Revit Parametric Family Creation Questions and Answers

Question 1

When creating a parametric family in Revit, which element serves as the foundational framework for constraining geometry and driving its behavior?

Accepted Answer

Reference Planes

Answer

Reference planes act as the skeleton of a parametric family. Geometry is created and then constrained (locked) to these planes. When a parameter tied to a dimension between reference planes is changed, the planes move, and the geometry flexes accordingly. This is the fundamental principle of creating robust parametric families.

Question 2

You are creating a door family and want the door's width to be editable for each individual instance placed in a project. What type of parameter should you create for the 'Width' dimension?

Accepted Answer

Instance Parameter

Answer

An Instance Parameter allows for unique values for each instance of the family placed in the project. A Type Parameter would change the width for all doors of that specific type simultaneously.

Question 3

Which of the following is the primary advantage of using a Reference Line instead of a Reference Plane in the Revit Family Editor?

Accepted Answer

It can be used to control angular parameters.

Answer

Reference Lines are distinct from Reference Planes because they have start and end points and can be directly used to create and control angular parameters. An angular dimension can be placed between a Reference Line and another line or plane, and then labeled with a parameter to drive rotation.

Question 4

A user is creating a desk family that includes an optional, nested computer model. They want to be able to turn the visibility of the computer on and off within the project. How should this be accomplished?

Accepted Answer

By placing the computer on a design option that is turned off.

Answer

To control the visibility of a nested family, you select the nested family within the host family editor, and in its properties, click the associate button next to the 'Visible' parameter. This allows you to link its visibility to a new or existing Yes/No parameter (either instance or type) in the host family.

Question 5

You need to create a formula for a 'Length' parameter that ensures it is always half the value of the 'Width' parameter. What is the correct syntax for this formula in the Family Types dialog?

Accepted Answer

Width / 2

Answer

In the Formula column of the Family Types dialog, you enter the expression directly. Revit understands the parameter names. The correct syntax to set the Length to half of the Width is simply `Width / 2`.

Revit Practice Test

Revit Practice Test

Revit Parametric Family Creation Questions and Answers