Smooth camera size interpolation

Question

I am trying to interpolate the camera size with this code:

 // t counts between 0 and 1
 cam.orthographicSize = Mathf.SmoothStep(cam.orthogaphicSize, CAMERA_DEFAULT_ZOOM * ZoomFactor, t);

The issue is that this does not produce a smooth result. I think that is because I update orthographicSize and use it as the starting point for each iteration.

What is the proper way of interpolating with a moving start value ?

One option i thought of was to keep track of the orthographicSize at the moment of starting the interpolation. I am not sure that is the best approach.

Answer 1

Best Answer

Answer by Thom Denick · Dec 28, 2014 at 11:19 PM

I think you already figured this out. When interpolating, you don't want to use the updated cam.orthographicSize with SmoothStep, you need to store a copy of the starting orthographicSize and use that for your first variable. "t" will determine where the camera is at this frame.

 using UnityEngine;
 using System.Collections;
 
 public class SmoothCameraSize : MonoBehaviour 
 {
 public Camera interpolateCam;

 private float startingSize;
 private float endSize;
 private float t = 0;

 private void Awake()
 {
     startingSize = interpolateCam.orthographicSize;
     endSize = startingSize * 2;
 }

 private void Update()
 {
     t += Time.deltaTime;
     interpolateCam.orthographicSize = Mathf.SmoothStep(startingSize, endSize, t);
 }

}

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Smooth camera size interpolation

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