mantis/xForm_nodes.py

from .node_common import *
from .base_definitions import MantisNode, NodeSocket
from .xForm_socket_templates import *
from .mantis_dataclasses import xForm_info

def TellClasses():

    return [
             # xForm
             xFormArmature,
             xFormBone,
             xFormGeometryObject,
             xFormObjectInstance,
             xFormCurvePin,
           ]

#*#-------------------------------#++#-------------------------------#*#
# X - F O R M   N O D E S
#*#-------------------------------#++#-------------------------------#*#

def reset_object_data(ob):
    # moving this to a common function so I can figure out the details later
    ob.id_properties_clear() # we must remove the custom properties so we can make them again.
    ob.constraints.clear()
    ob.animation_data_clear() # this is a little dangerous. TODO find a better solution since this can wipe animation the user wants to keep
    ob.modifiers.clear() # I would also like a way to copy modifiers and their settings, or bake them down. oh well

def get_parent_node(mantis_node, type = 'XFORM'):
    # type variable for selecting whether to get either
    #   the parent xForm  or the inheritance node
    node_line, _last_socket = trace_single_line(mantis_node, "Relationship")
    for i in range(len(node_line)):
        # check each of the possible parent types.
        if ( (node_line[ i ].__class__.__name__ == 'LinkInherit') ):
            try: # it's the next one
                if (type == 'XFORM'):
                    return node_line[ i + 1 ]
                else: # type = 'LINK'
                    return node_line[ i ]
            except IndexError: # if there is no next one...
                return None # then there's no parent!
    return None

def get_matrix(node):
    matrix = node.evaluate_input('Matrix')
    if matrix is None:
        node_line, socket = trace_single_line(node, "Matrix")
        raise RuntimeError(wrapRed(f"No matrix found for Armature {node}"))
    return matrix

def set_object_parent(node):
    from bpy import data
    parent_xForm_info = get_parent_xForm_info(node)
    if parent_xForm_info.object_type  == '':
        return # no parent
    elif parent_xForm_info.object_type in ['armature', 'object']:
        parent = data.objects.get(parent_xForm_info.parent_edit_name)
        if parent_xForm_info.parent_edit_name and parent is None:
            raise GraphError(f"Could not get parent object for node {node}.")
        node.bGetObject().parent = parent
    else: # it is a bone
        armOb = data.objects.get(parent_xForm_info.root_armature)
        node_ob = node.bGetObject()
        node_ob.parent = armOb; node_ob.parent_type = 'BONE'
        # this one expects a string.
        node_ob.parent_bone = parent_xForm_info.self_edit_name

class xFormNode(MantisNode):
    def __init__(self, signature, base_tree, socket_templates=[]):
        super().__init__(signature, base_tree, socket_templates)
        self.node_type = 'XFORM'
        self.bObject=None

    # because new objects are created during prep phase
    def reset_execution(self):
        super().reset_execution()
        self.prepared=False
    
    def setup_custom_props(self, ob, input):
        from .mantis_dataclasses import custom_prop_template
        # detect custom inputs
        for i, l in enumerate(self.inputs[input].links):
            # we need to trace back all inputs
            custom_prop_data = self.evaluate_input(input, i)
            if not isinstance(custom_prop_data, custom_prop_template): continue
            from .drivers import MantisDriver
            name = custom_prop_data.name
            if name in ob.keys():
                raise RuntimeError("Error: cannot create a custom property with "
                                   "the same name as an existing property.")
            prop_type = custom_prop_data.prop_type
            match prop_type:
                case 'BOOL':
                    value = custom_prop_data.default_value_bool
                case 'INT':
                    value = custom_prop_data.default_value_int
                case 'FLOAT':
                    value = custom_prop_data.default_value_float
                case 'VECTOR':
                    value = custom_prop_data.default_value_vector
                case 'STRING':
                    value = custom_prop_data.default_value_string
            if (value is None):
                raise RuntimeError("Could not set value of custom parameter")
                # it creates a more confusing error later sometimes, better to catch it here.
            ob[name] = value
            ui_data = ob.id_properties_ui(name)
            ui_data.update(
                default=value,
                description=custom_prop_data.description)
            #if a number, set the min/max values. it may overflow on the C side
            if type(value) in [float, int]:
                for prop_name in ['min', 'max', 'soft_min', 'soft_max', ]:
                    prop_value = getattr(custom_prop_data, prop_name)
                    if type(value) == int: prop_value = int(prop_value)
                    # DO: figure out the right way to prevent an oveflow
                    try: # we have to do this as a keyword argument like this
                        ui_data.update( **{prop_name:prop_value} )
                    except OverflowError: #this occurs when the value is inf
                        prRed(f"invalid value {prop_value} for custom prop {prop_name}"
                                f" of type {type(value)} in {self}. It will remain unset.")
            ob.property_overridable_library_set(f"[\"{name}\"]", True)
            pass

class xFormArmature(xFormNode):
    '''A node representing an armature object'''

    def __init__(self, signature, base_tree):
        super().__init__(signature, base_tree, xFormArmatureSockets)
        self.init_parameters()
        self.set_traverse([("Relationship", "xForm Out")])
        setup_custom_property_inputs_outputs(self)

    def bPrepare(self, bContext=None):
        self.parameters['Matrix'] = get_matrix(self)
        self.prepared = True

    def bTransformPass(self, bContext = None,):
        # from .utilities import get_ui_node

        import bpy
        if (not isinstance(bContext, bpy.types.Context)):
            raise RuntimeError("Incorrect context")

        name = self.evaluate_input("Name")
        matrix = self.parameters['Matrix']
        reset_transforms = False

