topic Re: Transferring a value from a variable to a lib part parameter (with SYMB_POS_FROM_SURVEY_POINT) in GDL

Transferring a value from a variable to a lib part parameter (with SYMB_POS_FROM_SURVEY_POINT)

Martin Jan Rosa — Sat, 28 Sep 2024 13:18:51 GMT

Dear GDLers,

I am working on a library object that is similar to the Coordinate Dimensions object from the standard library. However, my goal is to have the X and Y coordinates relative to the Survey Point as a library element parameter, and thus be able to output them to a schedule as other library part parameters.

In the 2D script I work with the coordinates using SYMB_POS_FROM_SURVEY_POINT (plus some transformations due to our national practice - this is also the reason why I don't use the standard Survey Coordinate X,Y,Z property for listing in the schedule).

I'm struggling with how to get the value of such a variable into a parameter. The usual route via PARAMETERS doesn't work for me. At the same time, I can't use that SYMB_POS_FROM_SURVEY_POINT directly in the Parameter script (it pops up an error saying it's "project dependent", and I'm not actually surprised at the non-functionality here).

Can anyone think of a tip that might guide me a bit to the right solution?

Cheers,

Martin

Re: Transferring a value from a variable to a lib part parameter (with SYMB_POS_FROM_SURVEY_POINT)

scottjm — Sat, 28 Sep 2024 23:31:53 GMT

Based on the GDL reference guide the data of

SYMB_POS_FROM_SURVEY_POINT is not accessible by the parameter script, therefore it’s impossible to push that data back into a Parameter unfortunately.

https://gdl.graphisoft.com/reference-guide/general-object-parameters

the only other way I can think to do it is to use

SYMB_POS_X etc and enter the co-ordinates of your survey point in manually and does the offset calculation.
This would mean you’d have to enter the survey point co-ordinates manually in every object though which would be possible risk for input errors.

does the standard Archicad co-ordinate object have parameters you can schedule?

Re: Transferring a value from a variable to a lib part parameter (with SYMB_POS_FROM_SURVEY_POINT)

Martin Jan Rosa — Mon, 30 Sep 2024 07:57:13 GMT

Thank you for your reply, which confirms my concerns.

Unfortunately, the standard co-ordinate object does not have the necessary X/Y/Z parameters that could be shown in table.

Re: Transferring a value from a variable to a lib part parameter (with SYMB_POS_FROM_SURVEY_POINT)

scottjm — Mon, 30 Sep 2024 11:08:12 GMT

I’ve been lured down that dark path by GDL many times only to find out a certain global variable doesn’t work with the parameter script. It’s very frustrating.

Re: Transferring a value from a variable to a lib part parameter (with SYMB_POS_FROM_SURVEY_POINT)

Piotr Dobrowolski — Thu, 10 Oct 2024 07:31:13 GMT

The only way to use such global parameters in parameter script is a temporary save to txt/xml file from within UI script and load it back in parameter script.

Re: Transferring a value from a variable to a lib part parameter (with SYMB_POS_FROM_SURVEY_POINT)

Tomas Stehlik — Thu, 10 Oct 2024 11:29:32 GMT

...I also needed these values, for lists (unavailable, 0)

using the object (at the survey point) I found the current global coordinates of the survey point and wrote them for ArchiCAD using the MASTER_GDL object in the user values USER_GLOBAL_1 (U_G_2; U_G_3)

I have the MASTER object in the Embedded Library and it needs to be written again when the SRV PNT is moved.

The returned SRV PNT and GLOB_NORTH_DIR location values are enough for each point to calculate its position to the survey point and such a value can be used in the main window and the properties window.
Small problem is with GLOB_WORLD_ORIGO_OFFSET_X (_Y) but acceptable for me...

I think writing to the Parameter is not good, because it is only updated in the dialog of the object (open). It is necessary to reserve in TW.

Re: Transferring a value from a variable to a lib part parameter (with SYMB_POS_FROM_SURVEY_POINT)

NBGheikki — Tue, 16 Sep 2025 11:26:01 GMT

Another victim reporting for this rabbit hole, in my case trying to let an object have it's location in the world as a parameter... Frustratingly you can say "print GLOB_PROJECT_LONGITUDE" in the Master and it will tell the correct number, but when you say "parameters foo=GLOB_PROJECT_LONGITUDE", you'll get a zero.

We might get legislation that requires doors to report their position in the world in the future. Can't do it in properties, no variable for the project coordinates.