Difference between revisions of "Sandbox:TutorialArchBIM"
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== Annex B IFC and FreeCAD==
== Annex B IFC and FreeCAD==
This chapter looks at how FreeCAD entities come across as IFC entities based on using [http://ifcopenshell.org/ IfcOpenShell] as exporter, and following instructions in [[Arch_Module|Arch] and BIM workbenches
This chapter looks at how FreeCAD entities come across as IFC entities based on using [http://ifcopenshell.org/ IfcOpenShell] as exporter, and following instructions in [[Arch_Module|Arch] and BIM workbenches
We start looking at basic objects like Wall and Structure.
We start looking at basic objects like Wall and Structure.
Revision as of 11:52, 24 September 2018
|Time to complete|
- João Batista Vilanova Artigas
- Pictures by Pedro Kok
- Barão de Jaceguaí, 1151 - Campo Belo, São Paulo-SP (Google) With 30 images
- Completed Freecad model by Wilson, as above image
Goal of this document
- Reflect version updated versions of Freecad (Currently 0.17 / 0.18 )
- Implement a BIM workflow
Currently this document is WORK in Progress
|Yorik van Havre||Main developer of Arch Workbench, and original author of this document|
|Peter Sande||Initiator and co-author of this update. Freecad 0.17 / 0.18 in summer / fall of 2018. The purpose was to seriously try to learn some Freecad Work flows, after playing with it at various points in time over at least the last 5 years.|
|Other||In order to make this a working document we need additional users|
Reference Files used in this tutorial are named as:
at2_Name ──── │ ─── │ │ │ └── SomeMeaningfulName │ └── 4 Char prefix at2_ -> Arch Tutorial 2
All Images not already on wiki are named and uploaded to File:at2_*
- FIXME Comment
- When something needs a closer look, rewrite or other..
- Delete ?
- Something You think should be deleted
This way it is easy to do a quick text search to find topics of concern
This tutorial aims at giving you the basics to work with the Arch Workbench. I will try to make it simple enough so you don't need any previous experience with FreeCAD, but having some experience with 3D or BIM applications will be useful. In any case, you should be prepared to look for yourself for further information about how FreeCAD works on the FreeCAD documentation wiki. The Getting started page is a must read, if you have no previous experience with FreeCAD. Also check our tutorials section, and on youtube you will also find a lot more of FreeCAD tutorials.
The purpose of the Arch Workbench is to offer a complete BIM workflow inside FreeCAD. As it is still under development, don't expect to find here the same tools and level of completion as grown-up commercial alternatives such as Revit or ArchiCAD, but on the other hand, FreeCAD being used in a much bigger scope than these applications, the Arch Workbench greatly benefits from the other disciplines FreeCAD caters to, and offers some features rarely seen in traditional BIM applications.
Here are, for example, a couple of interesting features of FreeCAD's Arch Workbench that you'll hardly find in other BIM apps:
- FIXME The next sentence, is that strictly true? Architectural objects are always solids. From FreeCAD's strong mechanical background, we learned the importance of always working with solid objects. This ensures a much more error-free workflow, and very reliable boolean operations. Since cutting through 3D objects with a 2D plane, in order to extract sections, is also a boolean operation, you can immediately see the importance of this point.
- Architectural objects can always have any shape. No restrictions. Walls don't need to be vertical, slabs don't need to look like slabs. Any solid object can always become any architectural object. Very complex things, usually hard to define in other BIM applications, like a floor slab curving up and becoming a wall (yes Zaha Hadid, it's you we're talking about), present no particular problem at all in FreeCAD.
- The whole power of FreeCAD is at your fingertips. You can design architectural objects with any other tool of FreeCAD, such as the PartDesign Workbench, and when they are ready, convert them to architectural objects. They will still retain their full modeling history, and continue being totally editable. The Arch Workbench also inherits much of the Draft Workbench functionality, such as snapping and working planes.
- The Arch Workbench is very mesh-friendly. You can easily design an architectural model in a mesh-based application such as Blender or SketchUp and import it in FreeCAD. If you took care of the quality of your model and its objects are manifold solid shapes, turning them into architectural objects only requires the press of a button.
At the time of writing, the Arch Workbench, as the rest of FreeCAD, suffers some limitations. Most are being worked on, and will disappear in the future.
- FreeCAD is no 2D application. It is made for 3D. There is a reasonable set of tools for drawing and editing 2D objects with the Draft Workbench and Sketcher Workbench, but it is not made for handling very large (and sometimes badly drawn) 2D CAD files. You can usually successfully import 2D files, but don't expect very high performance if you want to keep working on them in 2D. You have been warned.
- No materials support. FreeCAD will have a complete Material system, able to define very complex materials, with all the goodies you can expect (custom properties, material families, rendering and visual aspect properties, etc), and the Arch Workbench will of course use it when it is ready.
- Very preliminary IFC support. You can already import IFC files, quite reliably, provided IfcOpenShell is installed on your system, but exporting is still not officially supported. This is worked on both by the FreeCAD and IfcOpenShell developers, and in the future we can expect full-powered IFC support.
- Most Arch tools are still in development. That means that automatic "wizard" tools that create complex geometry automatically, such as Arch Roof or Arch Stairs can only produce certain types of objects, and other tools that have presets, such as Arch Structure or Arch Window only have a couple of basic presets. This will of course grow over time.
- Relations between objects in FreeCAD are still not officially available. These, for example the relation between a window and its host wall, are currently implemented in the Arch Workbench with temporary (and therefore somewhat limited) methods. Many new possibilities will arise when this feature will be fully available.
- Units are being implemented in FreeCAD, which will allow you to work with any unit you wish (even imperial units, you guys from the USA can be eternally grateful for this to Jürgen, FreeCAD's godfather and dictator). But at the moment the implementation is not complete, and the Arch workbench still doesn't support them. You must consider it "unit-less". This tutorial uses millimeters as units.
