but there's a problem : when I render the current frame, the contour are rendered, but when I do a batch render of my scene, there's no more contours !!!
I had the same problem with batch rendering... Then I realized that within Maya the batch render worked fine. As I was working late and getting a little bit tired I ended finding out after a few minutes that my MayaNetRender and Smedge where set to render with the default Maya render instead of MentalRay. I just switched and everything is now fine.