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An example of real object replication. |
3D scanning is a form of analyzing real-world objects or environments to gather data on it's shape. The gathered data is used to create it's digital representation, like the example on the right. This one was
3D printed too (a process I described in my previous post), so now we have an almost exact duplicate, it's just missing some color.
You can see how this process could be used to duplicate your favorite toys, but if any of you are scientists, you could use this technology to create exact replicas of fragile artifacts to display in museums.
But how does it work?
There are many ways to 3D scan an object, some are more expensive, some are faster, but it all depends on your object's shape and size.
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time-of-flight scanning |
I won't go into details, but one of the main technologies behind it is
Time-Of-Flight. The scanner points a
laser rangefinder into an object and it measures how much time it takes for the light to hit the object. If you can imagine this process, then you can probably imagine doing it thousands of times for each point of the object. When you have a complete map of how far the points are, you can easily (if you're a computer) put them in a
3D space and there you have it, an object appears. Of course if you have a stationary camera, you have to rotate the object to scan it from all sides. Just for info: Typical time-of-flight 3D laser scanners can measure the distance of 10,000~100,000 points every second. An example of this can be seen on the right.