SCA '11:
Proceedings of the 2011 ACM SIGGRAPH/Eurographics Symposium on
Computer Animation.
Abstract
We
present a system for interactive kinematic editing of motion paths and
timing that employs various biomechanical observations to augment and
restrict the edited motion. Realistic path manipulations are
enforced by restricting user interaction to handles identified along a
motion path using motion extrema. An as-rigid-as-possible deformation
technique modified specifically for use on motion paths is used to
deform the path to satisfy the user-manipulated handle positions. After
all motion poses have been adjusted to satisfy the new path, an
automatic timewarping step modifies the timing of the new motion to
preserve the timing qualities of the original motion. This
timewarp is based on biomechanical heuristics relating velocity to
stride length and path curvature, as well as the preservation of
acceleration for ballistic motion. We show that our system can be used
to quickly and easily modify a variety of locomotive motions, and can
accurately reproduce recorded motions that were not used during the
editing process.
