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How to Create Revit Models from Point Clouds


Building Information Modelling (BIM) methodology is increasingly penetrating into building design. It will also lead to an inevitable increase in the demand for BIM modelling in the existing building stock. A point cloud is a set of data points within a coordinate system. The points defined by x, y and z coordinates in 3D space, represent the outer surface of an object. These points are plotted using a 3D scanning process.  The 3D map of points is then imported them into specialist software which can interface with our 3D building modelling systems. 

The precision and accuracy of the point cloud mapping system ensure that it is an extremely useful tool to digitally represent existing conditions. It creates a “real world” depiction of what’s going on with our site, so there is no guesswork or time-consuming hand measure-ups needed. If we are designing a building that connects onto an existing one, we essentially have highly accurate existing drawings, but in 3D!

Point Clouds support our design by allowing us to design around an actual site setting, making us accurately detail and model existing buildings. This helps in Revit with things like phasing, cost planning, constructability, and detailing.

Point Cloud Data can be inspected and rendered and it aids the creation of 3D models but it is not a substitute for a 3D model. To make scanned data BIM worthy, it is first indexed and further surfaces are generated. This process is known as surface reconstruction where scanned and indexed data is converted into a triangle mesh model. Create Mesh holds a lot of potentials to assist with remodelling, renovation and even historic preservation projects.
The second new feature is Auto Find Walls and this intends to take much of the tedium out of the modelling an existing building. Instead of letting the user sort through millions of the points that represent a single wall, the Auto Find Walls feature will provide the first pass.
With 3D Scanning becoming much more affordable, it is highly recommended to get a point cloud for a project containing existing buildings. The accuracy of a Point Cloud and subsequent model can save time with site visits and measure ups. This does not just aid the Modeller in the office but assists the contractors on site. They can easily find their set out points from what they can see on a tablet, rather than trying to locate items from 2D plans. Linked with on-site scanners, it will provide accurate setouts for off-site prefabrication and checking of construction installation, as well as as-constructed information for facility managers and owners.
For more details: Cadeosys

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