Creating Building Elements from Volume Instances in CAD
You can generate building elements using volume instances, regular models, imported entities, or polygon mesh faces.
Internal building volume (left) converted to building elements (right)
Abstract Model: If you want to model a building abstractly or input the total volume, surface area, and floor area into a detailed schedule, volume instances are recommended. To create building elements from a volume instance, use the Building Maker tools. Note that when modifying mass faces, building elements created with Building Maker tools do not update automatically—you must manually update these elements to match the current size and shape of the mass face.
Conventional Model: For creating unique and distinctive shapes without abstract modeling of the entire building, use conventional models. Walls, roofs, and curtain wall systems can be generated from faces within regular model families.
Imported Entities: To create elements from faces of imported entities, ensure these entities are imported into the conceptual design environment for mass families or into the family editor for regular models.
Polygonal Mesh: Polygonal mesh objects can be imported from various file formats. Since volume families cannot extract volume information from polygonal meshes, it is better to use regular model families for polygonal mesh geometry.
Tip: AutoCAD Architecture mass elements must be decomposed in AutoCAD Architecture before importing into Revit. When Revit imports these symbols, they appear as polygonal mesh objects. Additionally, mass elements can be converted into AutoCAD solid objects before importing into Revit.
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