Hidden line

Hi,

I 've wrote a function to show objects with hidden lines. I use the stencil buffer method. I want retrieve the coordinates of all lines visibles on the rendering. I’ve tried to use the feedbackbuffer but these datas include all lines (hidden or not).

If someone knows a solution for me it 'll be helpfull.

Or Perhaps another method for a fast correct hidden lines rendering.

Thanks,

Seb