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Qualitative Physics in Angry Birds : first results

Angry Birds is a well known game in which the main aim is to destroy all pigs located in a given level using a slingshot and birds of various kinds. In most cases pigs are positioned among other objects building blocks, rocks or specifically profiled ground whose behaviour reflects the laws of physics. The game rewards chariness of a player the less birds she uses and the more damage she does to the whole structure in the level, the higher score she gets. In our paper, we attempt to indicate the essential factors playing role in the process of destruction. Thus, we provide definitions of influence (which we further divide into two categories horizontal impact and vertical impact), stability and connection points. Whereas the latter two can be evaluated regardless of what shot we will actually take, the former requires an assumption about the shot and it is counted by means of iterative analysis involving two central concepts propagation of force (in the case of horizontal impact) and center of rotation (in the case of vertical impact). The ultimate goal of the whole procedure is assigning each object which is reachable by a shot a numerical value expressing the scale of damage it does once hit. The playing program is then supposed to shoot at the object with the highest value.