refactor: Far more well-functioning baseline.

code/blender_maxwell/node_trees/maxwell_sim_nodes/__init__.py

@@ -1,11 +1,11 @@
+from . import sockets
+from . import node_tree
 from . import nodes
 from . import categories
-from . import socket_types
-from . import tree
 
 BL_REGISTER = [
-	*tree.BL_REGISTER,
-	*socket_types.BL_REGISTER,
+	*sockets.BL_REGISTER,
+	*node_tree.BL_REGISTER,
 	*nodes.BL_REGISTER,
 	*categories.BL_REGISTER,
 ]

code/blender_maxwell/node_trees/maxwell_sim_nodes/categories.py

@@ -1,18 +1,10 @@
+## TODO: Refactor this whole horrible module.
+
 import bpy
 import nodeitems_utils
-from . import types
+from . import contracts
 from .nodes import BL_NODES
 
-####################
-# - Assembly of Node Categories
-####################
-class MaxwellSimNodeCategory(nodeitems_utils.NodeCategory):
-	@classmethod
-	def poll(cls, context):
-		"""Constrain node category availability to within a MaxwellSimTree."""
-		
-		return context.space_data.tree_type == types.TreeType.MaxwellSim.value
-
 DYNAMIC_SUBMENU_REGISTRATIONS = []
 def mk_node_categories(
 	tree,
@@ -23,7 +15,7 @@ def mk_node_categories(
 	items = []
 	
 	# Add Node Items
-	base_category = types.NodeCategory["_".join(syllable_prefix)]
+	base_category = contracts.NodeCategory["_".join(syllable_prefix)]
 	for node_type, node_category in BL_NODES.items():
 		if node_category == base_category:
 			items.append(nodeitems_utils.NodeItem(node_type.value))
@@ -31,7 +23,7 @@ def mk_node_categories(
 	# Add Node Sub-Menus
 	for syllable, sub_tree in tree.items():
 		current_syllable_path = syllable_prefix + [syllable]
-		current_category = types.NodeCategory[
+		current_category = contracts.NodeCategory[
 			"_".join(current_syllable_path)
 		]
 		
@@ -51,10 +43,12 @@ def mk_node_categories(
 						nodeitems_utils.NodeItem,
 					):
 						nodeitem = nodeitem_or_submenu
-						self.layout.operator(
+						op_add_node_cfg = self.layout.operator(
 							"node.add_node",
 							text=nodeitem.label,
-						).type = nodeitem.nodetype
+						)
+						op_add_node_cfg.type = nodeitem.nodetype
+						op_add_node_cfg.use_transform = True
 					elif isinstance(nodeitem_or_submenu, str):
 						submenu_id = nodeitem_or_submenu
 						self.layout.menu(submenu_id)
@@ -62,7 +56,7 @@ def mk_node_categories(
 		
 		menu_class = type(current_category.value, (bpy.types.Menu,), {
 			'bl_idname': current_category.value,
-			'bl_label': types.NodeCategory_to_category_label[current_category],
+			'bl_label': contracts.NodeCategory_to_category_label[current_category],
 			'draw': draw_factory(tuple(subitems)),
 		})
 		
@@ -78,7 +72,7 @@ def mk_node_categories(
 # - Blender Registration
 ####################
 BL_NODE_CATEGORIES = mk_node_categories(
-	types.NodeCategory.get_tree()["MAXWELL"]["SIM"],
+	contracts.NodeCategory.get_tree()["MAXWELL"]["SIM"],
 	syllable_prefix = ["MAXWELL", "SIM"],
 )
 ## TODO: refractor, this has a big code smell
@@ -88,7 +82,7 @@ BL_REGISTER = [
 
 ## TEST - TODO this is a big code smell
 def menu_draw(self, context):
-	if context.space_data.tree_type == types.TreeType.MaxwellSim.value:
+	if context.space_data.tree_type == contracts.TreeType.MaxwellSim.value:
 		for nodeitem_or_submenu in BL_NODE_CATEGORIES:
 			if isinstance(nodeitem_or_submenu, str):
 				submenu_id = nodeitem_or_submenu

code/blender_maxwell/node_trees/maxwell_sim_nodes/constants.py

@@ -1,20 +0,0 @@
-####################
-# - Colors
-####################
-COLOR_SOCKET_SOURCE = (0.4, 0.4, 0.9, 1.0)
-COLOR_SOCKET_MEDIUM = (1.0, 0.4, 0.2, 1.0)
-COLOR_SOCKET_STRUCTURE = (0.2, 0.4, 0.8, 1.0)
-COLOR_SOCKET_BOUND = (0.7, 0.8, 0.7, 1.0)
-COLOR_SOCKET_FDTDSIM = (0.9, 0.9, 0.9, 1.0)
-
-
-####################
-# - Icons
-####################
-ICON_SIM = 'MOD_SIMPLEDEFORM'
-
-ICON_SIM_SOURCE = 'FORCE_CHARGE'
-ICON_SIM_MEDIUM = 'MATSHADERBALL'
-ICON_SIM_STRUCTURE = 'OUTLINER_DATA_MESH'
-ICON_SIM_BOUND = 'MOD_MESHDEFORM'
-ICON_SIM_SIMULATION = ICON_SIM

code/blender_maxwell/node_trees/maxwell_sim_nodes/contracts.py

@@ -1,10 +1,72 @@
-import bpy
+import typing as typ
+import typing_extensions as pytypes_ext
 import enum
 
+import sympy as sp
+import sympy.physics.units as spu
+import pydantic as pyd
+import bpy
+
 from ...utils.blender_type_enum import (
 	BlenderTypeEnum, append_cls_name_to_values
 )
 
+####################
+# - String Types
+####################
+BlenderColorRGB = tuple[float, float, float, float]
+BlenderID = pytypes_ext.Annotated[str, pyd.StringConstraints(
+	pattern=r'^[A-Z_]+$',
+)]
+
+# Socket ID
+SocketName = pytypes_ext.Annotated[str, pyd.StringConstraints(
+	pattern=r'^[a-zA-Z0-9_]+$',
+)]
+BLSocketName = pytypes_ext.Annotated[str, pyd.StringConstraints(
+	pattern=r'^[a-zA-Z0-9_]+$',
+)]
+
+# Socket ID
+PresetID = pytypes_ext.Annotated[str, pyd.StringConstraints(
+	pattern=r'^[A-Z_]+$',
+)]
+
+####################
+# - Generic Types
+####################
+SocketReturnType = typ.TypeVar('SocketReturnType', covariant=True)
+## - Covariance: If B subtypes A, then Container[B] subtypes Container[A].
+## - This is absolutely what we want here.
+
+####################
+# - Sympy Expression Typing
+####################
+ALL_UNIT_SYMBOLS = {
+	unit
+	for unit in spu.__dict__.values()
+	if isinstance(unit, spu.Quantity)
+}
+def has_units(expr: sp.Expr):
+	return any(
+		symbol in ALL_UNIT_SYMBOLS
+		for symbol in expr.atoms(sp.Symbol)
+	)
+def is_exactly_expressed_as_unit(expr: sp.Expr, unit) -> bool:
+	#try:
+	converted_expr = expr / unit
+	
+	return (
+		converted_expr.is_number
+		and not converted_expr.has(spu.Quantity)
+	)
+
+####################
+# - Icon Types
+####################
+class Icon(BlenderTypeEnum):
+	MaxwellSimTree = "MOD_SIMPLEDEFORM"
+
 ####################
 # - Tree Types
 ####################
@@ -17,6 +79,17 @@ class TreeType(BlenderTypeEnum):
 ####################
 @append_cls_name_to_values
 class SocketType(BlenderTypeEnum):
+	Any = enum.auto()
+	Text = enum.auto()
+	FilePath = enum.auto()
+	
+	RationalNumber = enum.auto()
+	RealNumber = enum.auto()
+	ComplexNumber = enum.auto()
+	
+	PhysicalLength = enum.auto()
+	PhysicalArea = enum.auto()
+	
 	MaxwellSource = enum.auto()
 	MaxwellMedium = enum.auto()
 	MaxwellStructure = enum.auto()
@@ -132,7 +205,7 @@ class NodeType(BlenderTypeEnum):
 	KSpaceNearFieldProjectionMonitor = enum.auto()
 	
 	# Simulations
-	FDTDSimulation = enum.auto()
+	FDTDSim = enum.auto()
 	
 	SimulationGridDiscretization = enum.auto()
 	
@@ -155,8 +228,6 @@ class NodeType(BlenderTypeEnum):
 ####################
 # - Node Category Types
 ####################
-#@append_cls_name_to_values
-#@append_cls_name_to_values
 class NodeCategory(BlenderTypeEnum):
 	MAXWELL_SIM = enum.auto()
 	
@@ -219,6 +290,7 @@ class NodeCategory(BlenderTypeEnum):
 	
 	@classmethod
 	def get_tree(cls):
+		## TODO: Refactor
 		syllable_categories = [
 			node_category.value.split("_")
 			for node_category in cls
@@ -296,3 +368,104 @@ NodeCategory_to_category_label = {
 	NodeCategory.MAXWELL_SIM_UTILITIES_MATH: "Math",
 	NodeCategory.MAXWELL_SIM_UTILITIES_FIELDMATH: "Field Math",
 }
+
+
+
+####################
+# - Protocols
+####################
+class SocketDefProtocol(typ.Protocol):
+	socket_type: SocketType
+	label: str
+	
+	def init(self, bl_socket: bpy.types.NodeSocket) -> None:
+		...
+
+class PresetDef(pyd.BaseModel):
+	label: str
+	description: str
+	values: dict[SocketName, typ.Any]
+
+@typ.runtime_checkable
+#class BLSocketProtocol(typ.Protocol):
+#	socket_type: SocketType
+#	socket_color: BlenderColorRGB
+#	
+#	bl_label: str
+#	
+#	compatible_types: dict[typ.Type, set[typ.Callable[[typ.Any], bool]]]
+#	
+#	def draw(
+#		self,
+#		context: bpy.types.Context,
+#		layout: bpy.types.UILayout,
+#		node: bpy.types.Node,
+#		text: str,
+#	) -> None:
+#		...
+#	
+#	@property
+#	def default_value(self) -> typ.Any:
+#		...
+#	@default_value.setter
+#	def default_value(self, value: typ.Any) -> typ.Any:
+#		...
+#	
+
+@typ.runtime_checkable
+class NodeTypeProtocol(typ.Protocol):
+	node_type: NodeType
+	
+	bl_label: str
+	
+	input_sockets: dict[SocketName, SocketDefProtocol]
+	output_sockets: dict[SocketName, SocketDefProtocol]
+	presets: dict[PresetID, PresetDef] | None
+	
+	# Built-In Blender Methods
+	def init(self, context: bpy.types.Context) -> None:
+		...
+	
+	def draw_buttons(
+		self,
+		context: bpy.types.Context,
+		layout: bpy.types.UILayout,
+	) -> None:
+		...
+	
+	@classmethod
+	def poll(cls, ntree: bpy.types.NodeTree) -> None:
+		...
+	
+	# Socket Getters
+	def g_input_bl_socket(
+		self,
+		input_socket_name: SocketName,
+	) -> bpy.types.NodeSocket:
+		...
+	
+	def g_output_bl_socket(
+		self,
+		output_socket_name: SocketName,
+	) -> bpy.types.NodeSocket:
+		...
+	
+	# Socket Methods
+	def s_input_value(
+		self,
+		input_socket_name: SocketName,
+		value: typ.Any
+	) -> typ.Any:
+		...
+	
+	# Data-Flow Methods
+	def compute_input(
+		self,
+		input_socket_name: SocketName,
+	) -> typ.Any:
+		...
+	def compute_output(
+		self,
+		output_socket_name: SocketName,
+	) -> typ.Any:
+		...