        #check if an object by the name exists
        if (name) and (ob := bpy.data.objects.get(name)):
            if (ob.animation_data):
                while (ob.animation_data.drivers):
                        ob.animation_data.drivers.remove(ob.animation_data.drivers[-1])
            for pb in ob.pose.bones:
                # clear it, even after deleting the edit bones,
                #  if we create them again the pose bones will be reused
                while (pb.constraints):
                    pb.constraints.remove(pb.constraints[-1])
                if reset_transforms:
                    pb.location = (0,0,0)
                    pb.rotation_euler = (0,0,0)
                    pb.rotation_quaternion = (1.0,0,0,0)
                    pb.rotation_axis_angle = (0,0,1.0,0)
                    pb.scale = (1.0,1.0,1.0)
            # feels ugly and bad, whatever
            collections = []
            for bc in ob.data.collections:
                collections.append(bc)
            for bc in collections:
                ob.data.collections.remove(bc)
            del collections
            # end ugly/bad
        else:
            # Create the Object
            ob = bpy.data.objects.new(name, bpy.data.armatures.new(name)) #create ob
            if (ob.name != name):
                raise RuntimeError("Could not create xForm object", name)
        
        # it seems this data sticks around even if the object was deleted, so clear it here.
        ob.id_properties_clear()

        self.bObject = ob.name
        ob.matrix_world = matrix.copy()
        ob.data.pose_position = 'REST'
        set_object_parent(self)

        # Link to Scene:
        if (ob.name not in bContext.view_layer.active_layer_collection.collection.objects):
            bContext.view_layer.active_layer_collection.collection.objects.link(ob)

        print( wrapGreen("Created Armature object: ")+ wrapWhite(ob.name))
        # Finalize the action
        # oddly, overriding context doesn't seem to work
        try:
            bpy.ops.object.select_all(action='DESELECT')
        except RuntimeError:
            pass # we're already in edit mode, should be OK to do this.
        bContext.view_layer.objects.active = ob
        selected=[]
        for other_ob in bpy.data.objects:
            if other_ob.mode == "EDIT":
                selected.append(other_ob)
        selected.append(ob)
        context_override = {"active_object":ob, "selected_objects":selected}
        print("Changing Armature Mode to " +wrapPurple("EDIT"))
        with bContext.temp_override(**context_override):
            bpy.ops.object.mode_set(mode='EDIT')
        if ob.mode != "EDIT":
            prRed("eh?")
        # clear it
        while (len(ob.data.edit_bones) > 0):
            ob.data.edit_bones.remove(ob.data.edit_bones[0])
        # bContext.view_layer.objects.active = prevAct

        # This will OVERWRITE the root armature since bones have to trace back to this one.
        root_armature = ob.name
        parent_xForm_info = get_parent_xForm_info(self)
        my_info = xForm_info(
            object_type='armature',
            root_armature= ob.name,
            parent_pose_name=parent_xForm_info.self_pose_name,
            parent_edit_name=parent_xForm_info.self_edit_name,
            self_pose_name=ob.name,
            self_edit_name=ob.name,
        )
        self.parameters['xForm Out'] = my_info

        self.executed = True
    
    def bFinalize(self, bContext = None):
        # custom properties
        self.setup_custom_props(self.bGetObject(), "Custom Properties")
        finish_drivers(self)

    def bGetObject(self, mode = ''):
        import bpy; return bpy.data.objects[self.parameters['xForm Out'].self_pose_name]

bone_inputs= [
         "Name",
         "Rotation Order",
         "Matrix",
         "Relationship",
         # IK settings
         "IK Stretch",
         "Lock IK",
         "IK Stiffness",
         "Limit IK",
         "X Min",
         "X Max",
         "Y Min",
         "Y Max",
         "Z Min",
         "Z Max",
         # Visual stuff
         "Bone Collection",
         "Hide",
         "Custom Object",
         "Custom Object xForm Override",
         "Custom Object Scale to Bone Length",
         "Custom Object Wireframe",
         "Custom Object Scale",
         "Custom Object Translation",
         "Custom Object Rotation",
         "Color",
         "Inherit Color",
         # Deform Stuff
         "Deform",
         "Envelope Distance",
         "Envelope Weight",
         "Envelope Multiply",
         "Envelope Head Radius",
         "Envelope Tail Radius",
         # BBone stuff:
         "BBone Segments",
         "BBone X Size",
         "BBone Z Size",
         "BBone HQ Deformation",
         "BBone X Curve-In",
         "BBone Z Curve-In",
         "BBone X Curve-Out",
         "BBone Z Curve-Out",
         "BBone Roll-In",
         "BBone Roll-Out",
         "BBone Inherit End Roll",
         "BBone Scale-In",
         "BBone Scale-Out",
         "BBone Ease-In",
         "BBone Ease-Out",
         "BBone Easing",
         "BBone Start Handle Type",
         "BBone Custom Start Handle",
         "BBone Start Handle Scale",
         "BBone Start Handle Ease",
         "BBone End Handle Type",
         "BBone Custom End Handle",
         "BBone End Handle Scale",
         "BBone End Handle Ease",
         # locks
         "Lock Location",
         "Lock Rotation",
         "Lock Scale",
         "Custom Properties",
]
class xFormBone(xFormNode):
    '''A node representing a bone in an armature'''
    # DO: make a way to identify which armature this belongs to
    def __init__(self, signature, base_tree):
        super().__init__(signature, base_tree)
        outputs = [
         "xForm Out",
        ]
        self.inputs.init_sockets(bone_inputs)
        self.outputs.init_sockets(outputs)
        self.socket_templates=xFormBoneSockets
        # TODO: implement socket templates completely for Bone
        # currently it is waiting on BBone and refactoring/cleanup.
        self.init_parameters()
        self.set_traverse([("Relationship", "xForm Out")])
        setup_custom_property_inputs_outputs(self)

