Help needed with 3D GUI LayerMask & PostProcess/Camera (part2)

You have teaching skills my friend, clearly. May be you are a teacher?

Turns out it was exactly what I ‘sensed’ (but couldn’t resolve;)
In fact, I had it all right in the first place, except for my 3D controls and next started mess it all up simply because I wasn’t really knowing what I was doing.

This is exactly the last part I was missing (of 3 in total). But what I like even more than the solution is the explanation of 1) LayerMask 2) Camera 3) GUI and post-process… the last one for the 3D GUI, I believe is mostly a ‘personal’ tweak of mine;) But I bet many users (and especially newcomers) would like to have these explanation (in the doc) and eventually also a PG.

May be you have noticed that the PG featured in the 4.2 official (with the lovely, cute, i luv it, little pirate fort) does not have the GUI button on top of PP? I found it would have been nice to make 1) a nicer button 2) display the button on top… don’t you think? Same as I did not find a PG example featured in the doc for this (to which you could have pointed me directly instead of doing all this (again thanks so much).

So, as a conclusion, is there or is there not an example and mention of the above (short version) in the doc? And if no, would you say that parts of the above would be worth a mention. If so, I would also be open to take some time to provide with (the base) of a nicer and more comprehensive PG…
Again thanks so much for your time and all the above.
Have an awesome day,