# Level of Detail / Advanced

### Level of Detail

This option lets you select the level of detail for tessellated geometry. By default, the level of detail is set to “Low”. As the Level of detail has impact on file-size and data-quality it is recommended to evaluate this option before export.

These options allow you to control the level of tessellation for some Revit elements. Selecting Medium or High for this option generally results in larger, but more accurate, BRep and profile representations.

The main Revit elements affected by this control are: elbows, floors, pipe fittings, railings, ramps, spaces, and stairs. Highly-detailed extrusion profiles are also affected for these items.

<figure><img src="/files/8F4BMh3ZqlgPhKefPdMc" alt=""><figcaption></figcaption></figure>

### Advanced

This tab offers advanced options which can be used in case of specific requirements:&#x20;

<figure><img src="/files/dqaplIJnZCogkzUQZjrw" alt=""><figcaption></figcaption></figure>

**Export parts as building elements** is only relevant when exporting for systems which don't support IfcBuildingElementPart, as it will export parts as building elements instead.&#x20;

**Allow use of mixed “Solid Model” representation** enables the export of combined swept solid and B-rep models. A geometric object in an IFC data model is normally generated from either one or several swept solid objects, or from B-rep objects alone. The combination of these two types of representation is not enabled by default in the IFC schema. For more complex components, in particular, this leads either to a larger file size or incorrect presentation, as elements are wholly represented B-rep objects. Solid model representation combines the two types of representation within a single class, which can mean better geometric results at a smaller file size for complex models. It should be noted, however, that the IFC file exported using this setting no longer complies with the default IFC schema and must therefore be accepted as such by all those involved in the project. For certain areas of use, it may be necessary to have an unaltered default schema for export.

**Use active view when creating geometry** will use the level of detail level of the current view (Coarse / Medium / Fine) and will export all objects according to the way they are displayed in Revit.

**Use family and type name for reference** will influence the way the naming of the reference in IFC. By default, the Revit Type name is used for the IFC reference. By activating this option, the family name will be used along with the type name:

<figure><img src="/files/1YbGn6kkhZiPeRsKC9Uw" alt=""><figcaption></figcaption></figure>

**Use 2D room boundaries for room volume** simplifies the calculation of the room volume based on two-dimensional spatial boundaries. Using the default settings, the Revit room geometry is used to determine the volume in IFC.

**Include IFCSITE elevation in the site local placement origin**: Select this option to include the elevation from the Z offset of the IFCSITE local placement. Clear the option to exclude it.

**Store the IFC GUID in an element parameter after export**: Select this option to store the generated IFC GUIDs in the project file after export. This will add „IFC GUID“ parameters to elements and their types, and Project Information for Project, Site, and Building GUIDS.

**Export bounding box** allows the export of bounding box representations.

**Keep Tessellated Geometry as Triangulation**: Select this advanced option to use a triangulation method that is compatible with older IFC 4 Reference View viewers.

**Use Type name only for IfcType name** excludes the family name for the IFC type name:

<figure><img src="/files/6ZRMN8wQZawO3Jkaa7pN" alt=""><figcaption></figcaption></figure>

**Use visible Revit name as IFC entity name**: influences the generation of the element name in IFC:

<figure><img src="/files/ZNhUZw1bDA9guTbmqr0l" alt=""><figcaption></figcaption></figure>

**Entities to Export** will open an additional dialog where specific entities can be excluded from the export. This Setting will override the global [IFC Mapping override](/revit/ifc-export-category-mapping/category-mapping-override.md).&#x20;

<figure><img src="/files/ZC0K4JI4tWZhETJRql85" alt=""><figcaption></figcaption></figure>


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