Version: 2020.3
LanguageEnglish
  • C#

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Camera.CalculateFrustumCorners

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Declaration

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

Parameters

viewport Normalized viewport coordinates to use for the frustum calculation.
z Z-depth from the camera origin at which the corners will be calculated.
eye Camera eye projection matrix to use.
outCorners Output array for the frustum corner vectors. Cannot be null and length must be >= 4.

Description

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

This 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: .