Render Mode Fade vs Opaque

Unity 2017 4.19F1

Hello there,

i want to fade out buildings once my hero walks behind them.
Here is rendering mode Opaque:

Rendering Mode Fade:


i want it to look just like opaque with 1.0 Alpha and then equally fade with alpha.
What am i missing?

 

Efficient, and correct sorting of 3d transparency in real time rendering is still an unsolved problem.
https://forum.unity.com/threads/render-mode-transparent-doesnt-work-see-video.357853/#post-2315934

 

thanks alot, i have found a shader online that uses z-sorting as described in the link. works like a charm