What is the method to create reference planes equidistant from the origin in a family?

The use of equality constraints is key in creating reference planes that are equidistant from the origin in a Revit family. When you apply equality constraints between reference planes, you ensure that the distance between them remains consistent and equal, regardless of any changes made to the dimensions or positions of other elements in the model. This method is particularly useful for maintaining symmetry in designs and ensuring that components remain balanced with respect to the origin.

When reference planes are equalized, if one reference plane is moved, the other automatically adjusts to maintain the same distance, providing a reliable way to define the geometry and layout of a family component. This is essential in creating components that need to retain specific proportions or symmetry in architectural design.

Other options, while related to the creation and manipulation of geometry, do not effectively achieve the goal of placing reference planes equidistant from the origin. For instance, symmetry constraints focus on reflecting geometry across a defined axis but do not enforce a consistent spacing. Distance constraints impose a specific fixed distance between elements, but may not maintain symmetry if one element is moved without considering the others. Reference lines serve as guiding elements but do not inherently provide the equality condition necessary for maintaining equidistance.