Trying to go back to Revit after a long break as I have to make a ton of families for Revit in the near future. I am having a hard time grasping the logic with the drafting.
For example if I am creating an extrusion in the ref level. I start by drawing a rectangle with one side aligned with the horizontal reference plane. I then lock the alignment of the line with the horizontal reference plane by clicking the red lock symbol. Then I click the measurement on the left side of the rectangle, measuring the depth of the to-be extrusion. When I change the value, I would assume the rectangle would stretch from the end that is not constrained to the reference plane, but no. I get an error when Revit tries to stretch the rectangle from the constrained side. Why?!
What is the logic behind this? Is there a tutorial that could help me understand this?
I know this might not be the correct way of working with Revit but nevertheless I would like to learn the logic behind the way the program works.
I have worked with other cad programs for years and maybe I am stuck on a different logic.
From your description, seems like you're trying to change the value while selecting the constrained line. In this case, because you're in Edit Mode, Revit will try to move the line you have selected. If you create a dimension and label it outside edit mode, Revit will move the unconstrained side as usual.
As things get more complex than this example, it's advisable to use reference planes to constrain the geometry. For something this simple, (which should work as you describe) it may seem like overkill but it's good practice.
I recommend you to watch this tutorial, to understand the sequence of steps to make a parametric family:
https://youtu.be/RyP9nOTpXo0?si=CUCJ_hqDb4ttwMAN
Hi @tuomas.einamoV2MEV
Thanks a lot for posting your question to the forums! Have the solutions suggested by @Alfredo_Medina @RSomppi @pedruccioli helped with your issue?
We look forward to hearing back from you with more information so we can help you as a community!

Jonathan Hand
Industry Community Manager | AEC (Architecture & Building)
Sie finden nicht, was Sie suchen? Fragen Sie die Community oder teilen Sie Ihr Wissen mit anderen.