commit 5be8beb69fdeb88a325fcb72ea1e7e3fd0086430
Author: Patrick Wuttke <mewin@mewin.de>
Date:   Sat Aug 7 21:13:07 2021 +0200

    Initial commit

diff --git a/plugin.cfg b/plugin.cfg
new file mode 100644
index 0000000..f9c42dd
--- /dev/null
+++ b/plugin.cfg
@@ -0,0 +1,7 @@
+[plugin]
+
+name="GDScript Basics"
+description="Basic (and advanced) utility for gdscript."
+author="Patrick Wuttke<mewin@mewin.de>"
+version="0.2"
+script="plugin.gd"
diff --git a/plugin.gd b/plugin.gd
new file mode 100644
index 0000000..824ed80
--- /dev/null
+++ b/plugin.gd
@@ -0,0 +1,8 @@
+tool
+extends EditorPlugin
+
+func _enter_tree():
+	pass
+
+func _exit_tree():
+	pass
diff --git a/scripts/libs/algorithm.gd b/scripts/libs/algorithm.gd
new file mode 100644
index 0000000..96a1606
--- /dev/null
+++ b/scripts/libs/algorithm.gd
@@ -0,0 +1,118 @@
+###
+### algorithmic utility
+###
+extends Object
+
+class_name GDBAlgorithm
+
+class __SortBy:
+	var prop_name := ""
+	var descending := false
+	
+	func __sort(obj0, obj1):
+		var res = obj0.get(prop_name) < obj1.get(prop_name)
+		if descending:
+			return !res
+		return res
+
+################
+# public stuff #
+################
+func _init() -> void:
+	assert(0, "This class should not be instantiated.")
+
+# Packs source code into a small script object, like a lambda in other languages.
+# This function can then be called by calling the "eval" (or whatever you pass as
+# fn_name) function of the object. This is especially useful for GDScript functions
+# like "sort_custom" which take an object and a function as parameters.
+#
+# Example:
+# var names := ["Bob", "Alice", "Elfriede"]
+# names.sort_custom(GDBAlgorithm.lambda("return name0.substr(1) < name1.substr(1)", ["name0", "name1"]), "eval")
+# print(names) # prints "[Elfriede, Alice, Bob]"
+# 
+# @param source The source code of your lambda function.
+# @param params A list of parameter names your function takes.
+# @param fn_name The name of the resulting function, defaults to "eval".
+# @returns An object containing the lambda function as fn_name.
+static func lambda(source : String, params := [], fn_name := "eval") -> Reference:
+	var script := GDScript.new();
+	script.source_code = "tool\nextends Reference\nfunc {fn_name}({param_list}):\n\t{source}".format({
+		"source": source,
+		"param_list": PoolStringArray(params).join(","),
+		"fn_name": fn_name
+	})
+	var err : int = script.reload()
+	if err == OK:
+		return script.new()
+	else:
+		printerr("lambda: script compilation failed.")
+		return null
+
+# Removes elements from a collection only if the specified condition is met.
+# Takes either an object and a function name or a lambda and a parameter list
+# as parameters.
+#
+# Example 1:
+# func is_negative(num):
+#     return num < 0
+#
+# func remove_negatives(col):
+#     GDBAlgorithm.remove_if(col, self, "is_negative")
+#
+# Example 2:
+# func remove_negatives2(col):
+#     GDBAlgorithm.remove_if(col, "num < 0", ["num"])
+static func remove_if(collection, p0, p1 = null) -> int:
+	if p0 is String:
+		if p1 && !p1 is Array:
+			printerr("remove_if failed: invalid parameters")
+			return 0
+		var lmb := lambda(p0 as String, p1 as Array if p1 else [])
+		if !lmb:
+			return 0 # errors have already been printed
+		return __remove_if(collection, lmb, "eval")
+	elif !p0 is Object || !p1 is String:
+		printerr("remove_if failed: invalid parameters")
+		return 0
+	else:
+		return __remove_if(collection, p0, p1)
+
+static func sort_by(arr : Array, prop_name : String, descending := false):
+	var comparator := __SortBy.new()
+	comparator.prop_name = prop_name
+	comparator.descending = descending
+	arr.sort_custom(comparator, "__sort")
+
+#################
+# private stuff #
+#################
+static func __remove_if(collection, object : Object, predicate : String) -> int:
+	if collection is Array:
+		return __remove_if_array(collection, object, predicate)
+	elif collection is Dictionary:
+		return __remove_if_dict(collection, object, predicate)
+	else:
+		var values_to_remove := []
+		for ele in collection:
+			if object.call(predicate, ele):
+				values_to_remove.append(ele)
+		for ele in values_to_remove:
+			collection.erase(ele)
+		return values_to_remove.size()
+
+static func __remove_if_array(array : Array, object : Object, predicate : String) -> int:
+	var removed := 0
+	for i in range(array.size() - 1, -1, -1):
+		if object.call(predicate, array[i]):
+			array.remove(i)
+			removed += 1
+	return removed
+
+static func __remove_if_dict(dict : Dictionary, object : Object, predicate : String) -> int:
+	var removed := 0
+	for key in dict.keys():
+		if object.call(predicate, dict[key]):
+			dict.erase(key)
+			removed += 1
+	return removed
diff --git a/scripts/libs/constants.gd b/scripts/libs/constants.gd
new file mode 100644
index 0000000..0412406
--- /dev/null
+++ b/scripts/libs/constants.gd
@@ -0,0 +1,15 @@
+###
+### global constants
+###
+extends Object
+
+class_name GDBConstants
+
+const SETTING_RECENT_PLACES = "recent_places"
+const SETTING_FAVOURITE_PLACES = "favourite_places"
+
+################
+# public stuff #
+################
+func _init() -> void:
+	assert(0, "This class should not be instantiated.")
diff --git a/scripts/libs/coroutine.gd b/scripts/libs/coroutine.gd
new file mode 100644
index 0000000..5edfd16
--- /dev/null
+++ b/scripts/libs/coroutine.gd
@@ -0,0 +1,148 @@
+###
+### utility for writing coroutines
+###
+extends Object
+
+class_name GDBCoroutine
+
+class __WaitAll:
+	var __SIG_SEPERATOR = Reference.new()
+	var remaining_signals : Array
+	var results := []
+	
+	func __connect_signals():
+		for i in range(remaining_signals.size()):
+			var ele = remaining_signals[i]
+			assert(ele is Dictionary && ele.has("object") && ele.has("signal"))
+			ele["object"].connect(ele["signal"], self, "_on_signal", [__SIG_SEPERATOR, ele["object"], ele["signal"], i])
+		results.resize(remaining_signals.size())
+	
+	func _on_signal(p0 = null, p1 = null, p2 = null, p3 = null, p4 = null, p5 = null, p6 = null, p7 = null):
+		var params := [p0, p1, p2, p3, p4, p5, p6, p7]
+		assert(__SIG_SEPERATOR in params)
+		
+		# store the parameters
+		var param = params.pop_front()
+		var sig_params = []
+		while param != __SIG_SEPERATOR:
+			sig_params.append(param)
+			param = params.pop_front()
+		
+		# object, signal and index should be remaining (and some nulls)
+		assert(params.size() >= 3)
+		for i in range(remaining_signals.size()):
+			if remaining_signals[i]["object"] == params[0] && remaining_signals[i]["signal"] == params[1]:
+				remaining_signals.remove(i)
+				results[params[2]] = sig_params
+				break
+		
+		if remaining_signals.empty():
+			emit_signal("finished", results)
+	
+	signal finished(results)
+
+class __WaitAny:
+	var __SIG_SEPERATOR = Reference.new()
+	
+	func __connect_signals(signals : Array):
+		for ele in signals:
+			assert(ele is Dictionary && ele.has("object") && ele.has("signal"))
+			ele["object"].connect(ele["signal"], self, "_on_signal", [__SIG_SEPERATOR, ele["object"], ele["signal"]])
+	
+	func _on_signal(p0 = null, p1 = null, p2 = null, p3 = null, p4 = null, p5 = null, p6 = null):
+		var params := [p0, p1, p2, p3, p4, p5, p6]
+		assert(__SIG_SEPERATOR in params)
+		
+		# store the parameters
+		var param = params.pop_front()
+		var sig_params := []
+		while param != __SIG_SEPERATOR:
+			sig_params.append(param)
+			param = params.pop_front()
+		
+		# object and signal should be remaining (and some nulls)
+		assert(params.size() >= 2)
+		emit_signal("finished", params[0], params[1], sig_params)
+		
+		for con in get_signal_connection_list("_on_signal"):
+			con["source"].disconnect(con["signal"], self, "_on_signal")
+	
+	signal finished(obj, sig, result)
+
+################
+# public stuff #
+################
+func _init() -> void:
+	assert(0, "This class should not be instantiated.")
