In this work, we introduce a novel space-time sketching concept enabling
an animator to draft a full coordinated movement—that includes
shape deformation over time—by sketching a single stroke.
Further strokes can be used to progressively refine the animation.
While strokes have been used in the past to specify both temporal
and spatial iso-values of motion—with static lines of action (LOA)
serving as shape abstraction at a given time as well as trajectories
describing the successive positions over time of a single point—
space-time sketching was never used to define animations. In our approach, we allow the user to control both the shape and trajectory
of a character by sketching a single space-time curve (STC).