    def bGetParentArmature(self):
        parent_xForm_info = get_parent_xForm_info(self)
        from bpy import data
        return data.objects.get(parent_xForm_info.root_armature)

    def bSetParent(self, eb):
        from bpy import data
        parent_xForm_info = get_parent_xForm_info(self)
        parent_armature = data.objects.get( parent_xForm_info.root_armature)
        if parent_xForm_info.self_edit_name != parent_xForm_info.root_armature:
            parent_bone = parent_armature.data.edit_bones.get( parent_xForm_info.self_edit_name)
            eb.parent = parent_bone
            parent_mantis_node = get_parent_node(self, type = 'LINK') # get the link node.
            # TODO probably need to send the parenting info or at least the signatures of intervening nodes.
            eb.use_connect = parent_mantis_node.evaluate_input("Connected")
            eb.use_inherit_rotation = parent_mantis_node.evaluate_input("Inherit Rotation")
            eb.inherit_scale = parent_mantis_node.evaluate_input("Inherit Scale")

    def bPrepare(self, bContext=None):
        self.parameters['Matrix'] = get_matrix(self)
        self.prepared = True

    def bTransformPass(self, bContext = None,): #possibly will need to pass context?
        import bpy
        from mathutils import Vector
        if not (name := self.evaluate_input("Name")):
            raise RuntimeError(wrapRed(f"Could not set name for bone in {self}"))
        if (not isinstance(bContext, bpy.types.Context)):
            raise RuntimeError("Incorrect context")
        if not (xF := self.bGetParentArmature()):
            raise RuntimeError("Could not create edit bone: ", name, " from node:", self, " Reason: No armature object to add bone to.")

        matrix = self.parameters['Matrix']
        length = matrix[3][3]

        if (xF):
            if (xF.mode != "EDIT"):
                raise RuntimeError("Armature Object Not in Edit Mode, exiting...")
        #
        # Create the Object
        d = xF.data
        eb = d.edit_bones.new(name)

        # Bone Collections:
        #    We treat each separate string as a Bone Collection that this object belongs to
        #    Bone Collections are fully qualified by their hierarchy.
        #    Separate Strings with "|" and indicate hierarchy with ">". These are special characters.
        # NOTE: if the user names the collections differently at different times, this will take the FIRST definition and go with it
        if self.inputs['Bone Collection'].links:
            bCol_groups = []
            for i, l in enumerate(self.inputs['Bone Collection'].links):
                bCol_group = self.evaluate_input("Bone Collection", index=i)
                bCol_groups.append(bCol_group)
            bCols = '|'.join(bCol_groups)
        else:
            bCols = self.evaluate_input("Bone Collection")
        if bCols: # it is actually possible to add a bone to no collections. odd.
            bone_collections = bCols.split("|")
            for collection_list in bone_collections:
                hierarchy = collection_list.split(">")
                col_parent = None
                for bCol in hierarchy:
                    if ( col := d.collections_all.get(bCol) ) is None:
                        col = d.collections.new(bCol)
                    col.parent = col_parent
                    col_parent = col
                d.collections_all.get(hierarchy[-1]).assign(eb)

        if (eb.name != name):
            prRed(f"Expected bone of name: {name}, got {eb.name} instead.")
            raise RuntimeError("Could not create bone ", name, "; Perhaps there is a duplicate bone name in the node tree?")
        eb.matrix  = matrix.copy()
        tailoffset = Vector((0,length,0)) #Vector((0,self.tailoffset, 0))
        tailoffset = matrix.copy().to_3x3() @ tailoffset
        eb.tail    = eb.head + tailoffset
        if (eb.name != name):
            raise RuntimeError("Could not create edit bone: ", name)
        assert (eb.name), "Bone must have a name."
        self.bObject = eb.name
        # The bone should have relationships going in at this point.

        self.bSetParent(eb)

        if eb.head == eb.tail:
            raise RuntimeError(wrapRed(f"Could not create edit bone: {name} because bone head was located in the same place as bone tail."))

