CubeCamera Reflections

Description

The CubeCamera object, can be used to create more realistic reflections on volumetric objects such as spheres, cubes and other objects.

The steps to use the THREE.CubeCamera,

Create a THREE.WebGLCubeRenderTarget
Create a THREE.CubeCamera
Create a Material that uses the CubeRenderTargets Texture
Create a Mesh
Add the Material to the Mesh
Add the CubeCamera to the Mesh so that its position always reflects the correct mesh it is projecting from.
Add the Mesh to the Scene
In the Render loop, update the CubeCamera. Hide its parent mesh, in case the parent mesh gets picked up in its own render pass.

Code

./src/server/server.ts

import express from "express"
import path from "path"
import http from "http"

const port: number = 3000

class App {
    private server: http.Server
    private port: number

    constructor(port: number) {
        this.port = port
        const app = express()
        app.use(express.static(path.join(__dirname, '../client')))
        app.use('/build/three.module.js', express.static(path.join(__dirname, '../../node_modules/three/build/three.module.js')))
        app.use('/jsm/controls/OrbitControls', express.static(path.join(__dirname, '../../node_modules/three/examples/jsm/controls/OrbitControls.js')))
        app.use('/jsm/libs/stats.module', express.static(path.join(__dirname, '../../node_modules/three/examples/jsm/libs/stats.module.js')))

        this.server = new http.Server(app);
    }

    public Start() {
        this.server.listen(this.port, () => {
            console.log( `Server listening on port ${this.port}.` )
        })
    }
}

new App(port).Start()

./src/client/client.ts

import * as THREE from '/build/three.module.js'
import { OrbitControls } from '/jsm/controls/OrbitControls'
import Stats from '/jsm/libs/stats.module'

const scene: THREE.Scene = new THREE.Scene()
scene.background = new THREE.Color(0x87ceeb)

const ambientLight = new THREE.AmbientLight(0xaaaaaa);
scene.add(ambientLight);

const light1 = new THREE.PointLight();
light1.position.set(10, 10, 10)
light1.castShadow = true
light1.shadow.bias = -0.0002
light1.shadow.mapSize.height = 1024
light1.shadow.mapSize.width = 1024
scene.add(light1);

const camera: THREE.PerspectiveCamera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 0.01, 100)
camera.position.set(1.75, 1.75, 3.5)

const renderer: THREE.WebGLRenderer = new THREE.WebGLRenderer()
renderer.setSize(window.innerWidth, window.innerHeight)
renderer.shadowMap.enabled = true
document.body.appendChild(renderer.domElement)

const orbitControls = new OrbitControls(camera, renderer.domElement)
orbitControls.dampingFactor = .1
orbitControls.enableDamping = true

const planeGeometry: THREE.PlaneGeometry = new THREE.PlaneGeometry(25, 25)
const texture = new THREE.TextureLoader().load("img/grid.png")
const plane: THREE.Mesh = new THREE.Mesh(planeGeometry, new THREE.MeshPhongMaterial({ map: texture }))
plane.rotateX(-Math.PI / 2)
plane.receiveShadow = true
scene.add(plane)

window.addEventListener('resize', onWindowResize, false)
function onWindowResize() {
    camera.aspect = window.innerWidth / window.innerHeight
    camera.updateProjectionMatrix()
    renderer.setSize(window.innerWidth, window.innerHeight)
    render()
}

const cubeRenderTarget1: THREE.WebGLCubeRenderTarget = new THREE.WebGLCubeRenderTarget(128, { format: THREE.RGBFormat, generateMipmaps: true, minFilter: THREE.LinearMipmapLinearFilter });
const cubeRenderTarget2: THREE.WebGLCubeRenderTarget = new THREE.WebGLCubeRenderTarget(128, { format: THREE.RGBFormat, generateMipmaps: true, minFilter: THREE.LinearMipmapLinearFilter });
const cubeRenderTarget3: THREE.WebGLCubeRenderTarget = new THREE.WebGLCubeRenderTarget(128, { format: THREE.RGBFormat, generateMipmaps: true, minFilter: THREE.LinearMipmapLinearFilter });
const cubeCamera1: THREE.CubeCamera = new THREE.CubeCamera(.1, 1000, cubeRenderTarget1);
const cubeCamera2: THREE.CubeCamera = new THREE.CubeCamera(.1, 1000, cubeRenderTarget2);
const cubeCamera3: THREE.CubeCamera = new THREE.CubeCamera(.1, 1000, cubeRenderTarget3);

const pivot1 = new THREE.Object3D();
scene.add(pivot1);
const pivot2 = new THREE.Object3D();
scene.add(pivot2);
const pivot3 = new THREE.Object3D();
scene.add(pivot3);

const material1 = new THREE.MeshPhongMaterial({
    shininess: 100,
    color: 0xffffff,
    specular: 0xffaa00,
    reflectivity: 0.9,
    envMap: cubeRenderTarget1.texture
});
const material2 = new THREE.MeshPhongMaterial({
    shininess: 100,
    color: 0xffffff,
    reflectivity: 0.9,
    specular: 0xffaa00,
    envMap: cubeRenderTarget2.texture
});
const material3 = new THREE.MeshPhongMaterial({
    shininess: 100,
    color: 0xffffff,
    specular: 0xffaa00,
    reflectivity: 0.9,
    envMap: cubeRenderTarget3.texture
});

const ball1 = new THREE.Mesh(new THREE.SphereGeometry(1, 32, 32), material1);
ball1.position.set(1, 1.1, 0);
ball1.castShadow = true;
ball1.receiveShadow = true;
ball1.add(cubeCamera1);
pivot1.add(ball1);

const ball2 = new THREE.Mesh(new THREE.SphereGeometry(1, 32, 32), material2);
ball2.position.set(3.1, 1.1, 0);
ball2.castShadow = true;
ball2.receiveShadow = true;
ball2.add(cubeCamera2);
pivot2.add(ball2);

const ball3 = new THREE.Mesh(new THREE.SphereGeometry(1, 32, 32), material3);
ball3.position.set(5.2, 1.1, 0);
ball3.castShadow = true;
ball3.receiveShadow = true;
ball3.add(cubeCamera3);
pivot3.add(ball3);




const stats = Stats()
document.body.appendChild(stats.dom)

const clock: THREE.Clock = new THREE.Clock()

var animate = function () {
    requestAnimationFrame(animate)

    const delta = clock.getDelta();
    ball1.rotateY(-0.2 * delta);
    pivot1.rotateY(0.2 * delta);
    ball2.rotateY(-0.3 * delta);
    pivot2.rotateY(0.3 * delta);
    ball3.rotateY(-0.4 * delta);
    pivot3.rotateY(0.4 * delta);

    orbitControls.update()

    render()

    stats.update()
};

function render() {
    ball1.visible = false
    cubeCamera1.update(renderer, scene);
    ball1.visible = true
    ball2.visible = false
    cubeCamera2.update(renderer, scene);
    ball2.visible = true
    ball3.visible = false
    cubeCamera3.update(renderer, scene);
    ball3.visible = true

    renderer.render(scene, camera)
}
animate();

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