In this tutorial we focus on a BIM oriented approach of using FreeCad. We will use mostly three workbenches: Arch Workbench and BIM, of course, but also Draft, whose tools are all included in Arch, so there is no need to switch workbenches, and Sketcher. Conveniently, can create a custom toolbar in your Arch workbench, with Tools → Customize, and add the tools from the sketcher that you use often.
Instead of creating a project from scratch, let's take an example project to model, it will save us time. We'll use this wonderful house by the famous architect Vilanova Artigas (see a series of pictures by Pedro Kok), as used in the original FreeCAD Arch Tutorial made by Yorik. It is simple, it's a wonderful example of the amazing modernist architecture of São Paulo and the drawings are easily available. You can download drawings in dwg format here. To download the file, you'll need to make a free registration on the website. In alternative, you can grab directly a DXF version here) as a base to build our model. We recommend you to use DXF files instead of DWG, because FreeCAD handle those a lot better. Either way, is your decision.
After downloading and unzipping the file, you'll want to open it with a DWG application such as DraftSight. Alternatively, you can convert it to DXF with a free utility such as the Teigha File Converter. If you have the Teigha converter installed (and its path set in the Arch Preferences settings), FreeCAD is also able to import DWG files directly. But since these files can sometimes be of bad quality and very heavy, it's usually better to open it first with a 2D CAD application and do some cleaning. You should remove all the unnecessary information (title-blocks, page layouts, unused entities, layers, etc.) and organize the drawings in a logical way (sections and elevations aligned with the plan view, and move everything to the (0,0) point). After, you should organize your drawing it in different layers. This will be handy later on if you need to temporarily hide some of its elements to make it easy to model. This is the result when you import to FreeCAD after organizing the DXF in different layers:
Before importing your file, you want to make sure that you have the "Group layers into blocks" option selected. That way, each layer will be grouped as one object, making it easier to work within FreeCAD. To enable that option, you go to Edit > Preferences > Import-Export.
Sometimes when importing DXF files into FreeCAD, the drawing may be out of scale. If that happens, open the DXF on a program such as Draftsight, create a new file and copy/paste all objects. After, just save it as a new DXF file, give it a new name and import it again into FreeCAD.
You could also organize your layers accordingly to the different elements that make up the project. By that I mean you could make a layer for the plan view, another for the south elevation, north elevation, and so on. Feel free to try out and find the way it suits you best or follow the suggestions above if you prefer.
After that, our file can be opened quite efficiently in FreeCAD. Check the different options available in Edit → Preferences →
This is how the file looks after being opened in FreeCAD. In this example, thickness of walls were changed, and a couple of doors that were imported with wrong X scale were flipped, with the Draft Scale tool.
Preparing dwg / dxf Alternative text
For editing and exporting to dxf there are various free tools available. Like said before, one of free tools out there that works fine is [DraftSight by Dassault].
Sometimes, the files you'll use in your daily work can be in different units, since you'll find people with different work methods. If when imported your drawing is e.g. in millimeters and you work in meters, just scale by 1000 (it will scale correctly on all axis), either in FC or other system.
To model your project using plan views, sections and elevations, another method can be used: you can separate your project in several dxf files. This will give you the possibility to rotate the drawings in FreeCAD and position them where you want, independent from one another, as well as to hide part of them while keeping others, if necessary. For that, you'll need to create a .dxf file with the ground floor level, another with the level 1 (in the Artigas house, this corresponds to the studio), the north elevation, south elevation, section AA', BB', and so on. I would recommend you do this after the cleaning/organization process described before, to save you time and effort. Next, import all .dxf files to FreeCAD.
NOTE: Notice that by importing different .dxf drawings to one file, you'll be loading them as separate elements. In some computers, you might experience a slightly lower performance than if you would by importing just one .dxf file with all drawings. However, this option allows you to rotate and move these drawings independently from one another, to hide one elevation while keeping another, and so on. Besides, you can always hide all the imported elements and only keep the drawing you need for a particular operation, which will improve significantly your computer performance, if you have a problem with it. Experiment, give it a try and choose the work method that suits you better.
Tip You may also want to try to import or save the various views into separate FCStd files. This keeps the files smaller and quicker to work with. Naming of files is Your choice, but it is a good idea to use a naming convention.
Example files produced at various levels of this tutorial will be placed on GitHub FreeCad Examples at2_Examples
For dxf files, they are placed in a directory named ./ref/dxf below the project directory. If You want to skip this step, the imported dxf files can be found here.
Start with importing and placing the Plan View.
If you don't have the option "Group layers into blocks" selected, as suggested before, when importing your DXF file your geometry will show up as several edges. This can make FreeCAD run slower. However, depending on what you want to do, you may want to have your object divided in edges instead of grouped into blocks. Either way, make a good habit of organizing your file by compiling these edges into a Group. The Group can be created before or after importing. Once you have imported your .dxf file into FreeCAD, just select all the imported edges and ‘drag/drop’ them into the Group.
Now, do the same for all the other views. Next in this document, we will place the various views at their location, elevation and rotation, according to our ArchAxisSystem. Before Rotating and placing the various views, we need to do some planning.
FreeCad dxf import treats everything as Edges or Shapes, This is generally ok for lines. Bad for circles. No easy way to find Center.
There are no set rules for how to organize Your work. Having said that, planning always pays off. The following list contains some points to get You started.
- Define a project origin
- Define an Arch Axis System
- Make appropriate as needed workplanes
- Name everything something logical
- Work with partial files
- Name Your various files logically
- Define a naming convention for files, or You may soon get lost
Most of the guidelines or rules proposed here, are common to any CAD system.
