CATEGORY: BIM

Model corruption in Revit can happen. We noticed a common trend about what causes these issues and have compiled possible solutions to implement into your project or firm’s workflow, to reduce the risk of corruption and down-time. In another article we’ve discussed, What Causes Revit Data Corruption? In this article, we will focus on one of the worst instances of model corruption.

“The model {filename}.rvt is missing many elements, and cannot be opened.”

This error indicates corruption in Arch, Struct, or MEP Revit families, where the application does not allow anyone to open the project file. This can affect both projects using or not using Worksets and Worksharing. This message appears when there are more missing elements than Revit will ignore. If there are just a few missing elements, Revit ignores them and attempts to continue opening the model. If there are too many missing elements, the file is unrecoverable and the team will have to restore a previous version of the file or a local file.

There are instances where the Microsol Resources support team can open a case with Autodesk and have the file repaired. Sadly, this does not happen often.

However, sometimes the error only occurs when the ‘audit’ option is checked when opening the file. We will proceed with the understanding that we are able to open the model and that the error appears when ‘Audit’ is checked.

The following are two images of the error message we’ve seen.

Revit Error & Possible Causes

Elements in your project are corrupt, causing Revit to report the missing elements.  Here is our tutorial on troubleshooting.

1. Collect backup files for your local and detached central.
2. Identify the elements. In the Revit Journal for this session, it is common that the families causing the issue can be identified.
3. The element corruption may exist in a linked RVT.
   If the linked file has many missing elements and the link cannot be loaded, Revit may present the missing elements warning.
4. One user is running a different build of Revit.
   They have not installed the same updates that the rest of the team is using.
5. Packet Loss
   A communication interruption between the local file and the central file. Most likely due to poor internet or network connection.
6. Too many warnings
   Try to minimize warnings to the best of your ability, especially the following warnings:
   • Any error that indicates a problem that will affect area or volume calculation. Volume requires much more calculation than area.
   • Highlighted walls are attached to, but miss, the highlighted targets
   • Highlighted elements are joined but do not intersect
   • Area or Room separation line is slightly off-axis and may cause inaccuracies
   • Highlighted lines overlap. Lines may not form closed loops and it’s variations
   • Stair errors.
   • Duplicate and Overlapping Elements.
7. Upgrading an old model/family
   Up until Revit 2016, there were certain elements that ended up getting their IDs changed in 2017. Things like fonts and stairs/railings, in particular, got changed and caused a lot of issues.

Possible Solutions

1. Open the model without Audit Check
2. Identify the missing elements
3. Replace the missing elements from a backup or stable file.
4. Export Families using Save as / Save as Family / Save as Library
5. Import families that illustrate errors during the Save as Library process.
6. Find a user with a working local copy, or the most recent backup without the error, and move forward with the recovered model.

The premise is that this error is caused by one or more corrupt family components. So the solution is to extract all families from an un-corrupted archive of the model (un-corrupted here means that one is able to open the model with an ‘Audit’ check) and load those families into the corrupted version of the model. This overwrites all family definitions including corrupted versions and thus rids the project of the error. Family extraction from a project can be automated by going to Save As > Library > Family.  We need to find a stable family or repair the issues identified in this warning.

The image below was captured during this process, a warning pops up indicating the family is problematic in some way. I moved the warning error box to the lower left of the Revit interface, in order to see and capture the warning next to the status bar. This information and the right Revit journal file can help identify potential problems in the family being exported.

The warning dialog has an option to export the warning, the element ID, and the addressable issue.

However, the challenge with this approach is that large projects contain hundreds of families, and loading them manually becomes tedious. We can automate the process either by using a macro or a dynamo script. Reach out if this is something your team needs.

Once the corrupt family has been identified, one can re-open the model and locate the family in the Project Browser and delete the family (via right-click), or replace the family with an un-corrupted version from the library or archive.

The project should open without error after this (when ‘Audit’ is checked). If there is more than one corrupt family, this process will have to repeat as many times as needed since each run of the Family Size Reporter will crash when processing the first available corrupt family.

