The most essential component in Revit is the family. A family consists of a group of elements, each made up of two parts: a set of parameters and a graphical representation.
In Revit’s parametric modeling system, all elements are created based on families. While different elements within the same family may have varying parameter values, the overall set of parameters remains consistent. These variations create different types within the same family. Family parameters in Revit typically include types such as text, number, length, angle, area, volume, and material. During modeling, some parameters can be adjusted to meet specific design requirements, allowing the family’s shape to be controlled through these variable parameters.
Building a family is fundamental to BIM model construction, as the quality of family creation directly impacts the efficiency of Revit modeling. Parametric modeling within a family is achieved by defining formulas that determine the structure of a free-form object. When one parameter changes, other related parameters adjust automatically according to these formulas, ensuring the family meets its design criteria. This custom modeling approach enables the creation of building forms not available in the standard system family library. Later, designers can use these custom families as-is or modify them slightly to streamline the modeling process.
The key steps to create a new component family include:
(1) Selecting the appropriate family template
(2) Defining the family category and parameters
(3) Establishing the family types and their parameters
(4) Creating the physical geometry
(5) Setting visibility options
(6) Adding connectors to the family
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