Introduction
A Revit family is a group of elements with a common set of properties and a related graphical representation. It is a definition and compilation of all the elements that can be inserted into a Revit project, both in 2D and 3D. Revit families can be system families, such as walls, doors, and views, or loadable families, such as furniture, texts, and dimensions. Revit families are Building Information Modelling (BIM) templates and 3D models of various objects that can be downloaded from external sources or created in Revit. Revit families allow users to add both standard and custom elements to their building models and to control and manage their design changes more efficiently.
Why use Revit families?
Revit families provide many benefits for building design, such as:
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They enable parametric modeling, which means that you can create flexible and adaptable components that can change according to predefined rules or parameters.
They allow automation, which means that when you make a change in one part of the model, it is automatically updated in all other related parts.
They facilitate collaboration, which means that multiple users can work on the same model at the same time, using the same standards and best practices.
They improve accuracy, which means that you can create detailed models that reflect the real-world conditions and specifications of your building project.
They enhance productivity, which means that you can save time and resources by reusing existing components or creating new ones from scratch.
Types of Revit families
There are different types of Revit families, depending on how they are created and used. The main types are:
System families: These are built-in elements (e.g., walls, floors, roofs) that are created within the project environment. They cannot be loaded or modified outside the project.
Loadable families: These are user-created or pre-built elements (e.g., doors, windows, furniture) that are loaded into projects as needed. They can be created or modified in the Revit Family Editor.
In-Place families: These are custom, project-specific elements that are created within the project environment. They are similar to loadable families, but they cannot be reused in other projects.
Nested families: These are families within families for complex components. For example, a door family can contain a handle family as a nested component.
Grouped families: These are multiple elements combined into a reusable object. For example, a desk family can How to create a Revit family
To create a Revit family, you need to use the Revit Family Editor, which is a separate mode of the Revit software. The Family Editor allows you to create and modify the geometry, parameters, materials, and visibility settings of your Revit family. The process of creating a Revit family consists of five main steps:
Step 1: Choose a family template
The first step is to choose a family template that matches the type and category of the element you want to create. A family template is a file that contains predefined settings and information for your Revit family, such as units, dimensions, reference planes, parameters, and constraints. You can choose from a variety of built-in templates or create your own custom templates. To choose a family template, follow these steps:
Open the Revit software and click on the File tab.
Select New > Family.
Browse through the folders and select the template that suits your needs. For example, if you want to create a door family, select the Door.rft template.
Click Open.
Step 2: Draw the geometry
The second step is to draw the geometry of your Revit family, which is the shape and size of the element you want to create. You can use various tools and commands in the Family Editor to sketch and model your geometry, such as lines, arcs, circles, rectangles, extrusions, blends, sweeps, and revolves. You can also import existing geometry from other sources or use nested families as components of your geometry. To draw the geometry of your Revit family, follow these steps:
In the Family Editor, click on the Create tab.
Select the tool or command that you want to use to draw your geometry. For example, if you want to create a rectangular door panel, select the Extrusion tool.
Specify the properties and options for your geometry in the Properties panel and the Options bar. For example, if you are using the Extrusion tool, you can set the material, work plane, start and end level, and visibility parameters for your extrusion.
Draw your geometry in the drawing area. You can use reference planes, dimensions, snaps, and alignment tools to help you draw accurately and precisely.
Click Finish Edit Mode when you are done with your geometry.
Step 3: Add parameters and constraints
The third step is to add parameters and constraints to your Revit family, which are the properties and behaviors that define how your element works and interacts with other elements in your project. Parameters are variables that store information about your element, such as dimensions, materials, names, and types. Constraints are rules that control how your element changes when you modify its parameters or when it is placed in a project. You can use various types of parameters and constraints in your Revit family, such as instance parameters, type parameters, label parameters, global parameters, equality constraints, dimensional constraints, and geometric constraints. To add parameters and constraints to your Revit family, follow these steps:
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In the Family Editor, click on the Modify tab.
Select the element or elements that you want to add parameters or constraints to.
Click on the tool or command that you want to use to add parameters or constraints. For example, if you want to add a label parameter to a dimension, select the Label tool.
