Interactive Editing of Human Locomotion on an Arbitrary Motion Path

摘要

This paper introduces an interactive editing system for a human locomotion which considers quantitative and qualitative aspects of motion and suggests two editing processes to generate a convincing output animation. Based on a minimal set of sample locomotion clips containing only straight motion paths, an animator controls a character's motion path and stylistic posture changes during the editing processes. During quantitative editing, our system generates a locomotion sequence following a curved motion path specified by an animator. Key-times of foot strikes are detected automatically for each sample in order to specify motion cycles which are appended and interpolated for a continuous and smooth output sequence. Additionally, the system provides a timing interface in order to specify temporal points of transition from one sample to another. In addition, qualitative editing is supported by incorporating a procedural system which provides a set of controllable parameters to facilitate posture editing. Initiated with a sample clip, this process produces motion that differs stylistically from any in the sample set, yet preserves the high quality of datadriven motion. A post-processing step enforces foot constraints, and modifies the character's posture to account for important physical forces acting on the body while navigating a curved path. As shown in the experimental results, our system provides intuitive interfaces for editing motion capture clips and generates realistic locomotion at interactive speed.