First and foremost, would be the discussion of what are your exact goals with the scan. Do you need a fender surface scanned to make custom flares? Do you need precise dimensions for a turbo manifold flange? Do you need a general scan of a whole engine bay to create air intakes, air boxes, tanks, relay mounts, ducts, etc.? Each has their own specific approaches to ensure you get exactly what you are looking for.
3D Scanning
Every project begins with research, finding the best parts, processes, and techniques to ensure the best final product. A solid foundation is always an important requirement. Scanning, weather to replicate a part or build off of specific geometries, is that very foundation. Capturing details that would otherwise be impossible with CAD (Cardboard Aided Design) and eyeballing. Data being captured will include clearance and measurement details, surface and organic geometries, and an overall visualization of the entire assembly. Below will help break down the process.
Next in line would be the physical scanning of data. At first glance many might think that the scanning portion of a project is the "easy" part. Show up, wave a fancy wand around, and have it spit out a cool mesh file. Unfortunately, a few missed data points, low resolution captures, offset surfaces because of lost tracking can derail the whole design process. Parts won't fit together correctly, assembly fit clearances will bind, bolt patterns will be off, matting faces misaligned, the faults that occur can be endless.
Once we have the scan data saved there's usually a fair amount of post processing required. Deleting erroneous data, filling marker holes, smoothing surfaces, aligning multiple scans into one mesh.
Final Product
Once everything is processed you will be provided with the mesh file of your choosing. (.stl .asc .step .ply)
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