Graphics Reference
In-Depth Information
web-based application, an app for the iPad
and the iPhone, and a desktop application
for Windows. It works by taking multiple dig-
ital photos that have been shot around a sta-
tionary object and submitting those photos
to a cloud-based server for processing. The
cloud server uses its superior processing
power to stitch together your photos into a
3D model and then sends the model back to
you for editing. You can download or access
123D Catch at http://www.123dapp.com/
catch .
123D Catch Tips
The quality of the scan that you receive from
123D Catch is dependent on the quality and
consistency of the photos you provide. Here
are some general tips on how to select ob-
jects to Catch and how to plan out your Catch
so that you obtain desirable results:
Objects to avoid
When choosing objects to scan using
123D Catch, avoid reflective surfaces
( Figure 6-4 ), objects with glare, and mir-
rored or transparent surfaces. These ob-
jects will not work well for generating 3D
models. For example, windows that are
reflecting light will appear warped or
bowed, like funhouse mirrors. Transpar-
ent objects like eyeglasses will appear as
holes in the model.
Figure 6-3. A mesh
Limitations
The limitations of 3D scanning depend on
what technology is being used. For example,
optical scanners have trouble scanning
transparent or shiny objects, and digitizing
probes can only scan the top surface of an
object. All the software programs discussed
here also have strengths and weaknesses.
What software you use to scan your model
depends on the size of the model and your
computer's hardware configuration. Two
popular applications are 123D Catch and Re-
constructMe. This chapter tells you how to
use both of these. Each of these scanning
packages has its own set of advantages and
limitations.
In the past you needed to use a high-end
scanner and expensive software, but thanks
to these free programs, you no longer need
to spend big bucks to get printable scans.
Figure 6-4. Avoid shiny objects—they will not Catch
well
123D Catch
123D Catch is a free application from Auto-
desk that enables you to take photos and
turn them into 3D models. It is available as a
 
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