topic Newbie question on roofs in Modeling

Newbie question on roofs

Anonymous — Tue, 23 May 2023 13:45:16 GMT

Hi All,

I am new to ArchiCAD...convert from AutoCAD.
Is there an easy way to create the following type of roof?

I have a 'square' building and wanting to place a roof which has an overhang to all four sides (equal in length). The roof is monopitch. Here's the thing. The soffit thickness needs to decrease in size from 190mm at outside wall to 90mm at the fascia.

Does anyone have any suggestions as I've tried a few things and all seem to be really crappy and not very logical.

Thanking u....

Re: Newbie question on roofs

Djordje — Mon, 15 Dec 2003 10:30:16 GMT

Michael wrote:
I am new to ArchiCAD...convert from AutoCAD. Is there an easy way to create the following type of roof?

I have a 'square' building and wanting to place a roof which has an overhang to all four sides (equal in length). The roof is monopitch. Here's the thing. The soffit thickness needs to decrease in size from 190mm at outside wall to 90mm at the fascia.

Does anyone have any suggestions as I've tried a few things and all seem to be really crappy and not very logical.

If I understood you properly, you need to model it with a rectangular mesh 90mm thick. Punch a hole in it the shape of the walls, and raise the outline of the hole 100mm.

I probably missed the point completely, therefore it would be good if you posted a screen shot/3D view of your roof. We're visual people 😉

Re: Newbie question on roofs

Anonymous — Mon, 15 Dec 2003 10:51:55 GMT

Visual creatures indeed...

Attached is a 30 second basic dwg (elevation) of what I want to create. The roof lines represent the outline including linings for the roof with the soffits tapering off to the fascia boards.

Hopefully a little clearer now...

Thanks Djordje

Re: Newbie question on roofs

Djordje — Mon, 15 Dec 2003 12:48:50 GMT

Michael wrote:
Visual creatures indeed...

Attached is a 30 second basic dwg (elevation) of what I want to create. The roof lines represent the outline including linings for the roof with the soffits tapering off to the fascia boards.

OK.

1. You can model the whole thing with a mesh, but it will not have any thickness so not good

2. You can model the fascia with the roofs, the top edge is horizontal, the bottom is vertical.

3. You can use SEO to cut off the excess roof below.

Re: Newbie question on roofs

Anonymous — Mon, 15 Dec 2003 19:18:31 GMT

Solid Element Operations would indeed be the way to go.
One question that I have, what would be the best method of creating the operator, mesh? Archicad primitive object?

I have always been a bit dissapointed in the level of sophistication of the eaves design in ArchiCAD. I think more user defined options would be good, particularly a horizontal soffit board.

I feel a wish list coming on..............

Re: Newbie question on roofs

Richard Morrison — Mon, 15 Dec 2003 19:26:08 GMT

Another easy way would be to trace the end view fascia outline with the slab tool (using the Magic Wand for speed) in the plan window. Then make the slab 40' tall (or whatever your total roof length is). Select the slab, and take a 3D view from the "top" of the roof (i.e. rear view in plan) and convert to a GDL object. Place this object, adjust height, and you're done! (Oh, and you'll need to use SEO to trim the walls.)

Re: Newbie question on roofs

Anonymous — Mon, 15 Dec 2003 22:48:06 GMT

Thank you all for your help.

I have finally achieved what it is I am wanting. It's not perfect as in plan the roof lines don't line up with one another and the roof does not meet the walls at exectly the right place but is pretty bloody close.

Attached is a *.mod file. of 2 roofs one above the other. The lower roof has 4 diff edge angles and the roof above has edges perpendicular. Found this is the easiest for me. Perhaps methods mentioned by you guys are better and easier and even more accurate.

Your thoughts on my method?

MOD files not allowed...sorry

Thanks again guys

Re: Newbie question on roofs

Richard Morrison — Tue, 16 Dec 2003 00:02:11 GMT

Too hard.

I did the attached in about 5 mins. just for the heck of it.

Re: Newbie question on roofs

Anonymous — Tue, 16 Dec 2003 00:05:57 GMT

Hi Richard,

I was able to do that as well, however, the problem I was having, was maintaining that tapered soffit to all four sides of the building.

