lerp : Phaser.Point
The linear interpolation value to use when following a target.The default values of 1 means the camera will instantly snap to the target coordinates.A lower value, such as 0.1 means the camera will more slowly track the target, givinga smooth transition. You can set the horizontal and vertical values independently, and alsoadjust this value in real-time during your game.
Source code: core/Camera.js (Line 109)