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Examples : RNG

Description

Demonstrates using physics container and compound shapes.

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This example demonstrates,

  • Using Cannon.js as the Physics engine
  • Creating a container physics objects with other objects rolling around inside.
  • Creating CANNON.Trimeshes from loaded geometries to be used a physics bodies.
  • Demonstrating the OBJLoader and traversing the loaded geometries.

Code

./src/client/client.ts

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import * as THREE from 'three'
import { OrbitControls } from 'three/examples/jsm/controls/OrbitControls'
import Stats from 'three/examples/jsm/libs/stats.module'
import { GUI } from 'dat.gui'
import * as CANNON from 'cannon-es'
import CannonUtils from './utils/cannonUtils'
import { OBJLoader } from 'three/examples/jsm/loaders/OBJLoader'
import { RGBELoader } from 'three/examples/jsm/loaders/RGBELoader'

const scene = new THREE.Scene()

new RGBELoader().load(
    './img/kloppenheim_06_puresky_1k.hdr',
    function (texture) {
        texture.mapping = THREE.EquirectangularReflectionMapping
        scene.environment = texture
    }
)

const camera = new THREE.PerspectiveCamera(
    75,
    window.innerWidth / window.innerHeight,
    0.1,
    1000
)
camera.position.set(-10, 4, 14)

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

const controls = new OrbitControls(camera, renderer.domElement)
controls.screenSpacePanning = true
controls.target.y = 5

const world = new CANNON.World()
world.gravity.set(0, -9.82, 0)

const railMaterial = new THREE.MeshPhysicalMaterial()
railMaterial.color = new THREE.Color('#ffffff')
railMaterial.roughness = 0
railMaterial.metalness = 1
railMaterial.clearcoat = 1
railMaterial.clearcoatRoughness = 1

const inverseSphereMaterial = new THREE.MeshPhysicalMaterial({
    color: 0xffffff,
    metalness: 0,
    roughness: 0.35,
    transmission: 1.0,
    clearcoat: 1.0,
    clearcoatRoughness: 0.35,
    ior: 1.05,
    thickness: 5,
})

const ballMaterial = [
    new THREE.MeshPhysicalMaterial({
        map: new THREE.TextureLoader().load('img/1-ball.jpg'),
        roughness: 0.88,
        metalness: 1.0,
        clearcoat: 0.3,
        clearcoatRoughness: 0.15,
    }),
    new THREE.MeshPhysicalMaterial({
        map: new THREE.TextureLoader().load('img/2-ball.jpg'),
        roughness: 0.88,
        metalness: 1.0,
        clearcoat: 0.3,
        clearcoatRoughness: 0.15,
    }),
    new THREE.MeshPhysicalMaterial({
        map: new THREE.TextureLoader().load('img/3-ball.jpg'),
        roughness: 0.88,
        metalness: 1.0,
        clearcoat: 0.3,
        clearcoatRoughness: 0.15,
    }),
    new THREE.MeshPhysicalMaterial({
        map: new THREE.TextureLoader().load('img/4-ball.jpg'),
        roughness: 0.88,
        metalness: 1.0,
        clearcoat: 0.3,
        clearcoatRoughness: 0.15,
    }),
    new THREE.MeshPhysicalMaterial({
        map: new THREE.TextureLoader().load('img/5-ball.jpg'),
        roughness: 0.88,
        metalness: 1.0,
        clearcoat: 0.3,
        clearcoatRoughness: 0.15,
    }),
    new THREE.MeshPhysicalMaterial({
        map: new THREE.TextureLoader().load('img/6-ball.jpg'),
        roughness: 0.88,
        metalness: 1.0,
        clearcoat: 0.3,
        clearcoatRoughness: 0.15,
    }),
    new THREE.MeshPhysicalMaterial({
        map: new THREE.TextureLoader().load('img/7-ball.jpg'),
        roughness: 0.88,
        metalness: 1.0,
        clearcoat: 0.3,
        clearcoatRoughness: 0.15,
    }),
    new THREE.MeshPhysicalMaterial({
        map: new THREE.TextureLoader().load('img/8-ball.jpg'),
        roughness: 0.88,
        metalness: 1.0,
        clearcoat: 0.3,
        clearcoatRoughness: 0.15,
    }),
    new THREE.MeshPhysicalMaterial({
        map: new THREE.TextureLoader().load('img/9-ball.jpg'),
        roughness: 0.88,
        metalness: 1.0,
        clearcoat: 0.3,
        clearcoatRoughness: 0.15,
    }),
    new THREE.MeshPhysicalMaterial({
        map: new THREE.TextureLoader().load('img/10-ball.jpg'),
        roughness: 0.88,
        metalness: 1.0,
        clearcoat: 0.3,
        clearcoatRoughness: 0.15,
    }),
]

