Add adjustable distance to RBM?

Ive been tryin to get a fresnel effect from the RBM shader. It works but gives everything a reflection, is it possbile to add distance settings so that itll only effect things closest to camera? Been trying different things like other FAR_PLANE also adding things like '* 0.2' in different locations in the shader itself but really going nowhere, anyone have any tips on what i could try (very much not good at coding)?

Im banging my head against the wall here, cant get it to work no matter how deep i dig to understand shader coding

Interested at this too.