Camera.fieldOfView

# [Camera](https://docs.unity3d.com/cn/2019.4/ScriptReference/Camera.html).fieldOfView

public float **fieldOfView** ;

## 描述

摄像机的视野（以度为单位）。

这是垂直视野；水平 视野随视口宽高比的变化而改变，有关更多信息，请参阅 [VerticalToHorizontalFieldOfView](https://docs.unity3d.com/cn/2019.4/ScriptReference/Camera.VerticalToHorizontalFieldOfView.html)。 如果是正交摄像机，则忽略视野（请参阅 [orthographic](https://docs.unity3d.com/cn/2019.4/ScriptReference/Camera-orthographic.html)）。

某些 VR SDK 具有用于 VR 摄像机的固定视野值。使用这些 SDK 启用 VR 时，该属性将始终返回来自 SDK 的值。如果您尝试设置该属性，则会在记录中看到一条警告，并且该值会被忽略。

如果对 [projectionMatrix](https://docs.unity3d.com/cn/2019.4/ScriptReference/Camera-projectionMatrix.html) 进行更改，摄像机将不再根据其 [fieldOfView](https://docs.unity3d.com/cn/2019.4/ScriptReference/Camera-fieldOfView.html) 更新渲染。在调用 [ResetProjectionMatrix](https://docs.unity3d.com/cn/2019.4/ScriptReference/Camera.ResetProjectionMatrix.html) 之前，该设置持续有效。

另请参阅：[camera component](https://docs.unity3d.com/cn/2019.4/Manual/class-Camera.html)。

```
//Attach this script to an empty GameObject.
//This script creates a Slider that allows you to manipulate the Camera's field of view. Place GameObjects in the Scene to show the full effect.

using UnityEngine;

public class CameraFieldOfViewExample : MonoBehaviour
{
    //This is the field of view that the Camera has
    float m_FieldOfView;

void Start()
    {
        //Start the Camera field of view at 60
        m_FieldOfView = 60.0f;
    }

void Update()
    {
        //Update the camera's field of view to be the variable returning from the Slider
        Camera.main.fieldOfView = m_FieldOfView;
    }

void OnGUI()
    {
        //Set up the maximum and minimum values the Slider can return (you can change these)
        float max, min;
        max = 150.0f;
        min = 20.0f;
        //This Slider changes the field of view of the Camera between the minimum and maximum values
        m_FieldOfView = GUI.HorizontalSlider(new Rect(20, 20, 100, 40), m_FieldOfView, min, max);
    }
}
```