How to draw a plane not coplanar

[Orionis98]

First of all, let me say that I'm not an expert and I use SU only for my personal hobby, since years. I'm Italian and I use the localized versione so please forgive me if I use wrong terms or terminologies.

I wish to draw a surface to connect two perpendicular plane at different heights. It should be a ramp between to roads with an angles of, in example, of 45°. I include an image of a simple test.
I can not find a solution; I presume that is because the two connecting lines are not planar, but how to do it, if possible?

I tried the FollowMeAndKeep plugin, but it does not return an acceptable result due that the two closing lines are perpendicular.

I also draw the shape on the XY planes and the I rotated the Y (green axe) up to the desired height, but, a part the the lengh correction (cosine of angle) I should take in account, the big problem is that the ramp surface is also rotated giving a funny result (I image a car that will drive onto an inclined plane !)

I assume that this is not doable in SU or, better, I'm too stupid.
This is the image:

Final note: please consider that the road surface should be quite worked (rails, depth, middle lines...) later.

[Jean Lemire]

Click in sequence on the Scenes tabs of this SU file for ideas.

Ramp between 2 roads at 90 degrees.skp

[Orionis98]

@Jean-Lemire
Thank you Jean, I saw your drawing. It is something already tried, unfortunately the resulting ramp is not really a surface but the sum of two surfaces smoothed so it can not be reworked further (I can not push it).
I found a possible (ugly and unnatural) solution adding a triangle at the top ramp end so to have the two connecting lines at the same level.
With some aesthetic additions it could be used, but I can not say to be fully satisfied.
I would post the result of my attempt, but possibly tomorrow since it is almost midnight now and here.
I wonder how many users have had the same probles and how they fix it.
Anyway, thanks again.

[Orionis98]

@Orionis98 said in How to draw a plane not coplanar:

@Jean-Lemire
I would post the result of my attempt, but possibly tomorrow since it is almost midnight now and here.

Here are the images of my solution: the building one and the final one added to world scene.
Not the maximum, but anyway.

[Jean Lemire]

Click in sequence on the scenes tabs of this SU file for more ideas.

Notice that Orionis98 shows a better start and finish. The real profile shall have a smooth curves at both ends of this junction road.

ramp-between-2-roads-at-90-degrees 2.skp

A better approach might be as in this file.

ramp-between-2-roads-at-90-degrees 3.skp

And the, the junction road could also have an horizontal curve so that the transitions between it and both roads are smoother than with a sharp angle.

[Orionis98]

@Jean-Lemire
Unfortunately I can not open your file; I'm using SU2020 and your scene requires the SU2022. Could you pls repost it downgraded?
Thanks

[Jean Lemire]

Here they are in 2017 format.

ramp-between-2-roads-at-90-degrees 2.skp

ramp-between-2-roads-at-90-degrees 3.skp