2010

Table Of Contents
In this lesson, you learn how to change the positioning of the camera and
locators within the Maya scene. You typically need to do this so you can more
easily model and animate objects you want to match up with the live shot.
You will learn how to:
Create a variety of survey constraints.
Apply survey constraints to the solution.
Evaluate the solution with imported geometry.
Even if you do not have survey measurements, you can use estimates to change
the spacing between locators and their orientation within the Maya scene.
Creating a Distance constraint
Live has a variety of survey constraints. As your first example, you will create
a Distance survey constraint. The Distance constraint defines the distance
between two tracked points. Based on that one distance, the solver can establish
the distances between all the locators.
To create a Distance constraint
1 Open the Live scene you created in the previous lesson.
2 In the Solve control panel, click the Survey option to open the survey
constraint settings.
3 Choose Distance from the Constraint Type menu.
Now youll need to specify two points that you want to constrain to a
distance.
4 To help select the points, open the Outliner (Window > Outliner).
5 Select the following track points in the Outliner under
clip1TrackedPointVisibilityGroup > clip1TrackedPointGroup:
fenceCorner
tileInFront
6 In the Solve Survey control panel, click Create.
7 Enter 2 in the Distance setting.
With this constraint, Live will force the locators for fenceCorner and
tileInFront to be 2 units apart. Live does not incorporate the constraint
Creating a Distance constraint | 1003