Decrease line thickness in glass brain?

[Shotgunosine]

I'm trying to reproduce a visualization that looks like this:

But with the glass brain option in MRIcroGL, the thickness of the edges gets exagerated, giving it almost a marker-drawn, chunky aesthetic:

Is there a way to tweak the glass brain renderer so that it looks more similar to the images I'm trying to reproduce?

[neurolabusc]

I would use Surfice. The Script/Templates/subcortical and Script/Templates/node Python scripts should give you some good ideas.