Graphics Reference
In-Depth Information
space or a gaping hole where there
should be mesh.
overexposed or underexposed images,
as they hide the features you are trying
to capture.
Direct light alters the exposure by creat-
ing shadows and reflective spots. The
more consistent the exposure of the
photographs is, the more consistent
your model will be. We found that many
of our best Catches were shot on over-
cast days or at dusk. Consider planning
your outdoor Catches around these light
conditions for best results.
Maintain depth of field, focus, and
orientation
Blurry images will not produce accurate
Catches. Review your images before
leaving the scene of the Catch, and if any
of them are blurry, retake the images
before submitting the photos for pro-
cessing. On the iPhone/iPad, you can
review and retake images before sub-
mitting them for processing. If you are
using a digital camera, make sure to re-
view your images before leaving the
scene of the Catch.
In addition, your images must have a
consistent
depth of field
. If you are fo-
cused on the item you are Catching and
the background is blurry in your photos,
keep this consistent throughout the
shoot. Also keep the orientation of the
photos consistent. Choose either por-
trait or landscape and stick to it.
How many pictures?
More pictures are not necessarily better.
What is important is the regular intervals
and the capture of the overlapping an-
gles of the object. Many pictures will
take much longer to process, and if they
are not capturing the object uniformly
they will still produce poor results. The
Figure 6-6.
Take photos every 5-10 degrees around
the object
Fill the frame
Try to fill the camera frame with your im-
age (
Figure 6-7
). It is helpful to work con-
sistently from high to low, and from left
to right. This will help you to identify er-
rors (should they occur) later, after the
models are created. Once you start cap-
turing frames, avoid zooming in or out.
Zooming distorts your capture and may
make it impossible for the application to
align your set of images.
Figure 6-7.
Right way—image fills the frame
Uniform light
Make sure there is uniform light around
the thing you're trying to Catch. Avoid
