2 way slope of the parking ramp

[diesellam]

I'm using the floor to build the parking ramp.

The ramp slopes down from west to east.  I used the slope arrow to achieve it.

But I just found out today that that parking ramp also slopes down from north to south at the same time because of the sloped site.

So, how can do a 2 way slope at the same time?

I tried to add the 2nd sloped arrow but that option is greyed out.

Thanks in advance.

[Alfredo_Medina]

Start with a flat roof. Then use Modify Sub Elements, then input the elevation at the corner points of the floor. There might be some warnings about the thickness not being consistent, but if you input the correct numbers it should be good enough.

[diesellam]

I still didn't get the result I want.

The closet thing I could get is with the floor, not the roof.  Can you elaborate a little bit more?

See the attached PDF file.

I generated this geometry in FormZ in 10 mins.  This is exactly what I want but in Revit.

The tricky part is the "warp" part where 4 corners of the ramp are different, forming this warp shape.

It automatically "adds" a ridge because you can't have a 4 sided geometry without a ridge when 4 corners are at different elevation.  Is that true?

[Alfredo_Medina · Accepted solution]

Sorry, in my previous message, where I wrote "Start with a flat roof" I meant to write "Start with a flat floor".
A flat floor with this edges that you show in the image, and then modify sub elements, or add more points, and change the elevations of the points. In cases where four points become non-coplanar, yes, a new edge will be required.

[Alfredo_Medina]

Another alternative is a family with the generic adaptive template or the mass template, with a flat surface of the floor, and then with different elevations for the points. Load into project and do Floor by face.