2010

Table Of Contents
The Playblast movie is an approximation of how the rendered sequence
will appear. In this movie, you can look for subtle mismatches between
the model and the background, such as momentary jitter.
NOTE As an alternative to the Playblast, you could play the animation in
Maya, provided you allocate enough memory in the Setup Cache control
panel. If you have memory allocated for all 240 frames, the playback will be
as fast and accurate as the Playblast movie. When using Playblast, youll need
approximately 20 Mbytes of free space in your computers temporary
directory.
Beyond the lesson
In this lesson you learned how to apply survey constraints to improve the
overall solution. Survey constraints are useful not only for orienting your
solution, but also for the initial creation of a solution. In these lessons, you
solved using track data alone. In more complex shots, the solver may fail
unless you use survey constraints to broaden the information that the solver
can use.
You cannot tell in advance which survey constraints are needed to solve a
shot so it is a good idea to plan for some of the survey constraints before you
start tracking. A common example is the Plane constraint, because most shots
have coplanar or approximately coplanar points in them.
Do not add too many estimated survey constraints, as they may conflict with
each other. When you create a Plane constraint for points that are only
approximately coplanar, we recommend you turn on Registration Only in the
Solve Survey control panel. This option keeps the solver from forcing the
points to be perfectly coplanar.
Maya Live includes other constraints such as camera constraints and infinite
points to help with solving. Camera constraints help control the focal length,
translation, and rotation of the solved camera. You set them in the Solve
control panel Camera settings.
Infinite points are tracked points that you designate as infinitely far from the
camera, such as a cloud, mountain, or any feature in the distant background.
Knowing a point is infinite, lets the solver use it exclusively for calculating
camera movement. Infinite points are helpful for zoom shots, when the camera
is static.
For further information and related techniques on Maya Live, refer to the
Maya Help.
1010 | Chapter 20 Live