_use_apk_expansion) {
 
+	use_16bits_fbo = false;
+	visual_server = NULL;
+	input = NULL;
+	video_driver_index = 0;
+
 	use_apk_expansion = p_use_apk_expansion;
 	default_videomode.width = 800;
 	default_videomode.height = 600;
diff --git a/platform/android/thread_jandroid.cpp b/platform/android/thread_jandroid.cpp
index ab370e8317ee..a2e91548580a 100644
--- a/platform/android/thread_jandroid.cpp
+++ b/platform/android/thread_jandroid.cpp
@@ -149,6 +149,7 @@ JNIEnv *ThreadAndroid::get_env() {
 
 ThreadAndroid::ThreadAndroid() {
 
+	user = NULL;
 	pthread = 0;
 }
 
diff --git a/platform/iphone/export/export.cpp b/platform/iphone/export/export.cpp
index af09b4d2e3f9..52458b33317c 100644
--- a/platform/iphone/export/export.cpp
+++ b/platform/iphone/export/export.cpp
@@ -1832,6 +1832,7 @@ bool EditorExportPlatformIOS::can_export(const Ref<EditorExportPreset> &p_preset
 
 EditorExportPlatformIOS::EditorExportPlatformIOS() {
 
+	version_code = 0;
 	Ref<Image> img = memnew(Image(_iphone_logo));
 	logo.instance();
 	logo->create_from_image(img);
diff --git a/platform/javascript/os_javascript.cpp b/platform/javascript/os_javascript.cpp
index 9b6942d930ce..fa5ef935f991 100644
--- a/platform/javascript/os_javascript.cpp
+++ b/platform/javascript/os_javascript.cpp
@@ -1218,6 +1218,9 @@ OS_JavaScript *OS_JavaScript::get_singleton() {
 }
 
 OS_JavaScript::OS_JavaScript() {
+	input = NULL;
+	video_driver_index = 0;
+
 	// Expose method for requesting quit.
 	godot_js_os_request_quit_cb(&request_quit_callback);
 	// Set canvas ID
diff --git a/platform/osx/export/export.cpp b/platform/osx/export/export.cpp
index acefd1db651b..d2cbc96d50f6 100644
--- a/platform/osx/export/export.cpp
+++ b/platform/osx/export/export.cpp
@@ -824,6 +824,8 @@ bool EditorExportPlatformOSX::can_export(const Ref<EditorExportPreset> &p_preset
 
 EditorExportPlatformOSX::EditorExportPlatformOSX() {
 
+	version_code = 0;
+
 	Ref<Image> img = memnew(Image(_osx_logo));
 	logo.instance();
 	logo->create_from_image(img);
diff --git a/platform/server/os_server.cpp b/platform/server/os_server.cpp
index 94bd81566551..ce3b1e31de52 100644
--- a/platform/server/os_server.cpp
+++ b/platform/server/os_server.cpp
@@ -327,6 +327,13 @@ bool OS_Server::is_disable_crash_handler() const {
 
 OS_Server::OS_Server() {
 
+	visual_server = NULL;
+	main_loop = NULL;
+	force_quit = false;
+	input = NULL;
+	power_manager = NULL;
+	video_driver_index = 0;
+
 	//adriver here
 	grab = false;
 };
diff --git a/platform/uwp/context_egl_uwp.cpp b/platform/uwp/context_egl_uwp.cpp
index f10736cf8549..e25483db5fb1 100644
--- a/platform/uwp/context_egl_uwp.cpp
+++ b/platform/uwp/context_egl_uwp.cpp
@@ -213,7 +213,9 @@ ContextEGL_UWP::ContextEGL_UWP(CoreWindow ^ p_window, Driver p_driver) :
 		mEglContext(EGL_NO_CONTEXT),
 		mEglSurface(EGL_NO_SURFACE),
 		driver(p_driver),
-		window(p_window) {}
+		window(p_window) {
+	vsync = false;
+}
 
 ContextEGL_UWP::~ContextEGL_UWP() {
 
diff --git a/platform/uwp/export/export.cpp b/platform/uwp/export/export.cpp
index 8ee19f5df23e..5b578c302472 100644
--- a/platform/uwp/export/export.cpp
+++ b/platform/uwp/export/export.cpp
@@ -644,7 +644,9 @@ void AppxPackager::finish() {
 	package = NULL;
 }
 
-AppxPackager::AppxPackager() {}
+AppxPackager::AppxPackager() {
+	package = NULL;
+}
 
 AppxPackager::~AppxPackager() {}
 
diff --git a/platform/windows/context_gl_windows.cpp b/platform/windows/context_gl_windows.cpp
index 86e39afb9da4..835339dc0fe7 100644
--- a/platform/windows/context_gl_windows.cpp
+++ b/platform/windows/context_gl_windows.cpp
@@ -230,6 +230,7 @@ ContextGL_Windows::ContextGL_Windows(HWND hwnd, bool p_opengl_3_context) {
 	hWnd = hwnd;
 	use_vsync = false;
 	vsync_via_compositor = false;
+	pixel_format = 0;
 }
 
 ContextGL_Windows::~ContextGL_Windows() {
diff --git a/platform/windows/joypad_windows.h b/platform/windows/joypad_windows.h
index 92303acf474f..e0386d61fba4 100644
--- a/platform/windows/joypad_windows.h
+++ b/platform/windows/joypad_windows.h
@@ -108,6 +108,7 @@ class JoypadWindows {
 			ff_timestamp = 0;
 			ff_end_timestamp = 0;
 			last_packet = 0;
+			id = 0;
 		}
 	};
 
diff --git a/platform/windows/os_windows.cpp b/platform/windows/os_windows.cpp
index e077f32a55df..e8408da42153 100755
--- a/platform/windows/os_windows.cpp
+++ b/platform/windows/os_windows.cpp
@@ -3737,6 +3737,32 @@ void OS_Windows::set_current_tablet_driver(const String &p_driver) {
 