+
+#! Wait for multiple signals.
+#!
+#! Utility function to wait for multiple signals to occur, in any order.
+#! The returned object will emit a "finished" signal after all signals
+#! fired.
+#!
+#! The parameters provided to the signal handlers are stored inside a
+#! "results" field inside the returned object and also provided to the
+#! finish signal. Their order corresponds to the order of the objects
+#! and signals provided in the parameters.
+#!
+#! If no signals have been provided, it will fire on the next frame. (This could
+#! easily be increased by editing the source of this function, if required.)
+#!
+#! For technical reasons the signals must provide at most four parameters.
+#!
+#! Example (waits until all three buttons have been pressed):
+#! yield(coroutine.wait_for_all([
+#!     {"object": $button0, "signal": "pressed"},
+#!     {"object": $button1, "signal": "pressed"},
+#!     {"object": $button2, "signal": "pressed"}
+#! ]), "finished")
+#!
+#! \param objects_and_signals An array of dictionaries, each containing
+#!                            "object" and "signal" elements.
+#! \returns An object with a "finished" signal.
+static func wait_for_all(objects_and_signals : Array) -> Object:
+	var obj := __WaitAll.new()
+	if objects_and_signals:
+		obj.remaining_signals = objects_and_signals
+	else:
+		obj.remaining_signals = [{"object": GDBUtility.get_scene_tree(), "signal": "idle_frame"}]
+	obj.__connect_signals()
+	return obj
+
+#! Wait for multiple signals.
+#!
+#! Utility function to wait for one of multiple signals to occur.
+#! The returned object will emit a "finished" signal after any of the
+#! provided signals occured. It will only be emitted a single time.
+#!
+#! If no signals have been provided, the signal will never fire.
+#!
+#! The provided signal takes three parameters: 1. the object that
+#! emitted the initial signal, 2. the signal that had been emitted
+#! and 3. the parameters provided to the signal handler, as an array.
+#!
+#! For technical reasons the signals must provide at most four parameters.
+#!
+#! Example (waits until any of the buttons has been pressed):
+#! var res = yield(coroutine.wait_for_any([
+#!     {"object": $button0, "signal": "pressed"},
+#!     {"object": $button1, "signal": "pressed"},
+#!     {"object": $button2, "signal": "pressed"}
+#! ]), "finished")
+#! var button = res[0]
+#! button.disabled = true
+#!
+#! \param objects_and_signals An array of dictionaries, each containing
+#!                            "object" and "signal" elements.
+#! \returns An object with a "finished" signal.
+static func wait_for_any(objects_and_signals : Array):
+	var obj := __WaitAny.new()
+	obj.__connect_signals(objects_and_signals)
+	return obj
+
+static func await(res):
+	if res is GDScriptFunctionState:
+		return yield(res, "completed")
+	yield(GDBUtility.get_scene_tree(), "idle_frame")
+	return res
diff --git a/scripts/libs/debug.gd b/scripts/libs/debug.gd
new file mode 100644
index 0000000..c65eafb
--- /dev/null
+++ b/scripts/libs/debug.gd
@@ -0,0 +1,29 @@
+###
+### debugging tools
+### mostly validity checks
+###
+extends Object
+
+class_name GDBDebug
+
+################
+# public stuff #
+################
+func _init() -> void:
+	assert(0, "This class should not be instantiated.")
+
+static func assert_valid_num(v):
+	assert(!is_nan(v) && !is_inf(v))
+
+static func assert_valid_vec2(v : Vector2):
+	assert(!is_nan(v.x) && !is_inf(v.x))
+	assert(!is_nan(v.y) && !is_inf(v.y))
+
+static func assert_valid_vec3(v : Vector3):
+	assert(!is_nan(v.x) && !is_inf(v.x))
+	assert(!is_nan(v.y) && !is_inf(v.y))
+	assert(!is_nan(v.z) && !is_inf(v.z))
+
+static func deprecated(note : String) -> void:
+	printerr("Usage of deprecated function: " + note)
+	print_stack()
diff --git a/scripts/libs/format.gd b/scripts/libs/format.gd
new file mode 100644
index 0000000..e7bd6bc
--- /dev/null
+++ b/scripts/libs/format.gd
@@ -0,0 +1,80 @@
+###
+### various formatting functions
+###
+extends Object
+
+class_name GDBFormat
+
+################
+# public stuff #
+################
+func _init() -> void:
+	assert(0, "This class should not be instantiated.")