Re: Newbie question on roofs

Richard Morrison — Tue, 16 Dec 2003 01:28:16 GMT

Michael wrote:
Hi Richard,

I was able to do that as well, however, the problem I was having, was maintaining that tapered soffit to all four sides of the building.

Oh, you've got the taper on FOUR sides? Sorry, I didn't pick that up from your elevation view.

Re: Newbie question on roofs

David Collins — Tue, 16 Dec 2003 08:31:04 GMT

Here's an ArchiForma solution, just for fun. The soffit can be easily modeled using the "ruled surface" tool, basically giving you a truncated pyramid, and then rotated into position under a normal roof slab.

If you plan to do this sort of thing a lot a parametric scripted GDL object using RULED might be another way to go.

Re: Newbie question on roofs

Djordje — Tue, 16 Dec 2003 08:35:20 GMT

David wrote:
Here's an ArchiForma solution, just for fun. The soffit can be easily modeled using the "ruled surface" tool, basically giving you a truncated pyramid, and then rotated into position under a normal roof slab.

If you plan to do this sort of thing a lot a parametric scripted GDL object using RULED might be another way to go.

Very good! Are the egdes of the "hole" by the walls vertical?

Congrats for 5000th message!

Another way of doing this is with GDL Toolbox - as it can follow the non-horizontal path, as will ArchiForma 2.0 I hear.

Re: Newbie question on roofs

Anonymous — Tue, 16 Dec 2003 08:37:32 GMT

Cheers for that David, Will look into ArchiForma

David wrote:
....If you plan to do this sort of thing a lot a parametric scripted GDL object using RULED might be another way to go.

Please excuse my ignorance...Is this part of the ArchiForma package or is it part of AC8.0 ?

Cheers again

Re: Newbie question on roofs

Djordje — Tue, 16 Dec 2003 09:04:02 GMT

"Michael Craig" wrote:
Please excuse my ignorance...Is this part of the ArchiForma package or is it part of AC8.0 ?/quote]

RULED is a GDL command, that you can use in your scripting - which is a little too much for you at this point in time, I suppose.

To try ArchiForma, check http://www.cigraph-store.com.

To Try GDL Toolbox, check http://www.gdltoolbox.com.

Re: Newbie question on roofs

Anonymous — Tue, 16 Dec 2003 09:09:55 GMT

Wish I joined up here months ago...

Thanks for all your help everyone.

Re: Newbie question on roofs

David Collins — Tue, 16 Dec 2003 09:19:48 GMT

Please excuse my ignorance...Is this part of the ArchiForma package or is it part of AC8.0 ?

No, "Ruled" is a GDL script command. If I may be allowed to proselytize a bit, GDL is the basic wonder and glory of ArchiCAD.

Select a simple library object and then go to File/GDL Objects/Open object This will show you the GDL script of that object and will doubtless scare the pants off of you the first time you see it. But it's easy to learn, speaking as a deeply computer code challenged individual, and fun besides.

The whole point is that you write a simple description of an object using variables for key dimensions, materials or even whole alterative variations, which can then be changed on the fly in ArchiCAD.

The roof soffit example here would have parametric variables for the plan dimension, height, slope angle, distance extended from the wall, facia thickness, materials and whatever else you wanted to be able to change. The one script can then produce an infinite variety of similar objects, which can be changed and adjusted in seconds as your design evolves.

Put The GDL Cookbook on your Christmas list.

Re: Newbie question on roofs

David Collins — Tue, 16 Dec 2003 09:24:39 GMT

Very good! Are the egdes of the "hole" by the walls vertical?

Actually, blush, shuffle, I didn't put a hole in the thing at all.
Easy to do, though, with SEO after the slab is rotated into position. That will give you vertical sides on the resulting hole.

Congrats for 5000th message!

What!? No mug!?

Re: Newbie question on roofs

Anonymous — Tue, 16 Dec 2003 09:25:26 GMT

Thanks for the good advice buddy.
Asking Mrs Santa now..

Re: Newbie question on roofs

Anonymous — Tue, 16 Dec 2003 09:28:41 GMT

nice work

IYHO..which is the better package for GDL etc ArchiForma/GDL Toolbox

Had a look online but can't gauge much from that until I try them I guess