code/blender_maxwell/node_trees/maxwell_sim_nodes/node_tree.py

@@ -0,0 +1,57 @@
+import bpy
+
+from . import contracts
+
+ICON_SIM_TREE = 'MOD_SIMPLEDEFORM'
+
+####################
+# - Node Tree Definition
+####################
+class MaxwellSimTree(bpy.types.NodeTree):
+	bl_idname = contracts.TreeType.MaxwellSim
+	bl_label = "Maxwell Sim Editor"
+	bl_icon = contracts.Icon.MaxwellSimTree
+
+####################
+# - Blender Registration
+####################
+BL_REGISTER = [
+	MaxwellSimTree,
+]
+
+
+
+####################
+# - Red Edges on Error
+####################
+## TODO: Refactor
+#def link_callback_new(context):
+#	print("A THING HAPPENED")
+#	node_tree_type = contracts.TreeType.MaxwellSim.value
+#	link = context.link
+#	
+#	if not (
+#		link.from_node.node_tree.bl_idname == node_tree_type
+#		and link.to_node.node_tree.bl_idname == node_tree_type
+#	):
+#		return
+#	
+#	source_node = link.from_node
+#	
+#	source_socket_name = source_node.g_output_socket_name(
+#		link.from_socket.name
+#	)
+#	link_data = source_node.compute_output(source_socket_name)
+#	
+#	destination_socket = link.to_socket
+#	link.is_valid = destination_socket.is_compatible(link_data)
+#	
+#	print(source_node, destination_socket, link.is_valid)
+#
+#bpy.msgbus.subscribe_rna(
+#	key=("active", "node_tree"),
+#	owner=MaxwellSimTree,
+#	args=(bpy.context,),
+#	notify=link_callback_new,
+#	options={'PERSISTENT'}
+#)

code/blender_maxwell/node_trees/maxwell_sim_nodes/nodes/__init__.py

@@ -1,8 +1,23 @@
+from . import inputs
+from . import outputs
+from . import sources
 from . import mediums
+from . import simulations
+from . import structures
 
 BL_REGISTER = [
+	*inputs.BL_REGISTER,
+	*outputs.BL_REGISTER,
 	*mediums.BL_REGISTER,
+	*sources.BL_REGISTER,
+	*simulations.BL_REGISTER,
+	*structures.BL_REGISTER,
 ]
 BL_NODES = {
+	**inputs.BL_NODES,
+	**outputs.BL_NODES,
+	**sources.BL_NODES,
 	**mediums.BL_NODES,
+	**simulations.BL_NODES,
+	**structures.BL_NODES,
 }

code/blender_maxwell/node_trees/maxwell_sim_nodes/nodes/base.py

@@ -0,0 +1,412 @@
+import typing as typ
+import typing_extensions as pytypes_ext
+
+import bpy
+import pydantic as pyd
+
+from .. import contracts
+from .. import sockets
+
+####################
+# - Decorator: Output Socket Computation
+####################
+@typ.runtime_checkable
+class ComputeOutputSocketFunc(typ.Protocol[contracts.SocketReturnType]):
+	"""Protocol describing a function that computes the value of an
+	output socket.
+	"""
+	
+	def __call__(
+		_self,
+		self: contracts.NodeTypeProtocol,
+	) -> contracts.SocketReturnType:
+		"""Describes the function signature of all functions that compute
+		the value of an output socket.
+		
+		Args:
+			node: A node in the tree, passed via the 'self' attribute of the
+				node.
+		
+		Returns:
+			The value of the output socket, as the relevant type.
+		"""
+		...
+
+class PydanticProtocolMeta(type(pyd.BaseModel), type(typ.Protocol)): pass
+
+class FuncOutputSocket(
+	pyd.BaseModel,
+	typ.Generic[contracts.SocketReturnType],
+	ComputeOutputSocketFunc[contracts.SocketReturnType],
+	metaclass=PydanticProtocolMeta,
+):
+	"""Defines a function (-like object) that defines an attachment from
+	an output socket name, to the original method that computes the value of
+	an output socket.
+	
+	Conforms to the protocol `ComputeOutputSocketFunc`.
+	Validation is provided by subtyping `pydantic.BaseModel`.
+	
+	Attributes:
+		output_socket_func: The original method computing the value of an
+			output socket.
+		output_socket_name: The SocketName of the output socket for which
+			this function should be called to compute.
+	"""
+	
+	output_socket_func: typ.Callable[
+		[contracts.NodeTypeProtocol],
+		contracts.SocketReturnType,
+	]
+	output_socket_name: contracts.SocketName
+	
+	def __call__(
+		self,
+		node: contracts.NodeTypeProtocol
+	) -> contracts.SocketReturnType:
+		"""Computes the value of an output socket.
+		
+		Args:
+			node: A node in the tree, passed via the 'self' attribute of the
+				node.
+		
+		Returns:
+			The value of the output socket, as the relevant type.
+		"""
+		
+		return self.output_socket_func(node)
+
+# Define Factory Function & Decorator 
+def computes_output_socket(
+	output_socket_name: contracts.SocketName,
+	return_type: typ.Generic[contracts.SocketReturnType],
+) -> typ.Callable[
+	[ComputeOutputSocketFunc[contracts.SocketReturnType]],
+	FuncOutputSocket[contracts.SocketReturnType],
+]:
+	"""Given a socket name, defines a function-that-makes-a-function (aka.
+	decorator) which has the name of the socket attached.
+	
+	Must be used as a decorator, ex. `@compute_output_socket("name")`.
+	
+	Args:
+		output_socket_name: The name of the output socket to attach the
+			decorated method to.
+	
+	Returns:
+		The decorator, which takes the output-socket-computing method
+			and returns a new output-socket-computing method, now annotated
+			and discoverable by the `MaxwellSimTreeNode`.
+	"""
+	
+	def decorator(
+		output_socket_func: ComputeOutputSocketFunc[contracts.SocketReturnType]
+	) -> FuncOutputSocket[contracts.SocketReturnType]:
+		return FuncOutputSocket(
+			output_socket_func=output_socket_func,
+			output_socket_name=output_socket_name,
+		)
+	
+	return decorator
+
+
+
+####################
+# - Node Callbacks
+####################
+def sync_selected_preset(node: contracts.NodeTypeProtocol) -> None:
+	"""Whenever a preset is set in a NodeTypeProtocol, this function
+	should be called to overwrite the `default_value`s of the input sockets
+	with the actual preset values.
+	
+	Args:
+		node: The node for which input socket `default_value`s should be
+			set to the values defined within the currently selected preset.
+	"""
+	if node.preset is None:
+		msg = f"Node {node} has no preset EnumProperty"
+		raise ValueError(msg)
+	
+	if node.presets is None:
+		msg = f"Node {node} has preset EnumProperty, but no defined presets."
+		raise ValueError(msg)
+	
+	# Set Input Sockets to Preset Values
+	preset_def = node.presets[node.preset]
+	for input_socket_name, value in preset_def.values.items():
+		node.s_input_value(input_socket_name, value)
+
+
+
+####################
+# - Node Superclass Definition
+####################
+class MaxwellSimTreeNode(bpy.types.Node):
+	"""A base type for nodes that greatly simplifies the implementation of
+	reliable, powerful nodes.
+	
+	Should be used together with `contracts.NodeTypeProtocol`.
+	"""
+	def __init_subclass__(cls, **kwargs: typ.Any):
+		super().__init_subclass__(**kwargs)  ## Yucky superclass setup.
+		
+		# Set bl_idname
+		cls.bl_idname = cls.node_type.value 
+		
+		# Declare Node Property: 'preset' EnumProperty
+		if hasattr(cls, "presets"):
+			first_preset = list(cls.presets.keys())[0]
+			cls.__annotations__["preset"] = bpy.props.EnumProperty(
+				name="Presets",
+				description="Select a preset",
+				items=[
+					(
+						preset_name,
+						preset_def.label,
+						preset_def.description,
+					)
+					for preset_name, preset_def in cls.presets.items()
+				],
+				default=first_preset,  ## 1st is Default
+				update=(lambda self, context: sync_selected_preset(self)),
+			)
+		else:
+			cls.preset = None
+			cls.presets = None
+	
+	####################
+	# - Blender Init / Constraints
+	####################
+	def init(self, context: bpy.types.Context):
+		"""Declares input and output sockets as described by the
+		`NodeTypeProtocol` specification, and initializes each as described
+		by user-provided `SocketDefProtocol`s.
+		"""
+		# Initialize Input Sockets
+		for socket_name, socket_def in self.input_sockets.items():
+			self.inputs.new(
+				socket_def.socket_type.value,  ## strenum.value => a real str
+				socket_def.label,
+			)
+			
+			# Retrieve the Blender Socket (bpy.types.NodeSocket)
+			## We could use self.g_input_bl_socket()...
+			## ...but that would rely on implicit semi-initialized state.
+			bl_socket = self.inputs[
+				self.input_sockets[socket_name].label
+			]
+			
+			# Initialize the Socket from the Socket Definition
+			## `bl_socket` knows whether it's an input or output socket...
+			## ...via its `.is_output` attribute.
+			socket_def.init(bl_socket)
+		
+		# Initialize Output Sockets
+		for socket_name, socket_def in self.output_sockets.items():
+			self.outputs.new(
+				socket_def.socket_type.value,
+				socket_def.label,
+			)
+			
+			bl_socket = self.outputs[
+				self.output_sockets[socket_name].label
+			]
+			socket_def.init(bl_socket)
+		
+		# Sync Default Preset to Input Socket Values
+		if self.preset is not None:
+			sync_selected_preset(self)
+	
+	@classmethod
+	def poll(cls, ntree: bpy.types.NodeTree) -> bool:
+		"""This class method controls whether a node can be instantiated
+		in a given node tree.
+		
+		In our case, we restrict node instantiation to within a
+		MaxwellSimTree.
+		
+		Args:
+			ntree: The node tree within which the user is currently working.
+		
+		Returns:
+			Whether or not the user should be able to instantiate the node.
+		
+		"""
+		
+		return ntree.bl_idname == contracts.TreeType.MaxwellSim.value
+	
+	####################
+	# - UI Methods
+	####################
+	def draw_buttons(
+		self,
+		context: bpy.types.Context,
+		layout: bpy.types.UILayout,
+	) -> None:
+		"""This method draws the UI of the node itself.
+		
+		Specifically, it is used to expose the Presets dropdown.
+		"""
+		if self.preset is not None:
+			layout.prop(self, "preset", text="")
+		
+		if hasattr(self, "draw_operators"):
+			self.draw_operators(context, layout)
+	
+	####################
+	# - Socket Getters
+	####################
+	def g_input_bl_socket(
+		self,
+		input_socket_name: contracts.SocketName,
+	) -> bpy.types.NodeSocket:
+		"""Returns the `bpy.types.NodeSocket` of an input socket by name.
+		
+		Args:
+			input_socket_name: The name of the input socket, as defined in
+				`self.input_sockets`.
+		
+		Returns:
+			Blender's own node socket object.
+		"""
+		
+		# (Guard) Socket Exists
+		if input_socket_name not in self.input_sockets:
+			msg = f"Input socket with name {input_socket_name} does not exist"
+			raise ValueError(msg)
+		
+		return self.inputs[self.input_sockets[input_socket_name].label]
+	
+	def g_output_bl_socket(
+		self,
+		output_socket_name: contracts.SocketName,
+	) -> bpy.types.NodeSocket:
+		"""Returns the `bpy.types.NodeSocket` of an output socket by name.
+		
+		Args:
+			output_socket_name: The name of the output socket, as defined in
+				`self.output_sockets`.
+		
+		Returns:
+			Blender's own node socket object.
+		"""
+		
+		# (Guard) Socket Exists
+		if output_socket_name not in self.output_sockets:
+			msg = f"Input socket with name {output_socket_name} does not exist"
+			raise ValueError(msg)
+		
+		return self.outputs[self.output_sockets[output_socket_name].label]
+	
+	def g_output_socket_name(
+		self,
+		output_bl_socket_name: contracts.BLSocketName,
+	) -> contracts.SocketName:
+			return next(
+				output_socket_name
+				for output_socket_name in self.output_sockets.keys()
+				if self.output_sockets[
+					output_socket_name
+				].label == output_bl_socket_name
+			)
+	
+	####################
+	# - Socket Setters
+	####################
+	def s_input_value(
+		self,
+		input_socket_name: contracts.SocketName,
+		value: typ.Any,
+	) -> None:
+		"""Sets the value of an input socket, if the value is compatible with
+		the socket.
+		
+		Args:
+			input_socket_name: The name of the input socket.
+			value: The value to set, which must be compatible with the
+				socket.
+		
+		Raises:
+			ValueError: If the value is incompatible with the socket, for
+				example due to incompatible types, then a ValueError will be
+				raised.
+		"""
+		bl_socket = self.g_input_bl_socket(input_socket_name)
+		
+		# Set the Value
+		bl_socket.default_value = value
+	
+	####################
+	# - Socket Computation
+	####################
+	def compute_input(
+		self,
+		input_socket_name: contracts.SocketName,
+	) -> typ.Any:
+		"""Computes the value of an input socket, by its name. Will
+		automatically compute the output socket value of any linked
+		nodes.
+		
+		Args:
+			input_socket_name: The name of the input socket, as defined in
+				`self.input_sockets`.
+		"""
+		bl_socket = self.g_input_bl_socket(input_socket_name)
+		
+		# Linked: Compute Output of Linked Socket
+		if bl_socket.is_linked:
+			linked_node = bl_socket.links[0].from_node
+			
+			# Compute the Linked Socket Name
+			linked_bl_socket_name: contracts.BLSocketName = bl_socket.links[0].from_socket.name
+			linked_socket_name = linked_node.g_output_socket_name(
+				linked_bl_socket_name
+			)
+			
+			# Compute the Linked Socket Value
+			linked_socket_value = linked_node.compute_output(
+				linked_socket_name
+			)
+			
+			# (Guard) Check the Compatibility of the Linked Socket Value
+			if not bl_socket.is_compatible(linked_socket_value):
+				msg = f"Tried setting socket ({input_socket_name}) to incompatible value ({linked_socket_value}) of type {type(linked_socket_value)}"
+				raise ValueError(msg)
+			
+			return linked_socket_value
+		
+		# Unlinked: Simply Retrieve Socket Value
+		return bl_socket.default_value
+		
+	def compute_output(
+		self,
+		output_socket_name: contracts.SocketName,
+	) -> typ.Any:
+		"""Computes the value of an output socket name, from its socket name.
+		
+		Searches for methods decorated with `@computes_output_socket("name")`,
+		which describe the computation that occurs to actually compute the
+		value of an output socket from ex. input sockets and node properties.
+		
+		Args:
+			output_socket_name: The name declaring the output socket,
+				for which this method computes the output.
+		
+		Returns:
+			The value of the output socket, as computed by the dedicated method
+			registered using the `@computes_output_socket` decorator.
+		"""
+		# Lookup the Function that Computes the Output Socket
+		## The decorator ALWAYS produces a FuncOutputSocket.
+		## Thus, we merely need to find a FuncOutputSocket
+		output_socket_func = next(
+			method.output_socket_func
+			for attr_name in dir(self)  ## Lookup self.*
+			if isinstance(
+				method := getattr(self, attr_name),
+				FuncOutputSocket,
+			)  
+			if method.output_socket_name == output_socket_name
+		)
+		
+		return output_socket_func(self)

