At the family level, a line based family is one that has its main geometry attached to the length of a reference line.
At the project level, a line based family is one that does not prompt for an insertion point, but for a start and end point, which determine the length of the family in the project. This length can be scheduled if the length parameter of the family is tied to a shared parameter.
Line based families can be used for 2D detail components and for 3D models. Attached is a very simple example of a 2D line based detail component family. It's an arrow. When you insert this family in a project, instead of getting an arrow already created, like in other families, you see a prompt that says "click to enter component start point", and then, "click to enter component end point". So it is the user who determines the length of the family by providing the two clicks, and the user can continue clicking more points in sequence to create more arrows, to draw, for example, an evacuation route.
See attached image and family file.
Alfredo Medina _________________________________________________________________ ______
Licensed Architect (Florida) | Freelance Instructor | Autodesk Expert Elite (on Revit) | Profile on Linkedin
