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Dirk Olbrich
89 lines
3.2 KiB
ReStructuredText
89 lines
3.2 KiB
ReStructuredText
Creating an IFC model
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=====================
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We're going to create a new native IFC model from scratch, starting from a
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single shape, up to a simple building.
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A BIM model is not just a 3D format. This means that you cannot just load any 3D
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model, and press a "Save as IFC" button. In fact, 3D is optional and you
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can have a large IFC model storing work schedules, cost rates, asset registers
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and more, and absolutely no 3D geometry at all.
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However, in these tutorials, we will focus on basic 3D geometry. At a minimum,
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you will need to categorise your 3D elements (such as "Wall", "Column",
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"Window", etc), and give them a location (such as "Level 01" of a building).
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Creating a single object
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------------------------
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In the **Properties** panel in the bottom right, activate the icon for the
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**Scene Properties** tab, and find the **IFC Project** subpanel. Click on
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**Create Project** to create a blank IFC project.
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.. image:: images/create-project.png
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In the top right **Outliner** panel, you will see a hierarchy of spaces that has
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been automatically created for you. This hierarchy is known is the **Spatial
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Tree**. The Camera, Cube, and Light come with a fresh new Blender session by
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default, and are not part of your IFC project.
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.. image:: images/default-spatial-tree.png
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Any Blender object that you want to be part of IFC project must be converted
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into a IFC object by assigning a category. This category is known as the **IFC
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Class**.
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.. seealso::
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Use the `IFC Class search tool
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<https://blenderbim.org/search-ifc-class.html>`__ to help choose an **IFC
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Class**!
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Select only the default Blender Cube (selected objects are highlighted in
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orange, careful not to select anything else!), switch to the **Object
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Properties** tab, and find the **IFC Class** panel. Let's pretend our Cube is a
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column, so select **IfcColumn** from the **Class** drop-down, and press **Assign
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IFC Class**.
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.. image:: images/assign-class.png
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.. tip::
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There are no restrictions on which **IFC Class** you can choose regardless of
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the shape of your object. You can have a monkey-shaped wall if you want!
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All IFC objects must also belong inside the **Spatial Tree**. In the
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**Outliner** panel, you can drag and drop your newly created **IfcColumn/Cube**
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inside the **IfcBuildingStorey/Ground Floor**. Wasn't that simple?
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.. image:: images/drag-drop-outliner-tree.png
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Go back to the **Scene Properties** tab and to the **IFC Project** panel and
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press **Save Project**. Save your new IFC model somewhere on your computer.
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.. image:: images/save-project.png
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Congratulations! You have now created your first OpenBIM model from Blender! You
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can open the IFC file in any other program, and you will see something similar
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to the image below. Three simple open source online viewers you can test with
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are `IfcPipeline <https://view.ifcopenshell.org>`__, `IFC.JS
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<https://ifcjs.github.io/web-ifc-viewer/example/index>`__, and `3DViewer
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<https://3dviewer.net/>`__.
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.. image:: images/ifc-pipeline.png
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Placing occurrences of an element type
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--------------------------------------
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TODO
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Changing the locations of elements
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----------------------------------
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TODO
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Modeling a simple building
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--------------------------
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TODO
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