+
+static func format_bytes(bytes : int) -> String:
+	var UNITS = ["B", "KiB", "MiB", "GiB", "TiB"]
+	var idx = 0
+	while bytes > 1024 && idx < UNITS.size() - 1:
+		bytes = bytes / 1024.0
+		idx += 1
+	return "%.4f %s" % [bytes, UNITS[idx]]
+
+static func format_time(time : float) -> String:
+# warning-ignore:integer_division
+	var minutes = int(time) / 60
+	var seconds = int(time) % 60
+	return "%02d:%02d" % [minutes, seconds]
+
+static func format_unixtime(unix_time : int, format := tr("{0year}-{0month}-{0day} {0hour}:{0minute}")) -> String:
+	var datetime = OS.get_datetime_from_unix_time(unix_time)
+	datetime["year2"] = datetime["year"] % 100
+	datetime["0year"] = "%02d" % datetime["year2"]
+	datetime["0month"] = "%02d" % datetime["month"]
+	datetime["0day"] = "%02d" % datetime["day"]
+	datetime["0hour"] = "%02d" % datetime["hour"]
+	datetime["0minute"] = "%02d" % datetime["minute"]
+	datetime["0second"] = "%02d" % datetime["second"]
+	
+	# return "%02d-%02d-%02d %02d:%02d" % [datetime["year"] % 100, datetime["month"], datetime["day"], datetime["hour"], datetime["minute"]]
+	return format.format(datetime)
+
+static func smart_format_unixtime(unix_time : int, format_date := tr("{0year}-{0month}-{0day}"), format_time := tr("{0hour}:{0minute}")) -> String:
+	var now = OS.get_unix_time()
+	var datetime = OS.get_datetime_from_unix_time(unix_time)
+	
+	__datetime_add_fields(datetime)
+	
+	if now == unix_time:
+		return GDBUtility.translate("just now")
+	elif now > unix_time:
+		var tdiff = now - unix_time
+		if tdiff < 60: # < 60 seconds
+			return GDBUtility.translate("%d seconds ago") % tdiff
+		elif tdiff < 3600: # < 60 minutes
+			return GDBUtility.translate("%d minutes ago") % (tdiff / 60)
+		var now_datetime = OS.get_datetime_from_unix_time(now)
+		if now_datetime["year"] == datetime["year"] && now_datetime["month"] == datetime["month"] && now_datetime["day"] == datetime["day"]:
+			return GDBUtility.translate("today at %s") % format_time.format(datetime)
+	else:
+		var tdiff = unix_time - now
+		if tdiff < 60:
+			return GDBUtility.translate("in %d seconds") % tdiff
+		elif tdiff < 3600:
+			return GDBUtility.translate("in %d minutes") % (tdiff / 60)
+		var now_datetime = OS.get_datetime_from_unix_time(now)
+		if now_datetime["year"] == datetime["year"] && now_datetime["month"] == datetime["month"] && now_datetime["day"] == datetime["day"]:
+			return GDBUtility.translate("today at %s") % format_time.format(datetime)
+	
+	return "%s %s" % [format_date.format(datetime), format_time.format(datetime)]
+
+#################
+# private stuff #
+#################
+static func __datetime_add_fields(datetime : Dictionary) -> void:
+	datetime["year2"] = datetime["year"] % 100
+	datetime["0year"] = "%02d" % datetime["year2"]
+	datetime["0month"] = "%02d" % datetime["month"]
+	datetime["0day"] = "%02d" % datetime["day"]
+	datetime["0hour"] = "%02d" % datetime["hour"]
+	datetime["0minute"] = "%02d" % datetime["minute"]
+	datetime["0second"] = "%02d" % datetime["second"]
diff --git a/scripts/libs/fsutil.gd b/scripts/libs/fsutil.gd
new file mode 100644
index 0000000..b0afbbf
--- /dev/null
+++ b/scripts/libs/fsutil.gd
@@ -0,0 +1,100 @@
+###
+### file system utility
+###
+extends Object
+
+class_name GDBFsUtil
+
+const __META_FILENAME_REGEX = "__gdb_fsutil_filename_regex__"
+
+################
+# public stuff #
+################
+func _init() -> void:
+	assert(0, "This class should not be instantiated.")
+
+static func find_all_by_name(path : String, name : String, files_only = true) -> Dictionary:
+	var result = []
+	__find_all_by_name(path, name, result, files_only)
+	return result
+
+static func escape_filename(filename : String) -> String:
+	return __get_filename_regex().sub(filename, "_", true)
+
+static func is_filename_valid(filename : String) -> bool:
+	return __get_filename_regex().search(filename) == null
+
+static func load_image_resource(filename : String):
+	var res = load(filename)
+	if res:
+		return res
+	var img = Image.new()
+	if img.load(filename) == OK:
+		var tex = ImageTexture.new()
+		tex.create_from_image(img)
+		return tex
+	return null
+
+#! Retrieve information about the current git branch.
+#!
+#! Used to display this information in development builds.
+#! Returns a dictionary with the following keys:
+#!   - "branch" - the name of the current branch
+#!   - "commit" - the full hash of the latest commit
+#!   - "commit_short" - the shortened hash of the last commit
+static func get_git_info() -> Dictionary:
+	var file = File.new()
+	if file.open("res://.git/HEAD", File.READ) != OK:
+		return {"branch": "<unknown>", "commit": "???", "commit_short": "???"}
+	var text = file.get_line()
+	if !text.begins_with("ref:"):
+		return {"branch": "<detached>", "commit": text, "commit_short": text.left(7)}
+	var ref = text.right(5).get_file()
+	file.close()
+	if file.open("res://.git/refs/heads/%s" % ref, File.READ) != OK:
+		return {"branch": ref, "commit": "<unknown>", "commit_short": "<unknown>"}
+	var commitid = file.get_line()
+	return {"branch": ref, "commit": commitid, "commit_short": commitid.left(7)}
+
+
+static func get_home_folder() -> String:
+	if OS.has_feature("X11"):
+		if OS.has_environment("HOME"):
+			return OS.get_environment("HOME")
+	elif OS.has_feature("Windows"):
+		if OS.has_environment("USERPROFILE"):
+			return OS.get_environment("USERPROFILE")
+	
+	return "/"
+
+#################
+# private stuff #
+#################
+static func __get_filename_regex() -> RegEx:
+	var tree := GDBUtility.get_scene_tree()
+	if tree.has_meta(__META_FILENAME_REGEX):
+		return tree.get_meta(__META_FILENAME_REGEX) as RegEx
+	var filename_regex := RegEx.new()
+	filename_regex.compile("[^a-zA-Z0-9_\\-\\. ]")
+	tree.set_meta(__META_FILENAME_REGEX, filename_regex)
+	return filename_regex
+
+static func __find_all_by_name(path, name, result, files_only):
+	var dir = Directory.new()
+	if dir.open(path) != OK:
+#		print("cannot open dir %s" % path)
+		return
+	dir.list_dir_begin(true)
+	while true:
+		var fname = dir.get_next()
+		if fname == "":
+			break
+		var full_name = path + "/" + fname
+		if fname == name && (!files_only || dir.file_exists(full_name)):
+			result.append(full_name)
+			
+		# dir_exists doesnt work for res:// paths, just attempt to add, will silently fail for files
+		if true: # dir.dir_exists(full_name):
+			__find_all_by_name(full_name, name, result, files_only)
+	
+	dir.list_dir_end()
diff --git a/scripts/libs/geoutil.gd b/scripts/libs/geoutil.gd
new file mode 100644
index 0000000..30cf6af
--- /dev/null
+++ b/scripts/libs/geoutil.gd
@@ -0,0 +1,173 @@
+###
+### geometry utility code
+### some of this might not work yet, please dont use it
+###
+extends Object
+
+class_name GDBGeoUtility
+
+class Grid3D:
+	var size : Vector3
+	var data : Array
+	
+	func _init(size_ : Vector3, init_val = null):
+		size = size_
+		data = []
+		data.resize(size.x * size.y * size.z)
+		for i in range(data.size()):
+			data[i] = init_val
+	
+	func _idx(x, y, z):
+		return x + y * size.x + z * size.x * size.y
+	
+	func get_at(x, y, z):
+		return data[_idx(x, y, z)]
+	
+	func set_at(x, y, z, val):
+		data[_idx(x, y, z)] = val
+
+################
+# public stuff #
+################
+func _init() -> void:
+	assert(0, "This class should not be instantiated.")