code/blender_maxwell/node_trees/maxwell_sim_nodes/nodes/inputs/__init__.py

@@ -0,0 +1,8 @@
+from . import constants
+
+BL_REGISTER = [
+	*constants.BL_REGISTER,
+]
+BL_NODES = {
+	**constants.BL_NODES,
+}

code/blender_maxwell/node_trees/maxwell_sim_nodes/nodes/inputs/constants/__init__.py

@@ -0,0 +1,8 @@
+from . import complex_constant
+
+BL_REGISTER = [
+	*complex_constant.BL_REGISTER,
+]
+BL_NODES = {
+	**complex_constant.BL_NODES,
+}

code/blender_maxwell/node_trees/maxwell_sim_nodes/nodes/inputs/constants/complex_constant.py

@@ -0,0 +1,44 @@
+import bpy
+import sympy as sp
+
+from .... import contracts
+from .... import sockets
+from ... import base
+
+class ComplexConstantNode(base.MaxwellSimTreeNode):
+	node_type = contracts.NodeType.ComplexConstant
+	
+	bl_label = "Complex Constant"
+	#bl_icon = constants.ICON_SIM_INPUT
+	
+	input_sockets = {
+		"value": sockets.ComplexNumberSocketDef(
+			label="Complex",
+		),
+	}
+	output_sockets = {
+		"value": sockets.ComplexNumberSocketDef(
+			label="Complex",
+		),
+	}
+	
+	####################
+	# - Callbacks
+	####################
+	@base.computes_output_socket("value", sp.Expr)
+	def compute_value(self: contracts.NodeTypeProtocol) -> sp.Expr:
+		return self.compute_input("value")
+
+
+
+####################
+# - Blender Registration
+####################
+BL_REGISTER = [
+	ComplexConstantNode,
+]
+BL_NODES = {
+	contracts.NodeType.ComplexConstant: (
+		contracts.NodeCategory.MAXWELL_SIM_INPUTS_CONSTANTS
+	)
+}

code/blender_maxwell/node_trees/maxwell_sim_nodes/nodes/mediums/linear_mediums/alternate_idea.py

@@ -0,0 +1,84 @@
+import bpy
+import gpu
+import gpu_extras
+import sympy.physics.units as spu
+from .... import types, constants
+from ... import node_base
+
+class TripleSellmeierMediumNode(node_base.MaxwellSimTreeNode):
+	bl_idname = types.NodeType.TripleSellmeierMedium.value
+	bl_label = "Triple Sellmeier Medium"
+	bl_icon = constants.ICON_SIM_MEDIUM
+
+	input_sockets = {
+		"B1": (types.SocketType.RealNumber, "B1"),
+		"B2": (types.SocketType.RealNumber, "B2"),
+		"B3": (types.SocketType.RealNumber, "B3"),
+		"C1": (types.SocketType.DimenArea, "C1"),
+		"C2": (types.SocketType.DimenArea, "C2"),
+		"C3": (types.SocketType.DimenArea, "C3"),
+	}
+	output_sockets = {
+		"medium": (types.SocketType.MaxwellMedium, "Medium")
+	}
+	
+	input_unit_defaults = {
+		"B1": None,
+		"B2": None,
+		"B3": None,
+		"C1": spu.um**2,
+		"C2": spu.um**2,
+		"C3": spu.um**2,
+	}
+	socket_presets = {
+		"_description": [
+			('BK7', "BK7 Glass", "Borosilicate crown glass (known as BK7)"),
+			('FUSED_SILICA', "Fused Silica", "Fused silica aka. SiO2"),
+		],
+		"_default": "BK7",
+		"_values": {
+			"BK7": {
+				"B1": 1.03961212,
+				"B2": 0.231792344,
+				"B3": 1.01046945,
+				"C1": 6.00069867e-3 * spu.um**2,
+				"C2": 2.00179144e-2 * spu.um**2,
+				"C3": 103.560653 * spu.um**2,
+			},
+			"FUSED_SILICA": {
+				"B1": 0.696166300,
+				"B2": 0.407942600,
+				"B3": 0.897479400,
+				"C1": 4.67914826e-3 * spu.um**2,
+				"C2": 1.35120631e-2 * spu.um**2,
+				"C3": 97.9340025 * spu.um**2,
+			},
+		}
+	}
+	
+	####################
+	# - Properties
+	####################
+	def draw_buttons(self, context, layout):
+		layout.prop(self, 'preset', text="")
+
+	####################
+	# - Callbacks
+	####################
+	@node_base.output_socket_cb("medium")
+	def compute_medium(self):
+		pass
+
+
+
+####################
+# - Blender Registration
+####################
+BL_REGISTER = [
+	TripleSellmeierMediumNode,
+]
+BL_NODES = {
+	types.NodeType.TripleSellmeierMedium: (
+		types.NodeCategory.MAXWELL_SIM_MEDIUMS_LINEARMEDIUMS
+	)
+}

code/blender_maxwell/node_trees/maxwell_sim_nodes/nodes/mediums/linear_mediums/triple_sellmeier_medium.py

@@ -1,54 +1,90 @@
-import bpy
-from .... import types, constants
-from ... import node_base
+import tidy3d as td
+import sympy as sp
+import sympy.physics.units as spu
 
-class TripleSellmeierMediumNode(node_base.MaxwellSimTreeNode):
-	bl_idname = types.NodeType.TripleSellmeierMedium.value
-	bl_label = "Triple Sellmeier Medium"
-	bl_icon = constants.ICON_SIM_MEDIUM
+from .... import contracts
+from .... import sockets
+from ... import base
 
+class TripleSellmeierMediumNode(base.MaxwellSimTreeNode):
+	node_type = contracts.NodeType.TripleSellmeierMedium
+	
+	bl_label = "Three-Parameter Sellmeier Medium"
+	#bl_icon = ...
+	
+	####################
+	# - Sockets
+	####################
 	input_sockets = {
-		"B1": ("NodeSocketFloat", "B1"),
-		"B2": ("NodeSocketFloat", "B2"),
-		"B3": ("NodeSocketFloat", "B3"),
-		"C1": ("NodeSocketFloat", "C1 (um^2)"),
-		"C2": ("NodeSocketFloat", "C2 (um^2)"),
-		"C3": ("NodeSocketFloat", "C3 (um^2)"),
+		f"B{i}": sockets.RealNumberSocketDef(
+			label=f"B{i}",
+		)
+		for i in [1, 2, 3]
+	} | {
+		f"C{i}": sockets.PhysicalAreaSocketDef(
+			label=f"C{i}",
+			default_unit="UM_SQ"
+		)
+		for i in [1, 2, 3]
 	}
 	output_sockets = {
-		"medium": (types.SocketType.MaxwellMedium, "Medium")
+		"medium": sockets.MaxwellMediumSocketDef(
+			label="Medium"
+		),
 	}
-	socket_presets = {
-		"_description": [
-			('BK7', "BK7 Glass", "Borosilicate crown glass (known as BK7)"),
-			('FUSED_SILICA', "Fused Silica", "Fused silica aka. SiO2"),
-		],
-		"_default": "BK7",
-		"_values": {
-			"BK7": {
+	
+	####################
+	# - Presets
+	####################
+	presets = {
+		"BK7": contracts.PresetDef(
+			label="BK7 Glass",
+			description="Borosilicate crown glass (known as BK7)",
+			values={
 				"B1": 1.03961212,
 				"B2": 0.231792344,
 				"B3": 1.01046945,
-				"C1": 6.00069867e-3,
-				"C2": 2.00179144e-2,
-				"C3": 103.560653,
-			},
-			"FUSED_SILICA": {
+				"C1": 6.00069867e-3 * spu.um**2,
+				"C2": 2.00179144e-2 * spu.um**2,
+				"C3": 103.560653 * spu.um**2,
+			}
+		),
+		"FUSED_SILICA": contracts.PresetDef(
+			label="Fused Silica",
+			description="Fused silica aka. SiO2",
+			values={
 				"B1": 0.696166300,
 				"B2": 0.407942600,
 				"B3": 0.897479400,
-				"C1": 4.67914826e-3,
-				"C2": 1.35120631e-2,
-				"C3": 97.9340025,
-			},
+				"C1": 4.67914826e-3 * spu.um**2,
+				"C2": 1.35120631e-2 * spu.um**2,
+				"C3": 97.9340025 * spu.um**2,
 			}
+		),
 	}
 	