As a minimum
A defined project zero / origin – with local x,y,z coordinates 0,0,0 shall be defined and used throughout the project.
For further planning of File structure jump to the IFC section of this document
In this project we will follow Axis system of downloaded original Drawings.
Defining the project origin at intersection of Axis 01 & D. By our convention this equals SouthWest corner of model. Observe that the axis pass through the center of walls.
When modeling any Architectural model, You will most certainly want to split into separate files. By the way, partial IFC files seem to be the trend at the moment. Mainly split by discipline. The split can be by discipline or other. It is good practice to have a common origin and orientation across these models (files). This makes it easy to copy paste groups between files as needed. It also provides a good basis for several people to work on the project as needed.
For reference we have made the assumption that global Y-axis equals North.
Defining the Arch Axis System
We now want to make an ArchAxisSystem for reference when modeling our building. The result will look something like this:
To find the data for making the ArchAxisSystem study the Plan View of the imported dwg. This will show You Axis and Dimensions.
Alternatively measure between the various axis in Freecad. This can be done in several ways, using the part workbench Measure linear, Tape Measure works fine for this.
By Studying original dxf files.
When measuring distance between axis 10 and 11, we find Delta X = 3.6246 Index 11 above, has been adjusted since if possible, we like to work with ‘round’ figures.
We also observe that the Eastern Columns are tangent to East wall of Studio. This is not good practice.
Will reduce the distance between axis 10 and 11. Will try with 3550mm.
Arch axis X
Now, let’s make the Axis along global X: The Freecad Command is Arch Axis
Image shows Data and labels Used.
Image shows Data and labels Used.
Observe the 270deg rotation and offset of placement to get labels to get desired layout.
Combining to Axis System
Arch AxisSystem is used to combine the x and y Arch Axis into an Arch Axis system.
If You save Your AxisSystem to a file, without any other geometry, it does not seem to open as the first file. FreeCad simply Crashes. However, not such a big deal, because if You open another file containing geometry first, then You are able to open the file containing only the AxisSystem without any problem. Strange??
Axis System Forum posts
Placing and rotating 2d Views
In order to place 2d views in 3d, we need to prepare some helper objects. In FreeCad we have several ways we can set-up, store and name Working Planes . We can name these and store them by using a WorkingPlaneProxy object.
You should end up with something looking like this
By placing and rotating the imported 2d view, You will have a good way of checking their consistency.
Adding reference planes
After starting to look at #WokFeature_Approach. Think this is a great way of implementing working planes.
Walls can be:
- Inner / Outer, Structural / Non Structural
- Walls should contain openings for doors, windows, or other
Like most Arch objects, walls can be built upon a big variety of other objects: lines, wires (polylines), sketches, faces or solid (or even on nothing at all, in which case they are defined by height, width and length). The resulting geometry of the wall depends on that base geometry, and the properties you fill in, such as width and height. As you might guess, a wall based on a line will use that line as its alignment line, while a wall based on a face will use that face as its base footprint, and a wall based on a solid will simply adopt the shape of that solid. This allows about any shape imaginable to become a wall.
There are different possible strategies to build walls in FreeCAD. One might want to build a complete "floor plan" with the sketcher, and build one, big, wall object from it. This technique works, but you can only give one thickness for all the walls of the project. Or, you can build each piece of wall from separate line segments.
Delete ? Or, this is what we will do here, a mix of both: We will build a couple of wires on top of the imported plan, one for each type of wall: Have found that editing a wire is currently more cumbersome than editing a line
The RED lines that will become concrete walls (a pictures search of the house can help you to see the different wall types), the GREEN ones are the exterior brick walls, and the BLUE ones will become the inner walls. Lines are passed through the doors, because doors will be inserted in the walls later, and will create their openings automatically. Walls can also be aligned left, right or centrally on their baseline, so it doesn't matter which side you draw the baseline. Take care on avoiding intersections as much as You can. Our model will be cleaner that way. This will save us some headache later, for example if we export our work to other applications, that might not like it.
When this is done, place all those lines in a new group if you want, select each line one by one, and press the Arch Wall tool to build a wall from each of them. You can also select several lines at once. After doing that, and correcting widths (exterior walls are 25cm wide, inner walls are 15cm wide) and some alignments, we have our walls ready:
You should now have a model resembling something like this.
Grouping of Your various objects can come in handy at a later stage. How to Group Your model is Your choice.
Here is an example:
Note, Baselines for creating walls have also been grouped
Walls have been grouped like:
Have found the KISS principle (Keep It Simple & Stupid) is a good approach.
- Using lines as a base for walls works fine.
- They are easy to move and change.
- When editing the line defining a wall, the wall will update
- At a later stage You can always join them as needed.
Saving Your walls to a new file at this stage can be a good idea.
One way of doing this is creating a new file.
- Activate Your file containing Walls You have just modelles
- Mark the groups You want in Your 'wallModelFile'
- Choose Edit->Copy
- Activate Your new file
- Choose Edit->Paste, or Ctrl+v
- Save Your new file to something meaningful for Your workflow.
- Suggestion At2_Walls_Initial
With this work flow:
- You will be able to go back to Your starting point if anything goes wrong
- You will be building a model consisting of several partial models
- This is a good way of keeping file size down. You can work on one particual 'sub model' without caring about the overhead of the total model.
- You will generate a lot of files
- Be particular how You name Your various files, or get lost.
So, how to organize? Believe the main differing factor is Structural / Non Structural Next Level Inner / Outer
Curtain Walls are always Non Structural
Joining Wall segments
All Arch objects have a great feature: you can add one to another. Doing that will unite their geometries, but they are still editable independently after. To add one of our crossing walls to the other, just select one, CTRL + select the other, and press the Arch Add tool:
On the left are the two intersecting walls, on the right the result after adding one to the other.
