Putting encoders on camera cranes and dollies allows the exact position of
the camera to be instantly known or stored for future use in adding computer
graphics. Encoders are much more accurate than any other tracking method in
existence and so provide superior data for the CGI artist or compositor to work
with. Even with the numerous automated post-production tracking tools available,
the camera positional data is slow to generate, and not exact at best.
By using encoders one can instantly get extremely accurate data, down to
fractions of millimeters if necessary. There is no need to wait or process the
data, as the Flair software can output the
data in real-time and even do complex inverse-kinematics, ideal for
pre-visualisation or virtual studio effects.
The software can also store the data for later retrieval or export the data
to a motion control system for
shooting repeat passes. An excellent example of the latter was extensively used
on the film, "The Borrowers" where a large encoded crane was used to
shoot actors on green-screen. The data was then exported to a Milo
motion control rig which scaled the move and shot different actors in a real
set. The 2 takes were then composited together to make the huge difference in
scale between the 2 different actors.
The number of axes to record is almost unlimited, and all data
is synchronized to the film exposure is the camera. Software tools are available
for interfacing to a variety of CGI packages such as Softimage, Maya, and
Inferno.
The encoder mechanics can be adapted to fit almost any kind of camera dolly,
crane or jib, including Super Technocranes.