        # Setup Deform attributes...
        eb.use_deform            = self.evaluate_input("Deform")
        eb.envelope_distance     = self.evaluate_input("Envelope Distance")
        eb.envelope_weight       = self.evaluate_input("Envelope Weight")
        eb.use_envelope_multiply = self.evaluate_input("Envelope Multiply")
        eb.head_radius           = self.evaluate_input("Envelope Head Radius")
        eb.tail_radius           = self.evaluate_input("Envelope Tail Radius")

        print( wrapGreen("Created Bone: ") + wrapOrange(eb.name) + wrapGreen(" in ") + wrapWhite(self.bGetParentArmature().name))

        parent_xForm_info = get_parent_xForm_info(self)
        my_info = xForm_info(
            object_type='bone',
            root_armature= xF.name,
            parent_pose_name=parent_xForm_info.self_pose_name,
            parent_edit_name=parent_xForm_info.self_edit_name,
            self_pose_name=eb.name,
            self_edit_name=eb.name,
        )
        self.parameters['xForm Out'] = my_info

        self.executed = True

    def set_bone_color(self, b, inherit_color, bContext):
        color_values = self.evaluate_input('Color')
        if color_values is None:
            prOrange(f"Warning: No color information found for {b.name}. This should not happen.")
            return
        if inherit_color and b.parent:
            b.color.palette=b.parent.color.palette
            if b.color.palette == 'CUSTOM':
                b.color.custom.active=b.parent.color.custom.active
                b.color.custom.normal=b.parent.color.custom.normal
                b.color.custom.select=b.parent.color.custom.select
            return

        from mathutils import Color
        color_active = Color(color_values[:3])
        color_normal = Color(color_values[3:6])
        color_select = Color(color_values[6:])
        is_theme_colors = False
        theme = bContext.preferences.themes[0]
        for i, color_set in enumerate(theme.bone_color_sets):
            if  ((color_active == color_set.active) and
                (color_normal == color_set.normal) and
                (color_select == color_set.select) ):
                            is_theme_colors=True; break
        if is_theme_colors:          # add 1, not 0-indexed
            b.color.palette = 'THEME'+str(i+1).zfill(2)
        elif    ((color_active == theme.view_3d.bone_pose_active) and
                (color_normal == theme.view_3d.bone_solid) and
                (color_select == theme.view_3d.bone_pose) ):
                        b.color.palette = 'DEFAULT'
        else:
            b.color.palette = 'CUSTOM'
            b.color.custom.active=color_active
            b.color.custom.normal=color_normal
            b.color.custom.select=color_select


    def bFinalize(self, bContext = None):
        b = self.bGetParentArmature().data.bones[self.bObject]
        # let's do bone colors first
        inherit_color = self.evaluate_input("Inherit Color")
        if len(self.inputs['Color'].links) > 0:
            inherit_color = False # use the link instead
        # try: # just in case, this shouldn't cause a failure
        self.set_bone_color(b, inherit_color, bContext)
        # except Exception as e:
        #     prRed("WARNING: failed to set color because of error, see report below:")
        #     prOrange(e)
        #
        do_bb=False
        b.bbone_x = self.evaluate_input("BBone X Size"); b.bbone_x = max(b.bbone_x, 0.0002)
        b.bbone_z = self.evaluate_input("BBone Z Size"); b.bbone_z = max(b.bbone_z, 0.0002)
        if (segs := self.evaluate_input("BBone Segments")) > 1:
            do_bb=True
            b.bbone_segments = segs
            b.bbone_x = self.evaluate_input("BBone X Size")
            b.bbone_z = self.evaluate_input("BBone Z Size")
            if self.evaluate_input("BBone HQ Deformation"):
                b.bbone_mapping_mode = "CURVED"
            # 'bbone_handle_type_start'    : ("BBone Start Handle Type", "AUTO"),
            # 'bbone_handle_type_end'      : ("BBone End Handle Type", "AUTO"),
            # 'bbone_custom_handle_start'  : ("BBone Custom Start Handle", "AUTO"),
            # 'bbone_custom_handle_end'    : ("BBone Custom End Handle", "AUTO"),
            if handle_type := self.evaluate_input("BBone Start Handle Type"):
                b.bbone_handle_type_start = handle_type
            if handle_type := self.evaluate_input("BBone End Handle Type"):
                b.bbone_handle_type_end = handle_type

            try:
                if (custom_handle := self.evaluate_input("BBone Custom Start Handle")):
                    b.bbone_custom_handle_start = self.bGetParentArmature().data.bones[custom_handle]
                if (custom_handle := self.evaluate_input("BBone Custom End Handle")):
                    b.bbone_custom_handle_end = self.bGetParentArmature().data.bones[custom_handle]
            except KeyError:
                prRed("Warning: BBone start or end handle not set because of missing bone in armature.")