Something is important to consider already. As you can see, in FreeCAD, everything is parametric: Our new "united" wall is made from two walls, each based on a baseline. When you expand them in the tree view, you can see all that chain of dependencies. As you can imagine, this little game can quickly become very complex. Furthermore, if you already know how to work with the sketcher, you might have wanted to draw the baselines with constrained sketches. This whole complexity has a cost: it raises exponentially the number of calculations that FreeCAD has to perform to keep your model geometry up to date. So, think about it, don't add unnecessary complexity when you don't need it. Keep a good balance between simple and complex objects, and keep these for the cases where you really need them.
For example, I could have drawn all my baselines above without caring about what crosses what, and fix things with the Arch Add tool later. But I would have raised much the complexity of my model, for no gain at all. Better make them correct right from the start, and keeping them as very simple pieces of geometry.
Now that our walls are okay, we need to raise their height, until they intersect the roof. Then, since the wall object still cannot be cut automatically by roofs (this will happen some day, though), we will build a "dummy" object, that follows the shape of the roof, to be subtracted from our walls.
First, by looking at our 2D drawings, we can see that the highest point of the roof is 5.6m above the ground. So let's give all our walls a height of 6m, so we make sure they will be cut by our dummy roof volume. Why 6m and not 5.6m? You may ask. Well, if you already worked with boolean operations (additions, subtractions, intersections), you must already know that these operations usually don't like much "face-on-face" situations. They prefer clearly, frankly intersecting objects. So by doing this, we keep on the safe side.
To raise the height of our walls, simply select all of them (don't forget the one we added to the other) in the tree view, and change the value of their "height" property.
Before making our roof and cutting the walls, let's make the remaining objects that will need to be cut: The walls of the above studio, and the columns.
Before establishing the elevation, take a look at the base 2d drawings. Something is wrong in paradise.
We will set top of Studio floor (Slab) to 2425,0 mm
This can be done in many ways. Probably the easiest is to draw the baseline for studio wall on top of the Plan View, and moving it up 2425mm.
The walls of the studio are made the same way as we did, on the superior floor plan, but they will be raised up to level 2.6m. So we will give them the needed height so their top is at 6m too, that is, 3.4m. Once this is done, let's move our walls up by 2.6m: Select them both, put yourself in frontal view (View → Standard Views → Front), press the Draft Move button, select a first point, then enter 0, 2.6, 0 as coordinates, and press enter. Your objects now have jumped 2.6m high:
The Draft objects, and most Arch objects too, obey to a Draft system called working planes. This system defines a 2D plane where next operations will take place. If you don't specify any, that working plane adapts itself to the current view. This is why we switched to frontal view, and you see that we indicated a movement in X of 0 and in Y of 2.6. We could also have forced the working plane to stay on the ground, by using the Draft SelectPlane tool. Then, we would have entered a movement of X of 0, Y of 0 and Z of 2.6.
Now let's move our walls horizontally, to their correct location. Since we have points to snap to, this is easier: Select both walls, press the Draft Move tool, and move them from one point to the other:
Finally, I changed the color of some walls to a brick-like color (so it's easier to differentiate), and made a small correction: Some walls don't go up to the roof, but stop at a height of 2.60m. I corrected the height of those walls.
We will show two different approaches to creating the Subtraction Volume, one drawing on 3d SouthEleveation, second drawing on plan View, rotating and moving.
In this Approach we will draw and extrude with correct 3d location
- Set Your WorkingPlane to Front
- Draw lines following the lower edge of roof
- Use DraftTrimex to extend and join lines so they form a closed loop
- Make sure the cutting volume we want to produce extends the bounds of what we want to cut
- Convert lines to closed dwire
- Extrude to a dimension larger than total width of elements we want to cut
- If needed, set workplane to top view, move to top view and move extrusion so it covers the with of the building
Now it is time to build our subtraction volume. The easiest way will be to draw its profile on top of the section view. Then, we will rotate it and place it at its correct position. See why I placed the sections and elevations like that before beginning? It will be very handy for drawing stuff there, then moving it to its correct position on the model.
Let's draw a volume, bigger than the roof, that will be subtracted from our walls. To do that, I drew two lines on top of the base of the roof, then extended them a bit further with the Draft Trimex tool. Then, I drew a wire, snapping on these lines, and going well above our 6 meters. I also drew a blue line on the ground level (0.00), that will be our rotation axis.
Now is the tricky part: We will use the Draft Rotate tool to rotate our profile 90 degrees up, in the right position to be extruded. To do that, we must first change the working plane to the YZ plane. Once this is done, the rotation will happen in that plane. But if we do like we did a bit earlier, and set our view to side view, it will be hard to see and select our profile, and to know where is the basepoint around which it must rotate, right? Then we must set the working plane manually: Press the Draft SelectPlane button (it is in the "tasks" tab of the tree view), and set it to YZ (which is the "side" plane). Once you set the working plane manually, like that, it won't change depending on your view. You can now rotate your view until you have a good view of all the things you must select. To switch the working plane back to "automatic" mode later, press the Draft SelectPlane button again and set it to "None".
Now the rotation will be easy to do: Select the profile, press the Draft Rotate button, click on a point of the blue line, enter 0 as start angle, and 90 as rotation:
Now all we need to do it to move the profile a bit closer to the model (set the working plane to XY if needed), and extrude it. This can be done either with the Part Extrude tool, or Draft Trimex, which also has the special hidden power to extrude faces. Make sure your extrusion is larger than all the walls it will be subtracted from, to avoid face-on-face situations:
Common to both approaches
Now, here comes into action the contrary of the Arch Add tool: Arch Remove. As you might have guessed, it also makes an object a child of another, but its shape is subtracted from the host object, instead of being united. So now things are simple: Select the volume to subtract (I renamed it as "Roof volume to subtract" in the tree view so it is easy to spot), CTRL + select a wall, and press the Arch Remove button. You'll see that, after the subtraction happened, the volume to subtract disappeared from both the 3D view and the tree view. That is because it has been marked as child of the wall, and "swallowed" by that wall. Select the wall, expand it in the tree view, there is our volume.
