Common Issues in IFC File Editing and How to Address Them

Receiving an IFC file with exploded geometries, missing data, or incorrect coordinates is a frustrating but common experience for those working in BIM. Faced with these errors, the instinct is to “open and correct,” but the IFC is not a simple CAD file: it is a structured and complex database.

Treating it like a modifiable drawing is risky: improper editing can corrupt the data and compromise the entire OpenBIM workflow. Why is it so difficult to intervene on these files? And how can errors be resolved without making the situation worse?

In this article, we will analyze the technical criticalities of IFC editing, the most frequent problems encountered, and the operational solutions to manage and correct models safely and professionally with an IFC editor.

Why IFC file editing presents critical issues

Why IFC File Editing Presents Challenges

Working with the IFC (Industry Foundation Classes) format is now the standard for those operating in the OpenBIM field. However, many professionals face frustrations and obstacles daily when trying to edit these files. To understand how to resolve these issues, it is essential first to grasp the very nature of the format and why it was not designed to be “edited” in the traditional sense of the term.

IFC as an Exchange Format, Not a Modeling Format

One of the most common conceptual mistakes is treating an IFC file as if it were a native file format, such as a .rvt from Revit, a .pln from Archicad, or a .edf from Edificius. However, an IFC file is not a native file.

By definition, IFC is an exchange and archiving format, designed by buildingSMART International as a static “snapshot” of a model at a specific point in its lifecycle. Think of it like a PDF in the world of text documents: while you create the document in Word (the authoring software), you save it as a PDF to ensure that anyone can view it without the risk of altering its content or layout.

Attempting to model or heavily modify the geometry within an IFC file is technically challenging because the data structure is not parametric in the way that authoring software is. When software exports to IFC, it translates its internal rules (walls, windows, parametric relationships) into standardized definitions (often explicit geometries like Brep or ExtrudedAreaSolid). Breaking this “seal” to modify the geometry often means having to manually rebuild the logical relationships that the format has simplified to promote compatibility.

Direct Editing vs. Correct OpenBIM Workflow

The challenge in editing often arises from a non-optimal workflow. There are two main approaches:

1. the “wrong” approach (Destructive Editing): you receive an IFC, notice an error (e.g., a wall shifted by 10 cm), open the file with a generic editor or attempt to re-import it into the modeling software, make the modification, and re-export. This cycle, known as Round-tripping, is highly discouraged. Each import and export step involves a “translation” of the data that almost inevitably leads to information degradation (loss of properties, corruption of geometries, loss of classifications);
2. the correct OpenBIM workflow: in an ideal process, the IFC should never be geometrically modified by the receiver. If there is an error, the report must go back to the model author (via BCF format – BIM Collaboration Format), who will correct the native file and generate a new updated IFC.

However, the reality on-site and in the office often imposes exceptions. Sometimes the author is unavailable, or there is a need to enrich the file only with informational data (without touching the geometry) for Facility Management or computation purposes. This is where editing becomes a surgical and delicate operation, requiring specific tools and the awareness that we are forcing the “static” nature of the format for operational needs.

Common Issues in IFC File Editing and How to Resolve Them

Once it is understood that the IFC was not designed to be modified, it is easy to see why, when attempting to do so, things can go wrong. Anyone who has tried to manipulate an IFC file has likely encountered at least one of the following scenarios, which represent the most frequent “bottlenecks” in the OpenBIM workflow.

Data Loss and Geometry Issues

This is the classic nightmare of the BIM Specialist: you open an IFC file, and the model seems to have “exploded” or is incomplete. This often happens during attempts at conversion or modification. Curved geometries (like curved walls or complex piping) can be tessellated, turning into a series of difficult-to-manage flat polygonal faces.

Even more insidious is the loss of non-geometric data. During improper editing, hierarchical relationships (e.g., IfcBuildingStorey containing IfcWall) can break. The result is a model that visually appears correct but is “flat” at the data level: objects no longer know which floor they belong to or lose logical connections with other elements.

Difficulties in Modifying Properties and Informational Data

Often the need for editing is not geometric but informational (the so-called “BIM Data Enrichment”). There is a desire to add a parameter, such as an installation date or maintenance code. The problem arises because many IFC viewers are read-only, and authoring software (when importing the IFC) tends to map IFC properties to non-modifiable or difficult-to-manage proprietary parameters.

Modifying a Pset (Property Set) standard or creating a custom one directly on the IFC requires specific editors. Doing it “by hand” or with unsuitable tools often leads to property duplication or the creation of data sets that do not comply with the buildingSMART standard, rendering the file unusable for subsequent automatic validations.

