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coastwise/VertMinusCameraFOV.cs

Created July 8, 2013 20:16
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  1. coastwise created this gist Jul 8, 2013.
    52 changes: 52 additions & 0 deletions VertMinusCameraFOV.cs
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    using UnityEngine;
    using System.Collections;

    /**
    * This class attempts to force VERT- Field of view scaling.
    * By default, Unity uses the HOR+ technique.
    *
    * http://en.wikipedia.org/wiki/Field_of_view_in_video_games#Scaling_methods
    */

    [ExecuteInEditMode]
    [RequireComponent (typeof(Camera))]
    public class VertMinusCameraFOV : MonoBehaviour {

    public float designTimeVerticalFieldOfView = 60;
    public int designTimeWidth = 1280;
    public int designTimeHeight = 720;

    private float hFOVInRads;

    private int prevWidth;
    private int prevHeight;

    void Start () {

    prevWidth = designTimeWidth;
    prevHeight = designTimeHeight;

    float aspectRatio = (float) designTimeWidth / (float) designTimeHeight;
    float vFOVInRads = designTimeVerticalFieldOfView * Mathf.Deg2Rad;
    hFOVInRads = 2f * Mathf.Atan( Mathf.Tan(vFOVInRads/2f) * aspectRatio);

    }

    void Update () {

    if (Screen.width != prevWidth || Screen.height != prevHeight) {

    float aspectRatio = (float) Screen.width / (float) Screen.height;

    float vFOVInRads = 2f * Mathf.Atan( Mathf.Tan(hFOVInRads/2f) / aspectRatio );

    Debug.Log("Screen resolution change. Recomputing aspect ratio (" + aspectRatio + ") and field of view (" + vFOVInRads*Mathf.Rad2Deg + ")");

    foreach (Camera cam in GameObject.FindObjectsOfType(typeof(Camera))) {
    cam.fieldOfView = vFOVInRads * Mathf.Rad2Deg;
    }
    }

    }

    }