Human Animation Part II

1
HumanAnimationPart II

• Computer Animation SS2007

2
Walk Cycle

• Action can be ...
• Computed dynamically
• A cycle of poses (keyframes)?
• Sampled
• Individual poses are not always statically stable

3
Walk Cycle
4
Walk Cycle
5
Walk CyclePelvic Transport

• Pelvis is supported by the stance leg at various
  points during the stance phase

6
Walk CyclePelvic Rotation

• Pelvis rotates about vertical axis centered at
  the stance leg
• This helps to lengthen the stride

7
Walk CyclePelvic List

• To reduce the amount of lift, the pelvis lists
  (tilts) by rotating in the coronal plane

8
Walk CycleKnee Flexion

• Bending the knee joint (flexion) allows the swing
  leg to safely pass over the floor and avoid
  contact

9
Walk CycleAnkle Toe Joints

• Ankle bends as foot is placed
• Toe joints bend just before liftoff

10
Walk CycleVideos
11
Run Cycle
12
Run Cycle
13
Run Cycle

• Here's an example of the run cycle animated
• Watch how sometimes both feet are off the ground

http//www.erain.com/img/RunCycle.swf
14
Comparison

• Rise and fall of body identical
• Greater body tilt in run cycle
• At least one foot on surface at all times for
  walk cycle, but not for run cycle

15
Reaching Grasping

• Also called Reach-to-Grasp
• Reaching
• Moving a hand (effector) towards a object (goal)?
• Utilizes inverse kinematics
• Grasping
• Closing fingers about an object (goal)?
• Demands mute contact points

16
Reaching GraspingHand Shaping

• Begins with the initiation of the reach and
  continues adjusting throughout the reach to match
  specific object properties
• Grasp aperture tends to scale to object size
  during the reach