 OS_Windows::OS_Windows(HINSTANCE _hInstance) {
 
+	min_pressure = 0;
+	max_pressure = 0;
+	tilt_supported = false;
+	last_pressure_update = 0;
+	last_pressure = 0;
+	ticks_per_second = 0;
+	ticks_start = 0;
+	outside = false;
+	old_x = 0;
+	old_y = 0;
+	visual_server = NULL;
+	move_timer_id = 0;
+	main_loop = NULL;
+	window_has_focus = false;
+	last_button_state = 0;
+	use_raw_input = false;
+	input = NULL;
+	joypad = NULL;
+	power_manager = NULL;
+	video_driver_index = 0;
+	process_map = NULL;
+	pre_fs_valid = false;
+	maximized = false;
+	borderless = false;
+	gl_context = NULL;
+
 	drop_events = false;
 	key_event_pos = 0;
 	layered_window = false;
diff --git a/platform/x11/joypad_linux.cpp b/platform/x11/joypad_linux.cpp
index 05d2e2b2dad9..17ce415d7512 100644
--- a/platform/x11/joypad_linux.cpp
+++ b/platform/x11/joypad_linux.cpp
@@ -54,6 +54,9 @@ JoypadLinux::Joypad::Joypad() {
 	fd = -1;
 	dpad = 0;
 	devpath = "";
+	force_feedback = false;
+	ff_effect_id = 0;
+	ff_effect_timestamp = 0;
 	for (int i = 0; i < MAX_ABS; i++) {
 		abs_info[i] = NULL;
 	}
diff --git a/platform/x11/os_x11.cpp b/platform/x11/os_x11.cpp
index 8c864cd3700c..cfd8fd68de77 100644
--- a/platform/x11/os_x11.cpp
+++ b/platform/x11/os_x11.cpp
@@ -3966,6 +3966,34 @@ void OS_X11::update_real_mouse_position() {
 
 OS_X11::OS_X11() {
 
+	xdnd_version = 0;
+	visual_server = NULL;
+	main_loop = NULL;
+	x11_display = NULL;
+	xmbstring = NULL;
+	xmblen = 0;
+	last_timestamp = 0;
+	im_active = false;
+	last_mouse_pos_valid = false;
+	last_click_ms = 0;
+	last_click_button_index = 0;
+	last_button_state = 0;
+	events_mutex = NULL;
+	force_quit = false;
+	window_has_focus = false;
+	do_mouse_warp = false;
+	cursor_theme = NULL;
+	cursor_size = 0;
+	input = NULL;
+	power_manager = NULL;
+	video_driver_index = 0;
+	maximized = false;
+	xrr_free_monitors = NULL;
+	xrr_get_monitors = NULL;
+	xrandr_handle = NULL;
+	joypad = NULL;
+	context_gl = NULL;
+
 #ifdef PULSEAUDIO_ENABLED
 	AudioDriverManager::add_driver(&driver_pulseaudio);
 #endif
diff --git a/scene/2d/camera_2d.cpp b/scene/2d/camera_2d.cpp
index 7db448ce921a..70478cfea97a 100644
--- a/scene/2d/camera_2d.cpp
+++ b/scene/2d/camera_2d.cpp
@@ -788,6 +788,8 @@ void Camera2D::_bind_methods() {
 
 Camera2D::Camera2D() {
 
+	viewport = NULL;
+
 	anchor_mode = ANCHOR_MODE_DRAG_CENTER;
 	rotating = false;
 	current = false;
diff --git a/scene/2d/light_occluder_2d.cpp b/scene/2d/light_occluder_2d.cpp
index 9b4109bb5e9c..0af19b933ebb 100644
--- a/scene/2d/light_occluder_2d.cpp
+++ b/scene/2d/light_occluder_2d.cpp
@@ -302,6 +302,7 @@ void LightOccluder2D::_bind_methods() {
 
 LightOccluder2D::LightOccluder2D() {
 
+	enabled = false;
 	occluder = VS::get_singleton()->canvas_light_occluder_create();
 	mask = 1;
 	set_notify_transform(true);
diff --git a/scene/2d/line_builder.cpp b/scene/2d/line_builder.cpp
index b9c004dfb9bc..49ab9c840ae8 100644
--- a/scene/2d/line_builder.cpp
+++ b/scene/2d/line_builder.cpp
@@ -93,6 +93,7 @@ static inline Vector2 interpolate(const Rect2 &r, const Vector2 &v) {
 //----------------------------------------------------------------------------
 
 LineBuilder::LineBuilder() {
+	texture_mode = Line2D::LineTextureMode::LINE_TEXTURE_NONE;
 	joint_mode = Line2D::LINE_JOINT_SHARP;
 	width = 10;
 	curve = NULL;
diff --git a/scene/2d/physics_body_2d.h b/scene/2d/physics_body_2d.h
index 1879b89da928..52e3abab2031 100644
--- a/scene/2d/physics_body_2d.h
+++ b/scene/2d/physics_body_2d.h
@@ -161,10 +161,15 @@ class RigidBody2D : public PhysicsBody2D {
 			return body_shape < p_sp.body_shape;
 		}
 
-		ShapePair() {}
+		ShapePair() {
+			body_shape = 0;
+			local_shape = 0;
+			tagged = false;
+		}
 		ShapePair(int p_bs, int p_ls) {
 			body_shape = p_bs;
 			local_shape = p_ls;
+			tagged = false;
 		}
 	};
 	struct RigidBody2D_RemoveAction {
diff --git a/scene/2d/tile_map.h b/scene/2d/tile_map.h
index 13ffb08fae92..2bd714ef16c2 100644
--- a/scene/2d/tile_map.h
+++ b/scene/2d/tile_map.h
@@ -173,7 +173,7 @@ class TileMap : public Node2D {
 			navpoly_ids = q.navpoly_ids;
 		}
 		Quadrant() :
-				dirty_list(this) {}
+				dirty_list(this) { shape_owner_id = 0; }
 	};
 
 	Map<PosKey, Quadrant> quadrant_map;
diff --git a/scene/3d/audio_stream_player_3d.h b/scene/3d/audio_stream_player_3d.h
index 2fd66d4f37dc..b0f921ff00b3 100644
--- a/scene/3d/audio_stream_player_3d.h
+++ b/scene/3d/audio_stream_player_3d.h
@@ -81,6 +81,7 @@ class AudioStreamPlayer3D : public Spatial {
 		Viewport *viewport; //pointer only used for reference to previous mix
 
 		Output() {
+			pitch_scale = 0;
 			filter_gain = 0;
 			viewport = NULL;
 			reverb_bus_index = -1;
diff --git a/scene/3d/light.cpp b/scene/3d/light.cpp
index 3e778aa0e241..0266dc0bc9b4 100644
--- a/scene/3d/light.cpp
+++ b/scene/3d/light.cpp
@@ -331,6 +331,12 @@ Light::Light(VisualServer::LightType p_type) {
 }
 