 	####################
-	# - Properties
+	# - Output Socket Computation
 	####################
-	def draw_buttons(self, context, layout):
-		layout.prop(self, 'preset', text="")
+	@base.computes_output_socket("medium", td.Sellmeier)
+	def compute_medium(self: contracts.NodeTypeProtocol) -> td.Sellmeier:
+		## Retrieval
+		#B1 = self.compute_input("B1")
+		#C1_with_units = self.compute_input("C1")
+		#
+		## Processing
+		#C1 = spu.convert_to(C1_with_units, spu.um**2) / spu.um**2
+		
+		return td.Sellmeier(coeffs = [
+			(
+				self.compute_input(f"B{i}"),
+				spu.convert_to(
+					self.compute_input(f"C{i}"),
+					spu.um**2,
+				) / spu.um**2
+			)
+			for i in [1, 2, 3]
+		])
 
 
 
@@ -59,7 +95,7 @@ BL_REGISTER = [
 	TripleSellmeierMediumNode,
 ]
 BL_NODES = {
-	types.NodeType.TripleSellmeierMedium: (
-		types.NodeCategory.MAXWELL_SIM_MEDIUMS_LINEARMEDIUMS
+	contracts.NodeType.TripleSellmeierMedium: (
+		contracts.NodeCategory.MAXWELL_SIM_MEDIUMS_LINEARMEDIUMS
 	)
 }

code/blender_maxwell/node_trees/maxwell_sim_nodes/nodes/node_base.py

@@ -1,140 +0,0 @@
-import numpy as np
-import bpy
-import nodeitems_utils
-
-from .. import types
-
-####################
-# - Decorator: Output Socket
-####################
-def output_socket_cb(name):
-	def decorator(func):
-		func._output_socket_name = name  # Set a marker attribute
-		return func
-	return decorator
-
-####################
-# - Socket Type Casters
-####################
-SOCKET_CAST_MAP = {
-	"NodeSocketBool": bool,
-	"NodeSocketFloat": float,
-	"NodeSocketFloatAngle": float,
-	"NodeSocketFloatDistance": float,
-	"NodeSocketFloatFactor": float,
-	"NodeSocketFloatPercentage": float,
-	"NodeSocketFloatTime": float,
-	"NodeSocketFloatTimeAbsolute": float,
-	"NodeSocketFloatUnsigned": float,
-	"NodeSocketFloatInt": int,
-	"NodeSocketFloatIntFactor": int,
-	"NodeSocketFloatIntPercentage": int,
-	"NodeSocketFloatIntUnsigned": int,
-	"NodeSocketString": str,
-	"NodeSocketVector": np.array,
-	"NodeSocketVectorAcceleration": np.array,
-	"NodeSocketVectorDirection": np.array,
-	"NodeSocketVectorTranslation": np.array,
-	"NodeSocketVectorVelocity": np.array,
-	"NodeSocketVectorXYZ": np.array,
-}
-
-####################
-# - Node Superclass
-####################
-def set_preset(self, context):
-	for preset_name, preset_dict in self.socket_presets["_values"].items():
-		if self.preset == preset_name:
-			for input_socket_name, value in preset_dict.items():
-				self.inputs[
-					self.input_sockets[input_socket_name][1]
-				].default_value = value
-			
-			break
-
-class MaxwellSimTreeNode(bpy.types.Node):
-	def __init_subclass__(cls, **kwargs):
-		super().__init_subclass__(**kwargs)
-		required_attrs = [
-			'bl_idname',
-			'bl_label',
-			'bl_icon',
-			'input_sockets',
-			'output_sockets',
-		]
-		for attr in required_attrs:
-			if getattr(cls, attr, None) is None:
-				raise TypeError(
-					f"class {cls.__name__} is missing required '{attr}' attribute"
-				)
-		
-		if hasattr(cls, 'socket_presets'):
-			cls.__annotations__["preset"] = bpy.props.EnumProperty(
-				name="Presets",
-				description="Select a preset",
-				items=cls.socket_presets["_description"],
-				default=cls.socket_presets["_default"],
-				update=set_preset,
-			)
-	
-	####################
-	# - Node Initialization
-	####################
-	def init(self, context):
-		for input_socket_name in self.input_sockets:
-			self.inputs.new(*self.input_sockets[input_socket_name][:2])
-		
-		for output_socket_name in self.output_sockets:
-			self.outputs.new(*self.output_sockets[output_socket_name][:2])
-		
-		set_preset(self, context)
-	
-	####################
-	# - Node Computation
-	####################
-	def compute_input(self, input_socket_name: str):
-		"""Computes the value of an input socket name.
-		"""
-		bl_socket_type = self.input_sockets[input_socket_name][0]
-		bl_socket = self.inputs[self.input_sockets[input_socket_name][1]]
-		
-		if bl_socket.is_linked:
-			linked_node = bl_socket.links[0].from_node
-			linked_bl_socket_name = bl_socket.links[0].from_socket.name
-			result = linked_node.compute_output(linked_bl_socket_name)
-		else:
-			result = bl_socket.default_value
-		
-		if bl_socket_type in SOCKET_CAST_MAP:
-			return SOCKET_CAST_MAP[bl_socket_type](result)
-		
-		return result
-		
-	def compute_output(self, output_bl_socket_name: str):
-		"""Computes the value of an output socket name, from its Blender display name.
-		"""
-		output_socket_name = next(
-			output_socket_name
-			for output_socket_name in self.output_sockets.keys()
-			if self.output_sockets[output_socket_name][1] == output_bl_socket_name
-		)
-		
-		output_socket_name_to_cb = {
-			getattr(attr, '_output_socket_name'): attr
-			for attr_name in dir(self)
-			if (
-				callable(attr := getattr(self, attr_name))
-				and hasattr(attr, '_output_socket_name')
-			)
-		}
-		
-		return output_socket_name_to_cb[output_socket_name]()
-	
-	####################
-	# - Blender Configuration
-	####################
-	@classmethod
-	def poll(cls, ntree):
-		"""Constrain node instantiation to within a MaxwellSimTree."""
-		
-		return ntree.bl_idname == types.TreeType.MaxwellSim

code/blender_maxwell/node_trees/maxwell_sim_nodes/nodes/outputs/__init__.py

@@ -0,0 +1,8 @@
+from . import exporters
+
+BL_REGISTER = [
+	*exporters.BL_REGISTER,
+]
+BL_NODES = {
+	**exporters.BL_NODES,
+}

code/blender_maxwell/node_trees/maxwell_sim_nodes/nodes/outputs/exporters/__init__.py

@@ -0,0 +1,8 @@
+from . import json_file_exporter
+
+BL_REGISTER = [
+	*json_file_exporter.BL_REGISTER,
+]
+BL_NODES = {
+	**json_file_exporter.BL_NODES,
+}

code/blender_maxwell/node_trees/maxwell_sim_nodes/nodes/outputs/exporters/json_file_exporter.py

@@ -0,0 +1,111 @@
+import typing as typ
+import json
+from pathlib import Path
+
+import bpy
+import sympy as sp
+import pydantic as pyd
+
+from .... import contracts
+from .... import sockets
+from ... import base
+
+####################
+# - Operators
+####################
+class JSONFileExporterPrintJSON(bpy.types.Operator):
+	bl_idname = "blender_maxwell.json_file_exporter_print_json"
+	bl_label = "Print the JSON of what's linked into a JSONFileExporterNode."
+
+	@classmethod
+	def poll(cls, context):
+		return True
+
+	def execute(self, context):
+		node = context.node
+		print(node.linked_data_as_json())
+		return {'FINISHED'}
+
+class JSONFileExporterSaveJSON(bpy.types.Operator):
+	bl_idname = "blender_maxwell.json_file_exporter_save_json"
+	bl_label = "Save the JSON of what's linked into a JSONFileExporterNode."
+
+	@classmethod
+	def poll(cls, context):
+		return True
+
+	def execute(self, context):
+		node = context.node
+		node.export_data_as_json()
+		return {'FINISHED'}
+
+####################
+# - Node
+####################
+class JSONFileExporterNode(base.MaxwellSimTreeNode):
+	node_type = contracts.NodeType.JSONFileExporter
+	
+	bl_label = "JSON File Exporter"
+	#bl_icon = constants.ICON_SIM_INPUT
+	
+	input_sockets = {
+		"json_path": sockets.FilePathSocketDef(
+			label="JSON Path",
+			default_path="simulation.json"
+		),
+		"data": sockets.AnySocketDef(
+			label="Data",
+		),
+	}
+	output_sockets = {}
+	
+	####################
+	# - UI Layout
+	####################
+	def draw_operators(
+		self,
+		context: bpy.types.Context,
+		layout: bpy.types.UILayout,
+	) -> None:
+		layout.operator(JSONFileExporterPrintJSON.bl_idname, text="Print")
+		layout.operator(JSONFileExporterSaveJSON.bl_idname, text="Save")
+
+	####################
+	# - Methods
+	####################
+	def linked_data_as_json(self) -> str | None:
+		if self.g_input_bl_socket("data").is_linked:
+			data: typ.Any = self.compute_input("data")
+			
+			# Tidy3D Objects: Call .json()
+			if hasattr(data, "json"):
+				return data.json()
+			
+			# Pydantic Models: Call .model_dump_json()
+			elif isinstance(data, pyd.BaseModel):
+				return data.model_dump_json()
+			
+			# Finally: Try json.dumps (might fail)
+			else:
+				json.dumps(data)
+	
+	def export_data_as_json(self) -> None:
+		if (data := self.linked_data_as_json()):
+			data_dict = json.loads(data)
+			with self.compute_input("json_path").open("w") as f:
+				json.dump(data_dict, f, ensure_ascii=False, indent=4)
+
+
+####################
+# - Blender Registration
+####################
+BL_REGISTER = [
+	JSONFileExporterPrintJSON,
+	JSONFileExporterNode,
+	JSONFileExporterSaveJSON,
+]
+BL_NODES = {
+	contracts.NodeType.JSONFileExporter: (
+		contracts.NodeCategory.MAXWELL_SIM_OUTPUTS_EXPORTERS
+	)
+}

code/blender_maxwell/node_trees/maxwell_sim_nodes/nodes/simulations/__init__.py

@@ -0,0 +1,8 @@
+from . import fdtd_simulation
+
+BL_REGISTER = [
+	*fdtd_simulation.BL_REGISTER,
+]
+BL_NODES = {
+	**fdtd_simulation.BL_NODES,
+}

code/blender_maxwell/node_trees/maxwell_sim_nodes/nodes/simulations/fdtd_simulation.py

