I think the reason that the white letters on the circuit board are raised is due to the material of the board itself. It's made of paxolin or epoxy, both are a bit translucent. You can see it if you hold such a board against light. Only the parts where the copper on the backside wasn't etched are
completely opaque. Therefore some laserlight can infringe into the board and isn't reflected just at the surface where the letters are printed. But this is only an idea. Perhaps I am completely wrong. We should check it with different materials.
Thanks cnc Dave
for your offer to recreate my house of polyurethane with your 3D plotter. But one house is sufficient for me.
Back to my outdoor scan:
Yes, I did the reference scan as usual and was then able to scan everything which was in front of the camera. This isn't quite correct of course: The camera and the laser were focused to a target about 50 cm away. Objects more fare away wouldn't be adapted so precisely due to the depth of focus of the camera and the laser. But more important is the fact that objects which are fare away aren't be illuminated by the laser at all! Think of the intersection angle of about 30°. The calibration corner should have circa the same size as the object.
It isn't allowed to re-focus the camera after the reference scan!
I had used the Logitech Pro 9000 which has a very wide-angle lens. This kind of lenses have the feature to have a large depth of focus. That means if I would have pivoted the tripod head to the frontdoor I could have scanned it if the laser beam would have hit it (in the camera image). Not pin sharp of course. The lower light back reflection of objects more fare away could be easily compensated after the reference scan in the camera settings.
Yes, the nameplate was scanned with one slow sweep.Mattia
, the intention to scan a complete car is a great thing. In the true sence of the word. But you are an Italian, why not to start with a Fiat ?
We are very curious and cross our fingers for a fine weather in Milano.