Smooth Camera Zoom with Mouse wheel

Unity Engine
1

Hi

Iv been looking around for a smooth zoom script for my orbit script but i cant find any.

This is what i have now:

var target : Transform;
var distance = 10.0;

var xSpeed = 250.0;
var ySpeed = 120.0;

var yMinLimit = -20;
var yMaxLimit = 80;

private var x = 0.0;
private var y = 0.0;

var smoothTime = 0.3;

private var xSmooth = 0.0;
private var ySmooth = 0.0;
private var xVelocity = 0.0;
private var yVelocity = 0.0;

private var posSmooth = Vector3.zero;
private var posVelocity = Vector3.zero;

@script AddComponentMenu(“Camera-Control/Mouse Orbit smoothed”)

function Start () {
var angles = transform.eulerAngles;
x = angles.y;
y = angles.x;

// Make the rigid body not change rotation
if (rigidbody)
rigidbody.freezeRotation = true;
}

function LateUpdate () {
if (target) {
x += Input.GetAxis(“Mouse X”) * xSpeed * 0.02;
y -= Input.GetAxis(“Mouse Y”) * ySpeed * 0.02;

xSmooth = Mathf.SmoothDamp(xSmooth, x, xVelocity, smoothTime);
ySmooth = Mathf.SmoothDamp(ySmooth, y, yVelocity, smoothTime);

ySmooth = ClampAngle(ySmooth, yMinLimit, yMaxLimit);

var rotation = Quaternion.Euler(ySmooth, xSmooth, 0);

// posSmooth = Vector3.SmoothDamp(posSmooth,target.position,posVelocity,smoothTime);

posSmooth = target.position; // no follow smoothing

transform.rotation = rotation;
transform.position = rotation * Vector3(0.0, 0.0, -distance) + posSmooth;
}
}

static function ClampAngle (angle : float, min : float, max : float) {
if (angle < -360)
angle += 360;
if (angle > 360)
angle -= 360;
return Mathf.Clamp (angle, min, max);
}

Please help point me in the right direction.

2

Smoothing is all in using current and desired correctly. This is a piece out of another script that I just put on the forum.

currentZoom=Mathf.Lerp(currentZoom, zoom, 0.05);

This is fairly easy to implement.

3

Bear in mind, of course, that the Lerp would have to use Time.deltaTime in the call if you want to have it be equally fast and smooth on all framerates.

4

Won’t currentZoom never actually reach zoom like that, in accordance with Zeno’s paradox? I always feel dirty lerping like that.

5

Hi just to give you an example what im after check this out… http://www.kolmich.at/kolmich/demo/kvf/omegacity/kvf_omegacity.html
Anyone have a modified orbit cam script with smooth move and zoom on mouse wheel?

6 
    public float zoomStartDistance = 2;
    public float zoomSensitivity = 5;
    public float zoomSmooth = 15;
    public float zoomMin = 1.5f;
    public float zoomMax = 20;
    private float distance;
    private float currentDistance;

    void Start()
    {
         currentDistance = Mathf.Clamp(zoomStartDistance > zoomMin ? zoomMin : zoomStartDistance, zoomMin, zoomMax);
    }
    void LateUpdate()
    {
        // Smooth zoom
        currentDistance -= Input.GetAxis("Mouse ScrollWheel") * zoomSensitivity;
        currentDistance = Mathf.Clamp(currentDistance, zoomMin, zoomMax);
        distance = Mathf.Lerp(distance, currentDistance, Time.deltaTime * zoomSmooth);
    }
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