Revit Parametric Family Creation 3 — Questions and Answers
Question 1: What happens if you delete a reference plane that has an active dimension constraint tied to family parameters?
- The constraint is automatically transferred to the nearest reference plane
- The associated parameter is also deleted with no warning
- Revit warns that constraints will be lost and the geometry may fail (Correct answer)
- The family locks to prevent deletion
Correct answer: Revit warns that constraints will be lost and the geometry may fail
Revit warns you that deleting a constrained reference plane will break associated dimensions and can cause geometry failures.
Question 2: Which formula syntax correctly makes parameter 'B' equal to half of parameter 'A' in the Revit Family Editor?
- B = A * 0.5
- B = A / 2
- B = (A) / 2
- Both 'A / 2' and 'A * 0.5' are valid (Correct answer)
Correct answer: Both 'A / 2' and 'A * 0.5' are valid
Revit's formula engine accepts standard arithmetic operators, so both division and multiplication expressions produce the same result.
Question 3: In a wall-based family template, which default reference plane represents the face of the host wall that the family sits on?
- Center (Front/Back)
- Wall Face (Correct answer)
- Center (Left/Right)
- Top
Correct answer: Wall Face
The 'Wall Face' reference plane aligns the family's insertion point with the host wall's face, enabling correct face-based placement.
Question 4: What is the correct way to make a family parameter drive both the width of an extrusion and the position of a reference plane simultaneously?
- Assign the parameter to the extrusion and separately constrain the reference plane with an identical formula
- Dimension both the extrusion edge and the reference plane to the same reference plane, then label both dimensions with the same parameter (Correct answer)
- Use two separate parameters with a formula linking them
- Set the extrusion's width property to 'Driven by Reference Plane'
Correct answer: Dimension both the extrusion edge and the reference plane to the same reference plane, then label both dimensions with the same parameter
Labeling multiple dimensions with the same parameter ensures a single value controls all constrained elements simultaneously.
Question 5: When should you use a 'Void Extrusion' in a Revit family?
- To add transparent glass geometry
- To cut material away from a solid form, creating holes or recesses (Correct answer)
- To define the insertion point of the family
- To create geometry visible only in section views
Correct answer: To cut material away from a solid form, creating holes or recesses
Void forms subtract geometry from solids, allowing you to cut openings, recesses, or complex negative shapes into existing 3D forms.
Question 6: Which statement best describes the role of 'Subcategories' in a Revit family?
- They control which project phases the family element appears in
- They allow different parts of the family geometry to be controlled independently in Object Styles and view filters (Correct answer)
- They define the structural load-bearing behavior of the family
- They determine which schedule template the family exports to
Correct answer: They allow different parts of the family geometry to be controlled independently in Object Styles and view filters
Subcategories let you assign different linework and visibility settings to individual geometry elements within the same family.
Question 7: What must be true about a solid form in a Revit family for a Void to successfully cut it?
- The void must be on a separate workset from the solid
- The solid and void must overlap in 3D space and 'Cut Geometry' must be applied if they are in the same family (Correct answer)
- The solid must be set to 'Cuttable' in its properties panel
- The void must be on the same reference plane as the solid
Correct answer: The solid and void must overlap in 3D space and 'Cut Geometry' must be applied if they are in the same family
Within a family, overlapping solids and voids automatically cut each other; in some cases (e.g., nested families) the 'Cut Geometry' tool must be explicitly applied.
Revit Parametric Family Creation 3
What happens if you delete a reference plane that has an active dimension constraint tied to family parameters?