Modelling a truly curved Curtain Wall

April 2, 2019September 24, 2015 by Marcin Klocek

Revit Curtain Wall is a very useful tool, but lacks a proper implementation of truly curved Curtain Panels and Curtain Wall Mullions. Such functionality is necessary not only for curved glazing, which in real life is often avoided because of high costs, but also for elevation cladding in cases like the one shown below.

Building with curved elevation cladding panels

Revit allows using Basic Walls as Curtain Panels, what is a step towards the right solution because Basic Walls are curved when used as Curtain Panels in curved portions of Curtain Walls. The remaining issue is to have also curved mullions (Workers Compensation Southern California call at 714 598-3900), but it is only necessary for horizontal mullions as vertical mullions can remain straight. To achieve curved horizontal mullions we will use the Sweep functionality of Basic Walls.

Wall Sweep defined in the Edit Assembly window of Basic Wall

Sweeps are horizontal protrusions following the paths of Basic Walls, so they can serve as mullions when defined properly.

Settings of a Wall Sweep to be used as a mullion

Type properties of a Curtain Wall with a Basic Wall used as a Curtain Panel

To define a mullion as a Wall Sweep one needs a Sweep Profile component family, which serves as the Mullion profile, and the proper Distance and Offset settings of the Wall Sweep. A Basic Wall with such a Wall Sweep can then be used as a Curtain Panel of a Curtain Wall as shown on the left.

The 3D view and plan of the resulting curved elevation cladding modelled as Curtain Wall is shown below.

Curved elevation cladding modelled as Curtain Wall – 3D view and plan

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<p>Open letter to Autodesk from building industry community</p>
<p>We are writing this letter to express our concern about the level of development and sales policy of Autodesk software for building industry (Revit, AutoCAD) in recent years.<br />
The general feeling of a large part of the professional community is that the changes and improvements implemented in recent versions of Revit (2011-2015) have been far below expectations and do not satisfy most of the essential needs of the design and construction industry, while pricing and licensing conditions for all the Autodesk software are becoming less and less favorable.<br />
The issues, which cause our greatest concern in various areas and proposals for improvements, are listed below:</p>
<ol>
<li>
<p>Licensing policy<br />
We see the recently announced changes of the Autodesk licensing policy to “network subscription” as very unfavorable, because after they are introduced:<br />
•   Any investment in Autodesk software in our budgets will change from “initial” to “permanent” causing eventually a significant cost increase in a few years' perspective.<br />
•   For the existing licenses we will be denied the right to upgrade, but forced to buy new licenses of the same software if we want to keep them up to date.<br />
•   For the new licenses we will be denied the right to use the software after the “subscription” period even if we do not need to keep them up to date (as it is often the case with AutoCAD). Therefore we<br />
will be forced to pay for the services we do not want only to keep the software running. </p>
</li>
<li>
<p>Sales policy<br />
Building Design Suite (BDS) introduced in 2013 is more expensive than the earlier Revit Architecture Suite, but gives no real advantage to architects and other disciplines and seems to be driven more by marketing benefits of Autodesk than the by the real needs of the customers.<br />
We would therefore welcome flexible software bundles where the customers are able to choose what products they want to buy, rather than are forced to buy BDS, which contains many unwanted or undeveloped programs (Showcase, ReCap, Inventor, AutoCAD MEP, etc.) in cases when only AutoCAD and Revit are needed.<br />
Maintain a fair balance between cost and features is important to keep the business of Revit users sustainable. Mandatory subscription costs effective in 2016 will increase operations costs for architectural firms significantly, with no real added benefits and locked in recurring cost cycles. Added features of Autodesk are perceived as mere smart marketing ploys to justify the annual subscription policy, rather than actual enhancements to productivity.</p>
</li>
<li>
<p>Software development<br />
Despite increasing costs there have been little significant improvements in recent editions of Revit, although many of them are badly needed and have been reported by the architectural and BIM community since many years. This includes, but is by far not limited to:<br />
•   Introducing major improvements in upgrades and reducing the frequency of upgrades, which adversely affects projects spanning more than a year. Recently we have seen new versions of Revit not<br />
much different from earlier ones (especially Revit 2015 and 2014) while prices for upgrades are still the same.<br />
•   Inconsistent UIs and functionalities that comes with annual upgrades leaves little time for staffs to adopt and companies streamline workflows. By the time new features are fully adopted and<br />
streamlined productivity resumed, (approx. 6-8 months for large firms), another upgrade would be due, forcing practices to re-adopt and repeat streamlining process.<br />
•   Reviewing all the existing functionalities and improving their implementation. Many of them, although based on good concepts are not finished or not implemented properly and as such useless or<br />
difficult to use in many situations, e.g. Roofs, Stairs, Schedules, Filters, family parameters and formulas (terrible syntax).<br />
•   Improving many long neglected essential areas of Revit like Topography, Curtain Walls, Coordination tools, etc.<br />
•   Eliminating the confusion of two different family modeling environments (for “mass” families and for other families) and unify them into one, 3D modeling environment.<br />
•   General improving of the very cumbersome 3D Mass modeling tools by making it more intuitive, user friendly, enabling visibility of Reference Planes in 3D, implementing NURBS surfaces, etc., etc.<br />
•   Removing incompatibilities between Walls, Roofs and Floors “drawn” and built “by face”, so that Walls can be properly connected in 2D and 3D, regardless of their shape and the way they were created.<br />
•   Eliminating the constant need of finding “workarounds”, of which Revit is infamous, by refurbishing the tools to be really able to do, what they are meant to and what is advertised by Autodesk.<br />
•   Enabling saving project files in earlier versions of Revit (backward compatibility). Lack of this functionality (which is present in competitive BIM software – ArchiCAD) causes enormous problems with<br />
managing projects involving several companies, some of which may still be using earlier versions of the software. Lack of backward compatibility, force upgrades for all platforms on an annual basis<br />
makes firm operations difficult and expensive. Most projects (especially larger scale projects) span much longer than a year, resulting in drain in resources to maintain and monitor many platforms<br />
across different firms and disciplines to ensure compatibility.</p>
</li>
<li>
<p>Customer service<br />
Autodesk has been since long focused more on marketing its products, than on helping customers in using them to their best advantage. This resulted in:<br />
•   Oversupply of sales specialist, who do not have enough understanding of architecture and construction industry.<br />
•   Shortage of proper technical support staff – people who are software specialists and at the same time industry professionals and are able to apply Autodesk technology to real situations.<br />
•   Time consuming, complicated and completely ineffective system of dealing with customers’ requests and problems, which in extreme cases results in fixing a simple bug in Revit for several years (!).<br />
•   Complex licensing procedures, which add complications for the IT managers and limit end users from generating additional revenue stream from REVIT models.<br />
Such situation is very frustrating for us and also not beneficial for Autodesk in the long term. We are convinced that changing proportions and employing more technical staff who could also perform sales duties is a model, which would serve the community much better. </p>
</li>
</ol>
<p>All the above issues are only selected and most pressing examples of a long list of problems, which we have to face in our daily work. As it is not possible to present all of them in this letter, we would welcome Autodesk to establish a platform for presenting our concerns in detail through a series of meetings or workshops.<br />
We believe that the strong position in the market, which Autodesk still enjoys, should not be maintained by clever marketing strategies but by a real commitment to the users and by being responsive to our needs and requests – an attitude we have yet to observe.</p>

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