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# Blender BIM IFC
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# BlenderBIM Add-on
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_Under heavy development!_
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An add-on to Blender to allow BIM functionality.
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Let's use Blender to create BIM models, because why not?
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## Features
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- IFC4 is a first-class citizen. IFC4 has been an ISO standard since 2013, with
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the latest published in 2018. It contains many more features than IFC2X3,
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published back in 2005.
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- Available for Windows, Mac, and Linux!
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- Use open-source Blender 2.8 to do digital modeling! Used by NASA, Hollywood,
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and Ubisoft, Blender allows real-time modeling in rendered view, animations,
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file linking, proxy objects, Blender Cloud collaboration, lighting analysis,
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CFD, energy modeling, and a huge ecosystem of add-ons with a thriving
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community. No licensing, and with a strong Python API to integrate into your
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custom workflow.
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- Create complex spatial structures with multiple sites, buildings, facilities,
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bridges, and building parts. Sites can be broken down into sub-sites and
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multiple buildings per site. You can categorise different floors to different
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buildings.
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- Classify any geometry as any IFC type. Just because it is a wall doesn't
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mean you should be limited to modeling it in a certain way. Easily change
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from one type to another, switch relationships and aggregations, reuse or
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even remove geometry altogether, without damaging your geometry or breaking
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your BIM model.
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- Use collections to create element compositions and decompositions with full
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control over the classifications of their parts. Most BIM programs don't give
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this flexibility. Create collection instances to efficiently duplicate
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composite objects.
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- Allow BIM objects to instance a shared geometric representations. This allows
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you to place the same shape in multiple objects without drastically
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increasing your filesize.
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- Provide a custom value to any simple IFC attribute of an IFC product.
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- Create product types that regular IFC products can inherit attributes from.
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- Define your own property sets with control over exactly how the data in the
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property sets are stored using property set template definitions which you
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can download or create yourself. Property sets can apply to both types and
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objects, and object property sets can selectively override type property
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sets.
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- Applies array modifiers to create instances.
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- Basic quantity take-off support for costing.
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- Settings to toggle export of quantities or geometric representations.
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Exporting IFC data without geometric representations is much faster and a
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fraction of the filesize.
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- Maintain `GlobalId` between exports, so that you can manipulate the IFC
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reliably in other software while making changes.
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- Not all objects need full solid geometry. Create representations as 2D or 3D
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curves / wireframes for rapid and lightweight BIM development.
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- Create map conversions and coordinate reference system definitions to link
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BIM to GIS.
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- Export basic materials with surface and diffuse colours for representation.
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You can also link materials to an externally defined file, such as a `.blend`
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Cycles material, V-Ray material, or even Radiance material for lighting
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simulation.
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- Switch between different types of metric units when modeling.
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- Model multiple representations for different purposes for a single BIM
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object or type, such as footprints, axis, reference, or clearance geometry.
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You can export just the type of representation required for your usecase, or
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export multiple for the user to choose from.
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- Record qualitative objectives such as design intentions, health and safety
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strategies, or code compliance, performance solutions, and more, in the BIM
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model and directly associate them to objects or types.
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- Classify objects and types to different classification systems such as
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Uniclass, Omniclass, or your custom system.
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- Associate external document files such as plans, brochures, specifications,
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warranties, or anything to objects and types.
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- Specify swept solid geometries, allowing you to round-trip geometry
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manipulation with other BIM software which have more limited geometric tools,
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like Revit.
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- Create material layer sets, for objects which have materials in predefined
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layers with thicknesses.
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- Create material constituent sets, for objects which are made up of
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arbitrarily mixed ingredients.
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- Specify nested and hosted element relationships.
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- Specify predefined door attributes as defined in the IFC4 specification.
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- Specify predefined window attributes as defined in the IFC4 specification.
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- Specify surface styles either defined as part of a material or assigned
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directly to an object's representation.
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- Colour coding by IFC class to visually spot mistakes
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Some more experimental features:
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- Cut sections for documentation with OpenCascade
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- Export gbXML files that are linked to your IFC file to do energy analysis
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- QA module to generate Gherkin unit tests to validate your BIM models
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- HTML formatter to generate reports from QA results
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- COBie spreadsheet extraction to import into CAFM systems
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## Demo
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[See demo video](https://www.youtube.com/watch?v=iD3v3eu2AjY)
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It's only just started, so everything can and will change. But if you want to
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check it out:
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1. Install [Blender](https://www.blender.org/) 64-bit version.
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2. Download the latest packaged version of Blender BIM from
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[here](https://blenderbim.org/builds/).
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3. Launch Blender. Go to `Edit->Preferences->Add-ons->Install...`. Browse to
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the downloaded `.zip` file from step 2.
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4. Enable the checkbox next to the Import-Export IFC Blender plugin which will
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show up.
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5. All done! You will find an import and export IFC option in the `File` menu.
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By default, Blender BIM will export whatever you have selected. The objects you
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have selected _must_ belong in an `IfcProject` and spatially contained, such as
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witihn an `IfcBuilding`. It must also follow the naming convention. Please see
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the screenshot below for an example scene.
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A naming convention of `IfcClass/IfcName` is enforced. If you name your object
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`IfcWall/Foo`, it will turn into an `IfcWall` with the name attribute set to
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`Foo`. You can override object attributes using Blender's `Custom Properties`.
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Your objects must live in a top level `Collection` defined as a context class,
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usually something like `IfcProject/Foo`. You can then nest spatial structures
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underneath to create a hierarchy.
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## Pictures
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... this Blender files creates this IFC file ...
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More information on the [BlenderBIM Add-on website](https://blenderbim.org).
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