 Light::Light() {
+	shadow = false;
+	negative = false;
+	reverse_cull = false;
+	cull_mask = 0;
+	editor_only = false;
+	bake_mode = BakeMode::BAKE_ALL;
 
 	type = VisualServer::LIGHT_DIRECTIONAL;
 	ERR_PRINT("Light should not be instanced directly; use the DirectionalLight, OmniLight or SpotLight subtypes instead.");
diff --git a/scene/3d/soft_body.cpp b/scene/3d/soft_body.cpp
index bf3d6437ed81..5843e8e9d2eb 100644
--- a/scene/3d/soft_body.cpp
+++ b/scene/3d/soft_body.cpp
@@ -38,7 +38,12 @@
 #include "scene/3d/skeleton.h"
 #include "servers/physics_server.h"
 
-SoftBodyVisualServerHandler::SoftBodyVisualServerHandler() {}
+SoftBodyVisualServerHandler::SoftBodyVisualServerHandler() {
+	surface = 0;
+	stride = 0;
+	offset_vertices = 0;
+	offset_normal = 0;
+}
 
 void SoftBodyVisualServerHandler::prepare(RID p_mesh, int p_surface) {
 	clear();
@@ -707,6 +712,8 @@ SoftBody::SoftBody() :
 		pinned_points_cache_dirty(true),
 		ray_pickable(true) {
 
+	debug_mesh = NULL;
+	capture_input_on_drag = false;
 	PhysicsServer::get_singleton()->body_attach_object_instance_id(physics_rid, get_instance_id());
 }
 
diff --git a/scene/3d/sprite_3d.cpp b/scene/3d/sprite_3d.cpp
index 60442346f34b..6013cf72c9dc 100644
--- a/scene/3d/sprite_3d.cpp
+++ b/scene/3d/sprite_3d.cpp
@@ -1255,6 +1255,9 @@ void AnimatedSprite3D::_bind_methods() {
 
 AnimatedSprite3D::AnimatedSprite3D() {
 
+	centered = false;
+	hflip = false;
+	vflip = false;
 	frame = 0;
 	playing = false;
 	animation = "default";
diff --git a/scene/3d/vehicle_body.cpp b/scene/3d/vehicle_body.cpp
index 75cd0f5a92f3..8b5630f16c9d 100644
--- a/scene/3d/vehicle_body.cpp
+++ b/scene/3d/vehicle_body.cpp
@@ -388,6 +388,9 @@ VehicleWheel::VehicleWheel() {
 
 	m_suspensionRelativeVelocity = 0;
 	m_clippedInvContactDotSuspension = 1.0;
+
+	m_raycastInfo.m_suspensionLength = 0;
+	m_raycastInfo.m_groundObject = NULL;
 	m_raycastInfo.m_isInContact = false;
 	m_raycastInfo.m_suspensionLength = 0.0;
 
diff --git a/scene/3d/voxel_light_baker.cpp b/scene/3d/voxel_light_baker.cpp
index 0af8cbf20c18..c6a988311531 100644
--- a/scene/3d/voxel_light_baker.cpp
+++ b/scene/3d/voxel_light_baker.cpp
@@ -1610,6 +1610,17 @@ Transform VoxelLightBaker::get_to_cell_space_xform() const {
 	return to_cell_space;
 }
 VoxelLightBaker::VoxelLightBaker() {
+	cell_subdiv = 0;
+	first_leaf = 0;
+	leaf_voxel_count = 0;
+	direct_lights_baked = false;
+	axis_cell_size[0] = 0;
+	axis_cell_size[1] = 0;
+	axis_cell_size[2] = 0;
+	cell_size = 0;
+	bake_quality = BakeQuality::BAKE_QUALITY_HIGH;
+	max_original_cells = 0;
+
 	color_scan_cell_width = 4;
 	bake_texture_size = 128;
 	propagation = 0.85;
diff --git a/scene/animation/animation_tree.h b/scene/animation/animation_tree.h
index 39e2e7732c3b..6f28f0e66498 100644
--- a/scene/animation/animation_tree.h
+++ b/scene/animation/animation_tree.h
@@ -202,6 +202,7 @@ class AnimationTree : public Node {
 		Vector3 scale;
 
 		TrackCacheTransform() {
+			rot_blend_accum = 0;
 			type = Animation::TYPE_TRANSFORM;
 			spatial = NULL;
 			bone_idx = -1;
diff --git a/scene/animation/animation_tree_player.h b/scene/animation/animation_tree_player.h
index 53ef72275ea2..98a52a982c65 100644
--- a/scene/animation/animation_tree_player.h
+++ b/scene/animation/animation_tree_player.h
@@ -138,7 +138,10 @@ class AnimationTreePlayer : public Node {
 
 		Vector<Input> inputs;
 
-		NodeBase() { cycletest = false; };
+		NodeBase() {
+			type = NODE_MAX;
+			cycletest = false;
+		};
 		virtual ~NodeBase() { cycletest = false; }
 	};
 
@@ -171,6 +174,8 @@ class AnimationTreePlayer : public Node {
 		HashMap<NodePath, bool> filter;
 
 		AnimationNode() {
+			time = 0;
+			step = 0;
 			type = NODE_ANIMATION;
 			next = NULL;
 			last_version = 0;
@@ -197,6 +202,9 @@ class AnimationTreePlayer : public Node {
 		HashMap<NodePath, bool> filter;
 
 		OneShotNode() {
+			autorestart_random_delay = 0;
+			time = 0;
+			remaining = 0;
 			type = NODE_ONESHOT;
 			fade_in = 0;
 			fade_out = 0;
@@ -214,6 +222,7 @@ class AnimationTreePlayer : public Node {
 
 		float amount;
 		MixNode() {
+			amount = 0;
 			type = NODE_MIX;
 			inputs.resize(2);
 		}
@@ -291,6 +300,7 @@ class AnimationTreePlayer : public Node {
 		float xfade;
 
 		TransitionNode() {
+			time = 0;
 			type = NODE_TRANSITION;
 			xfade = 0;
 			inputs.resize(1);
diff --git a/scene/animation/root_motion_view.cpp b/scene/animation/root_motion_view.cpp
index 2c1ece2c8eb9..b7221f151a65 100644
--- a/scene/animation/root_motion_view.cpp
+++ b/scene/animation/root_motion_view.cpp
@@ -193,6 +193,8 @@ void RootMotionView::_bind_methods() {
 }
 
