Camera.rect  

var rect : Rect

Description

Where on the screen is the camera rendered in normalized coordinates.

The values in rect range from zero (left/bottom) to one (right/top).

// Change the width of the viewport each time space key is pressed
function Update () {
    if (Input.GetButtonDown ("Jump")) {
        // choose the margin randomly
        var margin = Random.Range (0.0, 0.3);
        // setup the rectangle
        camera.rect = Rect (margin, 0, 1 - margin * 2, 1);
    }
}