@@ -0,0 +1,92 @@
+import tidy3d as td
+import sympy as sp
+import sympy.physics.units as spu
+
+from ... import contracts
+from ... import sockets
+from .. import base
+
+class FDTDSimNode(base.MaxwellSimTreeNode):
+	node_type = contracts.NodeType.FDTDSim
+	
+	bl_label = "FDTD Simulation"
+	#bl_icon = ...
+	
+	####################
+	# - Sockets
+	####################
+	input_sockets = {
+		"run_time": sockets.RealNumberSocketDef(
+			label="Run Time",
+			default_value=1.0,
+		),
+		"size_x": sockets.RealNumberSocketDef(
+			label="Size X",
+			default_value=1.0,
+		),
+		"size_y": sockets.RealNumberSocketDef(
+			label="Size Y",
+			default_value=1.0,
+		),
+		"size_z": sockets.RealNumberSocketDef(
+			label="Size Z",
+			default_value=1.0,
+		),
+		"ambient_medium": sockets.MaxwellMediumSocketDef(
+			label="Ambient Medium",
+		),
+		"source": sockets.MaxwellSourceSocketDef(
+			label="Source",
+		),
+		"structure": sockets.MaxwellStructureSocketDef(
+			label="Structure",
+		),
+		"bound": sockets.MaxwellBoundSocketDef(
+			label="Bound",
+		),
+	}
+	output_sockets = {
+		"fdtd_sim": sockets.MaxwellFDTDSimSocketDef(
+			label="Medium",
+		),
+	}
+	
+	####################
+	# - Output Socket Computation
+	####################
+	@base.computes_output_socket("fdtd_sim", td.Sellmeier)
+	def compute_simulation(self: contracts.NodeTypeProtocol) -> td.Simulation:
+		run_time = self.compute_input("run_time")
+		ambient_medium = self.compute_input("ambient_medium")
+		structures = [self.compute_input("structure")]
+		sources = [self.compute_input("source")]
+		bound = self.compute_input("bound")
+		
+		size = (
+			self.compute_input("size_x"),
+			self.compute_input("size_y"),
+			self.compute_input("size_z"),
+		)
+		
+		return td.Simulation(
+			size=size,
+			medium=ambient_medium,
+			structures=structures,
+			sources=sources,
+			boundary_spec=bound,
+			run_time=run_time,
+		)
+
+
+
+####################
+# - Blender Registration
+####################
+BL_REGISTER = [
+	FDTDSimNode,
+]
+BL_NODES = {
+	contracts.NodeType.FDTDSim: (
+		contracts.NodeCategory.MAXWELL_SIM_SIMULATIONS
+	)
+}

code/blender_maxwell/node_trees/maxwell_sim_nodes/nodes/sources/__init__.py

@@ -0,0 +1,8 @@
+from . import modelled
+
+BL_REGISTER = [
+	*modelled.BL_REGISTER,
+]
+BL_NODES = {
+	**modelled.BL_NODES,
+}

code/blender_maxwell/node_trees/maxwell_sim_nodes/nodes/sources/modelled/__init__.py

@@ -0,0 +1,8 @@
+from . import point_dipole_source
+
+BL_REGISTER = [
+	*point_dipole_source.BL_REGISTER,
+]
+BL_NODES = {
+	**point_dipole_source.BL_NODES,
+}

code/blender_maxwell/node_trees/maxwell_sim_nodes/nodes/sources/modelled/point_dipole_source.py

@@ -0,0 +1,70 @@
+import tidy3d as td
+import sympy as sp
+import sympy.physics.units as spu
+
+from .... import contracts
+from .... import sockets
+from ... import base
+
+class PointDipoleSourceNode(base.MaxwellSimTreeNode):
+	node_type = contracts.NodeType.PointDipoleSource
+	
+	bl_label = "Point Dipole Source"
+	#bl_icon = ...
+	
+	####################
+	# - Sockets
+	####################
+	input_sockets = {
+		"center_x": sockets.RealNumberSocketDef(
+			label="Center X",
+			default_value=0.0,
+		),
+		"center_y": sockets.RealNumberSocketDef(
+			label="Center Y",
+			default_value=0.0,
+		),
+		"center_z": sockets.RealNumberSocketDef(
+			label="Center Z",
+			default_value=0.0,
+		),
+	}
+	output_sockets = {
+		"source": sockets.MaxwellSourceSocketDef(
+			label="Source",
+		),
+	}
+	
+	####################
+	# - Output Socket Computation
+	####################
+	@base.computes_output_socket("source", td.PointDipole)
+	def compute_source(self: contracts.NodeTypeProtocol) -> td.PointDipole:
+		center = (
+			self.compute_input("center_x"),
+			self.compute_input("center_y"),
+			self.compute_input("center_z"),
+		)
+		
+		cheating_pulse = td.GaussianPulse(freq0=200e12, fwidth=20e12)
+		
+		return td.PointDipole(
+			center=center,
+			source_time=cheating_pulse,
+			interpolate=True,
+			polarization="Ex",
+		)
+
+
+
+####################
+# - Blender Registration
+####################
+BL_REGISTER = [
+	PointDipoleSourceNode,
+]
+BL_NODES = {
+	contracts.NodeType.PointDipoleSource: (
+		contracts.NodeCategory.MAXWELL_SIM_SOURCES_MODELLED
+	)
+}

code/blender_maxwell/node_trees/maxwell_sim_nodes/nodes/structures/__init__.py

@@ -0,0 +1,8 @@
+from . import primitives
+
+BL_REGISTER = [
+	*primitives.BL_REGISTER,
+]
+BL_NODES = {
+	**primitives.BL_NODES,
+}

code/blender_maxwell/node_trees/maxwell_sim_nodes/nodes/structures/primitives/__init__.py

@@ -0,0 +1,8 @@
+from . import box_structure
+
+BL_REGISTER = [
+	*box_structure.BL_REGISTER,
+]
+BL_NODES = {
+	**box_structure.BL_NODES,
+}

code/blender_maxwell/node_trees/maxwell_sim_nodes/nodes/structures/primitives/box_structure.py

@@ -0,0 +1,90 @@
+import tidy3d as td
+import sympy as sp
+import sympy.physics.units as spu
+
+from .... import contracts
+from .... import sockets
+from ... import base
+
+class BoxStructureNode(base.MaxwellSimTreeNode):
+	node_type = contracts.NodeType.BoxStructure
+	
+	bl_label = "Box Structure"
+	#bl_icon = ...
+	
+	####################
+	# - Sockets
+	####################
+	input_sockets = {
+		"medium": sockets.MaxwellMediumSocketDef(
+			label="Medium",
+		),
+		"center_x": sockets.RealNumberSocketDef(
+			label="Center X",
+			default_value=0.0,
+		),
+		"center_y": sockets.RealNumberSocketDef(
+			label="Center Y",
+			default_value=0.0,
+		),
+		"center_z": sockets.RealNumberSocketDef(
+			label="Center Z",
+			default_value=0.0,
+		),
+		"size_x": sockets.RealNumberSocketDef(
+			label="Size X",
+			default_value=1.0,
+		),
+		"size_y": sockets.RealNumberSocketDef(
+			label="Size Y",
+			default_value=1.0,
+		),
+		"size_z": sockets.RealNumberSocketDef(
+			label="Size Z",
+			default_value=1.0,
+		),
+	}
+	output_sockets = {
+		"structure": sockets.MaxwellStructureSocketDef(
+			label="Structure",
+		),
+	}
+	
+	####################
+	# - Output Socket Computation
+	####################
+	@base.computes_output_socket("structure", td.Box)
+	def compute_simulation(self: contracts.NodeTypeProtocol) -> td.Box:
+		medium = self.compute_input("medium")
+		center = (
+			self.compute_input("center_x"),
+			self.compute_input("center_y"),
+			self.compute_input("center_z"),
+		)
+		size = (
+			self.compute_input("size_x"),
+			self.compute_input("size_y"),
+			self.compute_input("size_z"),
+		)
+		
+		return td.Structure(
+			geometry=td.Box(
+				center=center,
+				size=size,
+			),
+			medium=medium,
+		)
+
+
+
+####################
+# - Blender Registration
+####################
+BL_REGISTER = [
+	BoxStructureNode,
+]
+BL_NODES = {
+	contracts.NodeType.BoxStructure: (
+		contracts.NodeCategory.MAXWELL_SIM_STRUCTURES_PRIMITIES
+	)
+}

code/blender_maxwell/node_trees/maxwell_sim_nodes/socket_types.py

@@ -1,72 +0,0 @@
-import bpy
-
-from . import constants, types
-
-class MaxwellSourceSocket(bpy.types.NodeSocket):
-	bl_idname = types.SocketType.MaxwellSource
-	bl_label = "Maxwell Source"
-
-	def draw(self, context, layout, node, text):
-		layout.label(text=text)
-	
-	@classmethod
-	def draw_color_simple(cls):
-		return constants.COLOR_SOCKET_SOURCE
-
-
-class MaxwellMediumSocket(bpy.types.NodeSocket):
-	bl_idname = types.SocketType.MaxwellMedium
-	bl_label = "Maxwell Medium"
-
-	def draw(self, context, layout, node, text):
-		layout.label(text=text)
-	
-	@classmethod
-	def draw_color_simple(cls):
-		return constants.COLOR_SOCKET_MEDIUM
-
-class MaxwellStructureSocket(bpy.types.NodeSocket):
-	bl_idname = types.SocketType.MaxwellStructure
-	bl_label = "Maxwell Structure"
-	
-	def draw(self, context, layout, node, text):
-		layout.label(text=text)
-	
-	@classmethod
-	def draw_color_simple(cls):
-		return constants.COLOR_SOCKET_STRUCTURE
-
-class MaxwellBoundSocket(bpy.types.NodeSocket):
-	bl_idname = types.SocketType.MaxwellBound
-	bl_label = "Maxwell Bound"
-	
-	def draw(self, context, layout, node, text):
-		layout.label(text=text)
-	
-	@classmethod
-	def draw_color_simple(cls):
-		return constants.COLOR_SOCKET_BOUND
-
-class MaxwellFDTDSimSocket(bpy.types.NodeSocket):
-	bl_idname = types.SocketType.MaxwellFDTDSim
-	bl_label = "Maxwell FDTD Simulation"
-	
-	def draw(self, context, layout, node, text):
-		layout.label(text=text)
-	
-	@classmethod
-	def draw_color_simple(cls):
-		return constants.COLOR_SOCKET_FDTDSIM
-
-
-
-####################
-# - Blender Registration
-####################
-BL_REGISTER = [
-	MaxwellSourceSocket,
-	MaxwellMediumSocket,
-	MaxwellStructureSocket,
-	MaxwellBoundSocket,
-	MaxwellFDTDSimSocket,
-]