Specify the properties and options for your parameters or constraints in the Properties panel and the Options bar. For example, if you are using the Label tool, you can set the name, discipline, type, group, and formula for your label parameter.
Apply your parameters or constraints to your element or elements in the drawing area. You can use reference planes, dimensions, snaps, and alignment tools to help you apply them accurately and precisely.
Step 4: Add materials and visibility settings
The fourth step is to add materials and visibility settings to your Revit family, which are the attributes that affect how your element looks and behaves in different views and situations. Materials are properties that define the appearance and physical characteristics of your element, such as color, texture, transparency, reflectivity, and thermal conductivity. Visibility settings are properties that control when and how your element is displayed in different views and levels of detail, such as coarse, medium, and fine. You can use various tools and commands in the Family Editor to apply materials and visibility settings to your Revit family, such as the Material Browser, the Paint tool, the Visibility/Graphics dialog box, and the Visibility/Graphic Overrides dialog box. To add materials and visibility settings to your Revit family, follow these steps:
In the Family Editor, click on the Manage tab.
Select the element or elements that you want to add materials or visibility settings to.
Click on the tool or command that you want to use to add materials or visibility settings. For example, if you want to apply a material to a surface of your element, select the Paint tool.
Specify the properties and options for your materials or visibility settings in the Properties panel and the Options bar. For example, if you are using the Paint tool, you can select a material from the Material Browser or create a new one.
Apply your materials or visibility settings to your element or elements in the drawing area. You can use reference planes, dimensions, snaps, and alignment tools to help you apply them accurately and precisely.
Step 5: Test and load the family
The fifth and final step is to test and load your Revit family into a project. Testing your Revit family means checking its functionality and performance before using it in a project. You can use various tools and commands in the Family Editor to test your Revit family, such as the Flex tool, the Preview Visibility tool, the Family Types tool, and the Load into Project tool. Loading your Revit family means inserting it into a project where you can use it as a component of your building model. You can use various tools and commands in the Revit software to load your Revit family, such as the Insert tab, the Load Family tool, and the Place Component tool. To test and load your Revit family, follow these steps:
In the Family Editor, click on the Modify tab.
Select the element or elements that you want to test or load.
Click on the tool or command that you want to use to test or load your Revit family. For example, if you want to check how your element changes when you modify its parameters, select the Flex tool.
Specify the properties and options for your testing or loading in the Properties panel and the Options bar. For example, if you are using the Flex tool, you can adjust the values of your parameters and see how your element responds.
Test or load your Revit family in the drawing area. You can use reference planes, dimensions, snaps, and alignment tools to help you test or load accurately and precisely.
Best practices for Revit families
Creating a Revit family is not enough to ensure a successful building design project. You also need to follow some best practices and tips to optimize your Revit family creation and usage. Here are some of them:
How to optimize your Revit families
To optimize your Revit families means to improve their quality and efficiency by reducing errors, conflicts, and redundancies. You can optimize your Revit families by:
Using consistent naming conventions and standards for your Revit families and their parameters.
Using appropriate levels of detail and complexity for your Revit families depending on their purpose and context.
Using shared parameters and nested families to avoid duplication and increase flexibility.
Using formulas and conditional statements to add intelligence and logic to your Revit families.
Using purging and auditing tools to remove unused or corrupted elements from your Revit families.
How to organize and manage your Revit families
To organize and manage your Revit families means to store and access them in a convenient and secure way by using folders, libraries, and databases. You can organize and manage your Revit families by:
Creating folders and subfolders for different categories and types of Revit families.
Creating libraries for common or standard Revit families that can be reused in multiple projects.
Creating databases for custom or project-specific Revit families that can be shared with other users or teams.
Using tags, keywords, and metadata to describe and classify your Revit families.
Using backup and recovery tools to protect your Revit families from loss or damage.
