H-mech

Got it! I should have read help carefully ))
There is an attribute for transferring materials: fbx_material_name
The name of the material is written in it.
In the shop_materialpath attribute it is necessary to specify the existing shader (principledshader, let's say)
There is also an attribute material_override - for overriding shader parameters.

And after all this the materials are transferred! Yay!

Has nothing changed since 2014? I am facing the same problem! Can anyone tell me what to do?

Anyway, I got a little dumb and tried to transfer the data incorrectly. I found an example, analyzed it, and it worked
Here's a link if anyone needs one of these

https://www.sidefx.com/docs/hdk/_s_o_p_2_s_o_p__blind_data_8_c-example.html [www.sidefx.com]