Now, select the volume in the tree vieew, CTRL + select the next wall, press Arch Remove. Repeat for the next walls until you have everything properly cut:
Arch objects that support such additions and subtractions (all of them except the "visual" helper objects such as the axes) keep track of such objects by having two properties, respectively "Additions" and "Subtractions", that contain a list of links to other objects to be subtracted or added. A same object can be in the lists of several other objects, as it is the case of our subtraction volume here. Each of the fathers will want to swallow it in the tree view, though, so it will usually "live" in the last one. But you can always edit those lists for any object, by double-clicking it in the tree view, which in FreeCAD enters edit mode. Pressing the escape key exits edit mode.
Work flow note:
It is probably a good Idea to store Your RoofCutVolume in a separate file for later
Looking at bathroom geometry, something is not clear.
Generally defined as Slabs
To start with, Create a Group for Floors
- Groups are created by ->
- Groups are created at the position of Your Cursor, meaning You may also create a Group as a subgroup.
- You may also move a goup to another group by Drag & Drop
- Groups are Renamed by hitting , or right click a group and select , or
By setting our Group to FloorSlabs, we insure that what we create from now on will be located in this group. (if You forget this step, You can always Drag&Drop entities to this group later)
In practice the inner walls (non structural) will probably be placed above the FloorSlabs. For tutorial purposes, we will assume that all walls and columns penetrate the FloorSlabs
Next set the desired snap settings. Especially for new users, conflicting snap settings are a cause of frustration.
In image above, we have the following snap settings active:
Also make sure WorkingPlane is set to Top.
Now, draw a closed loop to make FloorSlab. This can be done either with lines, or with Draft Dwire. This is Your choice.
Remember that single lines are easier to edit than a dWire, so in many cases it is more efficient to draw single lines, edit, join and add to them, before Joining them to create a dwire.
You Should now have something Like image above. Observe we have changed the Label to FloorSlab, and ifcRole to Slab (We don't want our floor to be exported as a Column)
In order to Cut FloorSlab with Our walls, without walls disappearing, we need to first make a Copy of them.
Select the walls You want to cut the FloorSlab with , and Copy/Paste them.
We can see that Copied walls have been created in the FloorSlab Group
Now select the cutting objects, and the object to be cut (Parent) as the last one, and Press thebutton
Next we need to do the same with the Columns. But first we have to model them.
If you have started with making the Arch Grid, tis is a piece of cake. All columns are at intersections of grid lines.
When measuring the columns, we find they are ø300mm. Probably they could be thinner, but we will stick with original design here.
Probably the easiest is to use a circle with R=150 as base for columns. then extrude to 6000mm.
Adjust the height of Columns under Studio Slab.
We have Labeled the Columns according to the grid-lines the are placed on.
Next Cut the columns going up to the roof, using the same procedure and cutting object as You used whe cutting the walls previously.
Making the roofs
Starting With outer Beams
Looking at the section of the Outer Beams, we can see it is aligned with outer wall. At least in some countries with rougher weather conditions this would be bad practice. Will increase width to 200mm, and have the beam extend 50mm outside the wall.
Showing Section of Beam with DripNose
Created as separate extrudes, added to BuildingPart
Struggling with determining best way to model..
Tried using Part Boolean Cut For the roof canopy...
The cut results in error when exporting
Roof Center Slab
Choose Edit->Copy (Ctrl+C)
Make a new file
Choose Edit->Paste (Ctrl+V)
Make Your workplane perpendicular to the shapes. This can be done in many ways.
Tip If You made the slab by extrude from Front Plane, it will need to be moved by the global Y-axis. If You move the extrusion, by means of Draft->Move, this will lead to wrongly placed geometry when exporting to IFC. For IFC export to work correct, You need to also move the underlying or defining geometry.
Look at Arch Component
Some posts relating to issue and resolution
Mods to roof
Correct supporting wall
If You cut the wall (RED in image above), we now discover that this is supporting The Roof Center Slab.
This gives us a great opportunity test editing this wall with Arch remove command FIXME Think the doc needs some updating
In order to add some flexibility beneath Roof slabs, we have made them as image above.
This means modifying cuts to inner walls and adding a suspended ceiling.
We will also need to add some covering to the Roof Slabs
- Shorten supporting wall (Red in above image)
- First remove 'cut'
- Adjust height of wall
- Center The slab on supporting wall
- Adjust and construct link between Inner wall and roof of Dormer
- The inner wall (Green) needs to be combined with the Roof of the Dormer
The two highlighted inner walls should probably extend to form the side walls of Dormer
, Go to Selection --> Gets You to Component Structure / Edit
Make a plane for the two half of the Roof using
Try to use Work features, installed as WorkBench
Also try Macro_Align_View_to_Face
Started Playing with this.. First interesting feature.. If You select An Arch Axis -> place point at extreme, it will place points at all ends of all the selected axis
View image, by selecting the X-Axis System and hitting WorkFeature->Create Points at Line Extreme. Thew workFreature macro will create workpoints at end of all defined lines in ArchAxis. In this case AxesX
- Planes created with WorkFeature are able to set workplane in draft. (Only tested 0.18)
- Planes created this way can be named as all other FC features
- Macro also contains Align View to Workplane feature
When Building part is exported to IFC, it creates 4xIFCproxyElements, and a parent Beam object
Modeling the Stairs may be done in several ways.