Conclusion
In this article, you have learned how to create and use Revit families for your building design projects. You have also learned some best practices and tips to optimize your Revit family creation and usage. By following these steps and recommendations, you can create powerful and versatile components of your building models that can enhance your productivity, accuracy, collaboration, automation, and parametric modeling capabilities. You can also download free Revit families from various online sources or create your own custom ones from scratch. With Revit families, you can unleash your creativity and innovation in building design.
FAQs
Here are some frequently asked questions and answers about Revit families:
What is the difference between a family type and a family instance?
A family type is a variation of a loadable family that has a specific set of parameter values. For example, a door family can have different types based on their width, height, material, etc. A family instance is an individual occurrence of a family type that is placed in a project. For example, each door that you insert in your model is a family instance of a certain door type.
How do I edit an existing Revit family?
To edit an existing Revit family, you need to open it in the Family Editor mode. You can do this by selecting the family instance in the project environment and clicking on Edit Family in the Modify tab. Alternatively, you can open the family file directly from its location by clicking on Open > Family in the File tab. Once you are in the Family Editor mode, you can make changes to the geometry, parameters, materials, and visibility settings of the Revit family. When you are done with your edits, you need to save and load the Revit family back into the project or overwrite the existing one.
How do I create a new Revit family from an existing one?
To create a new Revit family from an existing one, you need to duplicate and modify the existing Revit family. You can do this by selecting the family type in the project environment and clicking on Duplicate in the Properties panel. Alternatively, you can open the family file directly from its location by clicking on Open > Family in the File tab, and then clicking on Save As > Family in the File tab. Once you have duplicated the Revit family, you can make changes to its geometry, parameters, materials, and visibility settings in the Family Editor mode. When you are done with your changes, you need to save and load the new Revit family into the project or overwrite the existing one.
How do I download free Revit families?
To download free Revit families, you need to visit online sources that offer Revit families for various categories and types of elements. Some of these sources are:
RevitCity: A website that provides free Revit families, objects, and resources for users and professionals.
BIMobject: A website that provides free Revit families, objects, and content for BIM projects.
NBS National BIM Library: A website that provides free Revit families, objects, and standards for BIM projects.
Autodesk Seek: A website that provides free Revit families, objects, and content for Autodesk products.
BIMsmith: A website that provides free Revit families, objects, and tools for BIM projects.
To download free Revit families from these sources, you need to register and create an account on their websites. Then, you can browse through their collections and select the Revit families that suit your needs. You can also use filters and search tools to narrow down your options. Once you have found the Revit families that you want to download, you can click on the download button or link and save them to your computer. Then, you can load them into your project using the Insert tab or the Load Family tool.
How do I create a custom Revit family template?
To create a custom Revit family template, you need to modify an existing family template or create a new one from scratch. You can do this by opening the Family Template file (.rft) in the Family Editor mode. Then, you can add or remove reference planes, parameters, constraints, materials, and visibility settings to suit your needs. You can also import geometry or nested families as components of your template. When you are done with your modifications or creations, you need to save your custom Revit family template using the Save As > Family Template command in the File tab. Then, you can use your custom Revit family template to create new Revit families.
How do I share my Revit families with other users or teams?
To share your Revit families with other users or teams, you need to export and import them using various methods and formats. Some of these methods and formats are:
RFA: This is the native file format for Revit families. You can export your Revit families as RFA files using the Save As > Family command in the File tab. Then, you can import them into other projects using the Insert tab or the Load Family tool.
RVT: This is the native file format for Revit projects. You can export your Revit families as RVT files using the Save As > Project command in the File tab. Then, you can import them into other projects using the Insert tab or the Link tool.
IFC: This is an open file format for BIM projects. You can export your Revit families as IFC files using the Export > IFC command in the File tab. Then, you can import them into other projects using the Insert tab or the Link tool.
DXF: This is a file format for 2D and 3D drawings. You can export your Revit families as DXF files using the Export > CAD Formats > DXF command in the File tab. Then, you can import them into other projects using the Insert tab or the Import tool.
To share your Revit families with other users or teams, you also need to consider the compatibility and interoperability of the Revit software versions and platforms that you and your collaborators are using. You may need to use file converters or translators to ensure that your Revit families can be opened and edited by other users or teams without losing data or quality.
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