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SpokenText:
Figure 10: We automatically generate an emitter from user drawn motion
paths (red). (a) First, we find the perpendicular line (light green)
to the motion path and its intersection (light green) with the convex hull.
Then, we push this line and its intersections (dark blue) outside the object
area (dark gray). (b) From these initial points (light blue), we expand
the emitter until particles completely cover the object area. These
final dark blue points are the end points to the emitter. (c) When the user
adds multiple motion paths, the endpoints (dark green) are averaged to
create the light blue points. The line connecting these light blue points is
pushed outside the object area. (d) The initial points contract to tightly
cover the object area with emitted particles.