 RootMotionView::RootMotionView() {
+	use_in_game = false;
+	first = false;
 	zero_y = true;
 	radius = 10;
 	cell_size = 1;
diff --git a/scene/animation/skeleton_ik.h b/scene/animation/skeleton_ik.h
index d646a883d3d5..bc0f700d922b 100644
--- a/scene/animation/skeleton_ik.h
+++ b/scene/animation/skeleton_ik.h
@@ -114,7 +114,8 @@ class FabrikInverseKinematic {
 				skeleton(NULL),
 				min_distance(0.01),
 				max_iterations(10),
-				root_bone(-1) {}
+				root_bone(-1) {
+		}
 	};
 
 private:
diff --git a/scene/animation/tween.h b/scene/animation/tween.h
index 2033faf6c0d8..6dbc828e8482 100644
--- a/scene/animation/tween.h
+++ b/scene/animation/tween.h
@@ -102,6 +102,10 @@ class Tween : public Node {
 		Variant arg[5];
 		int uid;
 		InterpolateData() {
+			type = InterpolateType::FOLLOW_METHOD;
+			trans_type = TransitionType::TRANS_BACK;
+			ease_type = EaseType::EASE_COUNT;
+			args = 0;
 			active = false;
 			finish = false;
 			call_deferred = false;
diff --git a/scene/debugger/script_debugger_remote.cpp b/scene/debugger/script_debugger_remote.cpp
index 2537e7850590..5eb3173f7a0f 100644
--- a/scene/debugger/script_debugger_remote.cpp
+++ b/scene/debugger/script_debugger_remote.cpp
@@ -1270,6 +1270,12 @@ ScriptDebuggerRemote::ScriptDebuggerRemote() :
 		locking(false),
 		poll_every(0),
 		scene_tree(NULL) {
+	frame_time = 0;
+	idle_time = 0;
+	physics_time = 0;
+	physics_frame_time = 0;
+	n_warnings_dropped = 0;
+	skip_breakpoints = false;
 
 	packet_peer_stream->set_stream_peer(tcp_client);
 	packet_peer_stream->set_output_buffer_max_size((1024 * 1024 * 8) - 4); // 8 MiB should be way more than enough, minus 4 bytes for separator.
diff --git a/scene/gui/popup_menu.h b/scene/gui/popup_menu.h
index a6611299bbb9..40be31c071f9 100644
--- a/scene/gui/popup_menu.h
+++ b/scene/gui/popup_menu.h
@@ -63,6 +63,7 @@ class PopupMenu : public Popup {
 		bool shortcut_is_disabled;
 
 		Item() {
+			id = 0;
 			checked = false;
 			checkable_type = CHECKABLE_TYPE_NONE;
 			separator = false;
diff --git a/scene/gui/rich_text_label.h b/scene/gui/rich_text_label.h
index 38299fb439c7..93bcfa3078d4 100644
--- a/scene/gui/rich_text_label.h
+++ b/scene/gui/rich_text_label.h
@@ -98,6 +98,10 @@ class RichTextLabel : public Control {
 		int maximum_width;
 
 		Line() {
+			height_cache = 0;
+			height_accum_cache = 0;
+			minimum_width = 0;
+			maximum_width = 0;
 			from = NULL;
 			char_count = 0;
 		}
@@ -119,6 +123,8 @@ class RichTextLabel : public Control {
 		}
 
 		Item() {
+			index = 0;
+			type = ItemType::ITEM_ALIGN;
 			parent = NULL;
 			E = NULL;
 			line = 0;
@@ -134,6 +140,7 @@ class RichTextLabel : public Control {
 		ItemFrame *parent_frame;
 
 		ItemFrame() {
+			first_invalid_line = 0;
 			type = ITEM_FRAME;
 			parent_frame = NULL;
 			cell = false;
@@ -177,17 +184,26 @@ class RichTextLabel : public Control {
 
 	struct ItemAlign : public Item {
 		Align align;
-		ItemAlign() { type = ITEM_ALIGN; }
+		ItemAlign() {
+			type = ITEM_ALIGN;
+			align = Align::ALIGN_CENTER;
+		}
 	};
 
 	struct ItemIndent : public Item {
 		int level;
-		ItemIndent() { type = ITEM_INDENT; }
+		ItemIndent() {
+			type = ITEM_INDENT;
+			level = 0;
+		}
 	};
 
 	struct ItemList : public Item {
 		ListType list_type;
-		ItemList() { type = ITEM_LIST; }
+		ItemList() {
+			type = ITEM_LIST;
+			list_type = ListType::LIST_DOTS;
+		}
 	};
 
 	struct ItemNewline : public Item {
@@ -205,14 +221,21 @@ class RichTextLabel : public Control {
 
 		Vector<Column> columns;
 		int total_width;
-		ItemTable() { type = ITEM_TABLE; }
+		ItemTable() {
+			total_width = 0;
+			type = ITEM_TABLE;
+		}
 	};
 
 	struct ItemFade : public Item {
 		int starting_index;
 		int length;
 
-		ItemFade() { type = ITEM_FADE; }
+		ItemFade() {
+			type = ITEM_FADE;
+			starting_index = 0;
+			length = 0;
+		}
 	};
 
 	struct ItemFX : public Item {
@@ -230,6 +253,7 @@ class RichTextLabel : public Control {
 		uint64_t _previous_rng;
 
 		ItemShake() {
+			_previous_rng = 0;
 			strength = 0;
 			rate = 0.0f;
 			_current_rng = 0;
diff --git a/scene/gui/scroll_bar.cpp b/scene/gui/scroll_bar.cpp
index 4ab41e9166ff..8f9648f9ef1e 100644
--- a/scene/gui/scroll_bar.cpp
+++ b/scene/gui/scroll_bar.cpp
@@ -668,6 +668,10 @@ void ScrollBar::_bind_methods() {
 
 ScrollBar::ScrollBar(Orientation p_orientation) {
 
+	last_drag_node_time = 0;
+	time_since_motion = 0;
+	click_handled = false;
+
 	orientation = p_orientation;
 	highlight = HIGHLIGHT_NONE;
 	custom_step = -1;
diff --git a/scene/gui/split_container.cpp b/scene/gui/split_container.cpp
index d88badf28730..4c18e9e0722c 100644
--- a/scene/gui/split_container.cpp
+++ b/scene/gui/split_container.cpp
@@ -360,6 +360,8 @@ void SplitContainer::_bind_methods() {
 
