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Viewline Length Absolute When on, the software uses only the Viewline

Length setting for the length of the main viewline; the distance between the

constrained object and the target(s) has no effect.

Set Orientation Lets you define the offset orientation of the constrained

object manually. When on, you can use the Rotation tool to set the constrained

object’s orientation. This orientation is then maintained as the constrained

object looks at its target.

Reset Orientation Sets the orientation of the constrained object back to the

default. This is useful if you want to reset the constrained object’s orientation

after having set the orientation manually.

Select LookAt Axis Use to define the axis that looks at the target. The X,Y,Z

check boxes reflect the constrained object's local coordinate system. The Flip

check box reverses the directions of the local axes.

Select Upnode The default Upnode is the World. Turn off World to manually

select an object that defines the Upnode plane. This plane is drawn from the

constrained object to the Upnode object. If the LookAt Axis and the Upnode

axis coincide, the constrained object will flip. Animating the position of the

upnode object will move the upnode plane.

Upnode Control group:

Lets you quickly flip between LookAt Upnode Control and Axis Alignment.

LookAt When selected the Upnode matches the LookAt target.

Axis Alignment When this is selected the Upnode Aligns to the object axis.

Choose which axis (X, Y or Z) in the Source Upnode Alignment group directly

below Upnode Control.

Source/Upnode Alignment group

Source Axis Chooses the constrained object’s axis that is to be aligned to the

Upnode Axis. The Source Axis reflects the constrained object’s Local Axis. The

Source Axis and LookAt Axis work together therefore the Axis used to define

the LookAt Axis will be unavailable.

Aligned to Upnode Axis Chooses the Upnode axis that the selected Source

Axis aligns to. Note that the selected Source axis may or may not be able to

completely align to the Upnode Axis.

3318 | Chapter 15 Animation