Version: 2023.1
语言: 中文

Camera.CalculateFrustumCorners

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public void CalculateFrustumCorners (Rect viewport, float z, Camera.MonoOrStereoscopicEye eye, Vector3[] outCorners);

参数

viewport 用于视锥体计算的标准化视口坐标。
z 从摄像机原点开始的 Z 深度（将在该位置计算四角）。
eye 要使用的摄像机眼投影矩阵。
outCorners 包含视锥体四角矢量的输出数组。不能为 null，且长度必须 >= 4。

描述

给定视口坐标，计算指向指定摄像机深度处视锥体四角的视图空间矢量。

The order of the corners is lower left, upper left, upper right, lower right.

CalculateFrustumCorners can be used to efficiently calculate the world space position of a pixel in an image effect shader. See standard assets implementation of global fog. 

using UnityEngine;

public class ExampleClass : MonoBehaviour
{
    void Update()
    {
        // this example shows the different camera frustums when using asymmetric projection matrices (like those used by OpenVR).

        var camera = GetComponent<Camera>();
        Vector3[] frustumCorners = new Vector3[4];
        camera.CalculateFrustumCorners(new Rect(0, 0, 1, 1), camera.farClipPlane, Camera.MonoOrStereoscopicEye.Mono, frustumCorners);

        for (int i = 0; i < 4; i++)
        {
            var worldSpaceCorner = camera.transform.TransformVector(frustumCorners[i]);
            Debug.DrawRay(camera.transform.position, worldSpaceCorner, Color.blue);
        }

        camera.CalculateFrustumCorners(new Rect(0, 0, 1, 1), camera.farClipPlane, Camera.MonoOrStereoscopicEye.Left, frustumCorners);

        for (int i = 0; i < 4; i++)
        {
            var worldSpaceCorner = camera.transform.TransformVector(frustumCorners[i]);
            Debug.DrawRay(camera.transform.position, worldSpaceCorner, Color.green);
        }

        camera.CalculateFrustumCorners(new Rect(0, 0, 1, 1), camera.farClipPlane, Camera.MonoOrStereoscopicEye.Right, frustumCorners);

        for (int i = 0; i < 4; i++)
        {
            var worldSpaceCorner = camera.transform.TransformVector(frustumCorners[i]);
            Debug.DrawRay(camera.transform.position, worldSpaceCorner, Color.red);
        }
    }
}

这些视锥体如下图所示：。

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