Let’s say you have a family that has shape handles for instance dimensions (Length Parameters). What if you want to use it for quick prototyping, and then switch that same family into a version that uses Type based parameters?
Here’s how I went about it:
Change all existing Reference Planes to “Not a Reference”
Create new Reference Planes
Create new instance parameters bound to those Reference Planes
Lock one of the planes on each Dimension to existing origin planes
Create a corresponding set of Type dimensions
Create a set of Yes / No parameters for “Use Type for …”
Create formula like: if(Use Type for X, x type, x instance)
Apply it to the original parameters (the ones that are driving geometry):
How to Use:
Place the family
Resize using the shape handles (instance dimensions)
Create a Type
Modify the type Values and Tick the “Use Type” box
At this point, the Shape Handles are still visible, but only the Type values are used for the geometry.
Another nice workaround by Philip Chan – if you want to change one of Revit’s built-in Type Parameters (derived from a Family Template, such as Door Fire Rating) to an Instance Parameter, you just have to take the Family on a little round trip to a more flexible Family Category.
New Door based on Door Family Template
Switch to Generic Model Type
Change built-in Type Parameter for Fire Rating to Instance