Reference Plane options for Roofs

[Laszlo Nagy]

Slabs now have Reference Plane, which can be set to Top, Bottom, Core Top, Core Bottom. Additionally, we have commands to modify the reference plane location of an existing Slab.

I wish to have these same options available for Roofs as well.
One common scenario where this would be helpful can be seen in the following thread:

https://community.graphisoft.com/t5/Design-forum/Roof-Wall-Connection/td-p/223445?t=47470

[Laszlo Nagy]

Long-time wish:

https://community.graphisoft.com/t5/Wishes/Reference-Plane-options-for-Roofs/m-p/225150#M14121

[snow]

...even more reason to bring it on top... in remembrance again... and to underline the urgency...😉

[Roderick_Anderson]

I will add my vote to this as well !

[vdentello]

Well, it's turning 10 this year!
I hope It never gets to college, in a blink of an eye it's gonna be 18 and long gone and independent!

Since we're forced to use Roofs to model ramps, it's pretty painful to go back and reset it's contstant thickness back to 20 for example, as you interact with it, it changes it's height because this is not the default parameter, it's the offset on Y. 

Plus, you have to go from floor to floor, and not have a little annoying bouncing edge that has to be fixed every single time. 

[rakurs]

I have to add a layer of insulation under part of the roof which I split for that reason, and... Yeah, now I have to manually go to a section and reposition the insulated roof because it went upwards, and their respective reference lines are no longer at the same height, which could cause errors when you draw from the plan - why are these two "same" roofs not on the same height?

We could also use another setting which would allow you to use the thickness as a vertical projection, or as a orthogonal section on the pitch. Sometimes you need to have the thickness defined vertically.