Camera.CalculateFrustumCorners

パラメーター

説明

Given viewport coordinates, calculates the view space vectors pointing to the four frustum corners at the specified camera depth.

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);
        }
    }
}

Which can be seen in the following image: .