            bone_props_socket= {
                'bbone_curveinx'     : ("BBone X Curve-In", 0.0),
                'bbone_curveinz'     : ("BBone Z Curve-In", 0.0),
                'bbone_curveoutx'    : ("BBone X Curve-Out", 0.0),
                'bbone_curveoutz'    : ("BBone Z Curve-Out", 0.0),
            }
            evaluate_sockets(self, b, bone_props_socket)
            # TODO this section should be done with props-socket thing
            b.bbone_handle_use_scale_start = self.evaluate_input("BBone Start Handle Scale")
            b.bbone_handle_use_scale_end = self.evaluate_input("BBone End Handle Scale")


        import bpy

        pb = self.bGetParentArmature().pose.bones[self.bObject]
        rotation_mode = self.evaluate_input("Rotation Order")
        if rotation_mode == "AUTO": rotation_mode = "XYZ"
        pb.rotation_mode = rotation_mode
        pb.id_properties_clear()
        # these are kept around unless explicitly deleted.
        # from .utilities import get_ui_node
        # np = get_ui_node(self.signature, self.base_tree)
        driver = None
        do_prints=False

        # custom properties
        self.setup_custom_props(pb, "Custom Properties")

        if (pb.is_in_ik_chain):
            # this  props_socket thing wasn't really meant to work here but it does, neat
            props_sockets = {
            'ik_stretch'          : ("IK Stretch", 0),
            'lock_ik_x'           : (("Lock IK", 0), False),
            'lock_ik_y'           : (("Lock IK", 1), False),
            'lock_ik_z'           : (("Lock IK", 2), False),
            'ik_stiffness_x'      : (("IK Stiffness", 0), 0.0),
            'ik_stiffness_y'      : (("IK Stiffness", 1), 0.0),
            'ik_stiffness_z'      : (("IK Stiffness", 2), 0.0),
            'use_ik_limit_x'      : (("Limit IK", 0), False),
            'use_ik_limit_y'      : (("Limit IK", 1), False),
            'use_ik_limit_z'      : (("Limit IK", 2), False),
            'ik_min_x'            : ("X Min", 0),
            'ik_max_x'            : ("X Max", 0),
            'ik_min_y'            : ("Y Min", 0),
            'ik_max_y'            : ("Y Max", 0),
            'ik_min_z'            : ("Z Min", 0),
            'ik_max_z'            : ("Z Max", 0),
            }
            evaluate_sockets(self, pb, props_sockets)
        if do_bb:
            props_sockets = {
            'bbone_curveinx'             : ("BBone X Curve-In", pb.bone.bbone_curveinx),
            'bbone_curveinz'             : ("BBone Z Curve-In", pb.bone.bbone_curveinz),
            'bbone_curveoutx'            : ("BBone X Curve-Out", pb.bone.bbone_curveoutx),
            'bbone_curveoutz'            : ("BBone Z Curve-Out", pb.bone.bbone_curveoutz),
            'bbone_easein'               : ("BBone Ease-In", 0),
            'bbone_easeout'              : ("BBone Ease-Out", 0),
            'bbone_rollin'               : ("BBone Roll-In", 0),
            'bbone_rollout'              : ("BBone Roll-Out", 0),
            'bbone_scalein'              : ("BBone Scale-In", (1,1,1)),
            'bbone_scaleout'             : ("BBone Scale-Out", (1,1,1)),
            }
            evaluate_sockets(self, pb, props_sockets)
            # we need to clear this stuff since our only real goal was to get some drivers from the above
            for attr_name in props_sockets.keys():
                try:
                    setattr(pb, attr_name, 0) # just clear it
                except ValueError:
                    setattr(pb, attr_name, (1.0,1.0,1.0)) # scale needs to be set to 1


            # important TODO... all of the drivers and stuff should be handled this way, right?
        # time to set up drivers!

        # just gonna add this to the end and build off it I guess
        props_sockets = {
            "lock_location"               : ("Lock Location", [False, False, False]),
            "lock_rotation"               : ("Lock Rotation", [False, False, False]),
            "lock_scale"                  : ("Lock Scale", [False, False, False]),
            'custom_shape_scale_xyz'      : ("Custom Object Scale",  (0.0,0.0,0.0) ),
            'custom_shape_translation'    : ("Custom Object Translation",  (0.0,0.0,0.0) ),
            'custom_shape_rotation_euler' : ("Custom Object Rotation",  (0.0,0.0,0.0) ),
            'use_custom_shape_bone_size'  : ("Custom Object Scale to Bone Length",  True,)
        }

        evaluate_sockets(self, pb, props_sockets)

        # this could probably be moved to bTransformPass
        props_sockets = {
            'hide'      : ("Hide", False),
            'show_wire' : ("Custom Object Wireframe", False),
        }
        evaluate_sockets(self, pb.bone, props_sockets)


        if (driver):
            pass
        # whatever I was doing there.... was stupid. CLEAN UP TODO
        # this is the right thing to do.
        finish_drivers(self)
        #
        # OK, visual settings
        #
        # Get the override xform's bone:



        pb.custom_shape_transform = None
        pb.custom_shape = None

        if len(self.inputs["Custom Object xForm Override"].links) > 0:
            trace = trace_single_line(self, "Custom Object xForm Override")
            try:
                pb.custom_shape_transform = trace[0][1].bGetObject()
            except AttributeError:
                pass

