fbx_curves_extractor.py

from unreal_engine import FbxManager, FbxIOSettings, FbxImporter, FbxScene
import unreal_engine as ue

class FbxCurvesExtractor:

    def __init__(self, filename):
        self.manager = FbxManager()
        io_settings = FbxIOSettings(self.manager, 'IOSROOT')
        self.manager.set_io_settings(io_settings)
        importer = FbxImporter(self.manager, 'importer')
        importer.initialize(filename, io_settings)
        self.scene = FbxScene(self.manager, 'scene')
        importer._import(self.scene)

    def get_objects_by_class(self, name):
        objects = []
        for i in range(0, self.scene.get_src_object_count()):
            obj = self.scene.get_src_object(i)
            if obj.get_class_name() == name:
                objects.append(obj)
        return objects

    def get_members_by_class(self, parent, name):
        members = []
        for i in range(0, parent.get_member_count()):
            member = parent.get_member(i)
            if member.get_class_name() == name:
                members.append(member)
        return members
    
    def get_anim_stacks(self):
        return self.get_objects_by_class('FbxAnimStack')

    def get_anim_layers(self, stack):
        return self.get_members_by_class(stack, 'FbxAnimLayer')

    def get_properties(self, obj):
        prop = obj.get_first_property()
        while prop:
            yield prop
            prop = obj.get_next_property(prop)

    def get_anim_curves(self, layer):
        curves = []
        for i in range(0, self.scene.get_src_object_count()):
            obj = self.scene.get_src_object(i)
            # retrieve object properties
            for prop in self.get_properties(obj):
                curve_node = prop.get_curve_node(layer)
                if not curve_node:
                    continue
                channels = []
                for chan_num in range(0, curve_node.get_channels_count()):
                    # always get the first curve
                    curve = curve_node.get_curve(chan_num, 0)
                    if not curve:
                        continue
                    keys = []
                    for key_id in range(0, curve.key_get_count()):
                        keys.append((curve.key_get_seconds(key_id), curve.key_get_value(key_id)))
                    channels.append({'name': curve_node.get_channel_name(chan_num), 'keys': keys})
                curves.append({'object': obj.get_name(), 'class': obj.get_class_name(), 'property': prop.get_name(), 'channels': channels})
        return curves

filename = 'C:/Users/roberto/Downloads/testCam/testCam.fbx'
#filename = 'C:/Users/Roberto/Desktop/Kaiju_Assets/Slicer/Animations/slicer_attack.fbx'

extractor = FbxCurvesExtractor(filename)

for stack in extractor.get_anim_stacks():
    for layer in extractor.get_anim_layers(stack):
        for curve in extractor.get_anim_curves(layer):
            ue.log(curve)