Here we will model them the traditional way, but feel free to experiment with the Automated functionality presented in Arch Stairs
Inner or outer
Inner or Outer
IFC and BIM
Building Information Modelling (BIM) is a very broad term that describes the process of creating a digital model of a building.
BEP ( BIM Execution Plan)
All BIM projects should have a BEP ( BIM Execution Plan)
As a minimum
Origin point, northing, and elevation
One of the simplest yet most critical aspects of good project coordination is the establishment of a common or shared base point for all BIM data to follow. It is also essential to have a common site base point as the data is used through the life-cycle of the building.
- IFC - Where it all started - The End of Babel - Part 1/2
- Planning and Standards by U.S. General Services Administration
- FC4 - is it ready yet?
- BimServer Center
- Bimsync by Catenda (Norwegian company, dedicated to standards)
- Open BIMserver
- Allplan BimPlus (a Nemetschek company)
IFC round tripping
Aim is to also test round tripping, exporting IFC from FreeCAD and importing same file for comparison.
BIM requirements by stakeholders
In the UK, the Government Construction Strategy published in May 2011, stated that the '...government will require fully collaborative 3D BIM (with all project and asset information, documentation and data being electronic) as a minimum by 2016'. This represents a minimum requirement for Level 2 BIM on centrally-procured public projects.
Relevant Forum Posts
Have started gathering some forum post that might be relevant for the TutorialArchBim
- FreeCAD posts from Yorik's blog
- reorder objects
- Why Switch from FreeCAD to Blender
- Noob. Architecture best practices, workflow and other questions
- BIM Workbench
- controls the color of objects in a IFC?
- An arch project Postby sergiobini Thu Jul 26, 2018 12:18 pm
- Flameshot: Fantastic Screenshot software for Linux users
- Design for a staircase
- BIM / Arch tutorials
- Presenting FreeCad
- Document tree display
- Windows macro, various
- Reinforcement WB
General building terminology
This paragraph or chapter will contain Ideas for improvements, expansion and view, based on communication from participants
This is where we have temporarily stored snippets of text, that maybe should be placed somewhere in the document
Noob. Architecture best practices, workflow and other questions Quoting forum post:
At first, I didn't understand correctly the snapping tools. The snaps seemed random, but thanks to Regis tutorials on Youtube (cheers mate!!) I started over, using the snaps correctly (almost). This second time, by distraction, I added walls to each other and now I got stuck. I need to subtract a volume because some walls intersect a small slab, and when I do it, nothing happens. At first, they were all disappearing; now, not even that. Now, I know the tutorial recommends that we shouldn't add to much stuff to each other in order to avoid unnecessary complexity, but since it is also a BIM app, shouldn't complexity be part of it? I mean, shouldn't walls, if not adding to one another, at least merge directly to each other, like in Revit for example?
Remember this was an issue for me to, and probably is for most people trying to learn FreeCAD.
Needs to be put somewhere in tutorial. Among others, have a look at Regis Snapping
The Snap Tools are one of Your best friends. However, remember that having all set will in most cases result in an illogical condition. Only leave on the snaps You want.
If You have struggled with this when learning FreeCAD, take some comfort in that You are not the only one
Customizing Arch WorkBench
This is an example "customized" Arch workbench:
In this tutorial, we will model the house in 3D, based on the 2D drawings we will download from the net, and extract from it 2D documents, such as plans, elevations and sections.
make list of common abbreviations
BEP | BIM Execution Plan
References & Links
Reference any input from users or outside sources
[File_Format_FCStd| File FormatFCStd
Document Draft Snippets
Customizing Arch WorkBench
Virtual Design and Construction seems to be the next Buzz word after BIM.
import sys for p in sys.path: print p
No success so far
sudo apt-get install git cmake gcc g++ libboost-all-dev libicu-dev
compile OCE yourself (note that the build takes a long time):
$ sudo apt-get install libftgl-dev libtbb2 libtbb-dev libgl1-mesa-dev libfreetype6-dev $ git clone https://github.com/tpaviot/oce.git $ cd oce $ mkdir build && cd build $ cmake .. $ make -j $ sudo make install
IFC openshell Linux
