I would like to understand why Revit sometimes allows to create surfaces and sometimes it doesn't.
The following steps show that selecting a closed loop of curves may or may not allow to create a bounded plane. Can you please help me understand when to expect what behavior?
Is there another way to create a rectangular face, other than modifying the profile of a surface created with another profile that Revit happened to like?
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@stefanome wrote:That video has nothing to do with my question.
I thought it did. You asked if there was another way to create a rectangular form.
I thought it did. You asked if there was another way to create a rectangular form.
Well, I actually asked why I can create a surface with one profile and not with another, I wasn't interested on the rectangular form, I was interested in the profile, whatever its shape was (sorry, I didn't specify this detail).
I knew it was possible because I had seen those two buttons that ask you whether you want to create a surface or an extrusion, but I didn't remember in what context. So I tried with all types of masses and families and templates and environments, but I couldn't find it. Then I tried with all combinations of entities and I found out that making a rectangle and creating a form doesn't allow to create a surface, but making a rectangle, deleting a line, adding a spline and creating the form does allow it. Then it is possible to select the surface, edit the profile, delete the spline, create the line, get back the original rectangle and the rectangular surface bounded by a profile finally works. All of this apparently makes sense in the Revit world, but it doesn't make any sense to me. Hence this post.
It is difficult to learn the Revit way when you don't understand why Revit decides to allow you to do something or not.
Here is a little background on why I am asking this question:
My goal is to create one family containing many surfaces, each with its own profile, so I can click on the family, then edit family, then click on one face, then edit profile. The faces represent a sheet metal panel that typically has 5 faces, but it can range anywhere between 1 and 30+ faces.
The attached model shows a very simple example that I was able to create using the insane put-the-spline / delete-the-spline trick.
This little model is a proof of concept to study the feasibility of an add-in that I am planning to create. The add-in will create thousands of panels using this technique. I want the panels generated by this add-in to be:
...so you're a sheet metal fabricator in a Revit world. How's that working out for you?
I know, right?
I am trying to avoid doing the job twice: lots of info is already in the Revit model, I want to avoid duplicating it to another tool like Autocad or Inventor and going back and forth between two environments. If I can write some code and teach Revit a few new tricks, I might be lucky and get Revit to manage the whole process.
I'll let you know in 6 months.
Constantin Stroescu
I don't follow your explanation. I still see two sets of input virtually identical to each other producing different results.
@constantin.stroescu wrote:Revit can not decide what to do
What do you mean "can not decide"?
What is the difference in the input between 4 lines laying on a plane and 3 lines plus a spline laying on the same plane?
The input in both cases is a set of planar entities laying on the same plane, but in one case Revit decides that I want to do a closed solid, while in the other case it asks me.
See if you use
Constantin Stroescu
Now I understand why sometimes Revit allows to create a surface and sometimes doesn't. As you say, when the spline has been created with one button rather than with the other.
I marked your answer as the accepted solution, because it does describe the behavior that I didn't understand... but I still don't understand the reason why Revit has been designed in such a way.
I will try to express why I am still confused. Here are the things in my mind right now:
With my limited knowledge of Revit I can't understand why. Perhaps they are trying to guide the user to do the right thing and ask them to do acrobatics like add-a-spline/create-a-surface/replace-the-spline-with-a-line to the less right thing? If this is the case, what are the right things you do with Revit vs the not right things?
Perhaps they are trying to guide the user to do the right thing and ask them to do acrobatics like add-a-spline/create-a-surface/replace-the-spline-with-a-line to the less right thing
I agree with you...
Basically Revit is a BIM instrument and it is developed so to work with AEC entities , to create a Virtual Building, to facilitate an advanced level of collaboration while the design process , to prepare the Model to be used further into Construction and Exploitation phases.
The 3D Mass Modeling level can not be compared with other dedicated 3d Modeling Softwares that are designed to work with NURBS and NURMS.
In fact Mass modeling of Revit has as main purpose to create building envelopes that are used for simple preliminary studies, volume and Gross Area reports, energy analysis ....all pragmatic purposes.
So , yes , Revit has some predefined settings and try to anticipate your design needs.
As a MAX user, for instance, you will be disappointed by the degree of how Revit works at Sub-object level, or with Material mapping ...
But for building design process Revit is an excellent tool.
Constantin Stroescu
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