 SplitContainer::SplitContainer(bool p_vertical) {
 
+	drag_from = 0;
+	drag_ofs = 0;
 	mouse_inside = false;
 	split_offset = 0;
 	should_clamp_split_offset = false;
diff --git a/scene/gui/text_edit.h b/scene/gui/text_edit.h
index 344c690a3caa..5dfd307913b2 100644
--- a/scene/gui/text_edit.h
+++ b/scene/gui/text_edit.h
@@ -149,7 +149,10 @@ class TextEdit : public Control {
 		void clear_wrap_cache();
 		void clear_info_icons();
 		_FORCE_INLINE_ const String &operator[](int p_line) const { return text[p_line].data; }
-		Text() { indent_size = 4; }
+		Text() {
+			indent_size = 4;
+			color_regions = NULL;
+		}
 	};
 
 private:
diff --git a/scene/gui/tree.h b/scene/gui/tree.h
index 6215e4a12545..b1c4aa9d4779 100644
--- a/scene/gui/tree.h
+++ b/scene/gui/tree.h
@@ -112,6 +112,7 @@ class TreeItem : public Object {
 
 		Cell() {
 
+			custom_bg_outline = false;
 			custom_draw_obj = 0;
 			custom_button = false;
 			mode = TreeItem::CELL_MODE_STRING;
diff --git a/scene/main/node.h b/scene/main/node.h
index 1f8ec7387963..8f4080dce14b 100644
--- a/scene/main/node.h
+++ b/scene/main/node.h
@@ -82,7 +82,10 @@ class Node : public Object {
 
 		bool persistent;
 		SceneTree::Group *group;
-		GroupData() { persistent = false; }
+		GroupData() {
+			persistent = false;
+			group = NULL;
+		}
 	};
 
 	struct Data {
diff --git a/scene/main/viewport.cpp b/scene/main/viewport.cpp
index 07efa4973d6c..6fbb2940a12b 100644
--- a/scene/main/viewport.cpp
+++ b/scene/main/viewport.cpp
@@ -194,6 +194,15 @@ class TooltipLabel : public Label {
 
 Viewport::GUI::GUI() {
 
+	key_event_accepted = false;
+	last_mouse_focus = NULL;
+	drag_attempted = false;
+	drag_preview = NULL;
+	tooltip_timer = 0;
+	tooltip_delay = 0;
+	roots_order_dirty = false;
+	canvas_sort_index = 0;
+
 	dragging = false;
 	mouse_focus = NULL;
 	mouse_click_grabber = NULL;
diff --git a/scene/resources/animation.h b/scene/resources/animation.h
index 0f8aa08f2b68..7500847f52a6 100644
--- a/scene/resources/animation.h
+++ b/scene/resources/animation.h
@@ -72,6 +72,7 @@ class Animation : public Resource {
 		bool imported;
 		bool enabled;
 		Track() {
+			type = TrackType::TYPE_ANIMATION;
 			interpolation = INTERPOLATION_LINEAR;
 			imported = false;
 			loop_wrap = true;
@@ -84,7 +85,10 @@ class Animation : public Resource {
 
 		float transition;
 		float time; // time in secs
-		Key() { transition = 1; }
+		Key() {
+			transition = 1;
+			time = 0;
+		}
 	};
 
 	// transform key holds either Vector3 or Quaternion
@@ -121,6 +125,7 @@ class Animation : public Resource {
 		ValueTrack() {
 			type = TYPE_VALUE;
 			update_mode = UPDATE_CONTINUOUS;
+			update_on_seek = false;
 		}
 	};
 
diff --git a/scene/resources/dynamic_font.cpp b/scene/resources/dynamic_font.cpp
index 2f5a2131e904..1b8f18c49933 100644
--- a/scene/resources/dynamic_font.cpp
+++ b/scene/resources/dynamic_font.cpp
@@ -1042,6 +1042,7 @@ SelfList<DynamicFont>::List *DynamicFont::dynamic_fonts = NULL;
 DynamicFont::DynamicFont() :
 		font_list(this) {
 
+	valid = false;
 	cache_id.size = 16;
 	outline_cache_id.size = 16;
 	spacing_top = 0;
diff --git a/scene/resources/dynamic_font.h b/scene/resources/dynamic_font.h
index 05509451cc1e..50a9262b5c89 100644
--- a/scene/resources/dynamic_font.h
+++ b/scene/resources/dynamic_font.h
@@ -151,6 +151,9 @@ class DynamicFontAtSize : public Reference {
 		float advance;
 
 		Character() {
+			found = false;
+			h_align = 0;
+			advance = 0;
 			texture_idx = 0;
 			v_align = 0;
 		}
diff --git a/scene/resources/font.h b/scene/resources/font.h
index c2451e3f6de0..cab21b972659 100644
--- a/scene/resources/font.h
+++ b/scene/resources/font.h
@@ -122,6 +122,8 @@ class BitmapFont : public Font {
 		Character() {
 			texture_idx = 0;
 			v_align = 0;
+			h_align = 0;
+			advance = 0;
 		}
 	};
 
diff --git a/scene/resources/resource_format_text.cpp b/scene/resources/resource_format_text.cpp
index 709366444c3e..b30c20052861 100644
--- a/scene/resources/resource_format_text.cpp
+++ b/scene/resources/resource_format_text.cpp
@@ -665,6 +665,12 @@ void ResourceInteractiveLoaderText::set_translation_remapped(bool p_remapped) {
 }
 
 ResourceInteractiveLoaderText::ResourceInteractiveLoaderText() {
+	f = NULL;
+	is_scene = false;
+	ignore_resource_parsing = false;
+	resources_total = 0;
+	resource_current = 0;
+	lines = 0;
 	translation_remapped = false;
 }
 
diff --git a/scene/resources/visual_shader.cpp b/scene/resources/visual_shader.cpp
index 47db5e677a29..0cdc4a61ffe8 100644
--- a/scene/resources/visual_shader.cpp
+++ b/scene/resources/visual_shader.cpp
@@ -2296,6 +2296,7 @@ String VisualShaderNodeOutput::generate_code(Shader::Mode p_mode, VisualShader::
 }
 
 VisualShaderNodeOutput::VisualShaderNodeOutput() {
+	shader_type = VisualShader::Type::TYPE_MAX;
 }
 