import sys >>> for p in sys.path: ... print p ... /usr/lib/freecad-daily/Mod/Drawing /usr/lib/freecad-daily/Mod/Inspection /usr/lib/freecad-daily/Mod/Idf /usr/lib/freecad-daily/Mod/AddonManager /usr/lib/freecad-daily/Mod/Robot /usr/lib/freecad-daily/Mod/Arch /usr/lib/freecad-daily/Mod/Part /usr/lib/freecad-daily/Mod/Path /usr/lib/freecad-daily/Mod/Mesh /usr/lib/freecad-daily/Mod/Raytracing /usr/lib/freecad-daily/Mod/Material /usr/lib/freecad-daily/Mod/Plot /usr/lib/freecad-daily/Mod/Complete /usr/lib/freecad-daily/Mod/Tux /usr/lib/freecad-daily/Mod/TechDraw /usr/lib/freecad-daily/Mod/Import /usr/lib/freecad-daily/Mod/Test /usr/lib/freecad-daily/Mod/Draft /usr/lib/freecad-daily/Mod/Points /usr/lib/freecad-daily/Mod/Start /usr/lib/freecad-daily/Mod/Spreadsheet /usr/lib/freecad-daily/Mod/Fem /usr/lib/freecad-daily/Mod/OpenSCAD /usr/lib/freecad-daily/Mod/MeshPart /usr/lib/freecad-daily/Mod/Web /usr/lib/freecad-daily/Mod/Ship /usr/lib/freecad-daily/Mod/Measure /usr/lib/freecad-daily/Mod/PartDesign /usr/lib/freecad-daily/Mod/Surface /usr/lib/freecad-daily/Mod/Image /usr/lib/freecad-daily/Mod/Show /usr/lib/freecad-daily/Mod/ReverseEngineering /usr/lib/freecad-daily/Mod/Sketcher /usr/lib/freecad-daily/Mod /usr/lib/freecad-daily/lib64 /usr/lib/freecad-daily/lib /usr/lib/freecad-daily/Ext /home/peter /usr/lib/python2.7 /usr/lib/python2.7/plat-x86_64-linux-gnu /usr/lib/python2.7/lib-tk /usr/lib/python2.7/lib-old /usr/lib/python2.7/lib-dynload /usr/local/lib/python2.7/dist-packages /usr/lib/python2.7/dist-packages /usr/lib/freecad-daily/Macro /usr/lib/freecad/lib /home/peter/.FreeCAD/Macro /home/peter/.FreeCAD/Macro/WorkFeature/WF_2015.py /home/peter/.FreeCAD/Macro/WorkFeature/ParCurve/WF_ObjParCurve_2016.py /home/peter/.FreeCAD/Macro/WorkFeature/ParCurve/WF_ObjParCurveEdit_2016.py >>>
import sys sys.path.append("/usr/lib/python2.7/site-packages")
peter@peter-HP-Z400-Workstation:~/.FreeCAD/Macro$ sudo rsync -azv /home/peter/Downloads/ifcopenshell /usr/local/lib/python2.7/site-packages/ [sudo] password for peter: sending incremental file list ifcopenshell/ ifcopenshell/__init__.py ifcopenshell/_ifcopenshell_wrapper.so ifcopenshell/entity_instance.py ifcopenshell/file.py ifcopenshell/guid.py ifcopenshell/ifcopenshell_wrapper.py ifcopenshell/geom/ ifcopenshell/geom/__init__.py ifcopenshell/geom/app.py ifcopenshell/geom/main.py ifcopenshell/geom/occ_utils.py sent 19,305,512 bytes received 218 bytes 7,722,292.00 bytes/sec total size is 49,071,231 speedup is 2.54
Ended up placing ifcopenshell in ... dist-packages
Annex B IFC and FreeCAD
We start looking at basic objects like Wall and Structure.
Annex D IFC PlusPlus
New try with Ubuntu 18.04 LTS
Download Stretch--ifcplusplus.sh save to Your Home dir.
- Make executeble
- Open Terminal
- chmod u+x Stretch--ifcplusplus.sh
- Run the file
SimpleViewerExampled: error while loading shared libraries: libcarved.so: cannot open shared object file: No such file or directory
yorik wrote: Thu Aug 30, 2018 6:27 pm do you have a libcarved.so together with the SimpleViewerExample executable in Release subfolder?
Tried this script with Ubuntu 16.04 LTS, got all kinds of errors. Mostly Cmake wrong version. See ifcPlusPlus
/usr/bin$ ls -l freec* lrwxrwxrwx 1 root root 26 aug. 19 21:25 freecad -> ../lib/freecad/bin/FreeCAD lrwxrwxrwx 1 root root 29 aug. 19 21:25 freecadcmd -> ../lib/freecad/bin/FreeCADCmd lrwxrwxrwx 1 root root 35 aug. 23 04:16 freecadcmd-daily -> ../lib/freecad-daily/bin/FreeCADCmd lrwxrwxrwx 1 root root 32 aug. 23 04:16 freecad-daily -> ../lib/freecad-daily/bin/FreeCAD -rwxr-xr-x 1 root root 717 aug. 23 01:03 freecad-daily-thumbnailer -rwxr-xr-x 1 root root 699 aug. 19 20:29 freecad-thumbnailer
Data directories FreeCad
/usr/share$ tree -d ./freecad ./freecad ├── examples ├── Gui │ └── Stylesheets │ └── images └── Mod -> ../../lib/freecad/ModUser Data in
seems to be shared with FreeCad-Daily
.FreeCAD ├── Macro ├── Macros └── Mod ├── assembly2 │ ├── docs │ ├── Gui │ │ └── Resources │ │ ├── icons │ │ └── ui │ └── tests ├── BIM │ ├── icons │ └── utils ├── flamingo │ ├── dialogs │ ├── examples │ ├── icons │ ├── shapes │ │ ├── ballValves │ │ └── butterflyValves │ ├── tables │ └── tutorials ├── FreeCAD_assembly2 │ ├── docs │ ├── Gui │ │ └── Resources │ │ ├── icons │ │ └── ui │ └── tests └── timber └── icons
link to Mod
