Journal ArticleDOI
Spacetime constraints
Andrew Witkin,Michael Kass +1 more
- pp 159-168
TLDR
This work presents as examples a Luxo lamp performing a variety of coordinated motions that conform to such principles of traditional animation as anticipation, squash-and-stretch, follow-through, and timing.Abstract:
Spacetime constraints are a new method for creating character animation. The animator specifies what the character has to do, for instance, "jump from here to there, clearing a hurdle in between;" how the motion should be performed, for instance "don't waste energy," or "come down hard enough to splatter whatever you land on;" the character's physical structure---the geometry, mass, connectivity, etc. of the parts; and the physical resources' available to the character to accomplish the motion, for instance the character's muscles, a floor to push off from, etc. The requirements contained in this description, together with Newton's laws, comprise a problem of constrained optimization. The solution to this problem is a physically valid motion satisfying the "what" constraints and optimizing the "how" criteria. We present as examples a Luxo lamp performing a variety of coordinated motions. These realistic motions conform to such principles of traditional animation as anticipation, squash-and-stretch, follow-through, and timing.read more
Citations
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Proceedings ArticleDOI
Spacetime vertex constraints for dynamically-based adaptation of motion-captured animation
TL;DR: This work presents a novel technique for editing motion captured animation that produces physically plausible adaptated animations that satisfy alterations in foot and hand contact placement with the animated character's surroundings.
Dissertation
Motion planning : from digital actors to humanoid robots
TL;DR: In this paper, a three-stage strategy is proposed to solve the problem of generating motions for human-like figures that manipulate bulky objects while walking, and several interesting problems and their solutions are brought into focus.
Journal ArticleDOI
The virtual erector set: dynamic simulation with linear recursive constraint propagation
SchröderPeter,ZeltzerDavid +1 more
TL;DR: An algorithm for rigid body dynamics is implemented which unifies the advantages of linear recursive algorithms with theadvantages of earlier linear algebra based constraint force approaches.
Goniometric Light Reconstruction for Augmented Reality Image Synthesis
TL;DR: A new image-based approach for the reconstruction of light and material properties from a set of photographs and how to use anti-aliasing techniques to improve the display quality especially at the edges between real and synthetic objects is described.
Book ChapterDOI
Virtual Clay: Haptics-Based Deformable Solids of Arbitrary Topology
Kevin T. McDonnell,Hong Qin +1 more
TL;DR: This paper presents Virtual Clay as a novel, interactive, dynamic, haptics-based deformable solid of arbitrary topology, and formulate the mathematics of Virtual Clay through the integration of the geometry of subdivision solids with the principle of physics-based CAGD.
References
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Proceedings ArticleDOI
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