FileObjWriteOptions property setting seems not working about rhino-developer-samples

[dalefugier]

Seems to work here with the current Rhino 7, which is SR18. What version of Rhino 7 do you have?

[haheehong1]

Hello, dalefugier.
Thank you for answering 👍
I updated my rhino and package to 7.18.
Still the FileObj.Write options are not working.

I'm actually not running the sample code, but using part of the code and making a new gh component.
Like this.
https://github.com/haheehong1/ObjExport/blob/b97e57c859472b5473dc2a5ca06d9117cc5d66dc/objexporttest/objexporttestComponent.cs

With this code, I can write obj file but still the options (map y to z, export material..) are not working.
Do you know what should I chang to make this work?

[dalefugier]

Materials are not stored on the mesh geometry but, rather, the Rhino mesh objects. Thus, calling FileObj.Write and passing an array of mesh geometry will never produce mtl files.