Compix Persona - Manual (Page 122)

Chapter 6 Page Mode
Document No: 2.3.004 Revision: 2.0 Updated: 3/21/2012
Tension
Tangent of Graph
In general, the speed of an object is slow at the beginning and end of its movement. The
motion of an animated title created in Compix Persona can simulate this same movement
of a real object. When recording the change of this object’s motion every second, the graph
should look like Picture A below.
When motion is affected by gravity, the object accelerates and deccelerates in a parabolic
motion. As an example, if a heavy object is thrown straight up, its speed decreases at its
vertex and increases as it falls back down. When recording this motion every second, the
graph should look like Picture B below.
Changing the line graph’s slope relates to the speed of an animation. When the line is flat-
ter, the values for speed increase more slowly than when the line is steeper.
The Tension of a line, as mentioned above, can be adjusted here by changing the graph’s
tangent lines. The two pictures below, Graph A and Graph B, correspond to the two pictures
above, Picture A and Picture B, respectively. By observing this change in Tension from
Graph A to Graph B, it is easy to understand the relationship between motion and graph
manipulations of an object.
Picture A Picture B
Slow Fast Slow
Graph A
Slow Fast Fast
Graph B
Compix Persona
122