code/blender_maxwell/node_trees/maxwell_sim_nodes/sockets/__init__.py

@@ -0,0 +1,25 @@
+from . import basic
+AnySocketDef = basic.AnySocketDef
+TextSocketDef = basic.TextSocketDef
+FilePathSocketDef = basic.FilePathSocketDef
+
+from . import number
+RealNumberSocketDef = number.RealNumberSocketDef
+ComplexNumberSocketDef = number.ComplexNumberSocketDef
+
+from . import physical
+PhysicalAreaSocketDef = physical.PhysicalAreaSocketDef
+
+from . import maxwell
+MaxwellBoundSocketDef = maxwell.MaxwellBoundSocketDef
+MaxwellFDTDSimSocketDef = maxwell.MaxwellFDTDSimSocketDef
+MaxwellMediumSocketDef = maxwell.MaxwellMediumSocketDef
+MaxwellSourceSocketDef = maxwell.MaxwellSourceSocketDef
+MaxwellStructureSocketDef = maxwell.MaxwellStructureSocketDef
+
+BL_REGISTER = [
+	*basic.BL_REGISTER,
+	*number.BL_REGISTER,
+	*physical.BL_REGISTER,
+	*maxwell.BL_REGISTER,
+]

code/blender_maxwell/node_trees/maxwell_sim_nodes/sockets/base.py

@@ -0,0 +1,105 @@
+import typing as typ
+import bpy
+
+from .. import contracts
+
+class BLSocket(bpy.types.NodeSocket):
+	"""A base type for nodes that greatly simplifies the implementation of
+	reliable, powerful nodes.
+	
+	Should be used together with `contracts.BLSocketProtocol`.
+	"""
+	def __init_subclass__(cls, **kwargs: typ.Any):
+		super().__init_subclass__(**kwargs)  ## Yucky superclass setup.
+		
+		# Set bl_idname
+		cls.bl_idname = cls.socket_type.value 
+		
+		# Declare Node Property: 'preset' EnumProperty
+		if hasattr(cls, "draw_preview"):
+			cls.__annotations__["preview_active"] = bpy.props.BoolProperty(
+				name="Preview",
+				description="Preview the socket value",
+				default=False,
+			)
+	
+	####################
+	# - Methods
+	####################
+	def is_compatible(self, value: typ.Any) -> bool:
+		for compatible_type, checks in self.compatible_types.items():
+			if (
+				compatible_type is typ.Any or
+				isinstance(value, compatible_type)
+			):
+				return all(check(value) for check in checks)
+		
+		return False
+	
+	####################
+	# - UI
+	####################
+	@classmethod
+	def draw_color_simple(cls) -> contracts.BlenderColorRGB:
+		return cls.socket_color
+	
+	def draw(
+		self,
+		context: bpy.types.Context,
+		layout: bpy.types.UILayout,
+		node: bpy.types.Node,
+		text: str,
+	) -> None:
+		if self.is_output:
+			self.draw_output(context, layout, node, text)
+		else:
+			self.draw_input(context, layout, node, text)
+	
+	def draw_input(
+		self,
+		context: bpy.types.Context,
+		layout: bpy.types.UILayout,
+		node: bpy.types.Node,
+		text: str,
+	) -> None:
+		if self.is_linked:
+			layout.label(text=text)
+			return
+		
+		# Column
+		col = layout.column(align=True)
+		
+		# Row: Label & Preview Toggle
+		label_col_row = col.row(align=True)
+		if hasattr(self, "draw_label_row"):
+			self.draw_label_row(label_col_row, text)
+		else:
+			label_col_row.label(text=text)
+		
+		if hasattr(self, "draw_preview"):
+			label_col_row.prop(
+				self,
+				"preview_active",
+				toggle=True,
+				text="",
+				icon="SEQ_PREVIEW",
+			)
+		
+		# Row: Preview (in Box)
+		if hasattr(self, "draw_preview"):
+			if self.preview_active:
+				col_box = col.box()
+				self.draw_preview(col_box)
+		
+		# Row(s): Value
+		if hasattr(self, "draw_value"):
+			self.draw_value(col)
+	
+	def draw_output(
+		self,
+		context: bpy.types.Context,
+		layout: bpy.types.UILayout,
+		node: bpy.types.Node,
+		text: str,
+	) -> None:
+		layout.label(text=text)

code/blender_maxwell/node_trees/maxwell_sim_nodes/sockets/basic/__init__.py

@@ -0,0 +1,15 @@
+from . import any_socket
+AnySocketDef = any_socket.AnySocketDef
+
+from . import text_socket
+TextSocketDef = text_socket.TextSocketDef
+
+from . import file_path_socket
+FilePathSocketDef = file_path_socket.FilePathSocketDef
+
+
+BL_REGISTER = [
+	*any_socket.BL_REGISTER,
+	*text_socket.BL_REGISTER,
+	*file_path_socket.BL_REGISTER,
+]

code/blender_maxwell/node_trees/maxwell_sim_nodes/sockets/basic/any_socket.py

@@ -0,0 +1,57 @@
+import typing as typ
+
+import bpy
+import sympy as sp
+import pydantic as pyd
+
+from .. import base
+from ... import contracts
+
+####################
+# - Blender Socket
+####################
+class AnyBLSocket(base.BLSocket):
+	socket_type = contracts.SocketType.Any
+	socket_color = (0.0, 0.0, 0.0, 1.0)
+	
+	bl_label = "Any"
+	
+	compatible_types = {
+		typ.Any: {},
+	}
+	
+	####################
+	# - Socket UI
+	####################
+	def draw_label_row(self, label_col_row: bpy.types.UILayout, text: str) -> None:
+		"""Draw the value of the real number.
+		"""
+		label_col_row.label(text=text)
+	
+	####################
+	# - Computation of Default Value
+	####################
+	@property
+	def default_value(self) -> None:
+		return None
+	
+	@default_value.setter
+	def default_value(self, value: typ.Any) -> None:
+		pass
+
+####################
+# - Socket Configuration
+####################
+class AnySocketDef(pyd.BaseModel):
+	socket_type: contracts.SocketType = contracts.SocketType.Any
+	label: str
+	
+	def init(self, bl_socket: AnyBLSocket) -> None:
+		pass
+
+####################
+# - Blender Registration
+####################
+BL_REGISTER = [
+	AnyBLSocket,
+]

code/blender_maxwell/node_trees/maxwell_sim_nodes/sockets/basic/file_path_socket.py

@@ -0,0 +1,84 @@
+import typing as typ
+from pathlib import Path
+
+import bpy
+import sympy as sp
+import pydantic as pyd
+
+from .. import base
+from ... import contracts
+
+####################
+# - Blender Socket
+####################
+class FilePathBLSocket(base.BLSocket):
+	socket_type = contracts.SocketType.FilePath
+	socket_color = (0.2, 0.2, 0.2, 1.0)
+	
+	bl_label = "File Path"
+	
+	compatible_types = {
+		Path: {},
+	}
+	
+	####################
+	# - Properties
+	####################
+	raw_value: bpy.props.StringProperty(
+		name="File Path",
+		description="Represents the path to a file",
+		#default="",
+		subtype="FILE_PATH",
+	)
+	
+	####################
+	# - Socket UI
+	####################
+	def draw_value(self, col: bpy.types.UILayout) -> None:
+		col_row = col.row(align=True)
+		col_row.prop(self, "raw_value", text="")
+	
+	####################
+	# - Computation of Default Value
+	####################
+	@property
+	def default_value(self) -> Path:
+		"""Return the text.
+		
+		Returns:
+			The text as a string.
+		"""
+		
+		return Path(str(self.raw_value))
+	
+	@default_value.setter
+	def default_value(self, value: typ.Any) -> None:
+		"""Set the real number from some compatible type, namely
+		real sympy expressions with no symbols, or floats.
+		"""
+		
+		# (Guard) Value Compatibility
+		if not self.is_compatible(value):
+			msg = f"Tried setting socket ({self}) to incompatible value ({value}) of type {type(value)}"
+			raise ValueError(msg)
+		
+		self.raw_value = str(Path(value))
+
+####################
+# - Socket Configuration
+####################
+class FilePathSocketDef(pyd.BaseModel):
+	socket_type: contracts.SocketType = contracts.SocketType.FilePath
+	label: str
+	
+	default_path: Path
+	
+	def init(self, bl_socket: FilePathBLSocket) -> None:
+		bl_socket.default_value = self.default_path
+
+####################
+# - Blender Registration
+####################
+BL_REGISTER = [
+	FilePathBLSocket,
+]

code/blender_maxwell/node_trees/maxwell_sim_nodes/sockets/basic/text_socket.py

@@ -0,0 +1,81 @@
+import typing as typ
+
+import bpy
+import sympy as sp
+import pydantic as pyd
+
+from .. import base
+from ... import contracts
+
+####################
+# - Blender Socket
+####################
+class TextBLSocket(base.BLSocket):
+	socket_type = contracts.SocketType.Text
+	socket_color = (0.2, 0.2, 0.2, 1.0)
+	
+	bl_label = "Text"
+	
+	compatible_types = {
+		str: {},
+	}
+	
+	####################
+	# - Properties
+	####################
+	raw_value: bpy.props.StringProperty(
+		name="Text",
+		description="Represents some text",
+		default="",
+	)
+	
+	####################
+	# - Socket UI
+	####################
+	def draw_label_row(self, label_col_row: bpy.types.UILayout, text: str) -> None:
+		"""Draw the value of the real number.
+		"""
+		label_col_row.prop(self, "raw_value", text=text)
+	
+	####################
+	# - Computation of Default Value
+	####################
+	@property
+	def default_value(self) -> str:
+		"""Return the text.
+		
+		Returns:
+			The text as a string.
+		"""
+		
+		return self.raw_value
+	
+	@default_value.setter
+	def default_value(self, value: typ.Any) -> None:
+		"""Set the real number from some compatible type, namely
+		real sympy expressions with no symbols, or floats.
+		"""
+		
+		# (Guard) Value Compatibility
+		if not self.is_compatible(value):
+			msg = f"Tried setting socket ({self}) to incompatible value ({value}) of type {type(value)}"
+			raise ValueError(msg)
+		
+		self.raw_value = str(value)
+
+####################
+# - Socket Configuration
+####################
+class TextSocketDef(pyd.BaseModel):
+	socket_type: contracts.SocketType = contracts.SocketType.Text
+	label: str
+	
+	def init(self, bl_socket: TextBLSocket) -> None:
+		pass
+
+####################
+# - Blender Registration
+####################
+BL_REGISTER = [
+	TextBLSocket,
+]

code/blender_maxwell/node_trees/maxwell_sim_nodes/sockets/maxwell/__init__.py

@@ -0,0 +1,23 @@
+from . import maxwell_bound_socket
+MaxwellBoundSocketDef = maxwell_bound_socket.MaxwellBoundSocketDef
+
+from . import maxwell_fdtd_sim_socket
+MaxwellFDTDSimSocketDef = maxwell_fdtd_sim_socket.MaxwellFDTDSimSocketDef
+
+from . import maxwell_medium_socket
+MaxwellMediumSocketDef = maxwell_medium_socket.MaxwellMediumSocketDef
+
+from . import maxwell_source_socket
+MaxwellSourceSocketDef = maxwell_source_socket.MaxwellSourceSocketDef
+
+from . import maxwell_structure_socket
+MaxwellStructureSocketDef = maxwell_structure_socket.MaxwellStructureSocketDef
+
+
+BL_REGISTER = [
+	*maxwell_bound_socket.BL_REGISTER,
+	*maxwell_fdtd_sim_socket.BL_REGISTER,
+	*maxwell_medium_socket.BL_REGISTER,
+	*maxwell_source_socket.BL_REGISTER,
+	*maxwell_structure_socket.BL_REGISTER,
+]

code/blender_maxwell/node_trees/maxwell_sim_nodes/sockets/maxwell/maxwell_bound_socket.py

