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862 Chapter 14: Character Studio
Biped limbs with only one degree of freedom
(DOF), such as forearms and lower leg s, are
controlled w ith a single TCB/Euler curve.
Tangent Euler Rotation cur ve
Note: Props are not supported with the Euler
controller.
Rotation curves on a biped (including its center of
mass) are a lways set in local parent sp ace, whether
they are controlled in Euler or quaternion.
The XYZ function curves of an Euler rotation
track are locked together. This means that creat ing
anewkeyononeaxisautomaticallydoessoforall
axes. Also, moving a key in time drags all three
axes with it.
Displaying Position Curves
Bezier posit ion curves are available only for the
biped’s hands, feets, and center of mass (COM).
Handsandfeets’positionsaresetinworldspace
while the COM position is set local to the world.
FK/IK key blending is illustrated as follows:
• Full lines represent IK periods.
• Gaps between line s represent FK periods.
• Vertical dotted lines represent a change in pivot
points.
Note: Keys set to Join to Prev IK Key (p age 2–758)
are locked in value until the next un-joined key.
Tip: The Workbench and Curve Editor are
synchronized so changing the curve display from
the
Workbench toolbar (page 2–864) also updates
thedisplayfromtheCurveEditor,aswellas
activate the corresponding tool from the
Biped
Toolbar (page 2–513)
.
Cur v e Conver sion B etween Quater nion
and Euler
When an animation converts f rom one controller
to the other, its integrity is maintained as much
as possible. This means that despite variations in
key inter polation results, the keyframed poses are
preserved.
If you convert a quaternion rotation curve to Euler,
the resulting tangent keys are set to Smooth. If,
on the other hand, y ou switch an Euler rotation
curvetoquaternion,thebezierinterpolationfrom
the tangents is maintained as much as possible.
However, if that interpolation is too extreme and
can not be matched by TC B values, it is then
reduced to fit under quaternion limits.