Blender 3.6 motion path to curve addon

motion_to_curve.py

bl_info = {
    "name": "Motion Path to Curve",
    "blender": (3, 6, 0),
    "category": "Object",
}

import bpy

class OBJECT_OT_create_motion_curve(bpy.types.Operator):
    bl_idname = "object.create_motion_curve"
    bl_label = "Create Curve from Path"
    bl_options = {'REGISTER', 'UNDO'}

    def execute(self, context):
        ob = context.object
        scene = context.scene
        
        if ob is None:
            return {'CANCELLED'}
            
        bpy.ops.object.paths_calculate()
        
        mp = ob.motion_path
        if mp:
            path = bpy.data.curves.new(name='path', type='CURVE')
            path.dimensions = '3D'
            path.bevel_depth = 0.05
            
            curve = bpy.data.objects.new('Curve', path)
            scene.collection.objects.link(curve)
            
            spline = path.splines.new('BEZIER')
            spline.bezier_points.add(len(mp.points)-1)
            
            for i, o in enumerate(spline.bezier_points):
                o.co = mp.points[i].co
                o.handle_right_type = 'AUTO'
                o.handle_left_type = 'AUTO'
                
            build_mod = curve.modifiers.new(name="Build", type='BUILD')
            build_mod.frame_start = scene.frame_start
            build_mod.frame_duration = scene.frame_end - scene.frame_start + 1
            
            bpy.ops.object.paths_clear()
                
        return {'FINISHED'}

class VIEW3D_PT_motion_curve(bpy.types.Panel):
    bl_space_type = 'VIEW_3D'
    bl_region_type = 'UI'
    bl_category = 'Motion Curve'
    bl_label = "Motion to Curve"

    def draw(self, context):
        layout = self.layout
        layout.operator(OBJECT_OT_create_motion_curve.bl_idname)

classes = (
    OBJECT_OT_create_motion_curve,
    VIEW3D_PT_motion_curve,
)

def register():
    for cls in classes:
        bpy.utils.register_class(cls)

def unregister():
    for cls in reversed(classes):
        bpy.utils.unregister_class(cls)

if __name__ == "__main__":
    register()