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All Revit Parameters Explained

There are five different parameters in Revit that you must understand, especially the difference between project and shared parameters. Why is that? Because there are some limitations for each parameter.

Remember!

  • Understand the differences among the parameters

  • Understand which parameters should be used

  • Understand Parameter Data



Where are they?


parameters in Revit

The parameters are displayed in the properties palette or type properties dialog. They are everywhere!


parameter properties and groups

In the Parameter Properties, it consists of …

Parameter Type

  • Built-in Parameter

  • Project Parameter

  • Family Parameter

  • Shared Parameter

  • Global Parameter


Parameter Data

  • Name - Parameter name. Make sure to follow OBOS or NBS

  • Discipline - Architecture (Common), MEP, Structure, Civil

  • Type of Parameter - Understand the differences such as integer or number or Length

  • Group parameter under - Where the parameter will be located in Properties palette

  • Edit Tooltip - Parameter description

  • Type/Instance - Type parameter will be located in Edit Type, whereas Instance will be visible in the Properties palette

  • Group Type/Group Instance - Group instance will allow you to change the value in the group, but group type is not.


Categories

  • Multiple categories can be selected if required.


Definition

Built-in Parameter


built-in parameter in Revit

Built-in Parameters exist as default and cannot be modified (cannot change name or category). They are normally pre-populated in the default template or project. As they exist in all projects, they can be used instead of shared parameters when agreed.


Project Parameter


project parameter in revit

Project parameters only exist in the project file and can be added to all categories either single or multiple categories. They cannot be transferred to other projects.


Family Parameter


family parameter in revit

Family parameters only exist in the family (but can be visible in the project loaded) and can be added to control variable values. They can be used to control the values in the nested families.


Shared Parameter


shared parameter in revit

Shared Parameters can exist in multiple projects and families and are saved in a text file that can be modified (if you are interested in this topic, check this article).


Global Parameter


global parameter in revit

Global Parameters only exist in the project file as a generic parameter that cannot be assigned to the category. It is often used to control and report values.


What parameters should be used?


what parameters should be used in revit

Project Parameter

  • It is ideal for project-specific information. It can filter content in the project schedule.

Shared Parameter

  • It is ideal for consistent information that can be used for future projects such as scheduling, auditing, and tagging.

Global Parameter

  • It only exists in a single project and cannot be assigned to the family category. It is ideal for the specific information to be maintained.

Family Parameter

  • Use for the metadata only.


How to create…

Project parameter?


project parameters in manage tap in revit

Go to Manage tab and select Project Parameters


add in the project properties

In the Project Parameters dialog, Click the Add… Button.


model categories in the project properties

Once the Parameter Properties appears, select Project Parameter in Parameter Type. Fill out all the data and select the desired Category and click OK. In this case, Door is chosen.


add in the project properties

Now, the parameter is shown in the dialog, so click OK to complete.


project parameter added

To check the parameter, select one of the doors in the project and find it in Properties. As you can see above, the parameter is successfully assigned to the door category.


Family parameter?


edit family button in modify tap in revit

In order to create a family parameter, you need to go to Family Editor by selecting Edit Family in Modify Tab. You can either select a family and edit it or create it from scratch.


family type tooltip

When the family editor is active, select Family Types to add Family Parameter, the descriptions shown above.


new parameter in family types

In the Family Type dialog, the New Parameter button is located in the bottom. To create a new family parameter, click this icon.


family parameter properties

Once the Parameter Properties appears, select Family Parameter in Parameter Type. Fill out all the data and click OK.


parameter created in family types

Now, the parameter is shown in the dialog, so click OK to complete.


Shared parameter?


shared parameter in manage tap in revit

Go to Manage tab and select Shared Parameter


edit shared parameters

As there is no shared parameter in the default project (unless you already load it), you need to create the shared parameter file. Once the Edit Shared Parameters dialog appears, Click the Create… button.


create shared parameter file

The file location should be set and the file should be saved. Make sure the appropriate naming.


new group in shared parameter file

Once the file is created, you must create the Parameter Group before making a new parameter. Click the New… button in Groups to create the group.


new parameter group

When the New Parameter Group is popped up, name the parameter group.


create new parameter

When you create the parameter group, you will see the one created in the parameter group. Now, you can create a new parameter by selecting the New… button.


edit parameter in parameter properties in Revit

In the Parameter Properties, fill the Name and set the Discipline and Type Parameter. It is recommended to add Tooltip Description to explain the parameter. Note: Once it is created, it cannot be edited or amended in Revit.


Complete the edit shared parameter prompt

The parameter is now appearing in the dialog. Click OK to complete the process.


project parameter in manage tap in revit

To apply the shared parameter in the project, you need to add it in the Project Parameters. Go to Manage tab, and click Project Parameters.


adding parameter in the project

In the Project Parameters dialog, Click the Add… Button.


select shared parameter

Select the Shared parameter in Parameter Type, and Click the Select… button.


select the shared parameter from the file

Once the dialog is popped up, select the parameter that you want to add. In this case, select SharedParameterSample and click OK.



select the model category

Once it is done, Parameter Data and Categories need to be set up. In this case, it will be in the Identity Data and assigned to Door category. Moreover, it is an Instance parameter and values are aligned per group type.


check the shared parameter in the properties

To check the parameter, select one of the doors in the project and find it in Properties. As you can see above, the parameter is successfully assigned to the door category.


Global parameter?


global parameter in manage tap in revit

You can find the Global Parameters icon in Manage tab.


create new parameter

In the Global Parameters dialog, Click the New Parameter icon to create a global parameter.


global parameter properties

In the Global Parameter Properties dialog, input the name, select Discipline and Type of parameter, assign Group parameter, and Edit Tooltip.


global parameter input

The global parameter requires the value in the Global parameters dialog like the key schedule. You need to define the value here.


associate with the object

Now, we need to assign the global parameter to a family. Let’s do it in a furniture family, but it can be assigned any categories. Select one of the elements and click the small button in Properties.


select the global parameter

In the Associate Global Parameter dialog, select the parameter that you created. In the real project, there will be more parameters, so it is important to create an appropriate naming convention so that it explains itself. Once it is selected, click OK.



check the parameter in the properties

As you can see in Properties, the global parameter is assigned to the family.

To sum up

  • Project Parameter should be used for project-specific data

  • Shared Parameter should be used for schedule and tagging

  • Family Parameter should be used for family metadata

  • Global Parameter should be used for project-specific data (non-family)


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