LNXSDK/leenkx/blender/lnx/logicnode/animation/LN_bone_ik.py

from lnx.logicnode.lnx_nodes import *

class BoneIKNode(LnxLogicTreeNode):
    """Performs inverse kinematics on the selected armature with specified bone.
    
    @input Object: Armature on which IK should be performed.

    @input Bone: Effector or tip bone for the inverse kinematics

    @input Goal Position: Position in world coordinates the effector bone will track to

    @input Enable Pole: Bend IK solution towards pole location

    @input Pole Position: Location of the pole in world coordinates

    @input Chain Length: Number of bones to include in the IK solver including the effector. If set to 0, all bones from effector to the root bone of the armature will be considered.
    
    @input Max Iterations: Maximum allowed FABRIK iterations to solve for IK. For longer chains, more iterations are needed.

    @input Precision: Presition of IK to stop at. It is described as a tolerence in length. Typically 0.01 is a good value.

    @input Roll Angle: Roll the bones along their local axis with specified radians. set 0 for no extra roll.
    """
    bl_idname = 'LNBoneIKNode'
    bl_label = 'Bone IK'
    lnx_version = 3
    lnx_section = 'armature'

    NUM_STATIC_INS = 9

    def update_advanced(self, context):
        self.update_sockets(context)

    property0: HaxeEnumProperty(
        'property0',
        items = [('2 Bone', '2 Bone', '2 Bone'),
                 ('FABRIK', 'FABRIK', 'FABRIK')],
        name='', default='2 Bone', update=update_advanced)

    def lnx_init(self, context):
        self.add_input('LnxNodeSocketObject', 'Object')
        self.add_input('LnxNodeSocketAnimTree', 'Action')
        self.add_input('LnxStringSocket', 'Bone')
        self.add_input('LnxVectorSocket', 'Goal Position')
        self.add_input('LnxBoolSocket', 'Enable Pole')
        self.add_input('LnxVectorSocket', 'Pole Position')
        self.add_input('LnxFloatSocket', 'Roll Angle')
        self.add_input('LnxFactorSocket', 'Influence', default_value = 1.0)
        self.add_input('LnxIntSocket', 'Bone Group', default_value = 0)

        self.add_output('LnxNodeSocketAnimTree', 'Result')

        self.update_sockets(context)

    def update_sockets(self, context):
        remove_list = []
        for i in range(BoneIKNode.NUM_STATIC_INS, len(self.inputs)):
            remove_list.append(self.inputs[i])
        for i in remove_list:
            self.inputs.remove(i)
        
        if self.property0 == 'FABRIK':
            self.add_input('LnxIntSocket', 'Chain Length')
            self.add_input('LnxIntSocket', 'Max Iterations', 10)
            self.add_input('LnxFloatSocket', 'Precision', 0.01)

    def draw_buttons(self, context, layout):
        layout.prop(self, 'property0')

    def get_replacement_node(self, node_tree: bpy.types.NodeTree):
        if self.lnx_version not in (0, 1, 2):
            raise LookupError()

        return NodeReplacement(
            'LNBoneIKNode', self.lnx_version, 'LNBoneIKNode', 3,
            in_socket_mapping={}, out_socket_mapping={}
        )