How to use GDL to get building material ID?

[Anonymous]

Hello everyone! How can I get the building material ID at GDL? Please give me help, thanks!

[Laszlo Nagy]

Try the following GDL command:

REQUEST{2} ("Building_Material_info", name_or_index, param_name, value_or_values)

Returns information in the given variable(s) on a parameter of the specified building material. Expression returns 0 and contains dummy return values
(emtpy string or 0) if used in parameter script, causing additional warning. Possible building material parameter names corresponding to parameters of
the building material definition:
param_name:
"gs_bmat_id": building material id
"gs_bmat_surface": building material surface index
"gs_bmat_description": building material description
"gs_bmat_manufacturer": building material manufacturer
"gs_bmat_collisiondetection": building material participates in collision detection (0 or 1)
"gs_bmat_intersectionpriority": building material intersection priority
"gs_bmat_cutFill_properties": building material cut fill properties (cut fill index number, cut fill foreground pen index number,
cut fill background pen index number)
"gs_bmat_physical_properties": building material physical properties (thermal conductivity, density, heat capacity, embodied
energy, embodied carbon)

Examples:

REQUEST{2} ("Building_Material_info", "Brick", "gs_bmat_id", id)
REQUEST{2} ("Building_Material_info", "Brick", "gs_bmat_surface", index)
REQUEST{2} ("Building_Material_info", "Brick", "gs_bmat_physical_properties", thermalConductivity, density, heatCapacity, embodiedEnergy, embodiedCarbon)

In AC21 it is detailed on Page 450 of the GDL Reference Guide.

[Anonymous]

Thank you laszlonagy help, I have successfully applied in the basic building structure, if it is a composite building structure is invalid.

this is my code,I wrote a label to get slab building material information.

REQUEST{2} ("Building_Material_info",SLAB_BMAT_NAME,"gs_bmat_id",id1)
REQUEST{2("Building_Material_info",SLAB_BMAT_NAME,"gs_bmat_man
facturer",id2)
REQUEST{2} ("Building_Material_info",SLAB_BMAT_NAME, "gs_bmat_description",id3)

[LGreen]

If you are scripting a label to read a slab composite, the data can be extracted using the parameters on p345-348 of the AC21 GDL guide.

In particular you will want to look at SLAB_SKINS_BMAT_NAMES. This is an array of all the Building materials in the composite.

The code can be as simple as;

TEXT2 0,0, SLAB_SKINS_BMAT_NAMES[1]

This will display the external / top material in the composite.

[Anonymous]

Is there a step by step tutorial on how all of this would be achieved?
I am currently using AC21 & AC22.