const positions = [
    [-2, 3, 0],
    [0, 3, 0],
    [2, 3, 0],
    [0, 3, -2],
    [0, 3, 2],
    [-2, 6, 0],
    [0.5, 8, 0.5],
    [2, 6, 0],
    [0, 6, -2],
    [0, 6, 2],
]
const sphereMesh: THREE.Mesh[] = new Array()
const sphereBody: CANNON.Body[] = new Array()
for (let i = 0; i < 10; i++) {
    const sphereGeometry = new THREE.SphereGeometry(1, 16, 16)
    sphereMesh.push(new THREE.Mesh(sphereGeometry, ballMaterial[i]))
    sphereMesh[i].position.x = positions[i][0]
    sphereMesh[i].position.y = positions[i][1]
    sphereMesh[i].position.z = positions[i][2]
    scene.add(sphereMesh[i])
    const sphereShape = new CANNON.Sphere(1)
    sphereBody.push(new CANNON.Body({ mass: 1 }))
    sphereBody[i].addShape(sphereShape)
    sphereBody[i].position.x = sphereMesh[i].position.x
    sphereBody[i].position.y = sphereMesh[i].position.y
    sphereBody[i].position.z = sphereMesh[i].position.z
    world.addBody(sphereBody[i])
}

let inverseSphere: THREE.Object3D
let inverseSphereBody: CANNON.Body
let innerRail: THREE.Object3D
let outerRail: THREE.Object3D
let modelLoaded = false

const objLoader = new OBJLoader()
objLoader.load(
    'models/inverseSphere4.obj',
    (object) => {
        object.traverse(function (child) {
            if ((child as THREE.Mesh).isMesh) {
                if (child.name.startsWith('sphere')) {
                    inverseSphere = child
                    ;(inverseSphere as THREE.Mesh).material =
                        inverseSphereMaterial
                    inverseSphere.position.x = 0
                    inverseSphere.position.y = 5

                    const constraintBody = new CANNON.Body({ mass: 0 })
                    constraintBody.addShape(new CANNON.Sphere(0.01))
                    constraintBody.position.set(0, 5, 0)
                    world.addBody(constraintBody)

                    const shape = CannonUtils.CreateTrimesh(
                        (inverseSphere as THREE.Mesh).geometry
                    )
                    inverseSphereBody = new CANNON.Body({ mass: 100 })
                    inverseSphereBody.addShape(shape)
                    inverseSphereBody.position.x = inverseSphere.position.x
                    inverseSphereBody.position.y = inverseSphere.position.y
                    inverseSphereBody.position.z = inverseSphere.position.z
                    world.addBody(inverseSphereBody)

                    const c = new CANNON.PointToPointConstraint(
                        constraintBody,
                        new CANNON.Vec3(0, 0, 0),
                        inverseSphereBody,
                        new CANNON.Vec3(0, 0, 0)
                    )
                    world.addConstraint(c)
                } else if (child.name.startsWith('outerRail_')) {
                    outerRail = child
                    ;(outerRail as THREE.Mesh).material = railMaterial
                    outerRail.position.y = 5

                    const outerRailShape = CannonUtils.CreateTrimesh(
                        (outerRail as THREE.Mesh).geometry
                    )

                    const outerRailBody = new CANNON.Body({ mass: 0 })
                    outerRailBody.addShape(outerRailShape)
                    outerRailBody.position.set(0, 5, 0)
                    world.addBody(outerRailBody)
                } else if (child.name.startsWith('innerRail_')) {
                    innerRail = child
                    ;(innerRail as THREE.Mesh).material = railMaterial
                    innerRail.position.y = 5

