I'm developing a simple application that currently just displays a set of vector points as a 3D shape. This was working well using P3D to render the canvas. 

The problem is that I have added the controlP5 library to my sketch and that doesn't work well with P3D, so I switched to OPENGL, but this has the effect of making the lines look terrible, as shown in the example image below:

I've tried using h int(DISABLE_OPENGL_2X_SMOOTH); to no effect and have also tried disabling  GL_LINE_SMOOTH, but nothing seems to change the quality of the line when I use OpenGL.

I really want to have the crisp aliased lines from P3D, is there any way to do this with OpenGL?

Thanks.