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Another way to look at this is to think about 2D scanning. I would imagine most have learned that to get the best reproduction of and old photograph is to scan it in at a very high resolution. So to print something at 300dpi you would try and scan at at least 1200dpi or 4x the output. The same idea applies to 3D scanning accept even more extreme, maybe 10x would be needed. ...
But you guys are talking about different things.Organic shapes like fruit or a tooth can be much better represented by a scan and the resulting mesh will be much easier to adjust to match the original object better.To get down to maybe the simplest issue, right angles. Obviously the drawing is very simplistic, but it's just to convey the idea. A scanner can only map what it sees. so in the drawing, if it can't see the two points in the red circles, it will take the next point it can see (the blue dot) and create the green line instead of the right angle line that should be there.A tooth or an apple won't be as affected by this slight angle change or cabe modified much easier if it's a dimensional issue, but multiply this 100 time across one of our models and you have a pile of mush.Jason
Teeth are actually quite hard to scan accurately with highly irregular surfaces, deep cuts and the death kneel, undercuts. But modern day scanners can hangle that easily. Your example above is assuming that the model is fixed and the laser is not highly articulated. Modern scanners articulate the object and the laser to give quite a bit of accurate coverage.
The problem with articulated scanning is now the information needs to be interpolated by the software. You're going to get different reference points for the same spot which won't exactly line up and the software needs to decide what to do.
Obviously much better, but I'm assuming the cost is up there. It's also a scan of something of decent size (a carburetor). We could debate if this would be usable as-is.Jason
That's not a problem. The software can handle that very easily. Check the scans at the end. They are for a full set but most of the time it's for one tooth or implant.
If you're using the resulting piece on 1/24th scale model, I'd say the carburetor would be more than useful, but at what cost?
And, when you scan you get a solid object and 3D printing gets expensive when its a large amount of material. Cad models normally are hollowed out.Juts my 2 cents! James
This guy in the UK goes to exhibitions, scans life size and creates 3D figureshttps://www.modelu3d.co.uk/3d-scanning/.