Sorry Hugues, I thought that's what the patterns were called in white light scanning :?

Do a test scan and wait for the black and white vertical stripes to show up when the scan is running, these varying in width. when I did my first free scan I was too far away, and these had "fuzzy" edges. Although the scan info (shape) was OK, the texture wasn't right. The casting looked melted, but as soon as I moved it closer to the calibration distance, things improved. I then started to move the scanner closer to get detail further inside the object (hollow casting), once I got the external shape defined.
It worked a lot better for me this way, but I haven't done a lot with it since, as I need to make an articulating boom and fit a permanent Mini Arca quick release adaptor to the base of the scanner.

neveroddoreven, I haven't seen that pattern, but haven't been looking, but then I never seen the cross yet either!

Mike