Maya Python脚本将纹理应用于所有对象，而不是选定对象

我正在使用Adobe的substance painter给出的脚本，该脚本应该导入sbsar文件，并将其转换为着色器 node ，然后将其应用到选定的对象，但当我执行脚本时，它将其应用到场景中的所有对象.

import maya.cmds as cmds 
 
def _connect_place2d(substance_node): 
    """ Connects the place2d texture node to the Substance node """ 
    place_node = cmds.shadingNode('place2dTexture', asUtility=True) 
 
    connect_attrs = [('outUV', 'uvCoord'), ('outUvFilterSize', 'uvFilterSize')] 
 
    for out_attr, in_attr in connect_attrs: 
        cmds.connectAttr('{}.{}'.format(place_node, out_attr), 
                         '{}.{}'.format(substance_node, in_attr)) 
 
def _find_shading_group(node): 
    """ Walks the shader graph to find the shading group """ 
    result = None 
 
    connections = cmds.listConnections(node, source=False) 
 
    if connections: 
        for connection in connections: 
            if cmds.nodeType(connection) == 'shadingEngine': 
                result = connection 
            else: 
                result = _find_shading_group(connection) 
                if result is not None: 
                    break 
 
    return result 
 
def _apply_substance_workflow_to_selected(substance_file, workflow): 
    """ Imports a mesh into Maya and applies the shader from a 
        Substance workflow to it """ 
    geometry = cmds.ls(geometry=True) 
 
    # Create the substance node and connect the place2d texture node 
    substance_node = cmds.shadingNode('substanceNode', asTexture=True) 
    _connect_place2d(substance_node) 
 
    # Load the Substance file 
    cmds.substanceNodeLoadSubstance(substance_node, substance_file) 
 
    # Apply the workflow 
    cmds.substanceNodeApplyWorkflow(substance_node, workflow=workflow) 
 
    # Acquire the shading group and apply it to the mesh 
    shading_group = _find_shading_group(substance_node) 
 
 
def demo_load_sbsar_workflow(): 
    """ Acquires an sbsar from a file dialog, loading and applying it to 
        any selected mesh """ 
    file_filter = 'Substance (*.sbsar);;' 
 
    files = cmds.fileDialog2(cap='Select a Substance file', fm=1, dialogStyle=2, 
                             okc='Open', fileFilter=file_filter) 
 
    if files: 
        substance_file = files[0] 
        _apply_substance_workflow_to_selected(substance_file, 
                                              cmds.substanceGetWorkflow()) 
 
if __name__ == '__main__': 
    demo_load_sbsar_workflow()

我完全期望它能立即将选定的纹理应用到我选定的网格上，而不是每个对象.