@@ -0,0 +1,46 @@
+import typing as typ
+
+import bpy
+import pydantic as pyd
+import tidy3d as td
+
+from .. import base
+from ... import contracts
+
+class MaxwellBoundBLSocket(base.BLSocket):
+	socket_type = contracts.SocketType.MaxwellBound
+	socket_color = (0.8, 0.8, 0.4, 1.0)
+	
+	bl_label = "Maxwell Bound"
+	
+	compatible_types = {
+		td.BoundarySpec: {}
+	}
+	
+	####################
+	# - Computation of Default Value
+	####################
+	@property
+	def default_value(self) -> td.BoundarySpec:
+		return td.BoundarySpec()
+	
+	@default_value.setter
+	def default_value(self, value: typ.Any) -> None:
+		return None
+
+####################
+# - Socket Configuration
+####################
+class MaxwellBoundSocketDef(pyd.BaseModel):
+	socket_type: contracts.SocketType = contracts.SocketType.MaxwellBound
+	label: str
+	
+	def init(self, bl_socket: MaxwellBoundBLSocket) -> None:
+		pass
+
+####################
+# - Blender Registration
+####################
+BL_REGISTER = [
+	MaxwellBoundBLSocket,
+]

code/blender_maxwell/node_trees/maxwell_sim_nodes/sockets/maxwell/maxwell_fdtd_sim_socket.py

@@ -0,0 +1,46 @@
+import typing as typ
+
+import bpy
+import pydantic as pyd
+import tidy3d as td
+
+from .. import base
+from ... import contracts
+
+class MaxwellFDTDSimBLSocket(base.BLSocket):
+	socket_type = contracts.SocketType.MaxwellFDTDSim
+	socket_color = (0.8, 0.8, 0.4, 1.0)
+	
+	bl_label = "Maxwell Source"
+	
+	compatible_types = {
+		td.Simulation: {},
+	}
+	
+	####################
+	# - Computation of Default Value
+	####################
+	@property
+	def default_value(self) -> None:
+		return None
+	
+	@default_value.setter
+	def default_value(self, value: typ.Any) -> None:
+		pass
+
+####################
+# - Socket Configuration
+####################
+class MaxwellFDTDSimSocketDef(pyd.BaseModel):
+	socket_type: contracts.SocketType = contracts.SocketType.MaxwellFDTDSim
+	label: str
+	
+	def init(self, bl_socket: MaxwellFDTDSimBLSocket) -> None:
+		pass
+
+####################
+# - Blender Registration
+####################
+BL_REGISTER = [
+	MaxwellFDTDSimBLSocket,
+]

code/blender_maxwell/node_trees/maxwell_sim_nodes/sockets/maxwell/maxwell_medium_socket.py

@@ -0,0 +1,89 @@
+import typing as typ
+
+import bpy
+import pydantic as pyd
+import tidy3d as td
+
+from .. import base
+from ... import contracts
+
+class MaxwellMediumBLSocket(base.BLSocket):
+	socket_type = contracts.SocketType.MaxwellMedium
+	socket_color = (0.8, 0.8, 0.4, 1.0)
+	
+	bl_label = "Maxwell Medium"
+	
+	compatible_types = {
+		td.components.medium.AbstractMedium: {}
+	}
+	
+	####################
+	# - Properties
+	####################
+	rel_permittivity: bpy.props.FloatProperty(
+		name="Permittivity",
+		description="Represents a simple, real permittivity.",
+		default=0.0,
+		precision=6,
+	)
+	
+	####################
+	# - Socket UI
+	####################
+	def draw_value(self, col: bpy.types.UILayout) -> None:
+		"""Draw the value of the area, including a toggle for
+		specifying the active unit.
+		"""
+		col_row = col.row(align=True)
+		col_row.prop(self, "rel_permittivity", text="Re(eps_r)")
+	
+	####################
+	# - Computation of Default Value
+	####################
+	@property
+	def default_value(self) -> td.Medium:
+		"""Return the built-in medium representation as a `tidy3d` object,
+		ready to use in the simulation.
+		
+		Returns:
+			A completely normal medium with permittivity set.
+		"""
+		
+		return td.Medium(
+			permittivity=self.rel_permittivity,
+		)
+	
+	@default_value.setter
+	def default_value(self, value: typ.Any) -> None:
+		"""Set the built-in medium representation by adjusting the
+		permittivity, ONLY.
+		
+		Args:
+			value: Must be a tidy3d.Medium, or similar subclass.
+		"""
+		
+		# ONLY Allow td.Medium
+		if isinstance(value, td.Medium):
+			self.rel_permittivity = value.permittivity
+		
+		msg = f"Tried setting MaxwellMedium socket ({self}) to something that isn't a simple `tidy3d.Medium`"
+		raise ValueError(msg)
+
+####################
+# - Socket Configuration
+####################
+class MaxwellMediumSocketDef(pyd.BaseModel):
+	socket_type: contracts.SocketType = contracts.SocketType.MaxwellMedium
+	label: str
+	
+	rel_permittivity: float = 1.0
+	
+	def init(self, bl_socket: MaxwellMediumBLSocket) -> None:
+		bl_socket.rel_permittivity = self.rel_permittivity
+
+####################
+# - Blender Registration
+####################
+BL_REGISTER = [
+	MaxwellMediumBLSocket,
+]

code/blender_maxwell/node_trees/maxwell_sim_nodes/sockets/maxwell/maxwell_source_socket.py

@@ -0,0 +1,46 @@
+import typing as typ
+
+import bpy
+import pydantic as pyd
+import tidy3d as td
+
+from .. import base
+from ... import contracts
+
+class MaxwellSourceBLSocket(base.BLSocket):
+	socket_type = contracts.SocketType.MaxwellSource
+	socket_color = (0.8, 0.8, 0.4, 1.0)
+	
+	bl_label = "Maxwell Source"
+	
+	compatible_types = {
+		td.components.base_sim.source.AbstractSource: {}
+	}
+	
+	####################
+	# - Computation of Default Value
+	####################
+	@property
+	def default_value(self) -> td.Medium:
+		return None
+	
+	@default_value.setter
+	def default_value(self, value: typ.Any) -> None:
+		pass
+
+####################
+# - Socket Configuration
+####################
+class MaxwellSourceSocketDef(pyd.BaseModel):
+	socket_type: contracts.SocketType = contracts.SocketType.MaxwellSource
+	label: str
+	
+	def init(self, bl_socket: MaxwellSourceBLSocket) -> None:
+		pass
+
+####################
+# - Blender Registration
+####################
+BL_REGISTER = [
+	MaxwellSourceBLSocket,
+]

code/blender_maxwell/node_trees/maxwell_sim_nodes/sockets/maxwell/maxwell_structure_socket.py

@@ -0,0 +1,46 @@
+import typing as typ
+
+import bpy
+import pydantic as pyd
+import tidy3d as td
+
+from .. import base
+from ... import contracts
+
+class MaxwellStructureBLSocket(base.BLSocket):
+	socket_type = contracts.SocketType.MaxwellStructure
+	socket_color = (0.8, 0.8, 0.4, 1.0)
+	
+	bl_label = "Maxwell Structure"
+	
+	compatible_types = {
+		td.components.structure.AbstractStructure: {}
+	}
+	
+	####################
+	# - Computation of Default Value
+	####################
+	@property
+	def default_value(self) -> None:
+		return None
+	
+	@default_value.setter
+	def default_value(self, value: typ.Any) -> None:
+		pass
+
+####################
+# - Socket Configuration
+####################
+class MaxwellStructureSocketDef(pyd.BaseModel):
+	socket_type: contracts.SocketType = contracts.SocketType.MaxwellStructure
+	label: str
+	
+	def init(self, bl_socket: MaxwellStructureBLSocket) -> None:
+		pass
+
+####################
+# - Blender Registration
+####################
+BL_REGISTER = [
+	MaxwellStructureBLSocket,
+]

code/blender_maxwell/node_trees/maxwell_sim_nodes/sockets/number/__init__.py

@@ -0,0 +1,11 @@
+from . import real_number_socket
+RealNumberSocketDef = real_number_socket.RealNumberSocketDef
+
+from . import complex_number_socket
+ComplexNumberSocketDef = complex_number_socket.ComplexNumberSocketDef
+
+
+BL_REGISTER = [
+	*real_number_socket.BL_REGISTER,
+	*complex_number_socket.BL_REGISTER,
+]

code/blender_maxwell/node_trees/maxwell_sim_nodes/sockets/number/complex_number_socket.py

@@ -0,0 +1,160 @@
+import typing as typ
+
+import bpy
+import sympy as sp
+import pydantic as pyd
+
+from .. import base
+from ... import contracts
+
+####################
+# - Blender Socket
+####################
+class ComplexNumberBLSocket(base.BLSocket):
+	socket_type = contracts.SocketType.ComplexNumber
+	socket_color = (0.6, 0.6, 0.6, 1.0)
+	
+	bl_label = "Complex Number"
+	
+	compatible_types = {
+		complex: {},
+		sp.Expr: {
+			lambda v: v.is_complex,
+			lambda v: len(v.free_symbols) == 0,
+		},
+	}
+	
+	####################
+	# - Properties
+	####################
+	raw_value: bpy.props.FloatVectorProperty(
+		name="Complex Number",
+		description="Represents a complex number (real, imaginary)",
+		size=2,
+		default=(0.0, 0.0),
+		subtype='NONE'
+	)
+	coord_sys: bpy.props.EnumProperty(
+		name="Coordinate System",
+		description="Choose between cartesian and polar form",
+		items=[
+			("CARTESIAN", "Cartesian", "Use Cartesian Coordinates", "EMPTY_AXIS", 0),
+			("POLAR", "Polar", "Use Polar Coordinates", "DRIVER_ROTATIONAL_DIFFERENCE", 1),
+		],
+		default="CARTESIAN",
+		update=lambda self, context: self._update_coord_sys(),
+	)
+	
+	####################
+	# - Socket UI
+	####################
+	def draw_value(self, col: bpy.types.UILayout) -> None:
+		"""Draw the value of the complex number, including a toggle for
+		specifying the active coordinate system.
+		"""
+		col_row = col.row()
+		col_row.prop(self, "raw_value", text="")
+		col.prop(self, "coord_sys", text="")
+	
+	def draw_preview(self, col_box: bpy.types.UILayout) -> None:
+		"""Draw a live-preview value for the complex number, into the
+		given preview box.
+		
+		- Cartesian: a,b -> a + ib
+		- Polar: r,t -> re^(it)
+		
+		Returns:
+			The sympy expression representing the complex number.
+		"""
+		if self.coord_sys == "CARTESIAN":
+			text = f"= {self.default_value.n(2)}"
+		
+		elif self.coord_sys == "POLAR":
+			r = sp.Abs(self.default_value).n(2)
+			theta_rad = sp.arg(self.default_value).n(2)
+			text = f"= {r*sp.exp(sp.I*theta_rad)}"
+		
+		else:
+			raise RuntimeError("Invalid coordinate system for complex number")
+			
+		col_box.label(text=text)
+	
+	####################
+	# - Computation of Default Value
+	####################
+	@property
+	def default_value(self) -> sp.Expr:
+		"""Return the complex number as a sympy expression, of a form
+		determined by the coordinate system.
+		
+		- Cartesian: a,b -> a + ib
+		- Polar: r,t -> re^(it)
+		
+		Returns:
+			The sympy expression representing the complex number.
+		"""
+		
+		v1, v2 = self.raw_value
+		
+		return {
+			"CARTESIAN": v1 + sp.I*v2,
+			"POLAR": v1 * sp.exp(sp.I*v2),
+		}[self.coord_sys]
+	
+	@default_value.setter
+	def default_value(self, value: typ.Any) -> None:
+		"""Set the complex number from a sympy expression, using an internal
+		representation determined by the coordinate system.
+		
+		- Cartesian: a,b -> a + ib
+		- Polar: r,t -> re^(it)
+		"""
+		
+		# (Guard) Value Compatibility
+		if not self.is_compatible(value):
+			msg = f"Tried setting socket ({self}) to incompatible value ({value}) of type {type(value)}"
+			raise ValueError(msg)
+		
+		self.raw_value = {
+			"CARTESIAN": (sp.re(value), sp.im(value)),
+			"POLAR": (sp.Abs(value), sp.arg(value)),
+		}[self.coord_sys]
+	
+	####################
+	# - Internal Update Methods
+	####################
+	def _update_coord_sys(self):
+		if self.coord_sys == "CARTESIAN":
+			r, theta_rad = self.raw_value
+			self.raw_value = (
+				r * sp.cos(theta_rad),
+				r * sp.sin(theta_rad),
+			)
+		elif self.coord_sys == "POLAR":
+			x, y = self.raw_value
+			cart_value = x + sp.I*y
+			self.raw_value = (
+				sp.Abs(cart_value),
+				sp.arg(cart_value) if y != 0 else 0,
+			)
+
+####################
+# - Socket Configuration
+####################
+class ComplexNumberSocketDef(pyd.BaseModel):
+	socket_type: contracts.SocketType = contracts.SocketType.ComplexNumber
+	label: str
+	
+	preview: bool = False
+	coord_sys: typ.Literal["CARTESIAN", "POLAR"] = "CARTESIAN"
+	
+	def init(self, bl_socket: ComplexNumberBLSocket) -> None:
+		bl_socket.preview_active = self.preview
+		bl_socket.coord_sys = self.coord_sys
+
+####################
+# - Blender Registration
+####################
+BL_REGISTER = [
+	ComplexNumberBLSocket,
+]

