Model Validation using AutoCorr, Revit and BIMcollab

MMA Consulting Engineers recently completed a large scan to BIM project which involved generating Revit BIM models from laser scan data for retail stores around Ireland. A key part of their project involved using BIM & Scan AutoCorr™ for their model validation.
Without AutoCorr™ there is no easy way to validate that the models they generated from scan data are correct and within the required tolerance. The alternative involves manual checks (such as overlaying point clouds, and spending multiple hours ‘walking’ the model) that is time consuming, subjective and can easily result in critical issues being missed.

The Revit Modelling Team

The team of Revit technicians used a custom AutoCorr™ workflow to constantly check that their modelled BIM geometry and classifications were correct and within tolerance to the point cloud.

AutoCorr™ automatically creates a colourised point cloud highlighting any differences between a model and point cloud greater than a specified tolerance (see Figure 1).

Figure 1. AutoCorr™ colourised point cloud highlighting anything out of tolerance or not modelled in red.

AutoCorr™ also automatically creates BIM Collaboration Format (BCF) issues with viewpoints to easily track issues (see Figure 2).

Figure 2. AutoCorr™ BCF issues visualised using BIMcollab ZOOM software.

The results provided certainty to the team showing that their work was correct and immediately highlighted areas and objects that were left to be modelled. Any incorrect model components, were highlighted by AutoCorr™, and a modeller was able to quickly spot and correct it. This greatly speeded up the overall modelling process as it made it easier and quicker for Revit users to check their work in addition to highlighting remaining items that they had left to model.

The Project Manager

The project manager used AutoCorr™ with BIMcollab & BIMcollab ZOOM to track progress. The automatic colourised point cloud from AutoCorr™ showed exactly what areas were left to be modelled in addition to highlighting anything that was out-of-tolerance and that needed to be corrected.

BIMcollab, a cloud-based issue collaboration platform was used to track and manage model issues between the different project team members. BIMcollab ZOOM software was used to visualise the AutoCorr™ results which included the colourised E57 point cloud and BCF issues with viewpoints.

The QA Team

The MMA Team’s workflow meant that the quality and completeness of the models were constantly being checked with AutoCorr™, consequently the final QA process involved minimal work. The final models were quickly validated to make sure nothing was missed and everything was modelled within tolerance to the highest quality – ready to be issued to the client.

The MMA Team takes the extra step of issuing the AutoCorr™ results along with the models to the client as proof of the quality of the model. This provides assurance to the client and also lays a great foundation for a Digital Twin of the facilities.


MMA’s use of BIM & Scan AutoCorr™ for model validation on this scan to BIM project resulted in huge time and cost savings in addition to removing the subjectivity around the quality and completeness of the final models issued to the client.

AutoCorr™ provided evidence that nothing was missed, and everything was modelled within tolerance.

MMA considers AutoCorr™ an essential tool for scan to BIM projects.

BIM Tools Mentioned in this Article:

1.   BIM & Scan® AutoCorr™

A cloud-based solution used for comparing IFC models to E57 point clouds within a user specified tolerance.
Find out more about AutoCorr here: Click here
To request a trial: Request a trial

2.   BIMcollab Issue Management

The cloud-based issue collaboration platform for managing BCF issues that AutoCorr™ finds and BCF files you (might) already have from each stakeholder.
Click here to create a free account.

3. BIMcollab ZOOM

A popular validation tool and perfect for visualising AutoCorr™ inputs and results (IFC, E57 and BCF files).
Click here to download for free.

Figure 3. Screenshot from BIMcollab ZOOM with an AutoCorr™ colourised point cloud highlighting anything out of tolerance or not modelled in red.