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Lerp Material Properties

Description

Animating material properties is possible. In this example, if you hover over the polygons, then the color, plus several other material properties are lerped to new settings.

You can also click the polygon, and the scale will either increase or decrease depending on how it was left before the last click.

If you preferred to use tween, then I also have a tweening version.

Example Script

./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'

function lerp(x: number, y: number, a: number): number {
    const r = (1 - a) * x + a * y
    return r < 0.001 ? 0 : r
}

class pickable extends THREE.Mesh {
    hovered = false
    clicked = false
    originalColor: THREE.Color
    colorTo = new THREE.Color(0xff2244)

    constructor(geometry: THREE.BufferGeometry, material: THREE.Material) {
        super()
        this.geometry = geometry
        this.material = material
        this.originalColor = (
            material as THREE.MeshPhysicalMaterial
        ).color.clone()
        this.castShadow = true
    }

    update(delta: number): void {
        this.rotation.x += delta
        this.rotation.y += delta
        const m = this.material as THREE.MeshPhysicalMaterial
        this.hovered
            ? (m.color.lerp(this.colorTo, 0.1),
              (m.thickness = lerp(m.thickness, 3, 0.1)),
              (m.reflectivity = lerp(m.reflectivity, 1, 0.1)),
              (m.roughness = lerp(m.roughness, 0.1, 0.1)),
              (m.clearcoat = lerp(m.clearcoat, 0.1, 0.1)),
              (m.transmission = lerp(m.transmission, 0.99, 0.1)),
              (m.ior = lerp(m.ior, 1.1, 0.1)))
            : (m.color.lerp(this.originalColor, 0.1),
              (m.thickness = lerp(m.thickness, 0, 0.1)),
              (m.reflectivity = lerp(m.reflectivity, 0, 0.1)),
              (m.roughness = lerp(m.roughness, 1.0, 0.1)),
              (m.clearcoat = lerp(m.clearcoat, 0, 0.1)),
              (m.transmission = lerp(m.transmission, 0, 0.1)),
              (m.ior = lerp(m.ior, 1.5, 0.1)))
        this.clicked
            ? this.scale.set(
                  lerp(this.scale.x, 1.5, 0.1),
                  lerp(this.scale.y, 1.5, 0.1),
                  lerp(this.scale.z, 1.5, 0.1)
              )
            : this.scale.set(
                  lerp(this.scale.x, 1.0, 0.1),
                  lerp(this.scale.y, 1.0, 0.1),
                  lerp(this.scale.z, 1.0, 0.1)
              )
    }
}

const raycaster = new THREE.Raycaster()
const pickables: pickable[] = []
let intersects: THREE.Intersection[]

const scene = new THREE.Scene()

const spotLight = new THREE.SpotLight(0xffffff, 500)
spotLight.position.set(5, 5, 5)
spotLight.angle = 0.3
spotLight.penumbra = 0.5
spotLight.castShadow = true
spotLight.shadow.mapSize.width = 512
spotLight.shadow.mapSize.height = 512
spotLight.shadow.bias = -0.001
spotLight.shadow.radius = 20
spotLight.shadow.blurSamples = 10
spotLight.shadow.camera.far = 15
scene.add(spotLight)

const camera = new THREE.PerspectiveCamera(
    75,
    window.innerWidth / window.innerHeight,
    0.1,
    100
)
camera.position.y = 2
camera.position.z = 4

const renderer = new THREE.WebGLRenderer({ antialias: true })
renderer.setSize(window.innerWidth, window.innerHeight)
renderer.shadowMap.enabled = true
renderer.shadowMap.type = THREE.VSMShadowMap
renderer.domElement.addEventListener('pointerdown', onClick, false)

document.body.appendChild(renderer.domElement)
document.addEventListener('mousemove', onDocumentMouseMove, false)

const controls = new OrbitControls(camera, renderer.domElement)
controls.enableDamping = true

const envTexture = new THREE.CubeTextureLoader().load([
    'img/px_25.jpg',
    'img/nx_25.jpg',
    'img/py_25.jpg',
    'img/ny_25.jpg',
    'img/pz_25.jpg',
    'img/nz_25.jpg',
])
envTexture.mapping = THREE.CubeReflectionMapping
scene.environment = envTexture

const cube = new pickable(
    new THREE.BoxGeometry(),
    new THREE.MeshPhysicalMaterial({ color: 0xff8800 })
)
cube.position.set(-2, 0, 0)
scene.add(cube)
pickables.push(cube)

const cylinder = new pickable(
    new THREE.CylinderGeometry(0.66, 0.66),
    new THREE.MeshPhysicalMaterial({ color: 0x008800 })
)
scene.add(cylinder)
pickables.push(cylinder)

const pyramid = new pickable(
    new THREE.TetrahedronGeometry(),
    new THREE.MeshPhysicalMaterial({ color: 0x0088ff })
)
pyramid.position.set(2, 0, 0)
scene.add(pyramid)
pickables.push(pyramid)

const floor = new THREE.Mesh(
    new THREE.PlaneGeometry(10, 10),
    new THREE.MeshPhysicalMaterial()
)
floor.rotateX(-Math.PI / 2)
floor.position.y = -1.25
floor.receiveShadow = true
scene.add(floor)

function onDocumentMouseMove(event: MouseEvent) {
    raycaster.setFromCamera(
        {
            x: (event.clientX / renderer.domElement.clientWidth) * 2 - 1,
            y: -(event.clientY / renderer.domElement.clientHeight) * 2 + 1,
        },
        camera
    )
    pickables.forEach((p) => (p.hovered = false))
    intersects = raycaster.intersectObjects(pickables, false)
    if (intersects) (intersects[0].object as pickable).hovered = true
}

function onClick(event: MouseEvent) {
    raycaster.setFromCamera(
        {
            x: (event.clientX / renderer.domElement.clientWidth) * 2 - 1,
            y: -(event.clientY / renderer.domElement.clientHeight) * 2 + 1,
        },
        camera
    )
    intersects = raycaster.intersectObjects(pickables, false)
    intersects.forEach((i) => {
        ;(i.object as pickable).clicked = !(i.object as pickable).clicked
    })
}

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

const clock = new THREE.Clock()
let delta = 0

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

function animate() {
    requestAnimationFrame(animate)

    controls.update()

    delta = clock.getDelta()
    pickables.forEach((p) => {
        p.update(delta)
    })

    render()

    stats.update()
}

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

animate()