Blend Shape with Quaternions

Animating 3D organic models to achieve compelling re- alism is a challenging task in the entertainment industry. Skin deformation based on an underlying skeleton is a com- mon method to animate believable organic models. The most widely used skeletal animation algorithm is linear blend skinning (LBS). We present a linear blend skinning technique using quaternion for deforming the skin geometry of the body of a digital creature around its skeleton. A case where blend shape is driven by Euler angle, we may even encounter gimbal lock. Our basic idea is to use quaternion representation as driven parameter for skin blend shape.