The gravity gun, however, cannot manipulate heavier objects and enemy characters until the late stages of the game, when the device becomes temporarily infused with dark energy meant to destroy it. Certain types of objects, such as saw blades, fuel barrels and hydrogen tanks are intentionally designed by Valve to be used as 'gravity gun ammunition'. Using the secondary trigger again will drop the item, while the primary trigger will launch it with considerable force.īy combining these functions, players can use the gravity gun to scale barriers and obstacles, create cover against enemy characters, or launch the objects at enemy characters, causing them considerable damage. The secondary trigger attracts the targeted object to the gun and holds it in midair a few inches away, negating its weight and allowing the player to carry it with them. The distance which the object is forced is dependent on its weight and distance from the gun. The primary trigger causes the gun to emit a small discharge which emits energy to the targeted object.

Like most other weapons in the game, the gravity gun has two trigger functions.

The gravity gun significantly increases the player's ability to manipulate objects in the game.

She explains to Gordon that she once found it useful 'for clearing minefields'. Alyx Vance explains that the gravity gun is designed for handling hazardous materials, but is mostly used for heavy lifting. Around a quarter of the way through the game, the player acquires the gravity gun, properly named as the ' Zero-point Energy Field Manipulator'. Although the player can pick up and throw objects early in the game, this ability is somewhat limited in scope. The physics engine within Source is derived from Havok, which opens up a wealth of possibilities for object interaction – particularly when later in the game, Freeman receives an energy-beam weapon that lets him move huge objects. Valve's Half-Life 2 made significant use of physics, powered by the Source engine.

Half life 1 pistol