+
+static func full_aabb(root : Spatial):
+	var aabb = AABB()
+	for vi in GDBUtility.find_nodes_by_type(root, VisualInstance):
+		var local_aabb = vi.get_aabb()
+		local_aabb = vi.global_transform.xform(local_aabb)
+		aabb = aabb.merge(local_aabb)
+	return aabb
+
+static func gen_aabb(points : Array, point_transform = Transform()) -> AABB:
+	var aabb = AABB()
+	for point in points:
+		aabb = aabb.expand(point_transform.xform(point))
+	return aabb
+
+static func collsion_aabb(collision_object : CollisionObject) -> AABB:
+	var aabb := AABB()
+	for owner_id in collision_object.get_shape_owners():
+		var trans = collision_object.shape_owner_get_transform(owner_id)
+		for shape_id in range(collision_object.shape_owner_get_shape_count(owner_id)):
+			var shape = collision_object.shape_owner_get_shape(owner_id, shape_id)
+			var new_aabb = shape_aabb(shape)
+			if new_aabb.size:
+				aabb = aabb.merge(trans.xform(new_aabb))
+	return aabb
+
+static func shape_aabb(shape : Shape) -> AABB:
+	if shape is BoxShape:
+		return AABB(-shape.extents, 2.0 * shape.extents)
+	elif shape is CapsuleShape:
+		return AABB(Vector3(-shape.radius, -shape.radius - 0.5 * shape.height, -shape.radius), \
+				Vector3(2.0 * shape.radius, 2.0 * shape.radius + shape.height, 2.0 * shape.radius))
+	elif shape is CylinderShape:
+		return AABB(Vector3(-shape.radius, -0.5 * shape.height, -shape.radius), \
+				Vector3(2.0 * shape.radius, shape.height, 2.0 * shape.radius))
+	elif shape is PlaneShape:
+		return AABB()
+	elif shape is SphereShape:
+		return AABB(-Vector3(shape.radius, shape.radius, shape.radius), 2.0 * Vector3(shape.radius, shape.radius, shape.radius))
+	else:
+		# TODO: polygon shapes
+		return AABB()
+
+static func orphan_global_transform(node : Node):
+	var transform : Transform
+	if node is Spatial:
+		transform = node.transform
+	var parent = node.get_parent()
+	if parent != null:
+		transform = orphan_global_transform(parent) * transform
+	return transform
+
+static func voxelize_surf(mesh : ArrayMesh, surf : int, particle_size = -1.0) -> PoolVector3Array:
+	var arrays = mesh.surface_get_arrays(surf)
+	var points = arrays[Mesh.ARRAY_VERTEX]
+	return PoolVector3Array(points)
+
+static func voxelize(mesh : ArrayMesh, particle_size = -1.0) -> PoolVector3Array:
+	var points = PoolVector3Array()
+	for surf in range(mesh.get_surface_count()):
+		points.append_array(voxelize_surf(mesh, surf, particle_size))
+	return points
+
+static func transform_to(node : Node, root : Node):
+	var transform = Transform()
+	var node_ = node
+	while node_ != root && node_ != null:
+		if node_ is Spatial:
+			transform = transform * node_.transform
+		node_ = node_.get_parent()
+	return transform
+
+static func mesh_to_grid(mesh : ArrayMesh, grid_size : float, point_transform = Transform()):
+	var aabb = AABB()
+	for i in range(mesh.get_surface_count()):
+		var points = mesh.surface_get_arrays(i)[Mesh.ARRAY_VERTEX]
+		aabb = aabb.merge(gen_aabb(points, point_transform))
+	var grid_x = ceil(aabb.size.x / grid_size)
+	var grid_y = ceil(aabb.size.y / grid_size)
+	var grid_z = ceil(aabb.size.z / grid_size)
+	var grid = Grid3D.new(Vector3(grid_x, grid_y, grid_z), 0)
+	var grid_origin = aabb.position
+	
+	for i in range(mesh.get_surface_count()):
+		__insert_surf(mesh, i, grid_origin, grid_size, grid, point_transform)
+	
+	var result = []
+	for x in range(grid.size.x):
+		for y in range(grid.size.y):
+			var inside = false
+			for z in range(grid.size.z):
+				var cell_value = grid.get_at(x, y, z) % 2
+				if cell_value == 1:
+					inside = !inside
+				if inside || cell_value > 0:
+					result.append(Vector3(x, y, z))
+	return result
+
+# http://www.boris-belousov.net/2016/12/01/quat-dist/
+static func basis_angle(basis0 : Basis, basis1 : Basis):
+	var basis_diff = basis0 * basis1.transposed()
+	var tr : float = basis_diff.x.x + basis_diff.y.y + basis_diff.z.z
+	return acos((tr - 1) / 2)
+
+static func angle_normalize(angle : float) -> float:
+	while angle < -PI:
+		angle += 2.0 * PI
+	while angle > PI:
+		angle -= 2.0 * PI
+	return angle
+
+static func angle_diff(angle0 : float, angle1 : float) -> float:
+	return angle_normalize(angle0 - angle1)
+
+#################
+# private stuff #
+#################
+static func __insert_tri(a : Vector3, b : Vector3, c : Vector3, grid_origin : Vector3, grid_size : float, grid : Grid3D, point_transform : Transform):
+	var ray_dir = Vector3(0, 0, 1)
+	for x in range(grid.size.x):
+		for y in range(grid.size.y):
+			var ray_origin = grid_origin + grid_size * Vector3(x, y, 0)
+			var inters = Geometry.ray_intersects_triangle(ray_origin, ray_dir, point_transform.xform(a), point_transform.xform(b), point_transform.xform(c))
+			if inters != null:
+				var z = floor(0.99 * (inters.z - grid_origin.z) / grid_size)
+				grid.set_at(x, y, z, grid.get_at(x, y, z) + 1)
+
+static func __insert_surf(mesh : ArrayMesh, surf : int, grid_origin : Vector3, grid_size : float, grid : Grid3D, point_transform : Transform):
+	var arrays = mesh.surface_get_arrays(surf)
+	if arrays.size() >= Mesh.ARRAY_INDEX - 1 && arrays[Mesh.ARRAY_INDEX].size() > 0:
+		# index mode
+		var indices = arrays[Mesh.ARRAY_INDEX]
+		var vertices = arrays[Mesh.ARRAY_VERTEX]
+		for i in range(0, indices.size() - 2, 3):
+			__insert_tri(vertices[indices[i]], vertices[indices[i + 1]], vertices[indices[i + 2]], grid_origin, grid_size, grid, point_transform)
+	else:
+		# normal mode
+		var vertices = arrays[Mesh.ARRAY_VERTEX]
+		for i in range(0, vertices.size() - 2, 3):
+			__insert_tri(vertices[i], vertices[i + 1], vertices[i + 2], grid_origin, grid_size, grid, point_transform)
diff --git a/scripts/libs/graphing.gd b/scripts/libs/graphing.gd
new file mode 100644
index 0000000..c4edf7b
--- /dev/null
+++ b/scripts/libs/graphing.gd
@@ -0,0 +1,306 @@
+###
+### graph class + algorithms
+###
+extends Object
+
+class Edge:
+	var idx0 : int
+	var idx1 : int
+	var weight : float
+	
+	func _init(idx0_ : int, idx1_ : int, weight_ : float):
+		idx0 = idx0_
+		idx1 = idx1_
+		weight = weight_
+
+class Graph:
+	var vertices = []
+	var edges = []
+	
+	func append_vertex(vertex):
+		var idx = vertices.size()
+		vertices.append(vertex)
+		return idx
+	
+	func append_vertices(vertices_ : Array):
+		for vertex in vertices_:
+			vertices.append(vertex)
+	
+	func append_edge(idx0, idx1, weight := 1.0):
+		for edge in edges:
+			if (edge.idx0 == idx0 && edge.idx1 == idx1) || \
+			   (edge.idx0 == idx1 && edge.idx1 == idx0):
+				return
+		edges.append(Edge.new(idx0, idx1, weight))
+	
+	func remove_vertex(vertex):
+		var idx = vertices.find(vertex)
+		if idx > -1:
+			remove_vertex_at(idx)
+	
+	func remove_vertex_at(idx):
+		vertices.remove(idx)
+		# fix edges
+		var to_remove = []
+		for edge in edges:
+			if edge.idx0 == idx || edge.idx1 == idx:
+				to_remove.append(edge)
+			else:
+				if edge.idx0 > idx:
+					edge.idx0 -= 1
+				if edge.idx1 > idx:
+					edge.idx1 -= 1
+		for edge in to_remove:
+			edges.erase(edge)
+	
+	func remove_edge(idx0, idx1):
+		var to_remove = []
+		for edge in edges:
+			if (edge.idx0 == idx0 && edge.idx1 == idx1) || \
+			   (edge.idx0 == idx1 && edge.idx1 == idx0):
+				to_remove.append(edge)
+		for edge in to_remove:
+			edges.erase(edge)
+	
+	func duplicate(deep = false):
+		var dupl = Graph.new()
+		dupl.vertices = vertices.duplicate(deep)
+		for edge in edges:
+			dupl.append_edge(edge.idx0, edge.idx1, edge.weight)
+		return dupl
+
+################
+# public stuff #
+################
+func _init() -> void:
+	assert(0, "This class should not be instantiated.")