Missing Elements Hosted on BIM 360

If the missing elements message is received for a Cloud Workshared model hosted on BIM 360, then the process would be the same (restore a previous version of the model and replace any family corruption). However, the corruption could be isolated to the locally cached copy of a model or link, particularly if the issue is limited to just one user. In this circumstance, the solution is far simpler:

To clear a corrupt/damaged cloud workshared model or outdated link from the system:

1. 1. Create a folder called Cache on the Desktop.
   2. Move the PacCache and CollaborationCache folders to the folder created on the desktop.
      • Collaboration cache folder location C:\Users\%USERNAME%\AppData\Local\Autodesk\Revit\Autodesk Revit ####\CollaborationCache
      • PacCache folder location C:\Users\%USERNAME%\AppData\Local\Autodesk\Revit\PacCache
   3. Open the problematic file in Revit.
      • Note: This will recreate the cache and clear any corrupt/damaged cloud workshared cache data.
   4. Open the Desktop folders from Step 2 and the original folder location of the Cache files.
   5. Move the files that were not recreated back into the original Cache folders.​​​​​​
      • Note: If none of the files are moved back into the original cache folders, the cache for other projects will need to be recreated which will slow down the initial time it takes to open the file.

An alternate approach, if you have access to a second system:

1. On the second system, open Revit.
2. Sign in to your own A360 account.
3. Open the problematic model.
4. Copy the newly created CollaborationCache files from the second system to the original system (overwriting).

If the method above does not work, then the more complete Alternate Sledgehammer Approach may help.

1. With Revit closed, rename the CollaborationCache folder.
   • Note: This will force all model data to be re-cached. If the model can open, then it confirms that the locally cached copy was corrupt. If the issue persists, then the cloud model has become corrupt and will need to be rolled back to a previous version.

Preventative Care

For all Revit projects, Microsol Resources and Autodesk, inc recommended regularly open and audit your Revit model (daily, or weekly) to ensure that any damage or corruption is addressed as soon as possible. It is also important to address warnings to reduce the overall risk of model corruption. Please see our other blog, Revit Project Maintenance Guidelines. Consider taking a class with us, perhaps Revit Family Creation, Online

Extra Help from Microsol Resources

If you are still having persistent issues, you can create a support case and our Technical Team will try and assist you.

ASK FOR SUPPORT

A hybrid course might be the right choice for you if you are looking for a way to supplement your traditional live classes with the flexibility of on-demand classes. With the hybrid course, you can go back and re-watch or review the information that you are having difficulty with.

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CADLearning for Autodesk® Character Generator teaches the use of Character Generator, an online application that provides users a quick and simple way to create 3D human-based characters. The content in this course has been devised to help users quickly learn how to create and modify characters complete with rigging and texture maps that can then be used immediately in animation software such as Autodesk® 3ds Max® and Autodesk® Maya®.

CADLearning for Civil 3D® teaches the use of Civil 3D as a surface construction modeling tool for infrastructure professionals. The content in this course has been devised to help users quickly learn the most efficient methods for designing a surface model, starting with points and working toward a completed corridor.

CADLearning for Autodesk® Collaboration for Revit teaches the use of Collaboration for Revit (now called Autodesk BIM Collaborate Pro), a cloud-based worksharing service that allows team members from multiple disciplines, locations, and firms to collaborate by providing centralized access to Revit models. This content has been devised to help users quickly learn how to leverage the power of the worksharing and communication features in C4R with Revit.

CADLearning for Autodesk® Design Review teaches the use of Design Review, which allows users to view, mark up, print, and track changes to 2D and 3D views of designs, without the original design software. The content in this course has been devised to help users quickly learn the most efficient methods for working with and marking up views of DWG™ and DWFx™ files.

CADLearning for Dynamo Studio covers the fundamental use of Dynamo. Dynamo Studio is a free program from Autodesk that uses visual programming to create its own geometry with parametric relationships. It can also read and write to and from external databases. Dynamo is a stand-alone program, but it can also be used as an add-on to Revit, the premier BIM tool from Autodesk.

CADLearning for Autodesk® InfraWorks® teaches the use of InfraWorks as an infrastructure design, modeling, and presentation tool. The content in this course has been devised to help users quickly learn how to use real-world data to convey design intent within existing conditions, in real-time via the cloud.

CADLearning for Autodesk® Insight® teaches the use of Insight, a building analysis simulation tool that integrates with Revit and FormIt Pro to produce insights of whole-building energy analysis, heating and cooling loads, daylighting analysis, and solar radiation analysis. The resulting insights can represent millions of potential outcomes at once. The content in this course has been devised to help users quickly learn how to generate a range of potential design effects, in real-time via the cloud.

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CADLearning for Autodesk Product Exam Preparation covers all of the topics included in the certification guides and exam objectives as described and provided by Autodesk. Realize that the lessons presented are a subset of the full CADLearning for Autodesk products, and prerequisite knowledge is needed to obtain a full mastery of the topics and exam objectives. Test taking skills as well as time management is also covered.

