Datasheet

Motion Capture  19
6. Select mocap_GRP, and go to frame –13. Turn on Snap To Point. Press D, and snap
the group’s center to the root node of the motion-capture skeleton. With Snap To
Point still on, snap mocap_GRP to Jack’s root_JNT. e two skeletons are now
collocated.
7. To get the skeletons to stay collocated, you need to add a point constraint.
Shi+select root and root_JNT, and choose Constrain

Point. Reset the settings, and
choose Add.
Orient constraints would be the logical choice
to align Jack’s skeleton with the motion-capture
skeleton, but the likelihood of the motion-
capture skeleton being oriented with your skel-
eton is slim to none. e logical step is to apply
the orient constraint and maintain its oset. You
now have the tedious task of trying to align the
joints manually.
A better solution is to use single chain (SC) IK
handles. You can snap the IK handle to the end of
the bone you need to align with. Adding a point
constraint forces the handle to follow along. An
added benet of the SC handle is that you can
also constrain its orientation, allowing you to
replicate a bone’s twisting motion.
8. e best place to start is at the root. Turn on
Reference for the MOTION_CAPTURE layer.
9. Choose Skeleton

IK Handle Tool. Click Reset
Tool at the top of the toolbar to return the set-
tings to their defaults. Current Solver is set to
ikSCsolver.
10. In Perspective, choose root_JNT and then spine1_
JNT. Figure1.22 shows the results.
11. Turn o Reference for the MOTION_CAPTURE
layer, and turn on Reference for the SKELETON layer.
12. Shi+select upperback and ikHandle1. Choose
Constrain

Point. Reset the tool to use the defaults,
and click Add.
13. Select lowerback and ikHandle1, and choose
Constrain

Orient. Make sure Maintain Offset is
selected, and use the settings from Figure1.23.
Figure1.22
Add an IK handle to
root_JNT.
Figure1.23
Orient constraint
options
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