+
+# generates a delaunay triangulation for the given point list
+func gen_delaunay(point_list : Array) -> Graph:
+	assert(point_list.size() > 2)
+	var graph = Graph.new()
+	var tris = []
+	
+	graph.append_vertices(point_list)
+	__gen_super_triangle(graph, point_list)
+	tris.append(Vector3(graph.vertices.size() - 3, graph.vertices.size() - 2, graph.vertices.size() - 1))
+	
+	for idx in range(point_list.size()):
+		var point = point_list[idx]
+		var bad_triangles = []
+		for tri in tris:
+			var p0 = graph.vertices[tri.x]
+			var p1 = graph.vertices[tri.y]
+			var p2 = graph.vertices[tri.z]
+			
+			if __point_in_circumcircle(point, p0, p1, p2):
+				bad_triangles.append(tri)
+		var polygon := []
+		for bad_tri in bad_triangles:
+			if !__edge_shared(bad_tri.x, bad_tri.y, bad_triangles):
+				polygon.append(Vector2(bad_tri.x, bad_tri.y))
+			if !__edge_shared(bad_tri.y, bad_tri.z, bad_triangles):
+				polygon.append(Vector2(bad_tri.y, bad_tri.z))
+			if !__edge_shared(bad_tri.z, bad_tri.x, bad_triangles):
+				polygon.append(Vector2(bad_tri.z, bad_tri.x))
+		for bad_tri in bad_triangles:
+			tris.erase(bad_tri)
+			graph.remove_edge(bad_tri.x, bad_tri.y)
+			graph.remove_edge(bad_tri.y, bad_tri.z)
+			graph.remove_edge(bad_tri.z, bad_tri.x)
+		
+		for edge in polygon:
+			var tri = Vector3(edge.x, edge.y, idx)
+			var p0 = graph.vertices[tri.x]
+			var p1 = graph.vertices[tri.y]
+			var p2 = graph.vertices[tri.z]
+			
+			tris.append(tri)
+			graph.append_edge(tri.x, tri.y, p0.distance_to(p1))
+			graph.append_edge(tri.y, tri.z, p1.distance_to(p2))
+			graph.append_edge(tri.z, tri.x, p2.distance_to(p0))
+	
+	# remove super triangle
+	for idx in range(graph.vertices.size() - 1, graph.vertices.size() - 4, -1):
+		graph.remove_vertex_at(idx)
+	
+	return graph
+
+# generate the minimum spanning tree
+func gen_mst(graph : Graph) -> Graph:
+	var mst = graph.duplicate()
+	var possible_edges = mst.edges
+	var forests = []
+	mst.edges = []
+	
+	possible_edges.sort_custom(self, "__edge_weight_comp")
+	for idx in range(mst.vertices.size()):
+		forests.append([idx])
+	
+	while !possible_edges.empty():
+		var edge = possible_edges.pop_front()
+		# already connected?
+		if forests[edge.idx0] == forests[edge.idx1]:
+			continue
+		# append edge
+		mst.append_edge(edge.idx0, edge.idx1, edge.weight)
+		# merge forests
+		for idx in forests[edge.idx1]:
+			forests[edge.idx0].append(idx)
+			forests[idx] = forests[edge.idx0]
+	
+	return mst
+
+# finds the shortest path through the given graph
+# returns a dictionary with a "distance" and a "path"
+func find_path(graph : Graph, start_idx : int, end_idx : int) -> Dictionary:
+	var dist := []
+	var prev := []
+	var queue := []
+	for idx in range(graph.vertices.size()):
+		dist.append(INF)
+		prev.append(-1)
+		queue.append(idx)
+	dist[start_idx] = 0.0
+	
+	while !queue.empty():
+		var shortest_dist = INF
+		var shortest_idx : int
+		for idx in queue:
+			if dist[idx] < shortest_dist:
+				shortest_dist = dist[idx]
+				shortest_idx = idx
+		if shortest_idx == end_idx: # found it
+			if shortest_dist == INF:
+				return {
+					"distance": INF,
+					"path": []
+				}
+			var path = [end_idx]
+			var idx = end_idx
+			while prev[idx] != -1:
+				path.append(prev[idx])
+				idx = prev[idx]
+			assert(idx == start_idx)
+			return {
+				"distance": dist[end_idx],
+				"path": path
+			}
+		queue.erase(shortest_idx)
+		for edge in graph.edges:
+			var target_idx
+			if edge.idx0 == shortest_idx:
+				target_idx = edge.idx1
+			elif edge.idx1 == shortest_idx:
+				target_idx = edge.idx0
+			else:
+				continue
+			var new_dist = shortest_dist + edge.weight
+			if new_dist < dist[target_idx]:
+				dist[target_idx] = new_dist
+				prev[target_idx] = shortest_idx
+	return {
+		"distance": INF,
+		"path": []
+	}
+
+# draws a graph onto a control
+func dump_graph_2d(graph : Graph, control : Control) -> void:
+	var normalized_graph = graph.duplicate()
+	var min_xy = Vector2.INF
+	var max_xy = -Vector2.INF
+	
+	# normalize graph
+	for vertex in normalized_graph.vertices:
+		if vertex.x < min_xy.x:
+			min_xy.x = vertex.x
+		if vertex.x > max_xy.x:
+			max_xy.x = vertex.x
+		if vertex.y < min_xy.y:
+			min_xy.y = vertex.y
+		if vertex.y > max_xy.y:
+			max_xy.y = vertex.y
+	
+	for idx in range(normalized_graph.vertices.size()):
+		var normalized_vertex = normalized_graph.vertices[idx]
+		normalized_vertex.x = inverse_lerp(min_xy.x, max_xy.x, normalized_vertex.x)
+		normalized_vertex.y = inverse_lerp(min_xy.y, max_xy.y, normalized_vertex.y)
+		normalized_graph.vertices[idx] = normalized_vertex
+	
+	var img_size = control.rect_size
+	
+	for edge in normalized_graph.edges:
+		var v0 = normalized_graph.vertices[edge.idx0]
+		var v1 = normalized_graph.vertices[edge.idx1]
+		var coord0 = __img_vertex_coord(v0, img_size)
+		var coord1 = __img_vertex_coord(v1, img_size)
