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Create coordinate systems via weblink


Create coordinate systems via weblink

Todays topic is to create a coordinate system via a weblink script.

The code described here was tested under Creo 2.0 and 3.0.

A coordinate system is defined by:

  • its reference
  • translation in x,y & z
  • rotation around x,y & z axis

Unfortunately, there is no direct way in Creo to create a coordinate system like


To solve that, You have to use User defined features (UDFs).

I created a UDF called "wl_add_cs_w_dtms.gph.1" of a coordinate system and three corresponding datum planes.


The dimension prompts for translation are named trans_x, trans_y and trans_z. The names for rotation dimensions are set to rot_x, rot_y and rot_z.

To create Your desired csys You have to tell Creo where the UDF is stored. To do that change the corresponding config option by:

oSession.SetConfigOption("pro_group_dir", "D:\\data\\UDFs\\" );

If You have already set this config option for other purpuses, You could preveously use a

var udf_path_temp = oSession.GetConfigOptionValues("pro_group_dir");

to restore that value later.

Let's start creating those UDF-Create-Instructions.

var udf_instructions = pfcCreate ("pfcUDFCustomCreateInstructions").Create("wl_add_cs_w_dtms");

udf_instructions.DimDisplayType = pfcCreate ("pfcUDFDimensionDisplayType").UDFDISPLAY_BLANK;

The first line creates an empty instruction set and connects this to our UDF.

The second line adds the first instruction value by telling Creo that it should not display value-entering-dialogues during this script.

This defines the reference of our UDF. I use a Csys called "CS_0" in my parts as an origin.

var origin_of_csys = CurModel.GetItemByName(pfcCreate("pfcModelItemType").ITEM_COORD_SYS, "CS_0"); // this points to the reference csys

var selected_origin_of_csys = pfcCreate("MpfcSelect").CreateModelItemSelection(origin_of_csys, void null); // this selects the csys

var origin_ref = pfcCreate("pfcUDFReference").Create("UDF_REF_SYS", selected_origin_of_csys ); // this creates a reference from the selected csys

var udf_references = pfcCreate("pfcUDFReferences"); // this creates an empty container for references used by an UDF

udf_references.Append(origin_ref); // this appends our freshly created reference to this container

udf_instructions.References = udf_references; // this sets the references for our udf instruction set.

Sure, maybe You could merge all those steps to one or two lines of code. But Your code should somehow still be readable to You and other persons.

Next, We have to set the dimension values.

var udf_dimensions = pfcCreate("pfcUDFVariantValues"); // this creates an empty container for our dimension values used by the UDF

var translation_x = pfcCreate("pfcUDFVariantDimension").Create("trans_x", 10.05); // e.g. this moves the new csys 10.05mm in x - direction



var translation_y = pfcCreate("pfcUDFVariantDimension").Create("trans_y", 5.4);



var translation_z = pfcCreate("pfcUDFVariantDimension").Create("trans_z", 0.0);



var rotation_x = pfcCreate("pfcUDFVariantDimension").Create("rot_x", 20);



var rotation_y = pfcCreate("pfcUDFVariantDimension").Create("rot_y", 30);


var rotation_z = pfcCreate("pfcUDFVariantDimension").Create("rot_z", 40);



udf_instructions.VariantValues = udf_dimensions; // this adds our dimension values to our instruction set

Almost done. One single line to create the UDF.

var udf_group = CurModel.CreateUDFGroup(udf_instructions);

At this point a new csys and three datum planes should appear in the model tree. But those features are ugly named.

I like naming a csys and its corresponding planes in a pattern like CS_<name definition>, DTM_<name definition>_XY and so on.

To rename those features, run this.

var name_def = "TEST"; // Your <name definition>

var udf_csys = CurModel.GetItemByName(pfcCreate("pfcModelItemType").ITEM_COORD_SYS, "CS_UDF_TEMP"); // this selects a feature

udf_csys.SetName("CS_" + name_def); // this renames it


var udf_dtm_xy = CurModel.GetItemByName(pfcCreate("pfcModelItemType").ITEM_FEATURE, "DTM_UDF_TEMP_XY");

udf_dtm_xy.SetName("DTM_" + name_def + "_XY");


var udf_dtm_yz = CurModel.GetItemByName(pfcCreate("pfcModelItemType").ITEM_FEATURE, "DTM_UDF_TEMP_YZ");

udf_dtm_yz.SetName("DTM_" + name_def + "_YZ");


var udf_dtm_zx = CurModel.GetItemByName(pfcCreate("pfcModelItemType").ITEM_FEATURE, "DTM_UDF_TEMP_ZX");

udf_dtm_zx.SetName("DTM_" + name_def + "_ZX");


var udf_group_feat = CurModel.GetItemByName(pfcCreate("pfcModelItemType").ITEM_FEATURE, "WL_ADD_CS_W_DTMS" );


And finally You have to regenerate Your part. You have to have set the config option "regen_failure_handling" to "RESOLVE_MODE" to get any failures quickly fixed.

var regen_failure_handling_value = oSession.GetConfigOptionValues("regen_failure_handling"); // this stores the current value

oSession.SetConfigOption("regen_failure_handling", "RESOLVE_MODE" );  // this sets the option to "RESOLVE_MODE"

CurModel.Regenerate(void null);   // this regenerates the part

oSession.SetConfigOption("regen_failure_handling", regen_failure_handling_value.Item(0) ); // this restores the old value


If You want to create a bunch of csys, it is quite helpful to pack those lines above in a single function like:

function create_csys_from_file(reference_name, name_def, trans_x, trans_y, trans_z, rot_x, rot_y, rot_z){ ... }

For those, who use Zemax (optics simulation suite) there is more to come...

This thread is inactive and closed by the PTC Community Management Team. If you would like to provide a reply and re-open this thread, please notify the moderator and reference the thread. You may also use "Start a topic" button to ask a new question. Please be sure to include what version of the PTC product you are using so another community member knowledgeable about your version may be able to assist.

Hallo Matthias, danke für den sehr brauchbaren Artikel , kannst du biite das UDF nochmals  einstellen da das aktuelle nicht aufgerufen werden kann

"Retrieving group information...    Can not find group."

Danke und weiter so... !!!


Das UDF in der ZIP - Datei ist korrekt (MD5 Summe stimmt mit der Quelle überein).

Prüfe, ob die config option richtig gesetzt ist.

oSession.SetConfigOption("pro_group_dir", "D:\\data\\UDFs\\" ); 


The attached udf-file is correct. Both files (attached udf-file and source file) have the same md5 numbers.

Please check, if config option is correct.