Starting from the external edge, a series of concentric vertices were created to give the illusion of spherical head. The largest mesh, head-base, is used as a reference when weighting all the smaller meshes relative to it. The depth effect is added by weighting a mesh to these two opposite bones, as illustrated in the Cube tip. This results in the target control-back bone moving in the opposite direction of the control bone: The effect is accomplished using a transform constraint that lets the control-back bone follow the control bone with a translation mix set to -100. The other two bones, control and control-back, are used to create the 2.5D effect. The head bone controls the owl's head and can be used to easily translate, rotate, and scale the entire head. The head is composed of several images that are connected to 3 bones. The skeleton contains only a handful of images so focusing on the setup of the 3D effect and poses becomes easier.
The project also employs techniques to give the skeleton a 3D look. Additive animation blending lets you create effects such as blending multiple facial expressions, such as 25% angry, 25% sad, and 50% happy. The Owl project shows one way to take advantage of additive animation blending.
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