+		
+		control.draw_line(coord0, coord1, Color.yellow, 2.0, true)
+	
+	for vertex in normalized_graph.vertices:
+		var coord = __img_vertex_coord(vertex, img_size)
+		control.draw_circle(coord, 5.0, Color.red)
+
+#################
+# private stuff #
+#################
+func __gen_super_triangle(graph : Graph, point_list : Array) -> void:
+	var min_xy = Vector2.INF
+	var max_xy = -Vector2.INF
+	
+	for point in point_list:
+		if point.x < min_xy.x:
+			min_xy.x = point.x
+		if point.y < min_xy.y:
+			min_xy.y = point.y
+		if point.x > max_xy.x:
+			max_xy.x = point.x
+		if point.y > max_xy.y:
+			max_xy.y = point.y
+	
+	min_xy -= Vector2(1.0, 1.0)
+	
+	var p1 = Vector2(2.0 * max_xy.x, min_xy.y)
+	var p2 = Vector2(min_xy.x, 2.0 * max_xy.y)
+	
+	var idx0 = graph.append_vertex(min_xy)
+	var idx1 = graph.append_vertex(p1)
+	var idx2 = graph.append_vertex(p2)
+	graph.append_edge(idx0, idx1, min_xy.distance_to(p1))
+	graph.append_edge(idx1, idx2, p1.distance_to(p2))
+	graph.append_edge(idx2, idx0, p2.distance_to(min_xy))
+
+func __edge_shared(p0 : int, p1 : int, tris : Array) -> bool:
+	var edge_count = 0
+	for tri in tris:
+		if (p0 == tri.x || p0 == tri.y || p0 == tri.z) && \
+		   (p1 == tri.x || p1 == tri.y || p1 == tri.z):
+			edge_count += 1
+	return edge_count > 1
+
+func __point_in_circumcircle(point : Vector2, p0 : Vector2, p1 : Vector2, p2 : Vector2) -> bool:
+	var p0x_ = p0.x - point.x
+	var p0y_ = p0.y - point.y
+	var p1x_ = p1.x - point.x
+	var p1y_ = p1.y - point.y
+	var p2x_ = p2.x - point.x
+	var p2y_ = p2.y - point.y
+	return (
+		(p0x_*p0x_ + p0y_*p0y_) * (p1x_*p2y_-p2x_*p1y_) - \
+		(p1x_*p1x_ + p1y_*p1y_) * (p0x_*p2y_-p2x_*p0y_) + \
+		(p2x_*p2x_ + p2y_*p2y_) * (p0x_*p1y_-p1x_*p0y_) \
+	) > 0;
+
+func __check_poly(polygon) -> void:
+	for edge0 in polygon:
+		for edge1 in polygon:
+			if edge0 == edge1:
+				continue
+			assert(edge0.x != edge1.x || edge0.y != edge1.y)
+			assert(edge0.x != edge1.y || edge0.y != edge1.x)
+
+func __edge_weight_comp(e0 : Edge, e1 : Edge):
+	return e0.weight < e1.weight
+
+func __img_vertex_coord(vertex : Vector2, img_size : Vector2):
+	return Vector2(5.0, 5.0) + vertex * (img_size - Vector2(10.0, 10.0))
diff --git a/scripts/libs/math.gd b/scripts/libs/math.gd
new file mode 100644
index 0000000..d1d2504
--- /dev/null
+++ b/scripts/libs/math.gd
@@ -0,0 +1,74 @@
+###
+### math utility
+###
+extends Object
+
+class_name GDBMath
+
+################
+# public stuff #
+################
+func _init() -> void:
+	assert(0, "This class should not be instantiated.")
+
+static func angle(vec0 : Vector3, vec1 : Vector3, axis : Vector3) -> float:
+	var res = vec0.angle_to(vec1)
+	var crs = axis.cross(vec0)
+	var dir = vec1 - vec0
+	
+	if dir.dot(crs) < 0:
+		return -res
+	else:
+		return res
+
+static func find_perp(a : Vector3, b : Vector3, d : Vector3) -> Vector3:
+	var t0 = d.dot(a)
+	var t1 = d.dot(b)
+	
+	if t0 - t1 < 0.01:
+		return a
+	
+	var t = -t1 / (t0 - t1)
+	# assert(t >= 0 && t <= 1)
+	var n = b.linear_interpolate(a, t).normalized()
+	var an = n.angle_to(d)
+	assert(abs(n.dot(d)) < 0.01)
+	assert(abs(an - 0.5 * PI) < 0.01)
+	return n
+
+static func rects_intersect(pos0 : Vector2, size0 : Vector2, pos1 : Vector2, size1 : Vector2) -> bool:
+	if pos0.x + size0.x < pos1.x || pos1.x + size1.x < pos0.x:
+		return false
+	if pos0.y + size0.y < pos1.y || pos1.y + size1.y < pos1.y:
+		return false
+	return true
+
+static func min_element(array : Array) -> int:
+	var min_idx := -1
+	for idx in range(array.size()):
+		if min_idx == -1 || array[min_idx] > array[idx]:
+			min_idx = idx
+	return min_idx
+
+static func max_element(array : Array) -> int:
+	var min_idx := -1
+	for idx in range(array.size()):
+		if min_idx == -1 || array[min_idx] < array[idx]:
+			min_idx = idx
+	return min_idx
+
+static func to_int(any, default := 0) -> int:
+	if any is int:
+		return any
+	elif any is bool || any is float || any is String:
+		return int(any)
+	else:
+		return default
+
+static func to_float(any, default := 0.0) -> float:
+	if any is float:
+		return any
+	elif any is bool || any is int || any is String:
+		return float(any)
+	else:
+		return default
diff --git a/scripts/libs/settings.gd b/scripts/libs/settings.gd
new file mode 100644
index 0000000..ae0d1d7
--- /dev/null
+++ b/scripts/libs/settings.gd
@@ -0,0 +1,144 @@
+###
+### settings management API
+###
+extends Object
+
+class_name GDBSettings
+
+const __META_STATE = "__gdb_settings_state__"
+
+class __State:
+	# modification of the libraries behaviour
+	var settings_file_name := "user://settings.dat"
+	var disable_default_settings := false
+	var settings_changed := false
+	var values := {}
+	
+	signal setting_changed(name, value)
+
+################
+# public stuff #
+################
+func _init() -> void:
+	assert(0, "This class should not be instantiated.")