 ///////////////////////////
diff --git a/servers/arvr_server.cpp b/servers/arvr_server.cpp
index 641d23f93507..d6dab63b401d 100644
--- a/servers/arvr_server.cpp
+++ b/servers/arvr_server.cpp
@@ -368,6 +368,9 @@ void ARVRServer::_mark_commit() {
 
 ARVRServer::ARVRServer() {
 	singleton = this;
+	last_process_usec = 0;
+	last_commit_usec = 0;
+	last_frame_usec = 0;
 	world_scale = 1.0;
 };
 
diff --git a/servers/audio/audio_driver_dummy.cpp b/servers/audio/audio_driver_dummy.cpp
index 6bdede0cc860..1c43e97ca126 100644
--- a/servers/audio/audio_driver_dummy.cpp
+++ b/servers/audio/audio_driver_dummy.cpp
@@ -127,6 +127,13 @@ void AudioDriverDummy::finish() {
 
 AudioDriverDummy::AudioDriverDummy() {
 
+	samples_in = NULL;
+	buffer_frames = 0;
+	mix_rate = 0;
+	channels = 0;
+	active = false;
+	thread_exited = false;
+	exit_thread = false;
 	mutex = NULL;
 	thread = NULL;
 };
diff --git a/servers/audio/audio_stream.cpp b/servers/audio/audio_stream.cpp
index def5f0d1642f..4183781af8c1 100644
--- a/servers/audio/audio_stream.cpp
+++ b/servers/audio/audio_stream.cpp
@@ -234,6 +234,8 @@ AudioStreamPlaybackMicrophone::~AudioStreamPlaybackMicrophone() {
 }
 
 AudioStreamPlaybackMicrophone::AudioStreamPlaybackMicrophone() {
+	active = false;
+	input_ofs = 0;
 }
 
 ////////////////////////////////
diff --git a/servers/audio/effects/audio_effect_pitch_shift.cpp b/servers/audio/effects/audio_effect_pitch_shift.cpp
index 8dc88ddff0b0..f3fdd4e1e33c 100644
--- a/servers/audio/effects/audio_effect_pitch_shift.cpp
+++ b/servers/audio/effects/audio_effect_pitch_shift.cpp
@@ -360,6 +360,9 @@ void AudioEffectPitchShift::_bind_methods() {
 }
 
 AudioEffectPitchShift::AudioEffectPitchShift() {
+	wet = 0;
+	dry = 0;
+	filter = false;
 	pitch_scale = 1.0;
 	oversampling = 4;
 	fft_size = FFT_SIZE_2048;
diff --git a/servers/audio/effects/audio_effect_record.cpp b/servers/audio/effects/audio_effect_record.cpp
index 22392ec02bad..f14b4fbf501a 100644
--- a/servers/audio/effects/audio_effect_record.cpp
+++ b/servers/audio/effects/audio_effect_record.cpp
@@ -136,6 +136,11 @@ void AudioEffectRecordInstance::finish() {
 
 AudioEffectRecordInstance::~AudioEffectRecordInstance() {
 
+	is_recording = false;
+	io_thread = NULL;
+	ring_buffer_pos = 0;
+	ring_buffer_mask = 0;
+	ring_buffer_read_pos = 0;
 	finish();
 }
 
diff --git a/servers/audio/effects/audio_effect_record.h b/servers/audio/effects/audio_effect_record.h
index 7fc046440e3c..b9b124bc38ba 100644
--- a/servers/audio/effects/audio_effect_record.h
+++ b/servers/audio/effects/audio_effect_record.h
@@ -72,7 +72,13 @@ class AudioEffectRecordInstance : public AudioEffectInstance {
 	virtual bool process_silence() const;
 
 	AudioEffectRecordInstance() :
-			thread_active(false) {}
+			thread_active(false) {
+		is_recording = false;
+		io_thread = NULL;
+		ring_buffer_pos = 0;
+		ring_buffer_mask = 0;
+		ring_buffer_read_pos = 0;
+	}
 	~AudioEffectRecordInstance();
 };
 
diff --git a/servers/audio/effects/audio_effect_stereo_enhance.cpp b/servers/audio/effects/audio_effect_stereo_enhance.cpp
index a17ffc33e3b1..f357151fddfc 100644
--- a/servers/audio/effects/audio_effect_stereo_enhance.cpp
+++ b/servers/audio/effects/audio_effect_stereo_enhance.cpp
@@ -152,6 +152,7 @@ void AudioEffectStereoEnhance::_bind_methods() {
 }
 
 AudioEffectStereoEnhance::AudioEffectStereoEnhance() {
+	volume_db = 0;
 	pan_pullout = 1;
 	time_pullout = 0;
 	surround = 0;
diff --git a/servers/audio/effects/reverb.h b/servers/audio/effects/reverb.h
index 22ae59385ab7..1cd0dea13ee3 100644
--- a/servers/audio/effects/reverb.h
+++ b/servers/audio/effects/reverb.h
@@ -67,6 +67,8 @@ class Reverb {
 		int extra_spread_frames;
 
 		Comb() {
+			damp = 0;
+			extra_spread_frames = 0;
 			size = 0;
 			buffer = 0;
 			feedback = 0;
@@ -85,6 +87,7 @@ class Reverb {
 			size = 0;
 			buffer = 0;
 			pos = 0;
+			extra_spread_frames = 0;
 		}
 	};
 
diff --git a/servers/camera/camera_feed.cpp b/servers/camera/camera_feed.cpp
index 65f876e4fd35..8d06e68fd4cb 100644
--- a/servers/camera/camera_feed.cpp
+++ b/servers/camera/camera_feed.cpp
@@ -136,6 +136,8 @@ RID CameraFeed::get_texture(CameraServer::FeedImage p_which) {
 CameraFeed::CameraFeed() {
 	// initialize our feed
 	id = CameraServer::get_singleton()->get_free_id();
+	base_height = 0;
+	base_width = 0;
 	name = "???";
 	active = false;
 	datatype = CameraFeed::FEED_RGB;
diff --git a/servers/physics/collision_object_sw.h b/servers/physics/collision_object_sw.h
index e352ccc99d80..63f689d9d990 100644
--- a/servers/physics/collision_object_sw.h
+++ b/servers/physics/collision_object_sw.h
@@ -68,7 +68,11 @@ class CollisionObjectSW : public ShapeOwnerSW {
 		ShapeSW *shape;
 		bool disabled;
 
