[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:
- 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
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)
- xbox Kinect, which can be easily hacked to serve as a 3D scanner - ReconstructMe and of Skanect - now available in a Mac version (as of 8/12/13)! You can read this Adafruit tutorial to learn more.
- Matterform - view their Kickstarter project.
- 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 - http://apps.123dapp.com/catch/ - where you send in a series of 2D photos (taken in class) and they send back a file with a 3D reconstructed constructed model.
structured light vs laser CCD
Open Source CT scanner (cool!) http://makezine.com/magazine/make-38-cameras-and-av/open-source-ct-scanner/