After all your mostly ineffective attempts at creating a vampire effect in Carrara by tweaking the alpha channel, or putting a hole in front the camera, or all kinds of contorted solutions that simply won't scale to a complex scene with numerous characters, here is Shade3D's solution. It's simple, all you have to do is to disable the reflection attribute for those shaders that you don't want to reflect.

A Vampire Effect should be a built-in feature in every 3D app. Here in the US, all local TV stations run vampire movies on Saturday nights, so it's not an unusual thing.

If your Carrara 'Pro' can't do it, then take it back and rewrite it.