Modeling Walls from a Point Cloud in Revit
Most people know the benefits of a laser scanner when it comes to a renovation of an existing site. It is a great way to gather information on existing conditions for projects. The information gathered from the laser scanner can produce an accurate point cloud model of the object or building being scanned. This information can then be taken and imported into Revit to start the process of modeling. As with just about any project the first objects to be modeled are the walls. The biggest problem with modeling existing conditions or as built conditions of an existing building, is that walls are rarely straight. They are often slanted or even leaning. This is where communication is important between the company providing the model and the person receiving it. There needs to be an understanding on the owner’s part that the model will not be 100% accurate. The best practice is to sit down with the owner and go over expectations versus what can actually be modeled from the point cloud and to what degree of accuracy. With walls a standard needs to be established with both parties involved. If the wall is not straight, should it be modeled as is or should the wall be modeled straight and centered at the middle of the wall. Same goes for walls that are leaning. Typically it is fine to model walls that are not lined up straight, but impractical to model every wall that may be leaning. A point cloud model in Revit showing the wall negative space. When deciding what size walls to use its always best to measure the negative space where a wall should be. The measurements should be taken from just inside of where the point cloud stops. Since a laser scanner only scans the surface of an object, any material applied to the inside of the wall will be based on assumptions, or on previous discussed materials for the project. A section view of a wall. The height of the wall can be determined from a section view. It’s easy to measure from the floor to the visible top of the wall. It is also fairly easy to work in a 3D view of the project and use the section box to crop down the view to the specific item being worked on. Modeling walls from a point cloud can be a relatively simple process. The thickness and height of the wall should be the only things that need to be measured from the point could. Then simply model the wall in the space where it is supposed to go. The most important tip is to communicate with the owner. Insuring that the model is successful by their standards. -Written by ATG Team Augmentation Specialist Zachary Barker. Applied Technology Group is a Platinum Autodesk Business Partner. Founded in North Little Rock, Ark., in 1992 as a local computer services company, ATG has grown to become a leading design technology partner with the purpose of assisting customers in maximizing the value and adoption of advanced technologies so they can perform competitively in the AEC sector. ATG collaborates with customers across the Gulf South, Midwest and Southwest through partnerships with 3DR, Autodesk, Leica, Microsoft and Panzura. Learn more about our company at www.atgusa.com. Autodesk and the Autodesk logo are registered trademarks or trademarks of Autodesk, Inc., and/or its subsidiaries and/or affiliates in the USA and/or other countries.