How to get Frustrum camera plane

AlexGoryushkin · June 14, 2021, 6:14pm

Hello everyone!
Is it possible to get the coordinates of the Frustrum near camera plane points? Perhaps these coordinates are already contained in the camera object?
My goal is to highlight this near camera plane with a thick line along the edges and display this square on another camera. More precisely, I need to display the field of view of one camera (the square of the screen) on another camera
I also wanted to ask, is it possible to dynamically resize a square (LineSegments) created from 4 points? By changing the coordinates of these points, not by scale vector

Oxyn · June 15, 2021, 10:47am

You mean like the camera helper example?
https://threejs.org/examples/#webgl_camera

The main code of the camera helpers can be found here, if you need more details.
You can probably access these without rewriting them. This code is included inside main build.

github.com

mrdoob/three.js/blob/d39d82999f0ac5cdd1b4eb9f4aba3f9626f32ab6/src/helpers/CameraHelper.js

import { Camera } from '../cameras/Camera.js';
import { Vector3 } from '../math/Vector3.js';
import { LineSegments } from '../objects/LineSegments.js';
import { Color } from '../math/Color.js';
import { LineBasicMaterial } from '../materials/LineBasicMaterial.js';
import { BufferGeometry } from '../core/BufferGeometry.js';
import { Float32BufferAttribute } from '../core/BufferAttribute.js';

const _vector = /*@__PURE__*/ new Vector3();
const _camera = /*@__PURE__*/ new Camera();

/**
 *	- shows frustum, line of sight and up of the camera
 *	- suitable for fast updates
 * 	- based on frustum visualization in lightgl.js shadowmap example
 *		http://evanw.github.com/lightgl.js/tests/shadowmap.html
 */

class CameraHelper extends LineSegments {

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How to get Frustrum camera plane

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