/usr/lib$ tree -d ./freecad ./freecad ├── bin ├── Ext │ └── freecad ├── lib └── Mod ├── AddonManager ├── Arch │ ├── Dice3DS │ ├── Presets │ └── Resources │ └── icons ├── Complete │ └── Resources │ └── icons ├── Draft │ └── Resources │ └── icons ├── Drawing │ ├── Resources │ │ └── icons │ └── Templates ├── Fem │ ├── femcommands │ ├── femguiobjects │ ├── feminout │ ├── femmesh │ ├── femobjects │ ├── femresult │ ├── femsolver │ │ ├── calculix │ │ ├── elmer │ │ │ └── equations │ │ ├── fenics │ │ └── z88 │ ├── femtest │ │ └── testfiles │ │ ├── ccx │ │ ├── elmer │ │ └── mesh │ ├── femtools │ └── Resources │ ├── icons │ └── ui ├── Idf │ └── Idflibs ├── Image │ └── Resources │ └── icons ├── Import ├── Inspection │ └── Resources │ └── icons ├── Material │ ├── FluidMaterial │ └── StandardMaterial │ └── Tools ├── Measure ├── Mesh │ └── Resources │ └── icons ├── MeshPart ├── OpenSCAD │ ├── ply │ └── Resources │ └── icons ├── Part │ ├── AttachmentEditor │ ├── BOPTools │ ├── CompoundTools │ └── Resources │ └── icons ├── PartDesign │ ├── fcgear │ ├── PartDesignTests │ ├── Resources │ │ └── icons │ ├── Scripts │ └── WizardShaft ├── Path │ ├── PathScripts │ │ └── post │ ├── PathTests │ └── Resources │ └── icons ├── Plot │ ├── plotAxes │ ├── plotLabels │ ├── plotPositions │ ├── plotSave │ ├── plotSeries │ ├── plotUtils │ └── resources │ └── icons ├── Points │ └── Resources │ └── icons ├── Raytracing │ ├── Resources │ │ └── icons │ └── Templates ├── ReverseEngineering │ └── Resources │ └── icons ├── Robot │ ├── Lib │ │ └── Kuka │ └── Resources │ └── icons ├── Ship │ ├── resources │ │ ├── examples │ │ └── icons │ ├── shipAreasCurve │ ├── shipCapacityCurve │ ├── shipCreateLoadCondition │ ├── shipCreateShip │ ├── shipCreateTank │ ├── shipCreateWeight │ ├── shipGZ │ ├── shipHydrostatics │ ├── shipLoadExample │ ├── shipOutlineDraw │ └── shipUtils ├── Show ├── Sketcher │ ├── ProfileLib │ └── Resources │ └── icons ├── Spreadsheet │ └── Resources │ └── icons ├── Start │ ├── Resources │ │ └── icons │ └── StartPage │ └── images ├── Surface ├── TechDraw │ ├── LineGroup │ ├── PAT │ ├── Patterns │ ├── Resources │ │ ├── fonts │ │ └── icons │ ├── TDTest │ └── Templates ├── Test │ └── Resources │ └── icons ├── Tux └── Web └── Resources └── icons
Data directories FreeCad-Daily
/usr/share$ tree -d ./freecad-daily ./freecad-daily ├── examples ├── Gui │ └── Stylesheets │ └── images_dark-light └── Mod ├── Arch │ ├── Presets │ └── Resources │ └── icons ├── Complete │ └── Resources │ └── icons ├── Draft │ └── Resources │ └── icons ├── Drawing │ ├── Resources │ │ └── icons │ └── Templates ├── Fem │ └── Resources │ └── icons ├── Image │ └── Resources │ └── icons ├── Import │ └── DxfPlate ├── Inspection │ └── Resources │ └── icons ├── Material │ ├── FluidMaterial │ └── StandardMaterial │ └── Tools ├── Mesh │ └── Resources │ └── icons ├── OpenSCAD │ └── Resources │ └── icons ├── Part │ └── Resources │ └── icons ├── PartDesign │ └── Resources │ └── icons ├── Path │ └── Resources │ └── icons ├── Plot │ └── resources │ └── icons ├── Points │ └── Resources │ └── icons ├── Raytracing │ └── Resources │ └── icons ├── ReverseEngineering │ └── Resources │ └── icons ├── Robot │ ├── Lib │ │ └── Kuka │ └── Resources │ └── icons ├── Ship │ └── resources │ └── icons ├── Sketcher │ └── Resources │ └── icons ├── Spreadsheet │ └── Resources │ └── icons ├── Start │ ├── Resources │ │ └── icons │ └── StartPage ├── TechDraw │ ├── LineGroup │ ├── PAT │ ├── Patterns │ ├── Resources │ │ ├── fonts │ │ └── icons │ └── Templates ├── Test │ └── Resources │ └── icons └── Web └── Resources └── icons
/usr/lib$ tree -d ./freecad-daily ./freecad-daily ├── bin ├── Ext │ └── freecad ├── lib └── Mod ├── AddonManager ├── Arch │ └── Dice3DS ├── Complete ├── Draft ├── Drawing ├── Fem │ ├── femcommands │ ├── femguiobjects │ ├── feminout │ ├── femmesh │ ├── femobjects │ ├── femresult │ ├── femsolver │ │ ├── calculix │ │ ├── elmer │ │ │ └── equations │ │ ├── fenics │ │ └── z88 │ ├── femtest │ │ └── testfiles │ │ ├── ccx │ │ ├── elmer │ │ └── mesh │ ├── femtools │ └── Resources │ └── ui ├── Idf │ └── Idflibs ├── Image │ └── ImageTools ├── Import ├── Inspection ├── Material ├── Measure ├── Mesh ├── MeshPart ├── OpenSCAD │ └── ply ├── Part │ ├── AttachmentEditor │ ├── BOPTools │ └── CompoundTools ├── PartDesign │ ├── fcgear │ ├── PartDesignTests │ ├── Scripts │ └── WizardShaft ├── Path │ ├── Images │ │ ├── Ops │ │ └── Tools │ ├── PathScripts │ │ └── post │ └── PathTests ├── Plot │ ├── plotAxes │ ├── plotLabels │ ├── plotPositions │ ├── plotSave │ ├── plotSeries │ └── plotUtils ├── Points ├── Raytracing ├── ReverseEngineering ├── Robot ├── Ship │ ├── resources │ │ └── examples │ ├── shipAreasCurve │ ├── shipCapacityCurve │ ├── shipCreateLoadCondition │ ├── shipCreateShip │ ├── shipCreateTank │ ├── shipCreateWeight │ ├── shipGZ │ ├── shipHydrostatics │ ├── shipLoadExample │ ├── shipOutlineDraw │ └── shipUtils ├── Show ├── Sketcher │ └── ProfileLib ├── Spreadsheet ├── Start │ └── StartPage ├── Surface ├── TechDraw │ └── TDTest ├── Test ├── Tux └── Web