topic Betreff: Curved roof with a slope and two different curves in Modeling

Curved roof with a slope and two different curves

ChrisKlms — Sun, 03 May 2026 18:28:54 GMT

Hello, beginner here,
I have a Ruled Shell defined by two arcs at different heights. The shell is flat/diagonal but I need it to follow two curved profiles which are arcs with different central points (low at the inner edge, curving up and over to a higher outer edge, see attached plan with center of curves). See screenshot attached. The red line shows the desired profile in section. I can't seem to modify this "section plan" as it follows my curve. I tried many other tools like slab, roof, wall but nothing seems to work and shell is the closest I got. I am not very familiar with the tool, is it possible to obtain my desired profile ? It has to be a single simple shape as I use it for rendering etc. so It has to be easy to modify, I'm sure it's possible as it's a very simple shape but I spent the afternoon trying to make it work.

Thank you for any help

Re: Curved roof with a slope and two different curves

cuba — Sun, 03 May 2026 19:02:10 GMT

So you want a roof with varying curvature, where the eaves line is consistent (horizontal) everywhere, and the ridge line is also consistent (horizontal) everywhere. The roof does not lie in a single plane, but each rafter has a different pitch.

Betreff: Curved roof with a slope and two different curves

runxel — Sun, 03 May 2026 19:34:11 GMT

First draw your shell with this method in the floor plan

Then rotate it in 3D 90° so its axis is parrallel to the Z-axis.

Back in 2D the trick now is to use the menu command "define shell contour". You can then draw the portion of the shell that you want to keep.

Betreff: Curved roof with a slope and two different curves

Lingwisyer — Mon, 04 May 2026 01:20:19 GMT

"curving up and over to a higher outer edge"

Modifying the shell contour will make the edge change height, even more so if it is not a straight pitch from inside to outside...

Ling.

Betreff: Curved roof with a slope and two different curves

runxel — Mon, 04 May 2026 10:00:38 GMT

@Lingwisyer schrieb:

"curving up and over to a higher outer edge"

Modifying the shell contour will make the edge change height, even more so if it is not a straight pitch from inside to outside...

That is true – but it is not what the OP has drawn.

It's still totally possible to achieve that, but now we need SEO to accomplish that (by using a vertical moved copy of the same element):

Re: Curved roof with a slope and two different curves

Patrick M — Mon, 04 May 2026 23:16:37 GMT

hmmm... not sure about the exact design, but seems a complex profile beam with a taper and/or segments may help get you what you need. for a lot of curved/round/etc. elements like this, I lean on other platforms (rhino is way better at this)

Re: Curved roof with a slope and two different curves

cuba — Tue, 05 May 2026 07:42:14 GMT

Note to myself: for a simple shape there must be a simple solution:

Draw a slab, convert it to a morph and move the corner points... (use another slab as a reference)