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

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.

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”.
    

Perform Surface Analysis

• Now that the points have associated to our CAD, we can perform surface analysis.
  • Select “Evaluate > Surface Deviation Analysis”.
  • 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  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.
    
    

Create Annotations

• Now, annotations are needed to represent the deviation we see between the scans and CAD.
  • Select “Evaluate > Surface Inspection Annotation”.
  • Select scan points to annotate, then select Apply  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  to create the report.