Interoperability Issues Between BIM Software

Interoperability is the promise of OpenBIM, but it is also its Achilles’ heel if not managed correctly. Each software (Revit, Archicad, Edificius, etc.) has its internal “language” for interpreting the IFC schema.

A common problem is the different interpretation of classes. An object modeled as a “Wall” in one software might be interpreted as a generic “Proxy” (IfcBuildingElementProxy) in another if the class mapping has not been configured upstream. This makes editing impossible: you cannot modify the thickness of a wall if the software reads it as a generic solid block lacking parametric intelligence.

IFC Model Visualization Issues

Sometimes the file is technically correct, but the viewer fails. There are phenomena of Z-fighting (surfaces flickering because they overlap), transparent elements becoming opaque, or colors not matching the original.

These visual problems make editing difficult because the user is unsure whether they are seeing a real model error or a graphical malfunction of the software. Often, trying to “fix” a visual error that does not actually exist in the file’s database leads to damaging the model itself.

Incorrect Management of Coordinates and Misalignment Between Models

This is perhaps the most critical issue in multidisciplinary projects. When attempting to edit an IFC or federate it with others, one realizes that the model “flies” in space or is rotated abnormally.

The IFC manages coordinates rigorously (Project Base Point, Survey Point, Site Local Placement), but if the person who exported the file did not correctly configure the origin, or if the editor inadvertently moves the local reference system, misalignment is guaranteed. Correcting coordinates directly within an IFC is a complex mathematical operation that, if done manually, almost always leads to millimeter positioning errors that are fatal for Clash Detection.

Too Complex IFC Files: Slow Performance and Crashes

An unoptimized IFC file can weigh hundreds of megabytes or even gigabytes. Attempting to edit such a file brings even the most powerful workstations to their knees.

The problem often lies in geometric redundancy (e.g., screws and bolts modeled in very high detail but unnecessary for coordination) or an inefficient data structure. Opening, waiting for loading, making a small modification, and saving can take an eternity, making the editing process economically unsustainable and increasing the risk of software crashes, resulting in file corruption.

Missing Data: Properties, Classifications, Key Information

Finally, a classic problem is the absence of essential data. You receive an IFC that is geometrically perfect, but it is an “empty box.” Classifications (UniClass, OmniClass) are missing, materials are absent, and thermal properties are lacking.

Editing here becomes a massive Data Entry job. The problem is that entering this data manually, element by element, on an IFC file is unthinkable. Without batch editing tools (group modification) or automation scripts, enriching an IFC lacking information is a high-risk activity for human error and time-consuming.

Most common issues in editing and managing IFC files

Operational Solutions and Best Practices for Resolving Issues

Faced with the critical issues just analyzed, the temptation to abandon the IFC and return to proprietary formats can be strong. However, there are specific strategies and tools that transform IFC management from a nightmare into a controlled and efficient process. Here’s how to intervene professionally.

Use Dedicated IFC Editors for Targeted Modifications

The golden rule is: do not use authoring software (BIM Authoring Tool) to edit an IFC. Software like Revit, Archicad, or Edificius are designed to create models, not to modify existing IFC files without converting them.

For surgical interventions on data or geometry, it is necessary to use native IFC editors or dedicated data management platforms (such as Simplebim, usBIM.editor or BlenderBIM). These tools work directly on the IFC schema without destructive conversions.

The advantage of using these tools is that they allow you to modify properties, move objects, correct classifications, or “trim” the model while keeping the original file structure intact and ensuring that the subsequent export is clean.

Correctly Configure IFC Exports

Prevention is the best cure. Most editing problems can be resolved upstream by correctly configuring the Model View Definition (MVD) during the export phase.

• geometry: choose the correct geometric representation. For coordination, it is often better to export simplified geometries (Coordination View) rather than ultra-high-fidelity models that weigh down the file;
• mapping: ensure that the categories of the native software are correctly mapped to IFC classes (IfcWall, IfcSlab, etc.) before exporting. A well-structured file from the start drastically reduces the need for downstream corrective editing.

Correctly Manage Coordinates and Reference Systems

To avoid “flying” models, it is essential to establish a common origin point (Project Base Point) and share it among all disciplines before starting modeling.

• best practice: during export, always check whether the software is using project-relative coordinates or georeferenced coordinates (Survey Point);
• post-export solution: if you receive a misaligned file, instead of moving the geometry manually (risking errors), use the “Placement Editor” tools available in advanced viewers or IFC editors to modify only the transformation matrix of the IfcSite or IfcBuilding, realigning the model without touching the geometry of the objects.

