diff --git a/amf3.py b/amf3.py
new file mode 100644
index 0000000..62996f7
--- /dev/null
+++ b/amf3.py
@@ -0,0 +1,132 @@
+from pyraknet.bitstream import c_double, c_ubyte
+
+UNDEFINED_MARKER = 0
+FALSE_MARKER = 2
+TRUE_MARKER = 3
+DOUBLE_MARKER = 5
+STRING_MARKER = 6
+ARRAY_MARKER = 9
+
+class AMF3Reader:
+	def read(self, data):
+		self.str_ref_table = []
+		self.data = data
+		return self.read_type()
+
+	def read_u29(self):
+		# variable-length unsigned integer
+		value = 0
+		for i in range(4):
+			byte = self.data.read(c_ubyte)
+			if i < 4:
+				value = (value << 7) | byte & 0x7f
+				if not byte & 0x80:
+					break
+			else:
+				value = (value << 8) | byte
+		return value
+
+	def read_type(self):
+		marker = self.data.read(c_ubyte)
+		if marker == UNDEFINED_MARKER:
+			return None
+		if marker == FALSE_MARKER:
+			return False
+		if marker == TRUE_MARKER:
+			return True
+		if marker == DOUBLE_MARKER:
+			return self.data.read(c_double)
+		if marker == STRING_MARKER:
+			return self.read_str()
+		if marker == ARRAY_MARKER:
+			return self.read_array()
+		raise NotImplementedError(marker)
+
+	def read_str(self):
+		value = self.read_u29()
+		is_literal = value & 0x01
+		value >>= 1
+		if not is_literal:
+			return self.str_ref_table[value]
+		str_ = self.data.read(bytes, length=value).decode()
+		if str_:
+			self.str_ref_table.append(str_)
+		return str_
+
+	def read_array(self):
+		value = self.read_u29()
+		is_literal = value & 0x01
+		value >>= 1
+		if not is_literal:
+			raise NotImplementedError
+		size = value
+		array = {}
+		while True:
+			key = self.read_str()
+			if key == "":
+				break
+			value = self.read_type()
+			array[key] = value
+
+		for i in range(size):
+			value = self.read_type()
+			array[i] = value
+
+		return array
+
+class AMF3Writer:
+	def write(self, data, out):
+		self.out = out
+		# todo: references (optional)
+		self.write_type(data)
+
+	def write_u29(self, value):
+		if value < 0x80:
+			self.out.write(c_ubyte(value))
+		elif value < 0x4000:
+			self.out.write(c_ubyte((value >> 7) | 0x80))
+			self.out.write(c_ubyte(value & 0x7f))
+		elif value < 0x200000:
+			self.out.write(c_ubyte((value >> 14) | 0x80))
+			self.out.write(c_ubyte((value >> 7) | 0x80))
+			self.out.write(c_ubyte(value & 0x7f))
+		elif value < 0x20000000:
+			self.out.write(c_ubyte((value >> 22) | 0x80))
+			self.out.write(c_ubyte((value >> 15) | 0x80))
+			self.out.write(c_ubyte((value >> 7) | 0x80))
+			self.out.write(c_ubyte(value & 0xff))
+
+	def write_type(self, value):
+		if value is None:
+			self.out.write(c_ubyte(UNDEFINED_MARKER))
+		elif value is False:
+			self.out.write(c_ubyte(FALSE_MARKER))
+		elif value is True:
+			self.out.write(c_ubyte(TRUE_MARKER))
+		elif isinstance(value, float):
+			self.out.write(c_ubyte(DOUBLE_MARKER))
+			self.out.write(c_double(value))
+		elif isinstance(value, str):
+			self.out.write(c_ubyte(STRING_MARKER))
+			self.write_str(value)
+		elif isinstance(value, dict):
+			self.out.write(c_ubyte(ARRAY_MARKER))
+			self.write_array(value)
+		else:
+			raise NotImplementedError(value)
+
+	def write_str(self, str_):
+		encoded = str_.encode()
+		self.write_u29((len(encoded) << 1) | 0x01)
+		self.out.write(encoded)
+
+	def write_array(self, array):
+		self.write_u29(0x01) # literal, 0 dense items
+		for key, value in array.items():
+			assert isinstance(key, str)
+			self.write_str(key)
+			self.write_type(value)
+		self.write_str("")
+
+read = AMF3Reader().read
+write = AMF3Writer().write
diff --git a/captureviewer.pyw b/captureviewer.pyw
index 5eed703..ed3c8c6 100644
--- a/captureviewer.pyw
+++ b/captureviewer.pyw
@@ -8,8 +8,9 @@ import zipfile
 from collections import OrderedDict
 from tkinter import BooleanVar, END, Menu
 
-import viewer
+import amf3
 import structparser
+import viewer
 from pyraknet.bitstream import BitStream, c_bit, c_float, c_int, c_int64, c_ubyte, c_uint, c_uint64, c_ushort
 
 with open("packetdefinitions/replica/creation_header.structs", encoding="utf-8") as file:
@@ -525,6 +526,8 @@ class CaptureViewer(viewer.Viewer):
 						value = packet.read(str, length_type=c_uint)
 						if value:
 							assert packet.read(c_ushort) == 0 # for some reason has a null terminator
+					elif type_ == "NDGFxValue":
+						value = amf3.read(packet)
 					elif type_ in local_enums:
 						value = packet.read(c_uint)
 						value = local_enums[type_][value]+" ("+str(value)+")"