Quote Originally Posted by User137
The kind of borders you had there in the sample screenshot looks like having 2000 faces used or so in borders to get such a smooth details. That kind is achievable by making it with a modelling program and loading it up in your program, or making the borders with your own function. Consists of 12 cylinder shapes and 8 spheres.

Yeah other way is to render with GL_LINES after (or before, looks different with z-buffer) GL_QUADS and glLineWidth to set line width.
it don't need to look like the sample, it only need to give a better contrast to the edges

edit: i will try render the same cube twice with GL_Lines on the second draw, i will post results soon