It is the regulated cycling of a specific set of images on an actor dependent on the current situation or conditions. If the situation changes or the conditions change, the image set may need changed. The regulating of the cycling of images controls how long each image in the set is to be displayed by the actor. So, one field required will be a timer int field to regulate the rate of changing of the images in the set. The information asked for was quite general in nature; that is, no details or specifics were given, as well as no code to work from. Therefore, no specific help can be returned.