of the vessel. Each section also has hard points of various size (small, medium, large, and special) to which weapons can be attached. The game's combat model uses a hybrid 2D/3D model that has the user controlling the battle on a 2D plane but allowing the ships to move in three dimensions automatically (such as to avoid collisions). Weapon accuracy is determined by the size of a cone of fire; more accurate weapons have tighter cones of fire. Shots are then tracked from initial firing until they hit maximum range; in this, it is possible for a projectile to hit something it was not even aiming at, or for a shot that might have missed to hit as an opposing ship maneuvers itself into the line of fire. Damage is applied to the affected section or turret, depending on the location hit. The game tracks individual polygons, making it possible to target very specific areas of an enemy ship, such as individual turrets. Research There are hundreds of technologies to research in Sword of the Stars, a few of which are also unique to each of the game's alien races. Aside from a number of core technologies, most other technology tracks are randomized at the start of the game, so that there is some uncertainty with respect to which technologies will be available to the player in any given game. Probabilities are weighted by race and influenced by the racial back stories. For example, the Liir are proficient in the field of Biotech. Research is funded as a portion of an empire's income, and can be adjusted via a slider. Development The game was developed by Kerberos Productions, which was formed by a group of former Barking Dog Studios employees who had earlier worked on the game Homeworld: Cataclysm, an expansion to Relic Entertainment's space real-time strategy game Homeworld. The game was in development for more than two years with a budget of $1.5 million. A total of three expansions were released in addition to numerous free patches and updates. The first expansion, Born of Blood, was published in 2007, and introduced a new race, the Zuul, as well as new features, namely trading and commerce raiding and in the case of the Zuul, slave raiding. A bundle of the "gold" edition of the original game and this expansion pack, along with a bonus disc featuring, among other things, concept