+
+static func has_value(name : String) -> bool:
+	return __get_state().values.has(name)
+
+static func get_value(name : String, def = null, type = TYPE_NIL):
+	if type == TYPE_NIL && def != null:
+		type = typeof(def)
+	
+	var val = __get_state().values.get(name, def)
+	if type is Object:
+		if !val is type:
+			return def
+	else:
+		match type:
+			TYPE_NIL:
+				return val
+			TYPE_STRING:
+				val = str(val)
+			TYPE_INT:
+				val = int(val)
+			TYPE_REAL:
+				val = float(val)
+			TYPE_BOOL:
+				val = bool(val)
+			_:
+				if typeof(val) != type:
+					return def
+	if val is Array || val is Dictionary:
+		val = val.duplicate()
+	return val
+
+static func set_value(name : String, value) -> void:
+	if __get_state().values.get(name) != value:
+		__set_value(name, value)
+		
+		# save next frame (in case multiple values are changed)
+		__get_state().settings_changed = true
+		yield(GDBUtility.get_scene_tree(), "idle_frame")
+		if __get_state().settings_changed:
+			store_to_file()
+			__get_state().settings_changed = false
+
+static func toggle_value(name : String) -> void:
+	set_value(name, !__get_state().values.get(name, false))
+
+static func array_add_value(name : String, value) -> void:
+	var arr = get_value(name, [])
+	arr.append(value)
+	set_value(name, arr)
+
+static func array_remove_value(name : String, value) -> void:
+	var arr = get_value(name, [])
+	arr.erase(value)
+	set_value(name, arr)
+
+static func array_has_value(name : String, value) -> bool:
+	var arr = get_value(name, [])
+	return arr.has(value)
+
+static func array_toggle_value(name : String, value) -> void:
+	var arr = get_value(name, [])
+	if arr.has(value):
+		arr.erase(value)
+	else:
+		arr.append(value)
+	set_value(name, arr)
+
+static func load_from_file() -> void:
+	var in_file = File.new()
+	
+	if not in_file.file_exists(__get_state().settings_file_name):
+		return # nothing to load
+	
+	in_file.open(__get_state().settings_file_name, File.READ)
+	__load_data(parse_json(in_file.get_as_text()))
+
+static func store_to_file() -> void:
+	var out_file = File.new()
+	out_file.open(__get_state().settings_file_name, File.WRITE)
+	out_file.store_line(__save_data())
+	out_file.close()
+
+static func set_disable_default_settings(disable : bool) -> void:
+	__get_state().disable_default_settings = disable
+
+static func is_disable_default_settings() -> bool:
+	return __get_state().disable_default_settings
+
+static func connect_static(sig_name : String, receiver : Object, method : String, binds := []) -> int:
+	return __get_state().connect(sig_name, receiver, method, binds)
+
+static func disconnect_static(sig_name : String, receiver : Object, method : String) -> void:
+	__get_state().disconnect(sig_name, receiver, method)
+
+#################
+# private stuff #
+#################
+static func __save_data():
+	return to_json(__get_state().values)
+
+static func __load_data(data : Dictionary):
+	for name in data:
+		__set_value(name, data[name])
+
+static func __set_value(name : String, value):
+	__get_state().values[name] = value
+	__on_setting_changed(name, value)
+	__get_state().emit_signal("setting_changed", name, value)
+
+static func __on_setting_changed(name : String, value):
+	if __get_state().disable_default_settings:
+		return
+	
+	match name:
+		"fullscreen":
+			OS.window_fullscreen = value
+		"vsync":
+			OS.vsync_enabled = value
+
+static func __get_state() -> __State:
+	return GDBUtility.get_state_object(__META_STATE, __State)
diff --git a/scripts/libs/util.gd b/scripts/libs/util.gd
new file mode 100644
index 0000000..247415e
--- /dev/null
+++ b/scripts/libs/util.gd
@@ -0,0 +1,385 @@
+###
+### a set of random utility functions
+###
+extends Object
+
+class_name GDBUtility
+
+################
+# public stuff #
+################
+func _init() -> void:
+	assert(0, "This class should not be instantiated.")
+
+static func find_node_filter(root : Node, object : Object, method : String, bfs := false) -> Node:
+	if object.call(method, root):
+		return root
+	
+	if bfs:
+		for child in root.get_children():
+			if object.call(method, child):
+				return child
+	
+	for child in root.get_children():
+		var res = find_node_filter(child, object, method)
+		if res != null:
+			return res
+	return null
+
+static func find_node_by_type(root : Node, tp, bfs := false) -> Node:
+	if root is tp:
+		return root
+	
+	if bfs:
+		for child in root.get_children():
+			if child is tp:
+				return child
+	
+	for child in root.get_children():
+		var res = find_node_by_type(child, tp, bfs)
+		if res != null:
+			return res
+	return null
+
+static func find_node_by_name(root : Node, name : String, bfs := false, use_cache := true) -> Node:
+	if root.name == name:
+		return root
+	
+	# create the cache regardless of use_cache
+	if !root.has_meta("__find_by_name_node_cache"):
+		root.set_meta("__find_by_name_node_cache", {})
+	
+	var cache = root.get_meta("__find_by_name_node_cache")
+	if use_cache && name in cache:
+		var node = root.get_node(cache[name])
+		if node:
+			return node
+		else:
+			cache.erase(name)
+	
+	if bfs:
+		for child in root.get_children():
+			if child.name == name:
+				cache[name] = child
+				return child
+	
+	for child in root.get_children():
+		var res = find_node_by_name(child, name)
+		if res != null:
+			cache[name] = root.get_path_to(res)
+			return res
+	return null
+
+static func find_nodes_by_type(root : Node, tp, as_path = false) -> Array:
+	var result = []
+	__find_nodes_by_type(root, tp, as_path, result)
+	return result
+
+static func find_nodes_with_member(root : Node, member : String) -> Array:
+	var result = []
+	__find_nodes_with_member(root, member, result)
+	return result
+
+static func find_parent_with_method(root : Node, method : String) -> Node:
+	if root.has_method(method):
+		return root
+	else:
+		var parent = root.get_parent()
+		if parent == null:
+			return null
+		return find_parent_with_method(parent, method)
+
+static func find_parent_with_member(root : Node, member : String) -> Node:
+	if root.get(member) != null:
+		return root
+	else:
+		var parent = root.get_parent()
+		if parent == null:
+			return null
+		return find_parent_with_member(parent, member)
+
+static func find_parent_with_name(root : Node, name : String) -> Node:
+	if root.name == name:
+		return root
+	else:
+		var parent = root.get_parent()
+		if parent == null:
+			return null
+		return find_parent_with_name(parent, name)
+
+static func find_parent_with_type(root : Node, tp) -> Node:
+	if (tp is Script && tp.instance_has(root)) \
+		|| root is tp:
+		return root
+	else:
+		var parent = root.get_parent()
+		if parent == null:
+			return null
+		return find_parent_with_type(parent, tp)
+
+static func find_treeitem_with_metadata(root : TreeItem, metadata, column := 0) -> TreeItem:
+	while root:
+		if root.get_metadata(column) == metadata:
+			return root
+		var in_children := find_treeitem_with_metadata(root.get_children(), metadata, column)
+		if in_children:
+			return in_children
+		root = root.get_next()
+	return null
+
+static func hide_properties(properties : Array, names_to_hide : Array) -> void:
+	for i in range(properties.size() - 1, -1, -1):
+		if properties[i]["name"] in names_to_hide:
+			properties.remove(i)
+
