Hello,
I have a problem that comes back every time. When i try to change the dimensions of a wall, symbolic line or practically anything else, i run in to the same problem over and over again. It doesn`t happen every time, but more than i can work with.
This is an example of the problem:
I have symbolic line with i want to set on the same distance on both sides from two objects. The lenght of the line is not irrelevant for me. So i draw the line, set a linear dimension on both endpoints of the line and connect those with the objects. When i change one of them, the other one changes to and the line keeps the same length. Not a problem. I lock the first lineair dimension and change the other one. But sometimes i get a error: Constraints are not satisfied. And it highlights the locked Dimension. How is this even possible? The only constraint is the lock on the first lineair dimension. Revit just refuses to change the length of the line, but there is no constraint on it.
This happens to me a lot. Revit refuses to change lengths of all kind of elements. Walls and even places of windows.
I hope someone can help because its pretty annoying. Thanks!
Is this in a family? Symbolic lines are used in the family environment.
If you mean in the project line, you probably mean a detail line. Revit only gives this warning when the lines are constrained and what you are trying to do causes a conflict. If this happens to you a lot, you are probably over-constraining elements in your model - note that this increases processing time. The constraints are not always obvious, but there is a reveal constraints button that can help you see what the constraints are (its the one with the padlock and dimension line at the bottom of your screen.
Thanks for the quick reaction. It happens to me in the family and the project line. It is definitely not over-constraining. The only constraint to this line is the one you see in the file of my first messages. I checkt this with Reveal Constraints. Revit just refuses to let me change the length of the line. Even when i change the length of the line I get the error, even when it`s locked on one site. It Refuses to go one way instead of both sites. And again, this is just an example. It happens with all types of elements an lines.
I literally have 2 different slide doors where i want to put in a symbol. The first one no problem. The second one does not work and i use the exact same way. I don`t want to try another way, because this one should work every time and not sometimes. It does not make sense. So there has to be something wrong and i try to find out what.
Perhaps you could post your family so that we can open it and have a look. I suspect that you may have copied the line in the family, bringing some constraints with it. Try creating the second one from scratch.
I did not copied the line. It a new line. Here is the file.
Why not just align the lock both ends of the Symbolic Line to Ref. Planes that are inset exactly 100mm on both sides and then locked the Ref. Planes with dimensions.
Just one aspect while editing.
use this " REveal Constraints: to see the invisible locking/constant which might affect the entire Revit family..
Chers
That`s is a solution for this particular problem. But it still does not explain why Revit allows it in one case, but not in another. And it doesn`t solve the problem when it happens with a wall or a window.
Hi
The Trick of Revit families when it comes to constraint is..
Never dimension anything to the Object/mass/extrusion/ 3d lines etc.
Dimension/and constraint ONLY to " Reference lines/planes TO Reference lines/planes"
and anything else, 3d, model lines, sublolic lines etc needs to be locked to those references...
Never lock one lines/extusion to other line or extrusion...this will just mess up the family.
also, pay attention to
A. Type Parameter
B. Instance Parameter.
Revit gives enough warning and mostly doesnt allow over constraint anyways...
and don't over constraint as much as possible.
hope that helps.
Cheers.
I can understand that and your right. But i did not overconstrain anything and the problem also happens in the regular mode, not only in a family. Even when I place a door and align it with something, sometimes Revit makes the door bigger, instead of moving the whole door.
Yeah that`s not very helpful. I do the exact same thing 2 times and Revit response on 2 different ways. How do i need time to figure that out?
When you align an item, hover your cursor on a plane and Revit will tell you what that plane is. It might be a face of extrusion or a reference plane. The results of clicking the different planes might be different.
Have a look at what @Corsten.Au wrote, I think that will help.
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