ofEnableSmoothing() doesn't have any effect

Hi, I’m using OF 0.9.8 on Mac OSX 10.11

I see no difference between enabling and disabling the smoothing.

I know it’s only effective when drawing in Lines (unfilled).

But when I test it, I just see no difference at all.

Is it not working on some OS? or is it really hard to see the difference?

And one more question, how is smoothing different from setting the global number of samples.

I mean I can do antialiasing by adding such code as below in main.cpp. and how it is different from setting the smoothing?

ofAppGlutWindow window.setGlutDisplayString(“rgba double samples>=4 depth”);
or
ofGLFWWindowSettings settings.numSamples = 4;