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FARO® Knowledge Base

Verify Constructed Object to Intended CAD/BIM Model with BuildIT Construction



Using BuildIT Construction QC to verify constructed objects verses designed CAD or BIM.

You’ll learn:

  • A simple workflow for analyzing the scans verses a model.
  • Opening BuildIT, opening a BuildIT file and manipulating the viewport
  • Associating surfaces from the model to the point cloud.
  • Performing surface analysis of the scan data verses the CAD data.
  • Creating annotations of the analysis.
  • Creating a report from the annotations and analysis.

Tutorial Download

If you would like to download the file used in this article, download the accompanying Training Data and extract its contents to a folder on your PC.

Training Data Download

Set a View Without the Roof

Open the “Module 9.buildit” file by selecting “File> Open” and navigating to where the file is saved.

  • To set a view without the roof in the way.
    • Click View/ Set View. Use the clipping box option to hide the points and CAD data for the roof.
    • This will result in the following view. Save this view as “Without Roof”.

Associate Scan Data to CAD Surfaces

  • Now the scan data should be associated to CAD surfaces. This allows the software to only perform analysis with scan points that are near CAD surfaces, speeding up the process.
    • Select “Refine > Auto Associate”.
    • Select Cloud1 for “Clouds”.
    • For Geometries, select the box and then the “Beams” under the nominal area in the Manager. This represents the layer of beams in the CAD file.
    • Enter “BEAM” for the “Cloud name suffix”.
    • Ensure “Exclude points farther than” is checked with a value of 24 inches. This option will only search out up to 24 inches for points to associate. If the cloud is farther than 24 inches, it will be ignored.
    • Select “Apply”. ApplyIcon.png

Perform Surface Analysis

  • Now that the points have associated to our CAD, we can perform surface analysis.
    • Select “Evaluate > Surface Deviation Analysis”. SurfaceDeviationIcon.png
    • For “Surfaces”, select in the area to start the selection. Then, switch to the manager and select “Beams” from the nominal/CAD. This will pull all points associated to the surfaces.
    • Set the “Maximum Search Distance” to 24 inches, mirroring the distance set in the Associate command.
    • Select Preview PreviewIcon.png to review the analysis.
    • For “Color scale”, set it to Rainbow – Red-Green-Red. This will make points that are out of tolerance yellow to red and points that are within tolerance green.
    • For “Analysis mode” select “Colored cloud”.
    • For the “Limits” change to “User-defined” The tolerance used for this exercise will be 6 inches. Enter 6 for “Upper tolerance” and -6 for “Lower tolerance”.
    • Select Apply. ApplyIcon.png

Create Annotations

  • Now, annotations are needed to represent the deviation we see between the scans and CAD.
    • Select “Evaluate > Surface Inspection Annotation”. SurfaceInspectionAnnIcon.png
    • Select scan points to annotate, then select Apply ApplyIcon.png to create the annotation, or Middle Mouse Click.
    • Once several annotations have been created, use Set View to save a view with the annotations. Name it Deviation Analysis.

Create a Report from the Annotations and Analysis

  • Include the items created on a report.
    • Select items to include in the report.
      • Include the two views created, the analysis, and the annotations.
    • Right click and select “Add to Report”.
    • If the items are not in the intended order, they can be moved up or down by selecting and dragging the item.
    • Select Run GenerateReportIcon.png to create the report.


Congratulations, you have completed the Verify Constructed Object to Intended CAD/BIM! By now you should have a grasp of how to:

  • A simple workflow for analyzing the scans versus a model.
  • Opening BuildIT, opening a BuildIT file and manipulating the viewport
  • Associating surfaces from the model to the point cloud.
  • Performing surface analysis of the scan data verses the CAD data.
  • Creating annotations of the analysis.
  • Creating a report from the annotations and analysis.
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