1.0 Key Performance Points
a. Motion Arc
The ball’s falling trajectory is not a straight line but rather a curved arc. During production, the curve adjustment tools in a graphic editor can be used to refine the path, making the motion more natural and closer to real physical laws.
b. Speed Variation
As the ball falls, its speed gradually increases, creating the effect of acceleration. After making contact with the ground, its rolling and spinning gradually slow down until it eventually comes to a complete stop.
c. Timing of Deformation
The ball does not deform at the very beginning. Instead, deformation such as squash and stretch occurs at specific stages—typically when it hits the ground or experiences impact. As it rises again, the ball returns to its normal shape.
d. Energy Decay
Over time, the ball’s energy gradually diminishes. In the animation, this should be shown by the decreasing height of each bounce and the shortening of the distance between landing points, until the ball finally comes to rest.