Thursday, April 3, 2014

3D Scanners - What are the Options?

[This post represents a collaboration between me, the teacher, and a number of my middle school students.  It continues to be a work in progress!]

While CAD is fun, I am keenly interested in students' capturing their own data to work with and print.

So, we looked into a couple of ways we could make this happen:

    1. Photogrammetry is the science of making measurements from photographs - geometric properties (gives texture, and is dynamic). Photogrammetry relies on triangulation (Using triangles to determine the XYZ coordinates of a voxel) to make a 3-D model of an object An example of this is Autodesk 123D Catch which allows you to take about 70 pictures of an 3-D shape
              and make a 3-D model of it.   

    2. Laser line 3D scanning is a non-contact method of capturing the shape of a 3 Dimensional object. It uses a laser and 1 DSLR camera. If  you have the camera the cost can run as low as $20. The laser allows you to use triangulation because it creates a known angle in relation to the camera.

    3. A structured-light 3D scanner is a 3D scanning device for measuring the three-dimensional shape of an object using projected light patterns and a camera system. Good tutorial

    More notes we are working on:
    • utilize a 3D scanner (some DIY models run as low as $300 / higher end models run into the $1000s)
    • Makerbot Digitizer
    • (new) Structure Sensor - a Kickstarter for a mobile scanner for your iPad.
    • (added11.12.13) 3D Systems Sense 3D scanner - just heard about it, need to learn more
    • visit a local makerspace that may allow you to run your own scans on their equipment
    • use a service like Autodesk123DCatch - - where you send in a series of 2D photos (taken in class) and they send back a file with a 3D reconstructed constructed model.

    Time-of-Flight Scanners
    Triangulation Scanners
    Structured-light Scanner
    Stereoscopic Scanner
    Photoscopic Scanner
    Silhouette Scanner

    structured light vs laser CCD
    David Laser Scanner
    CadScan 3D (now called Cubik)

    Other things to watch:

    Open Source CT scanner (cool!)

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