                    const innerRailShape = CannonUtils.CreateTrimesh(
                        (innerRail as THREE.Mesh).geometry
                    )
                    inverseSphereBody.addShape(innerRailShape)
                }
            }
        })
        scene.add(inverseSphere)
        scene.add(outerRail)
        scene.add(innerRail)
        modelLoaded = true
    },
    (xhr) => {
        console.log((xhr.loaded / xhr.total) * 100 + '% loaded')
    },
    (error) => {
        console.log(error)
    }
)

const planeGeometry = new THREE.PlaneGeometry(25, 25)
const planeMesh = new THREE.Mesh(
    planeGeometry,
    new THREE.MeshStandardMaterial()
)
planeMesh.rotateX(-Math.PI / 2)
scene.add(planeMesh)

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

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

const gui = new GUI()
const physicsFolder = gui.addFolder('Physics')
physicsFolder.add(world.gravity, 'x', -10.0, 10.0, 0.1)
physicsFolder.add(world.gravity, 'y', -10.0, 10.0, 0.1)
physicsFolder.add(world.gravity, 'z', -10.0, 10.0, 0.1)
const inverseSphereMaterialFolder = gui.addFolder('InverseSphereMaterial')
inverseSphereMaterialFolder.add(inverseSphereMaterial, 'roughness', 0, 1, 0.01)
inverseSphereMaterialFolder.add(inverseSphereMaterial, 'metalness', 0, 1, 0.01)
inverseSphereMaterialFolder.add(inverseSphereMaterial, 'clearcoat', 0, 1, 0.01)
inverseSphereMaterialFolder.add(
    inverseSphereMaterial,
    'clearcoatRoughness',
    0,
    1,
    0.01
)
inverseSphereMaterialFolder.add(
    inverseSphereMaterial,
    'transmission',
    0,
    1,
    0.01
)
inverseSphereMaterialFolder.add(inverseSphereMaterial, 'ior', 1, 2.4, 0.01)
inverseSphereMaterialFolder.add(inverseSphereMaterial, 'thickness', 0, 10, 0.01)
inverseSphereMaterialFolder.open()
const railMaterialFolder = gui.addFolder('RailMaterial')
railMaterialFolder.add(railMaterial, 'roughness', 0.0, 1.0, 0.01)
railMaterialFolder.add(railMaterial, 'metalness', 0, 1, 0.01)
railMaterialFolder.add(railMaterial, 'clearcoat', 0, 1, 0.01)
railMaterialFolder.add(railMaterial, 'clearcoatRoughness', 0, 1, 0.01)

const clock = new THREE.Clock()
let delta

function animate() {
    requestAnimationFrame(animate)

    controls.update()
    delta = clock.getDelta() * 2
    if (delta > 0.1) delta = 0.1
    world.step(delta)

    for (let i = 0; i < 10; i++) {
        sphereMesh[i].position.set(
            sphereBody[i].position.x,
            sphereBody[i].position.y,
            sphereBody[i].position.z
        )
        sphereMesh[i].quaternion.set(
            sphereBody[i].quaternion.x,
            sphereBody[i].quaternion.y,
            sphereBody[i].quaternion.z,
            sphereBody[i].quaternion.w
        )
    }

    if (modelLoaded) {
        inverseSphereBody.angularVelocity.set(0, 0, -0.5)
        inverseSphere.position.set(
            inverseSphereBody.position.x,
            inverseSphereBody.position.y,
            inverseSphereBody.position.z
        )
        inverseSphere.quaternion.set(
            inverseSphereBody.quaternion.x,
            inverseSphereBody.quaternion.y,
            inverseSphereBody.quaternion.z,
            inverseSphereBody.quaternion.w
        )
        innerRail.position.set(
            inverseSphereBody.position.x,
            inverseSphereBody.position.y,
            inverseSphereBody.position.z
        )
        innerRail.quaternion.set(
            inverseSphereBody.quaternion.x,
            inverseSphereBody.quaternion.y,
            inverseSphereBody.quaternion.z,
            inverseSphereBody.quaternion.w
        )
    }

    render()

    stats.update()
}
function render() {
    renderer.render(scene, camera)
}

animate()