-		Shape() { disabled = false; }
+		Shape() {
+			disabled = false;
+			bpid = 0;
+			shape = NULL;
+		}
 	};
 
 	Vector<Shape> shapes;
diff --git a/servers/physics/constraint_sw.h b/servers/physics/constraint_sw.h
index 0588cbc4518a..a89ecaaba36e 100644
--- a/servers/physics/constraint_sw.h
+++ b/servers/physics/constraint_sw.h
@@ -47,6 +47,8 @@ class ConstraintSW : public RID_Data {
 
 protected:
 	ConstraintSW(BodySW **p_body_ptr = NULL, int p_body_count = 0) {
+		island_next = NULL;
+		island_list_next = NULL;
 		_body_ptr = p_body_ptr;
 		_body_count = p_body_count;
 		island_step = 0;
diff --git a/servers/physics/gjk_epa.cpp b/servers/physics/gjk_epa.cpp
index ac747101c9f6..47a319eb85f8 100644
--- a/servers/physics/gjk_epa.cpp
+++ b/servers/physics/gjk_epa.cpp
@@ -169,6 +169,7 @@ struct	GJK
 		}
 		void				Initialize()
 		{
+			m_simplex   =   nullptr;
 			m_ray		=	Vector3(0,0,0);
 			m_nfree		=	0;
 			m_status	=	eStatus::Failed;
diff --git a/servers/physics/physics_server_sw.cpp b/servers/physics/physics_server_sw.cpp
index 0e20a597993e..40cbd438cf30 100644
--- a/servers/physics/physics_server_sw.cpp
+++ b/servers/physics/physics_server_sw.cpp
@@ -1580,6 +1580,10 @@ PhysicsServerSW::PhysicsServerSW() {
 	active_objects = 0;
 	collision_pairs = 0;
 
+	iterations = 0;
+	stepper = NULL;
+	direct_state = NULL;
+
 	active = true;
 	flushing_queries = false;
 };
diff --git a/servers/physics/shape_sw.h b/servers/physics/shape_sw.h
index 9f39a5f0b45f..9cc5e47884ce 100644
--- a/servers/physics/shape_sw.h
+++ b/servers/physics/shape_sw.h
@@ -465,7 +465,10 @@ struct MotionShapeSW : public ShapeSW {
 	virtual void set_data(const Variant &p_data) {}
 	virtual Variant get_data() const { return Variant(); }
 
-	MotionShapeSW() { configure(AABB()); }
+	MotionShapeSW() {
+		configure(AABB());
+		shape = NULL;
+	}
 };
 
 struct _ShapeTestConvexBSPSW {
diff --git a/servers/physics_2d/broad_phase_2d_hash_grid.cpp b/servers/physics_2d/broad_phase_2d_hash_grid.cpp
index be73d908deed..c0686f7b2e01 100644
--- a/servers/physics_2d/broad_phase_2d_hash_grid.cpp
+++ b/servers/physics_2d/broad_phase_2d_hash_grid.cpp
@@ -633,6 +633,9 @@ BroadPhase2DSW *BroadPhase2DHashGrid::_create() {
 
 BroadPhase2DHashGrid::BroadPhase2DHashGrid() {
 
+	pair_userdata = NULL;
+	unpair_userdata = NULL;
+
 	hash_table_size = GLOBAL_DEF("physics/2d/bp_hash_table_size", 4096);
 	ProjectSettings::get_singleton()->set_custom_property_info("physics/2d/bp_hash_table_size", PropertyInfo(Variant::INT, "physics/2d/bp_hash_table_size", PROPERTY_HINT_RANGE, "0,8192,1,or_greater"));
 	hash_table_size = Math::larger_prime(hash_table_size);
diff --git a/servers/physics_2d/collision_solver_2d_sat.cpp b/servers/physics_2d/collision_solver_2d_sat.cpp
index 75390e74e81f..0fccac7a8c85 100644
--- a/servers/physics_2d/collision_solver_2d_sat.cpp
+++ b/servers/physics_2d/collision_solver_2d_sat.cpp
@@ -189,8 +189,10 @@ class SeparatorAxisTest2D {
 	const Transform2D *transform_B;
 	real_t best_depth;
 	Vector2 best_axis;
+#ifdef DEBUG_ENABLED
 	int best_axis_count;
 	int best_axis_index;
+#endif
 	Vector2 motion_A;
 	Vector2 motion_B;
 	real_t margin_A;
diff --git a/servers/physics_2d/constraint_2d_sw.h b/servers/physics_2d/constraint_2d_sw.h
index f9e872bc7827..b783a787f7ae 100644
--- a/servers/physics_2d/constraint_2d_sw.h
+++ b/servers/physics_2d/constraint_2d_sw.h
@@ -46,6 +46,8 @@ class Constraint2DSW : public RID_Data {
 
 protected:
 	Constraint2DSW(Body2DSW **p_body_ptr = NULL, int p_body_count = 0) {
+		island_list_next = NULL;
+		island_next = NULL;
 		_body_ptr = p_body_ptr;
 		_body_count = p_body_count;
 		island_step = 0;
diff --git a/servers/physics_2d/physics_2d_server_sw.cpp b/servers/physics_2d/physics_2d_server_sw.cpp
index dd1e78d094e6..740cb303e938 100644
--- a/servers/physics_2d/physics_2d_server_sw.cpp
+++ b/servers/physics_2d/physics_2d_server_sw.cpp
@@ -1439,6 +1439,11 @@ Physics2DServerSW *Physics2DServerSW::singletonsw = NULL;
 
 Physics2DServerSW::Physics2DServerSW() {
 
+	iterations = 0;
+	doing_sync = false;
+	stepper = NULL;
+	direct_state = NULL;
+
 	singletonsw = this;
 	BroadPhase2DSW::create_func = BroadPhase2DHashGrid::_create;
 	//BroadPhase2DSW::create_func=BroadPhase2DBasic::_create;
diff --git a/servers/physics_2d/shape_2d_sw.h b/servers/physics_2d/shape_2d_sw.h
index 1114934d3271..d20e18d1d320 100644
--- a/servers/physics_2d/shape_2d_sw.h
+++ b/servers/physics_2d/shape_2d_sw.h
@@ -227,8 +227,14 @@ class RayShape2DSW : public Shape2DSW {
 