CADLearning for Product Installation teaches users how to install their Autodesk® software. The tutorials in this course have been devised so that users can properly install both stand-alone and network installation deployments, to get up and running with their Autodesk product as quickly as possible.

CADLearning for Autodesk® Revit® covers the use of Revit, the premier Building Information Modeling (BIM) tool for design and construction professionals in the Architecture, Engineering and Construction industry. This content has been devised to help users quickly learn BIM methods for creating and modifying geometry, organizing data, performing analysis, and presenting designs using the specialized functions within Revit.

CADLearning for Autodesk Revit for Architecture covers the use of Revit as an architectural and construction modeling tool. Revit is the most popular architectural design tool from Autodesk, with capabilities for modeling, analysis, documentation, and collaboration. Beginner, Intermediate, and Advanced users will learn the core and architectural functions of Revit as it works within the world of Building Information Modeling, or BIM.

CADLearning for Autodesk® Revit® for MEP covers the use of Revit, the premier Building Information Modeling (BIM) tool for engineering and design professionals in the industries of construction and architecture. The content in this course has been devised to help users quickly learn BIM methods for creating and modifying geometry, organizing data, performing analysis, and presenting designs using the specialized MEP functions within Revit.

CADLearning for Autodesk® Revit® for Structure covers the use of Revit, the premier Building Information Modeling (BIM) tool for engineering and design professionals in the industries of construction and architecture. The content in this course has been devised to help users quickly learn BIM methods for creating and modifying geometry, organizing data, performing analysis, and presenting designs using the specialized structural functions within Revit.

CADLearning for Autodesk Storm and Sanitary Analysis teaches the use of the Storm and Sewer Extension within Civil 3D as a hydraulic water analysis tool for a new or existing wastewater industry model for planning, rehabilitation, maintenance, and network extensions. Lessons cover how to design a gravity storm or gravity/pressure sanitary sewer model and then analyze the design for optimization of the system. The Storm and Sewer Extension for AutoCAD Civil 3D assists users in the creation of storm water reports, watershed analysis, hydraulic pump design and hydraulic analysis of streams, rivers, and storm sewers.

CADLearning for Autodesk Vault Basic covers the use of Vault as a data management tool. Lessons cover how to better share data, control versions, and manage revisions. Using Vault ensures accountability among users, provides file security and ease of reuse, and tracks a history of each design when used in conjunction with Autodesk design products.

CADLearning for Autodesk® Vehicle Tracking covers the use of the Vehicle Tracking integrated software for creating and perfecting transportation-related designs in conjunction with Civil 3D. The content in this course has been devised to help users quickly learn the most efficient methods for modeling and testing vehicular behavior within the confines of a proposed design.

Summary

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Interested to try out the CADLearning on-demand platform, you can request your free 30-day trial today.

If you have questions or need additional information, please contact our Training Coordinator, training@microsolresources.com.

Let’s Talk

Augmented reality (AR), virtual reality (VR), and mixed-reality (MR) represent both disruption and an opportunity for people who make things. Using these technologies, you can transform 2D designs into interactive, immersive digital models, giving context to your digital information.

So how does AR, VR & MR work? When do you use these technologies? How are people using it, and what are the benefits?

Read this article to get an introduction to these technologies and find out how it is reshaping the world of design.

How does AR, VR, and MR work?

Augmented Reality

AR adds digital elements to the real world and projects them onto your line of sight. Using AR, workers can view an overlay of 3D models and project information at a job site.

Virtual Reality

VR replaces the real world with a simulated one in 3D. With VR, you can experience a simulation of a factory you’ve designed—with machines running—all before it’s built.

Mixed Reality

MR is a hybrid of virtual reality and augmented reality. Using MR, you can touch a real table and use it as an interface to manipulate a digital model.

When do you use AR, VR & MR?

Conceptual Design

What AR & VR tools do you need?

Enscape integrates seamlessly into your current design program from Revit to Rhinoceros, SketchUp, Archicad, and Vectorworks.

One-click starts Enscape; you are just seconds away from walking through your fully rendered project – no uploading to the cloud or exporting to a separate program. Any changes you make in your CAD program are instantly visible in Enscape.

Summary

More than just cool technologies, augmented reality (AR), virtual reality (VR), and mixed reality (MR) are changing how we design, create and experience everything.

For more information, please reach out to our visualization team at enscape@microsolresources.com.