Nice Trick BurrMan but for what I want it will be too difficult to do.

Yeah you right Michael Bryce skip the curves and even skip the surfaces, in fact Nothing appears in Bryce with my 3dm
file converted in DFX; Burrman is right I think It's simply because there is no curves in Bryce.

I'm not interseted to modeling in Bryce but I want a render with my planes and my curves.

I post you an exemple, it will be more clear