Maya 将phong转换为mia材质

我正在尝试使用我找到的脚本将phong材质转换为mia材质

proc connectAndSet(string $original,string $target){
  $conn=connectionInfo -sfd ($BARK3);
  if ($conn!=""){
    connectAttr -force $conn $target;
  } else {
    connectAttr -force $original $target;
    disconnectAttr $original $target;
  }
}

proc convertPhongToMia(string $original){
  $target=`mrCreateCustomNode -asShader "" mia_material`;
  connectAndSet($original+".color",$target+".diffuse");

  $sg=`connectionInfo -dfs ($original+".outColor")`;
  if ($sg[0]!=""){
    $sgr=`match "[^.]*" ((string)$sg[0])`;
    connectAttr -force ($target+".outValue") ($sgr+".miMaterialShader");
    connectAttr -force ($target+".outValue") ($sgr+".miPhotonShader");
    connectAttr -force ($target+".outValue") ($sgr+".miShadowShader");
  }
  delete  $original;
  rename $target $original;
}




for ($item in`ls -et phong`)
  convertPhongToMia($item)

我完全不懂mel脚本，所以我不知道它为什么不工作，也不知道如何修复它 它显示以下错误：

// Error:   $conn=connectionInfo -sfd ($BARK3); // 
// Error: Line 2.24: Invalid use of Maya object "connectionInfo". // 
// Error:   $conn=connectionInfo -sfd ($BARK3); // 
// Error: Line 2.36: "$BARK3" is an undeclared variable. // 
// Error:   if ($conn!=""){ // 
// Error: Line 3.13: "$conn" is an undeclared variable. // 
// Error:     connectAttr -force $conn $target; // 
// Error: Line 4.36: "$conn" is an undeclared variable. 

---

$BARK3是我试图转换的材质的名称

//您需要在其中定义$BARK

proc connectAndSet(string $original,string $target, $BARK){
  // when you call mel function you need to use ` 
  $conn=`connectionInfo -sfd ($BARK)`;
  if ($conn!=""){
    connectAttr -force $conn $target;
  } else {
    connectAttr -force $original $target;
    disconnectAttr $original $target;
  }
}

---

//您需要在某些地方定义$BACK

proc connectAndSet(string $original,string $target, $BARK){
  // when you call mel function you need to use ` 
  $conn=`connectionInfo -sfd ($BARK)`;
  if ($conn!=""){
    connectAttr -force $conn $target;
  } else {
    connectAttr -force $original $target;
    disconnectAttr $original $target;
  }
}