 	DEFAULT_PROJECT_RANGE_CAST
 
-	_FORCE_INLINE_ RayShape2DSW() {}
-	_FORCE_INLINE_ RayShape2DSW(real_t p_length) { length = p_length; }
+	_FORCE_INLINE_ RayShape2DSW() {
+		slips_on_slope = false;
+		length = 0;
+	}
+	_FORCE_INLINE_ RayShape2DSW(real_t p_length) {
+		length = p_length;
+		slips_on_slope = false;
+	}
 };
 
 class SegmentShape2DSW : public Shape2DSW {
diff --git a/servers/visual/rasterizer.h b/servers/visual/rasterizer.h
index 894b782f5b38..5a08ebbb8f9f 100644
--- a/servers/visual/rasterizer.h
+++ b/servers/visual/rasterizer.h
@@ -128,6 +128,8 @@ class RasterizerScene {
 		InstanceBase() :
 				dependency_item(this) {
 
+			mirror = false;
+			depth = 0;
 			base_type = VS::INSTANCE_NONE;
 			cast_shadows = VS::SHADOW_CASTING_SETTING_ON;
 			receive_shadows = true;
@@ -664,6 +666,8 @@ class RasterizerCanvas {
 		RID light_internal;
 
 		Light() {
+			radius_cache = 0;
+			shadows_next_ptr = NULL;
 			enabled = true;
 			color = Color(1, 1, 1);
 			shadow_color = Color(0, 0, 0, 0);
@@ -722,7 +726,11 @@ class RasterizerCanvas {
 			Color color;
 			float width;
 			bool antialiased;
-			CommandLine() { type = TYPE_LINE; }
+			CommandLine() {
+				type = TYPE_LINE;
+				width = 0;
+				antialiased = false;
+			}
 		};
 		struct CommandPolyLine : public Command {
 
@@ -768,6 +776,9 @@ class RasterizerCanvas {
 			CommandNinePatch() {
 				draw_center = true;
 				type = TYPE_NINEPATCH;
+				for (int i = 0; i < 4; i++) {
+					margin[i] = 0;
+				}
 			}
 		};
 
@@ -803,6 +814,8 @@ class RasterizerCanvas {
 			CommandPolygon() {
 				type = TYPE_POLYGON;
 				count = 0;
+				antialiased = false;
+				antialiasing_use_indices = false;
 			}
 		};
 
@@ -837,7 +850,10 @@ class RasterizerCanvas {
 			Point2 pos;
 			float radius;
 			Color color;
-			CommandCircle() { type = TYPE_CIRCLE; }
+			CommandCircle() {
+				type = TYPE_CIRCLE;
+				radius = 0;
+			}
 		};
 
 		struct CommandTransform : public Command {
diff --git a/servers/visual/shader_language.cpp b/servers/visual/shader_language.cpp
index 3f6f99938ff7..b88173cce2fd 100644
--- a/servers/visual/shader_language.cpp
+++ b/servers/visual/shader_language.cpp
@@ -5926,6 +5926,16 @@ ShaderLanguage::ShaderNode *ShaderLanguage::get_shader() {
 
 ShaderLanguage::ShaderLanguage() {
 
+	error_set = false;
+	error_line = 0;
+	char_idx = 0;
+	tk_line = 0;
+	shader = NULL;
+	completion_type = CompletionType::COMPLETION_CALL_ARGUMENTS;
+	completion_line = 0;
+	completion_block = NULL;
+	completion_base = DataType::TYPE_BOOL;
+	completion_argument = 0;
 	nodes = NULL;
 	completion_class = TAG_GLOBAL;
 }
diff --git a/servers/visual/visual_server_scene.cpp b/servers/visual/visual_server_scene.cpp
index c4c2a3186996..40446ad4189e 100644
--- a/servers/visual/visual_server_scene.cpp
+++ b/servers/visual/visual_server_scene.cpp
@@ -3672,6 +3672,14 @@ bool VisualServerScene::free(RID p_rid) {
 VisualServerScene *VisualServerScene::singleton = NULL;
 
 VisualServerScene::VisualServerScene() {
+	instance_cull_count = 0;
+	light_cull_count = 0;
+	directional_light_count = 0;
+	reflection_probe_cull_count = 0;
+	probe_bake_mutex = NULL;
+	probe_bake_sem = NULL;
+	probe_bake_thread = NULL;
+	probe_bake_thread_exit = false;
 
 #ifndef NO_THREADS
 	probe_bake_sem = Semaphore::create();
diff --git a/servers/visual/visual_server_scene.h b/servers/visual/visual_server_scene.h
index 6c4798b609ce..8bab3e485768 100644
--- a/servers/visual/visual_server_scene.h
+++ b/servers/visual/visual_server_scene.h
@@ -346,6 +346,7 @@ class VisualServerScene {
 		InstanceReflectionProbeData() :
 				update_list(this) {
 
+			owner = NULL;
 			reflection_dirty = true;
 			render_step = -1;
 		}
@@ -479,6 +480,7 @@ class VisualServerScene {
 
 		InstanceGIProbeData() :
 				update_element(this) {
+			owner = NULL;
 			invalid = true;
 			base_version = 0;
 			dynamic.updating_stage = GI_UPDATE_STAGE_CHECK;
diff --git a/servers/visual/visual_server_viewport.h b/servers/visual/visual_server_viewport.h
index 7cab3a4bba0e..c609dd6151f7 100644
--- a/servers/visual/visual_server_viewport.h
+++ b/servers/visual/visual_server_viewport.h
@@ -110,6 +110,9 @@ class VisualServerViewport {
 		Map<RID, CanvasData> canvas_map;
 
 		Viewport() {
+			viewport_render_direct_to_screen = false;
+			hide_canvas = false;
+			hide_scenario = false;
 			update_mode = VS::VIEWPORT_UPDATE_WHEN_VISIBLE;
 			clear_mode = VS::VIEWPORT_CLEAR_ALWAYS;
 			transparent_bg = false;
diff --git a/servers/visual_server.cpp b/servers/visual_server.cpp
index f022651a8ad5..6f564e90414d 100644
--- a/servers/visual_server.cpp
+++ b/servers/visual_server.cpp
@@ -2389,6 +2389,8 @@ void VisualServer::set_render_loop_enabled(bool p_enabled) {
 
 VisualServer::VisualServer() {
 
+	mm_policy = 0;
+
 	//ERR_FAIL_COND(singleton);
 	singleton = this;