Render polygons only if there normals are looking at camera

#1

Hello can anybody help me with such shader. I need to render with arnold renderer. Polygons with the normals that looing at camera. And if the normal is not looking at camera i need like Matte material.
Well just do not render polygons of the mesh with normals which are not looking at camera.

#2

Use the Facing Ratio of sampler info node, plugged into a ramp material

#3

Thank you. Helped!