        if len(self.inputs["Custom Object"].links) > 0:
            trace = trace_single_line(self, "Custom Object")
            try:
                ob = trace[0][1].bGetObject()
            except AttributeError:
                ob=None
            if type(ob) in [bpy.types.Object]:
                pb.custom_shape = ob

    def bGetObject(self, mode = 'POSE'):
        if self.bObject is None: return None
        if mode in ["POSE", "OBJECT"] and self.bGetParentArmature().mode == "EDIT":
            raise RuntimeError("Cannot get Bone or PoseBone in Edit mode.")
        elif mode == "EDIT" and self.bGetParentArmature().mode != "EDIT":
            raise RuntimeError("Cannot get EditBone except in Edit mode.")
        try:
            if   (mode == 'EDIT'):
                return self.bGetParentArmature().data.edit_bones[self.bObject]
            elif (mode == 'OBJECT'):
                return self.bGetParentArmature().data.bones[self.bObject]
            elif (mode == 'POSE'):
                return self.bGetParentArmature().pose.bones[self.bObject]
        except Exception as e:
            prRed ("Cannot get bone for %s" % self)
            raise e

class xFormGeometryObject(xFormNode):
    '''A node representing an armature object'''
    def __init__(self, signature, base_tree):
        super().__init__(signature, base_tree, xFormGeometryObjectSockets)
        self.init_parameters()
        self.set_traverse([("Relationship", "xForm Out")])
        self.has_shape_keys = False
        setup_custom_property_inputs_outputs(self)

    def bPrepare(self, bContext = None,):
        import bpy
        if not self.evaluate_input("Name"):
            self.prepared = True
            self.executed = True
            # and return an error if there are any dependencies:
            if self.hierarchy_connections:
                raise GraphError(wrapRed(f"Cannot Generate object {self} because the chosen name is empty or invalid."))
            return
        self.bObject = bpy.data.objects.get(self.evaluate_input("Name"))
        trace = trace_single_line(self, "Geometry")
        if (not self.bObject):
            if trace[-1]:
                self.bObject = bpy.data.objects.new(self.evaluate_input("Name"), trace[-1].node.bGetObject())
        # handle mismatched data.
        data_wrong = False; data  = None
        if (self.inputs["Geometry"].is_linked and self.bObject.type == "EMPTY"):
            data_wrong = True; data = trace[-1].node.bGetObject()
        elif (not self.inputs["Geometry"].is_linked and not self.bObject.type == "EMPTY"):
            data_wrong = True
        # clumsy but functional
        if data_wrong:
            unlink_me = self.bObject
            unlink_me.name = "MANTIS_TRASH.000"
            for col in unlink_me.users_collection:
                col.objects.unlink(unlink_me)
            self.bObject = bpy.data.objects.new(self.evaluate_input("Name"), data)
        if self.bObject and (self.inputs["Geometry"].is_linked and self.bObject.type  in ["MESH", "CURVE"]):
            self.bObject.data = trace[-1].node.bGetObject()
        # NOW: find out if we need to duplicate the object data.
        dupe_data=False
        node_line = trace_single_line(self, "Deformer")[0]
        from .deformer_nodes import DeformerHook
        for deformer in node_line:
            if isinstance(deformer, DeformerHook) and  \
               deformer.evaluate_input("Affect Curve Radius") == True and \
               self.bObject.type == 'CURVE':
                    print(f"INFO: Duplicating data {self.bObject.data.name} in {self} so it can be used for drivers.")
                    dupe_data=True; break
        if dupe_data:
            name = self.bObject.data.name
            # it has to be a curve
            data = bpy.data.curves.get(self.bObject.data.name+"_MANTIS")
            if data: # Delete it and regenerate it if it exists.
                data.name+="_TRASH.000" # but we can't actually delete it here
                # since previous executions of the graph may be using it.
                # instead, we'll rename it and use a new copy. This will probably
                # be deleted on its own by Blender's garbage collector.
                # if it isn't, then it is still in use and I may NOT touch it.
            data=self.bObject.data.copy(); data.animation_data_clear()
            data.name = name+"_MANTIS"
            self.bObject.data = data
        reset_object_data(self.bObject)
        matrix= get_matrix(self)
        self.parameters['Matrix'] = matrix
        try:
            set_object_parent(self)
        except: # I guess it isn't ready yet. we'll do it later
            pass # (This can happen when solving schema.)
        self.bObject.matrix_world = matrix

        parent_xForm_info = get_parent_xForm_info(self)
        root_armature = parent_xForm_info.root_armature
        my_info = xForm_info(
            object_type='object',
            root_armature= root_armature,
            parent_pose_name=parent_xForm_info.self_edit_name,
            parent_edit_name=parent_xForm_info.self_pose_name,
            self_pose_name=self.bObject.name,
            self_edit_name=self.bObject.name,
        )
        self.parameters['xForm Out'] = my_info

        self.prepared = True

    def bTransformPass(self, bContext = None,):
        try:
            bContext.collection.objects.link(self.bObject)
        except RuntimeError: #already in; but a dangerous thing to pass.
            pass
        self.has_shape_keys = False
        # putting this in bTransformPass simply prevents it from being run more than once.
        # maybe I should do that with the rest of bPrepare, too.
        props_sockets = {
            'hide_viewport'    : ("Hide in Viewport", False),
            'hide_render'      : ("Hide in Render", False),
        }
        evaluate_sockets(self, self.bObject, props_sockets)
        self.executed = True

