Camera.CalculateFrustumCorners

参数

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。

用于有效地计算图像特效着色器中的像素在世界空间中的位置。请参阅全局雾效的标准资源实现。

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：。