only one object to have edje ? how to ?

hi , i want to add adjes only to one thing in the render , the rest stays without edjes ,

how do i do that ?

Separate the objects by render layer and only enable edges for the render layer containing the desired object. Use an Alpha Over node to combine the render layers in the compositor. Do not use a Z-Combine node because edge rendering is an alpha effect and the outer edges will be eclipsed by the depth buffers of the render layers via z-combine as are all other alpha effects.