    def bFinalize(self, bContext = None):
        matrix= get_matrix(self)
        set_object_parent(self)
        self.bObject.matrix_world = matrix
        # custom properties
        self.setup_custom_props(self.bGetObject(), "Custom Properties")
        for i, (driver_key, driver_item) in enumerate(self.drivers.items()):
            print (wrapGreen(i), wrapWhite(self), wrapPurple(driver_key))
            prOrange(driver_item)
        finish_drivers(self)


    def bGetObject(self, mode = 'POSE'):
        return self.bObject

class xFormObjectInstance(xFormNode):
    """Represents an instance of an existing geometry object."""
    def __init__(self, signature, base_tree):
        super().__init__(signature, base_tree, xFormGeometryObjectInstanceSockets)
        self.init_parameters()
        # TODO: I think this field is a leftover from a test or something. see if it can be removed.
        self.links = {} # leave this empty for now!
        self.set_traverse([("Relationship", "xForm Out")])
        self.has_shape_keys = False # Shape Keys will make a dupe so this is OK
        setup_custom_property_inputs_outputs(self)

    def ui_modify_socket(self, ui_socket, socket_name=None):
        if ui_socket.name == 'As Instance':
            change_handled = True
            try:
                self.bObject.modifiers[0]['Socket_1'] = ui_socket.default_value
            except Exception as e:
                print("Failed to update mantis socket because of %s" % e,
                        "Updating tree instead.")
            return change_handled
        else:
            return super().ui_modify_socket(ui_socket, socket_name)

    def bPrepare(self, bContext = None,):
        from bpy import data
        empty_mesh = data.meshes.get("MANTIS_EMPTY_MESH")
        if not empty_mesh:
            empty_mesh = data.meshes.new("MANTIS_EMPTY_MESH")
        if not self.evaluate_input("Name"):
            self.prepared = True
            self.executed = True
            # and return an error if there are any dependencies:
            if self.hierarchy_connections:
                raise GraphError(wrapRed(f"Cannot Generate object {self} because the chosen name is empty or invalid."))
            return
        self.bObject = data.objects.get(self.evaluate_input("Name"))
        if (not self.bObject):
                self.bObject = data.objects.new(self.evaluate_input("Name"), empty_mesh)
        reset_object_data(self.bObject)
        matrix= get_matrix(self)
        self.parameters['Matrix'] = matrix
        set_object_parent(self)
        self.bObject.matrix_world = matrix

        parent_xForm_info = get_parent_xForm_info(self)
        root_armature = parent_xForm_info.root_armature
        my_info = xForm_info(
            object_type='object',
            root_armature= root_armature,
            parent_pose_name=parent_xForm_info.self_edit_name,
            parent_edit_name=parent_xForm_info.self_pose_name,
            self_pose_name=self.bObject.name,
            self_edit_name=self.bObject.name,
        )
        self.parameters['xForm Out'] = my_info

        self.prepared = True

    def bTransformPass(self, bContext = None,):
        try:
            bContext.collection.objects.link(self.bObject)
        except RuntimeError: #already in; but a dangerous thing to pass.
            pass
        self.has_shape_keys = False
        # putting this in bTransformPass simply prevents it from being run more than once.
        # maybe I should do that with the rest of bPrepare, too.
        props_sockets = {
            'hide_viewport'    : ("Hide in Viewport", False),
            'hide_render'      : ("Hide in Render", False),
        }
        evaluate_sockets(self, self.bObject, props_sockets)
        self.executed = True

    def bFinalize(self, bContext = None):
        # now we need to set the object instance up.
        from bpy import data
        trace = trace_single_line(self, "Source Object")
        for node in trace[0]:
            if node is self: continue # lol
            if (node.node_type == 'XFORM'):
                source_ob = node.bGetObject(); break
        modifier = self.bObject.modifiers.new("Object Instance", type='NODES')
        ng = data.node_groups.get("Object Instance")
        if ng is None:
            from .geometry_node_graphgen import gen_object_instance_node_group
            ng = gen_object_instance_node_group()
        modifier.node_group = ng
        modifier["Socket_0"] = source_ob
        modifier["Socket_1"] = self.evaluate_input("As Instance")
        # custom properties
        self.setup_custom_props(self.bGetObject(), "Custom Properties")
        for i, (driver_key, driver_item) in enumerate(self.drivers.items()):
            print (wrapGreen(i), wrapWhite(self), wrapPurple(driver_key))
            prOrange(driver_item)
        finish_drivers(self)

    def bGetObject(self, mode = 'POSE'):
        return self.bObject

class xFormCurvePin(xFormNode):
    """An xForm pinned to a specific location on a curve."""
    def __init__(self, signature, base_tree):
        super().__init__(signature, base_tree,xFormCurvePinSockets)
        self.init_parameters(additional_parameters={"Matrix":None})
        setup_custom_property_inputs_outputs(self)