+static func type_name(type : int) -> String:
+	match type:
+		TYPE_NIL:
+			return "null"
+		TYPE_BOOL:
+			return "bool"
+		TYPE_INT:
+			return "int"
+		TYPE_REAL:
+			return "float"
+		TYPE_STRING:
+			return "String"
+		TYPE_VECTOR2:
+			return "Vector2"
+		TYPE_RECT2:
+			return "Rect2"
+		TYPE_VECTOR3:
+			return "Vector3"
+		TYPE_TRANSFORM2D:
+			return "Transform2D"
+		TYPE_PLANE:
+			return "Plane"
+		TYPE_QUAT:
+			return "Quat"
+		TYPE_AABB:
+			return "AABB"
+		TYPE_BASIS:
+			return "Basis"
+		TYPE_TRANSFORM:
+			return "Transform"
+		TYPE_COLOR:
+			return "Color"
+		TYPE_NODE_PATH:
+			return "NodePath"
+		TYPE_RID:
+			return "RID"
+		TYPE_OBJECT:
+			return "Object"
+		TYPE_DICTIONARY:
+			return "Dictionary"
+		TYPE_ARRAY:
+			return "Array"
+		TYPE_RAW_ARRAY:
+			return "PoolByteArray"
+		TYPE_INT_ARRAY:
+			return "PoolIntArray"
+		TYPE_REAL_ARRAY:
+			return "PoolRealArray"
+		TYPE_STRING_ARRAY:
+			return "PoolStringArray"
+		TYPE_VECTOR2_ARRAY:
+			return "Vector2Array"
+		TYPE_VECTOR3_ARRAY:
+			return "Vector3Array"
+		TYPE_COLOR_ARRAY:
+			return "ColorArray"
+		_:
+			return "Unknown"
+
+static func format_type(type : Dictionary, none_name := "void") -> String:
+	match type["type"]:
+		TYPE_NIL:
+			return none_name
+		TYPE_OBJECT:
+			return type.get("class_name", "Object")
+		var tp:
+			return type_name(tp)
+
+static func format_method_signature(method : Dictionary, format := "{return} {name}({args})") -> String:
+	var args := PoolStringArray()
+	var rettype := "void"
+	if method.has("return"):
+		rettype = format_type(method["return"])
+	for i in range(method["args"].size()):
+		var arg = method["args"][i]
+		var def = "" 
+		if i < method["default_args"].size():
+			def = " = %s" % str(method["default_args"][i])
+		args.append("{name}: {type}{def}".format({
+			"name": arg["name"],
+			"type": format_type(arg, "Variant"),
+			"def": def
+		}))
+	return format.format({
+		"return": rettype,
+		"name": method["name"],
+		"args": args.join(", ")
+	})
+
+static func format_signal_signature(sig : Dictionary) -> String:
+	return format_method_signature(sig, "{name}({args})")
+
+static func get_type_property_list(type : Dictionary) -> Array:
+	match type["type"]:
+		TYPE_VECTOR2:
+			return [
+				{"name": "x", "type": TYPE_REAL},
+				{"name": "y", "type": TYPE_REAL}
+			]
+		TYPE_RECT2:
+			return [
+				{"name": "position", "type": TYPE_VECTOR2},
+				{"name": "size", "type": TYPE_VECTOR2},
+				{"name": "end", "type": TYPE_VECTOR2}
+			]
+		TYPE_VECTOR3:
+			return [
+				{"name": "x", "type": TYPE_REAL},
+				{"name": "y", "type": TYPE_REAL},
+				{"name": "z", "type": TYPE_REAL}
+			]
+		TYPE_TRANSFORM2D:
+			return [
+				{"name": "x", "type": TYPE_VECTOR2},
+				{"name": "y", "type": TYPE_VECTOR2},
+				{"name": "origin", "type": TYPE_VECTOR2}
+			]
+		TYPE_PLANE:
+			return [
+				{"name": "normal", "type": TYPE_VECTOR3},
+				{"name": "x", "type": TYPE_REAL},
+				{"name": "y", "type": TYPE_REAL},
+				{"name": "z", "type": TYPE_REAL},
+				{"name": "d", "type": TYPE_REAL}
+			]
+		TYPE_QUAT:
+			return [
+				{"name": "x", "type": TYPE_REAL},
+				{"name": "y", "type": TYPE_REAL},
+				{"name": "z", "type": TYPE_REAL},
+				{"name": "w", "type": TYPE_REAL}
+			]
+		TYPE_AABB:
+			return [
+				{"name": "position", "type": TYPE_VECTOR3},
+				{"name": "size", "type": TYPE_VECTOR3},
+				{"name": "end", "type": TYPE_VECTOR3}
+			]
+		TYPE_BASIS:
+			return [
+				{"name": "x", "type": TYPE_VECTOR3},
+				{"name": "y", "type": TYPE_VECTOR3},
+				{"name": "z", "type": TYPE_VECTOR3}
+			]
+		TYPE_TRANSFORM:
+			return [
+				{"name": "basis", "type": TYPE_BASIS},
+				{"name": "origin", "type": TYPE_VECTOR3}
+			]
+		TYPE_COLOR:
+			return [
+				{"name": "r", "type": TYPE_REAL},
+				{"name": "g", "type": TYPE_REAL},
+				{"name": "b", "type": TYPE_REAL},
+				{"name": "a", "type": TYPE_REAL},
+				{"name": "h", "type": TYPE_REAL},
+				{"name": "s", "type": TYPE_REAL},
+				{"name": "v", "type": TYPE_REAL},
+				{"name": "r8", "type": TYPE_INT},
+				{"name": "g8", "type": TYPE_INT},
+				{"name": "b8", "type": TYPE_INT},
+				{"name": "a8", "type": TYPE_INT}
+			]
+		TYPE_OBJECT:
+			if type.has("class_name"):
+				return ClassDB.class_get_property_list(type["class_name"])
+	return []
+
+static func get_property_type(obj : Object, property : String) -> int:
+	return typeof(obj.get(property)) # TODO
+
+static func get_method_arg_types(obj : Object, method : String) -> Array:
+	var methods := obj.get_method_list()
+	var types := []
+	for ele in methods:
+		if ele["name"] == method:
+			for arg in ele["args"]:
+				types.append(arg["type"])
+			break
+	return types
+
+static func get_scene_tree() -> SceneTree:
+	return Engine.get_main_loop() as SceneTree
+
+static func wait_frames(nframes : int) -> void:
+	var tree := get_scene_tree()
+	for i in range(max(1, nframes)): # yield at least once so this always returns a GDScriptFunctionState
+		yield(tree, "idle_frame")
+
+static func disconnect_all(sender : Object, receiver : Object, signal_name := "") -> void:
+	if signal_name == "":
+		for sig in sender.get_signal_list():
+			disconnect_all(sender, receiver, sig["name"])
+		return
+	
+	for connection in sender.get_signal_connection_list(signal_name):
+		if connection["target"] != receiver:
+			continue
+		sender.disconnect(signal_name, receiver, connection["method"])
+
+static func copy_signal_handlers(target : Object, source : Object, sig_name : String) -> void:
+	for connection in source.get_signal_connection_list(sig_name):
+		target.connect(sig_name, connection["target"], connection["method"], connection["binds"])
+
+static func copy_all_signal_handlers(target : Object, source : Object, sig_names : Array) -> void:
+	for sig_name in sig_names:
+		copy_signal_handlers(target, source, sig_name)
+
+static func control_is_in_front_of(front : Control, back : Control) -> bool:
+	var front_popup : bool = find_parent_with_type(front, Popup) != null
+	var back_popup : bool = find_parent_with_type(back, Popup) != null
+	
+	if front_popup && !back_popup:
+		return true
+	elif !front_popup && back_popup:
+		return false
+	elif front_popup && back_popup:
+		return popup_is_in_front_of(front, back)
+	else:
+		return back.is_greater_than(front)
+
+static func popup_is_in_front_of(front : Popup, back : Popup) -> bool:
+	return back.is_greater_than(front) # no idea?!
+
+static func get_state_object(meta_key : String, type):
+	var tree := get_scene_tree()
+	if !tree.has_meta(meta_key):
+		tree.set_meta(meta_key, type.new())
+	return tree.get_meta(meta_key)
+
+static func translate(text : String) -> String:
+	return get_scene_tree().root.tr(text)
+
+#################
+# private stuff #
+#################
+static func __find_nodes_by_type(root : Node, tp, as_path, result):
+	if root is tp:
+		if as_path:
+			result.append(root.get_path())
+		else:
+			result.append(root)
+	for child in root.get_children():
+		__find_nodes_by_type(child, tp, as_path, result)
+	return result
+
+static func __find_nodes_with_member(root : Node, member : String, result):
+	if root.get(member) != null:
+		result.append(root)
+	for child in root.get_children():
+		__find_nodes_with_member(child, member, result)