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“The laser scanning is probably the biggest leap forward,” Mr. Kaemmer said, referring to the three-dimensional mapping process the company has used to build digital facsimiles of more than 60 tracks. It’s a painstaking process; it takes about eight hours for a scanning crew to cover half a mile of track. But when the scan is complete, iRacing has a “point cloud” picture that mimics, within millimeters, the track surface, including every crack, patch and bump.