Animation is a good tool for a better perception of physical processes and systems both in the case of dynamic systems (e.g. spin waves) and in the case of complicated 3D structures (e.g. complex lattices). Animations can be classified to the fixed viewpoint ones and to the changing viewpoint ones. When a dynamic system is illustrated, a fixed viewpoint animation is needed, since the system itself is changing. If the system has a 3D complicated structure, a changing viewpoint animation is needed for a better perception of the 3D structure. When a dynamic system with complex 3D structure is illustrated the combination of both types is needed. The way of making one type of animation is somewhat different then the other. Hence there are different directions:
fixed viewpoint animationchanging viewpoint animation
The process in general is creating a sequence of png image files (by Aviz) that, in turn, will be converted to an mpeg or a gif movie file using the proper software.