Freestyle. How only selected edges.

[brothermechanic]

Hello
I have a small problem, how to solve it?
This is my scene
http://wstaw.org/m/2014/12/10/plasma-desktopkh5015.png
https://drive.google.com/file/d/0B2gY2jqH8FS8UUtGSmdCVEpHeFk/view?usp=sharing
I want to outline the plane (only border), but get the grid
http://wstaw.org/m/2014/12/10/untitled.png

I try to mark freestyle edge, but this is don’t work, because polygons of my plane don’t merged.

Thank you

[Photox (Tim Gregory)]

That’s a good one. Just to make sure, is this the effect you are looking for? (this was photoshopped)

[brothermechanic]

yes
how to do that with freestyle?

[eppo]

I wonder if Blender render and Render option “Edge” alone on Post Processing would do what you want.