The silhouette effect shows how objects appear when placed infront of a very bright background or source of light when no other light affect the scene.
I made this effect from inspispiration by shreck movie.
the character is made by VXComics as edd, though I added some details and the gun is by VVaris.
the effect may not show up in the image viewer when rendered but in such a case, feel free to switch to compositing layout and view it from the node editor preview.
This is a great effect - it will be good to play around with it. Well done and thanks for sharing.