Example-based motion generation of falling leaf

In this paper, we present an algorithm which can be used to produce stylized and expressive falling leaves animation. In this algorithm, leaf´s falling motion is divided into two factors: movement trajectory and leaf´s posture on each point of the trajectory, which is accord with creation idea of animation artist. We describe the example leaf´s non-rigid posture changes by using combination of affine transformation and key-shape interpolation. By example-based trajectory synthesis of falling leaf and transferring example leaf´s posture information to new leaf, we can produce a new falling leaf animation with appearance and movement trend suitable for user´s requirement with the movement details and postures of example animation. This method can realize the style reuse from classical animations. Furthermore, it can improve the efficiency of effective production.