Drawing a 1/3 sloped roof in 3D
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Author | Erhan Toker |
| Profession | Architect M.Sc. | |
| Autodesk Authorized Consultant | ||
| Software Specialist | ||
All AutoCAD versions
One of the main problems that new AutoCAD users face while drawing in 3D is drawing triangular prisms. Actually, the problem is that middle top corner of the triangular prism must be calculated. Because of this reason, most of the architects who draw roof and roof sections very successfully on paper cannot draw that easily in AutoCAD.
There are various methods to make this simple drawing. Roof section (triangle) can be drawn in the plan and then it can be rotated 3 dimensionally. Or, roof triangle can be drawn in its exact location by changing UCS, or by simply determining an intersection point where the surfaces and lines meet. In this example, I will use the simplest method which uses a vertical line. Let’s assume that the base of our roof is a 300×150 rectangle (Fig. 1).
Figure 1
As the length of the short edge is 150, then the middle point distance is 75 units. Assuming 33% inclination for the roof, then the height of middle point will be 0.33 x 75 = 24.75 ~ 25. Thus, if we draw a line of 25 units height starting from the middle of the short edge and copy this to the other edge, then it OK. Let’s enter LINE command.
Command: LINE
Specify first point: MID
Specify next point or [Undo]: @0,0,25
And finish the line. While we gave the x and y coordinates of the second point, we gave 25 to z coordinate. By this way, we have drawn a line that is perpendicular to plan surface. Now, let’s copy the line to the middle point of the opposite short edge and obtain the drawing shown in Fig. 2.
Figure 2
From now on, we can draw the side surfaces by using 3DFACE ( 3F ) command (Fig. 3).
Figure 3
Or, you can also STRETCH the top end points 25 units inside, so that you can create an intermediate roof floor (Fig. 4).
Figure 4
As you see, it is as simple as that. We are waiting for a 3D view of an L-shaped roof 
Technorati Tags: AutoCAD, 3D, sloped roof
Bu yazinin Turkce’sini okumak icin basiniz.
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May 19th, 2007 12:45
Dear person,
I know it isn’t a proper reply to what u’ve typed above but I have a question which u probarly already have a answer on. Where can I ask that question since I can’t find any contact details.
Thanks in advance,
Steven.
May 21st, 2007 08:27
Hello Steven,
This blog is not our main bussines. So we are not able to spend time to private mails. You can search our blog, and write your comment below the closest subject for your question. We are trying to answer all questions as soon as possible.
Thanks
May 23rd, 2007 12:26
I hope you feature some new tips and tricks regularly, for beginners. Thanks a lot.
May 28th, 2007 12:27
Please I just want to know if I can study Auto CAD online under your company, when my country is Nigeria, west Africa to be precise.
May 28th, 2007 18:19
Hi Badaru,
Unfortunataly, we haven’t on line classes. Please keep fallowing us.
Thank you
June 25th, 2007 08:38
[…] Drawing a 1/3 sloped roof in 3D article, I have already explained about a useful 3 dimensional technique. And in this article, I […]
September 6th, 2007 09:00
Hi..
I come from Greece and i’m a member of Technical Chamber here, as u maybe there.
Either in A-Lisp or V-Lsp a way to avoid (after ssget ) the x,y coords always on wCS.
I wanna extract them @ an Ascii file (*.txt) just after defining my Girg-UCS and the results to be according to the newly defined Ucs.
MAybe i miss smth on (getvar /cmd : Setvar).
Any idea to skip the problem?
Thks in advance..
September 19th, 2007 09:00
hi,
thnaks for that info, please publish more info about 3d roof, i would gladly appreciate if you post an l shaped or u shaped. Thanks
June 26th, 2008 05:51
your info has always been most helpful. I would aooreciate it very much if you could, at one time, tackle about 3dface application on complex-shaped roof. I’m always having problems how to make it a single-faced surface while having to pick many points on the surface.
thanks a lot & more power to you…