I've created a minimal test case for my question: http://pastebin.com/TPXFgxLj
The expected behavior is a red set of lines, with a line width of 19. The actual behavior is a red set of lines, with a linewidth of (apparently) 1.
What am I doing wrong? I've tested the opacity option of the material, and it is followed (changing it to 1 does produce a more opaque set of lines). The color also seems to be followed correctly, so why isn't the linewidth?
Thanks!