Optimize IFC Files Before Use

A “raw” IFC file coming out of authoring software is rarely ready for final use. It often contains digital “junk”: invisible objects, duplicate properties, or excessively detailed geometries:

• normalization: use validation and normalization tools to clean the file. This process includes removing unnecessary objects (e.g., interior furnishings for structural analysis), simplifying geometric meshes, and standardizing property names;
• result: you obtain lighter files that load faster and are much more stable during visualization or computation operations.

Common Mistakes to Avoid

Even with the best intentions, it is easy to fall into procedural errors that compromise the integrity of the BIM project. Avoiding these missteps is crucial for maintaining a healthy and productive OpenBIM workflow.

Treating IFC as a CAD File

This is the most ingrained cultural error. Many operators, accustomed to the DWG/DXF format, try to manage the IFC as a set of lines and layers.
The IFC is an object-oriented database. “Exploding” an IFC file or attempting to manipulate it as if it were pure geometry means destroying the intelligence of the model. A wall is not just two parallel lines and a hatch: it is an entity (IfcWall) with thermal, acoustic, and relational properties. Treating it like a CAD block means losing the “I” in BIM (Information), rendering the file useless for any advanced analysis.

Mass Editing Without Control

Using scripts or “Find and Replace” tools on a large scale can be devastating if not managed carefully.
Massively modifying parameter names or property values without adequate filters can overwrite critical data or, worse, alter the GUID (Globally Unique Identifier). The GUID is the unique “identity card” of each object: if it is modified or accidentally regenerated during mass editing, the traceability of the object in subsequent revisions is lost, and links with computation or time management platforms (4D/5D) are broken.

Using Continuous IFC Import/Export Cycles

As mentioned at the beginning, the so-called Round-tripping (Create with software A -> Export to IFC -> Open the IFC with software B -> Export to IFC -> Open the modified IFC with software A) is a practice to be absolutely avoided.
Every time an IFC file is imported into authoring software and then re-exported, it undergoes an “interpretation” by the conversion engine. This process is similar to the game of “telephone”: by the third or fourth conversion, the geometry will be degraded, properties will be incorrectly mapped, and the file will likely be corrupted. The IFC should always be the endpoint or transit format, never the continuous working format.

Ignoring Versions, Plugins, and Software Updates

The IFC ecosystem is evolving. Continuing to export to IFC 2×3 when the client requires IFC4, or using outdated exporters, is a serious technical mistake.

Authoring software (like Revit, Archicad, or Edificius) frequently releases updates for their IFC export plugins, which fix bugs and improve geometry mapping. Ignoring these updates means fighting against problems that have already been resolved by developers. Always check to have the latest version of the export plugin and agree on the version of the IFC schema (MVD) at the beginning of the project is the first step to avoiding headaches during delivery.

FAQ on Issues Caused by IFC Editing

Why does editing IFC files present challenges?

The most widespread conceptual error is treating an IFC file as if it were a native file. The IFC is, by definition, an exchange and storage format, conceived as a static ‘photograph’ of a model. Attempting to model or heavily modify the geometry within an IFC file is technically challenging because the data structure is not parametric in the way that authoring software is.

What is the difference between direct editing and the correct OpenBIM workflow?

The ‘wrong’ approach (Destructive Editing) involves the import/export cycle (Round-tripping), which causes data degradation. The correct OpenBIM workflow stipulates that the IFC should never be geometrically modified by the recipient; corrections must be made on the native file by the author. However, for data enrichment needs (BIM Data Enrichment), specific tools can be used for targeted modifications without touching the geometry.

What are the most common problems in IFC file editing?

The most frequent problems include: data loss and tessellation of curved geometries; difficulties in modifying informative properties; interoperability issues due to different interpretations of classes between software; visualization errors (Z-fighting); incorrect management of coordinates with misaligned models; overly heavy files causing crashes; and missing data such as classifications or materials.

How to resolve IFC file editing issues?

The main solutions are: use dedicated native IFC editors (like Simplebim or usBIM.editor) instead of authoring software for targeted modifications; correctly configure exports (MVD and class mapping) upstream; rigorously manage coordinates (Project Base Point) and use ‘Placement Editors’ for realignments; optimize and normalize files by removing unnecessary objects and duplicate properties.

What are the common mistakes to avoid in IFC management?

The mistakes to avoid are: treating the IFC as a CAD file (exploding geometries and losing information); mass editing without control risking altering GUIDs; using continuous import/export cycles (Round-tripping) that corrupt the file; ignoring the correct versions of the IFC schema and not updating export plugins of the software.