请帮我写一个maya里记录每个层级链接的材质信息然后导出json文件到桌面

好的，我可以为您提供一个Python脚本，用于在Maya中记录每个层级链接的材质信息，并将其导出为JSON文件到桌面。以下是代码：

import maya.cmds as cmds
import json
import os

def get_materials(node):
    """
    获取给定节点的材质信息
    """
    materials = []
    shapes = cmds.listRelatives(node, shapes=True)
    if shapes:
        for shape in shapes:
            shading_engines = cmds.listConnections(shape, type="shadingEngine")
            if shading_engines:
                for shading_engine in shading_engines:
                    materials.append(cmds.ls(cmds.listConnections(shading_engine + ".surfaceShader"), materials=True)[0])
    return materials

def get_hierarchy(node):
    """
    获取给定节点的层级链接
    """
    hierarchy = []
    parent = cmds.listRelatives(node, parent=True)
    if parent:
        hierarchy.extend(get_hierarchy(parent[0]))
    hierarchy.append(node)
    return hierarchy

def export_materials():
    """
    导出材质信息到JSON文件
    """
    selection = cmds.ls(selection=True)
    if not selection:
        cmds.warning("请至少选择一个节点！")
        return
    materials_dict = {}
    for node in selection:
        hierarchy = get_hierarchy(node)
        materials = get_materials(node)
        for i, level in enumerate(hierarchy):
            if level not in materials_dict:
                materials_dict[level] = {}
            if i == len(hierarchy) - 1:
                materials_dict[level]["materials"] = materials
            else:
                if hierarchy[i+1] not in materials_dict[level]:
                    materials_dict[level][hierarchy[i+1]] = {}
                materials_dict[level][hierarchy[i+1]]["materials"] = materials
    desktop_path = os.path.expanduser("~/Desktop")
    file_path = os.path.join(desktop_path, "materials.json")
    with open(file_path, "w") as f:
        json.dump(materials_dict, f, indent=4)
    cmds.confirmDialog(title="导出成功", message="材质信息已成功导出到桌面！", button=["好的"])

export_materials()

您可以将此代码保存为.py文件并在Maya中运行。请注意，此脚本仅适用于选择的节点及其子节点。如果您想要记录整个场景中的所有节点，请选择根节点并运行脚本。