There are two ways to implement animation in Warzone.
You can make flip through a stack of textures to implement animation. They need to be lined up in the texture page horizontally, and the offset and number of frames to cycle through are specified in the model file.
See the PIE format specification for details.
Currently implemented for structures and droid bodies (which includes cyborg feet). You can specify animations that trigger on movement, structure activation (only implemented for Power Generator so far), shooting, and dying.
See the PIE format specification for details.