Doc:2.6/Manual/Game Engine/Logic/Sensors

Sensors

Sensors are the logic bricks that cause the logic to do anything. Sensors give an output when something happens, e.g. a trigger event such as a collision between two objects, a key pressed on the keyboard, or a timer for a timed event going off. When a sensor is triggered, a positive pulse is sent to all controllers that are linked to it.

The logic blocks for all types of sensor may be constructed and changed using the Logic Editor; details of this process are given in the Sensor Editing page.

The following types of sensor are currently available:

Actuator	Detects when a particular actuator receives an activation pulse.
Always	Gives a continuous output signal at regular intervals.
Collision	Detects collisions between objects or materials.
Delay	Delays output by a specified number of logic ticks.
Joystick	Detects movement of specified joystick controls.
Keyboard	Detects keyboard input.
Message	Detects either text messages or property values
Mouse	Detects mous events.
Near	Detects objects that move to within a specific distance of themselves.
Property	Detects changes in the properties of its owner object.
Radar	Detects objects that move to within a specific distance of themselves, within an angle from an axis.
Random	Generates random pulses.
Ray	Shoots a ray in the direction of an axis and detects hits.
Touch	Detects when the object is in contact with another object.