code/blender_maxwell/node_trees/maxwell_sim_nodes/sockets/number/real_number_socket.py

@@ -0,0 +1,88 @@
+import typing as typ
+
+import bpy
+import sympy as sp
+import pydantic as pyd
+
+from .. import base
+from ... import contracts
+
+####################
+# - Blender Socket
+####################
+class RealNumberBLSocket(base.BLSocket):
+	socket_type = contracts.SocketType.RealNumber
+	socket_color = (0.6, 0.6, 0.6, 1.0)
+	
+	bl_label = "Real Number"
+	
+	compatible_types = {
+		float: {},
+		sp.Expr: {
+			lambda v: v.is_real,
+			lambda v: len(v.free_symbols) == 0,
+		},
+	}
+	
+	####################
+	# - Properties
+	####################
+	raw_value: bpy.props.FloatProperty(
+		name="Real Number",
+		description="Represents a real number",
+		default=0.0,
+		precision=6,
+	)
+	
+	####################
+	# - Socket UI
+	####################
+	def draw_label_row(self, label_col_row: bpy.types.UILayout, text: str) -> None:
+		"""Draw the value of the real number.
+		"""
+		label_col_row.prop(self, "raw_value", text=text)
+	
+	####################
+	# - Computation of Default Value
+	####################
+	@property
+	def default_value(self) -> float:
+		"""Return the real number.
+		
+		Returns:
+			The real number as a float.
+		"""
+		
+		return self.raw_value
+	
+	@default_value.setter
+	def default_value(self, value: typ.Any) -> None:
+		"""Set the real number from some compatible type, namely
+		real sympy expressions with no symbols, or floats.
+		"""
+		
+		# (Guard) Value Compatibility
+		if not self.is_compatible(value):
+			msg = f"Tried setting socket ({self}) to incompatible value ({value}) of type {type(value)}"
+			raise ValueError(msg)
+		
+		self.raw_value = float(value)
+
+####################
+# - Socket Configuration
+####################
+class RealNumberSocketDef(pyd.BaseModel):
+	socket_type: contracts.SocketType = contracts.SocketType.RealNumber
+	label: str
+	
+	default_value: float = 0.0
+	
+	def init(self, bl_socket: RealNumberBLSocket) -> None:
+		bl_socket.default_value = self.default_value
+
+####################
+# - Blender Registration
+####################
+BL_REGISTER = [
+	RealNumberBLSocket,
+]

code/blender_maxwell/node_trees/maxwell_sim_nodes/sockets/physical/__init__.py

@@ -0,0 +1,7 @@
+from . import physical_area_socket
+PhysicalAreaSocketDef = physical_area_socket.PhysicalAreaSocketDef
+
+
+BL_REGISTER = [
+	*physical_area_socket.BL_REGISTER,
+]

code/blender_maxwell/node_trees/maxwell_sim_nodes/sockets/physical/physical_area_socket.py

@@ -0,0 +1,147 @@
+import typing as typ
+
+import bpy
+import sympy as sp
+import sympy.physics.units as spu
+import pydantic as pyd
+
+sp.printing.str.StrPrinter._default_settings['abbrev'] = True
+## When we str() a unit expression, use abbrevied units.
+
+from .. import base
+from ... import contracts
+
+UNITS = {
+	"PM_SQ": spu.pm**2,
+	"A_SQ": spu.angstrom**2,
+	"NM_SQ": spu.nm**2,
+	"UM_SQ": spu.um**2,
+	"MM_SQ": spu.mm**2,
+	"CM_SQ": spu.cm**2,
+	"M_SQ": spu.m**2,
+}
+DEFAULT_UNIT = "UM_SQ"
+
+class PhysicalAreaBLSocket(base.BLSocket):
+	socket_type = contracts.SocketType.PhysicalArea
+	socket_color = (0.8, 0.5, 0.5, 1.0)
+	
+	bl_label = "Physical Area"
+	
+	compatible_types = {
+		sp.Expr: {
+			lambda v: v.is_real,
+			lambda v: len(v.free_symbols) == 0,
+			lambda v: any(
+				contracts.is_exactly_expressed_as_unit(v, unit)
+				for unit in UNITS.values()
+			)
+		},
+	}
+	
+	####################
+	# - Properties
+	####################
+	raw_value: bpy.props.FloatProperty(
+		name="Unitless Area",
+		description="Represents the unitless part of the area",
+		default=0.0,
+		precision=6,
+	)
+	unit: bpy.props.EnumProperty(
+		name="Unit",
+		description="Choose between area units",
+		items=[
+			(unit_name, str(unit_value), str(unit_value))
+			for unit_name, unit_value in UNITS.items()
+		],
+		default=DEFAULT_UNIT,
+		update=lambda self, context: self._update_unit(),
+	)
+	unit_previous: bpy.props.StringProperty(default=DEFAULT_UNIT)
+	
+	####################
+	# - Socket UI
+	####################
+	def draw_label_row(self, label_col_row: bpy.types.UILayout, text: str) -> None:
+		"""Draw the value of the area, including a toggle for
+		specifying the active unit.
+		"""
+		label_col_row.label(text=text)
+		#label_col_row.prop(self, "raw_value", text="")
+		label_col_row.prop(self, "unit", text="")
+	
+	def draw_value(self, col: bpy.types.UILayout) -> None:
+		col_row = col.row(align=True)
+		col_row.prop(self, "raw_value", text="")
+		#col_row.prop(self, "unit", text="")
+	
+	####################
+	# - Computation of Default Value
+	####################
+	@property
+	def default_value(self) -> sp.Expr:
+		"""Return the area as a sympy expression, which is a pure real
+		number perfectly expressed as the active unit.
+		
+		Returns:
+			The area as a sympy expression (with units).
+		"""
+		
+		return self.raw_value * UNITS[self.unit]
+	
+	@default_value.setter
+	def default_value(self, value: typ.Any) -> None:
+		"""Set the area from a sympy expression, including any required
+		unit conversions to normalize the input value to the selected
+		units.
+		"""
+		
+		# (Guard) Value Compatibility
+		if not self.is_compatible(value):
+			msg = f"Tried setting socket ({self}) to incompatible value ({value}) of type {type(value)}"
+			raise ValueError(msg)
+		
+		self.raw_value = spu.convert_to(
+			value, UNITS[self.unit]
+		) / UNITS[self.unit]
+	
+	####################
+	# - Internal Update Methods
+	####################
+	def _update_unit(self):
+		old_unit = UNITS[self.unit_previous] 
+		new_unit = UNITS[self.unit]
+		
+		self.raw_value = spu.convert_to(
+			self.raw_value * old_unit,
+			new_unit,
+		) / new_unit
+		self.unit_previous = self.unit
+
+####################
+# - Socket Configuration
+####################
+class PhysicalAreaSocketDef(pyd.BaseModel):
+	socket_type: contracts.SocketType = contracts.SocketType.PhysicalArea
+	label: str
+	
+	default_unit: typ.Literal[
+		"PM_SQ",
+		"A_SQ",
+		"NM_SQ",
+		"UM_SQ",
+		"MM_SQ",
+		"CM_SQ",
+		"M_SQ",
+	]
+	
+	def init(self, bl_socket: PhysicalAreaBLSocket) -> None:
+		bl_socket.unit = self.default_unit
+
+####################
+# - Blender Registration
+####################
+BL_REGISTER = [
+	PhysicalAreaBLSocket,
+]

code/blender_maxwell/node_trees/maxwell_sim_nodes/tree.py

@@ -1,17 +0,0 @@
-import bpy
-
-from . import types, constants
-
-class MaxwellSimTree(bpy.types.NodeTree):
-	bl_idname = types.TreeType.MaxwellSim
-	bl_label = "Maxwell Sim Editor"
-	bl_icon = constants.ICON_SIM	## Icon ID
-
-
-
-####################
-# - Blender Registration
-####################
-BL_REGISTER = [
-	MaxwellSimTree,
-]

code/blender_maxwell/requirements.txt

@@ -1,2 +1,3 @@
 tidy3d==2.5.2
 pydantic==2.6.0
+sympy==1.12

code/run.sh

@@ -2,5 +2,10 @@
 
 blender --python run.py
 if [ $? -eq 42 ]; then
+	echo
+	echo
+	echo
+	echo
+	echo
 	blender --python run.py
 fi

code/test.py

@@ -1,34 +0,0 @@
-import enum
-
-class BlenderTypeEnum(str, enum.Enum):
-	def _generate_next_value_(name, start, count, last_values):
-		return name
-
-
-def blender_type_enum(cls):
-	# Construct Set w/Modified Member Names
-	new_members = {name: f"{name}{cls.__name__}" for name, member in cls.__members__.items()}
-	
-	# Dynamically Declare New Enum Class w/Modified Members
-	new_cls = enum.Enum(cls.__name__, new_members, type=BlenderTypeEnum)
-	new_cls.__module__ = cls.__module__
-	
-	# Return New (Replacing) Enum Class
-	return new_cls
-
-@blender_type_enum
-class TreeType(enum.Enum):
-	MaxwellSim = enum.auto()
-
-@blender_type_enum
-class SocketType(enum.Enum):
-	MaxwellSource = enum.auto()
-	MaxwellMedium = enum.auto()
-	MaxwellStructure = enum.auto()
-	MaxwellBound = enum.auto()
-	MaxwellFDTDSim = enum.auto()
-
-# Demonstration
-print(TreeType.MaxwellSim.value)  # Should print "MaxwellSimTreeType"
-print(SocketType.MaxwellSource.value)  # Should print "MaxwellSourceSocketType"
-