    def prep_driver_values(self, constraint):
        from .misc_nodes import UtilityDriver, UtilitySwitch
        for socket_name in ["Curve Pin Factor", "Forward Axis","Up Axis",]:
            if self.inputs.get(socket_name) is None: continue # in case it has been bypassed
            if self.inputs[socket_name].is_linked:
                node_line, _last_socket = trace_single_line(self, socket_name)
                driver = None
                for other_node in node_line:
                    if other_node.node_type == 'DRIVER':
                        driver = other_node; break
                if isinstance(driver, UtilityDriver):
                    prop_amount = driver.evaluate_input("Property")
                elif isinstance(driver, UtilitySwitch):
                    xf=driver.GetxForm()
                    prop_amount = xf.evaluate_input(driver.evaluate_input('Parameter'))
                else:
                    return
                for template in self.socket_templates:
                    if template.name == socket_name: break
                setattr(constraint, template.blender_property, prop_amount )

    def bPrepare(self, bContext = None,):
        from bpy import data

        if not bContext: # lol
            import bpy
            bContext = bpy.context
        ob = data.objects.get(self.evaluate_input("Name"))
        if not ob:
            ob = data.objects.new(self.evaluate_input("Name"), None)
            ob.lock_location   = [True, True, True]
            ob.lock_rotation   = [True, True, True]
            ob.lock_scale      = [True, True, True]
            ob.lock_rotation_w = True
            ob.empty_display_type = 'CONE'
            ob.empty_display_size = 0.10

        self.bObject = ob

        reset_object_data(ob)

        node_line = trace_single_line(self, "Parent Curve")[0][1:] # slice excludes self
        for other_node in node_line:
            if other_node.node_type == 'XFORM':
                break
        else:
            raise GraphError(f"ERROR: {self} is not connected to a parent curve")
        if isinstance(other_node, (xFormArmature, xFormBone, xFormObjectInstance,)):
            raise GraphError(f"ERROR: {self} must be connected to curve,"
                              " not {other_node.__class__.__name__}")
        curve=other_node.bGetObject()
        if curve.type != 'CURVE':
            raise GraphError(f"ERROR: {self} must be connected to curve,"
                              " not {curve.type}")
        # we'll limit all the transforms so we can parent it
        #  because it is annoying to have a cluttered outliner.
        #
        # always do this so that everything stays consistent.
        spline_index = self.evaluate_input("Spline Index")
        from .utilities import get_extracted_spline_object
        curve = get_extracted_spline_object(curve, spline_index, self.mContext)
        # Link to Scene:
        for link_me in [ob, curve]:
            if (link_me.name not in bContext.view_layer.active_layer_collection.collection.objects):
                bContext.view_layer.active_layer_collection.collection.objects.link(link_me)

        c = ob.constraints.new("LIMIT_LOCATION")
        for max_min in ['max','min']:
            for axis in "xyz":
                setattr(c, "use_"+max_min+"_"+axis, True)
                setattr(c, max_min+"_"+axis, 0.0)
        c = ob.constraints.new("LIMIT_ROTATION")
        for axis in "xyz":
            setattr(c, "use_limit_"+axis, True)
            setattr(c, max_min+"_"+axis, 0.0)
        c = ob.constraints.new("LIMIT_SCALE")
        for max_min in ['max','min']:
            for axis in "xyz":
                setattr(c, "use_"+max_min+"_"+axis, True)
                setattr(c, max_min+"_"+axis, 1.0)
        c = ob.constraints.new("FOLLOW_PATH")
        c.target = curve
        c.use_fixed_location = True
        c.use_curve_radius = True
        c.use_curve_follow = True
        c.name = "Curve Pin"

        props_sockets = self.gen_property_socket_map()
        constraint_props_sockets = props_sockets.copy()
        del constraint_props_sockets['name']; del constraint_props_sockets['empty_display_size']
        del props_sockets['offset_factor']; del props_sockets['forward_axis']
        del props_sockets['up_axis']
        evaluate_sockets(self, c, constraint_props_sockets)
        evaluate_sockets(self, self.bObject, props_sockets)
        # this isn't usually run on xForm nodes so for now I need to set the
        #   driver's default values manually if I want a matrix now.
        # because the drivers may not have initialized yet.
        self.prep_driver_values(c)
        # now if all goes well... the matrix will be correct.
        dg = bContext.view_layer.depsgraph
        dg.update()
        # and the matrix should be correct now - copy because it may be modified
        self.parameters['Matrix'] = ob.matrix_world.copy()
        ob.parent=curve
        print( wrapGreen("Created Curve Pin: ") + wrapOrange(self.bObject.name) )

        parent_xForm_info = get_parent_xForm_info(self)
        root_armature = parent_xForm_info.root_armature
        my_info = xForm_info(
            object_type='object',
            root_armature= root_armature,
            parent_pose_name=curve.name,
            parent_edit_name=curve.name,
            self_pose_name=self.bObject.name,
            self_edit_name=self.bObject.name,
        )
        self.parameters['xForm Out'] = my_info

        self.prepared = True; self.executed = True

    def bFinalize(self, bContext = None):
        # custom properties
        self.setup_custom_props(self.bGetObject(), "Custom Properties")
        finish_drivers(self)

    def bGetObject(self, mode = 'POSE'):
        return self.bObject