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A script to fix the horizontal FOV/orthographic size of a camera to a specified value in Unity
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using UnityEngine; | |
[ExecuteInEditMode] | |
[RequireComponent( typeof( Camera ) )] | |
public class HorizontalCamera : MonoBehaviour | |
{ | |
private Camera m_camera; | |
private float lastAspect; | |
#pragma warning disable 0649 | |
[SerializeField] | |
private float m_fieldOfView = 60f; | |
public float FieldOfView | |
{ | |
get { return m_fieldOfView; } | |
set | |
{ | |
if( m_fieldOfView != value ) | |
{ | |
m_fieldOfView = value; | |
RefreshCamera(); | |
} | |
} | |
} | |
[SerializeField] | |
private float m_orthographicSize = 5f; | |
public float OrthographicSize | |
{ | |
get { return m_orthographicSize; } | |
set | |
{ | |
if( m_orthographicSize != value ) | |
{ | |
m_orthographicSize = value; | |
RefreshCamera(); | |
} | |
} | |
} | |
#pragma warning restore 0649 | |
private void OnEnable() | |
{ | |
RefreshCamera(); | |
#if UNITY_EDITOR | |
UnityEditor.EditorApplication.update -= Update; | |
UnityEditor.EditorApplication.update += Update; | |
#endif | |
} | |
private void Update() | |
{ | |
float aspect = m_camera.aspect; | |
if( aspect != lastAspect ) | |
AdjustCamera( aspect ); | |
} | |
public void RefreshCamera() | |
{ | |
if( !m_camera ) | |
m_camera = GetComponent<Camera>(); | |
AdjustCamera( m_camera.aspect ); | |
} | |
private void AdjustCamera( float aspect ) | |
{ | |
lastAspect = aspect; | |
// Credit: https://forum.unity.com/threads/how-to-calculate-horizontal-field-of-view.16114/#post-2961964 | |
float _1OverAspect = 1f / aspect; | |
m_camera.fieldOfView = 2f * Mathf.Atan( Mathf.Tan( m_fieldOfView * Mathf.Deg2Rad * 0.5f ) * _1OverAspect ) * Mathf.Rad2Deg; | |
m_camera.orthographicSize = m_orthographicSize * _1OverAspect; | |
} | |
#if UNITY_EDITOR | |
private void OnValidate() | |
{ | |
RefreshCamera(); | |
} | |
private void OnDisable() | |
{ | |
UnityEditor.EditorApplication.update -= Update; | |
} | |
#endif | |
} |
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