Space-Time Sketching of Character Animation
ACM Transactions on Graphics (SIGGRAPH 2015), Volume 34, Number 4, page 118:1--118:10 — jul 2015
We present a space-time abstraction for the sketch-based design of
character animation. It allows animators to draft a full coordinated
motion using a single stroke called the space-time curve (STC).
From the STC we compute a dynamic line of action (DLOA) that
drives the motion of a 3D character through projective constraints.
Our dynamic models for the line's motion are entirely geometric,
require no pre-existing data, and allow full artistic control. The resulting
DLOA can be refined by over-sketching strokes along the
space-time curve, or by composing another DLOA on top leading
to control over complex motions with few strokes. Additionally,
the resulting dynamic line of action can be applied to arbitrary
body parts or characters. To match a 3D character to the 2D
line over time, we introduce a robust matching algorithm based on
closed-form solutions, yielding a tight match while allowing squash
and stretch of the character’s skeleton. Our experiments show that
space-time sketching has the potential of bringing animation design
within the reach of beginners while saving time for skilled artists.
Images and movies
BibTex references
@Article{GRGC15, author = "Guay, Martin and Ronfard, Remi and Gleicher, Michael and Cani, Marie-Paule", title = "Space-Time Sketching of Character Animation", journal = "ACM Transactions on Graphics (SIGGRAPH 2015)", number = "4", volume = "34", pages = "118:1--118:10", month = "jul", year = "2015", ee = "http://dl.acm.org/citation.cfm?doid=2809654.2766893", doi = "10.1145/2766893", url = "http://graphics.cs.wisc.edu/Papers/2015/GRGC15" }