164 lines
5.1 KiB
JavaScript
164 lines
5.1 KiB
JavaScript
import * as THREE from 'three'
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const scene = new THREE.Scene()
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scene.background = new THREE.Color(0xeaf0f7)
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const camera = new THREE.PerspectiveCamera(55, window.innerWidth / window.innerHeight, 0.1, 100)
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const renderer = new THREE.WebGLRenderer({ antialias: true })
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renderer.setPixelRatio(Math.min(window.devicePixelRatio, 2))
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renderer.setSize(window.innerWidth, window.innerHeight)
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document.body.appendChild(renderer.domElement)
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scene.add(new THREE.AmbientLight(0xffffff, 0.8))
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const dirLight = new THREE.DirectionalLight(0xffffff, 1)
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dirLight.position.set(3, 4, 5)
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scene.add(dirLight)
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const floor = new THREE.Mesh(
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new THREE.PlaneGeometry(12, 12),
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new THREE.MeshStandardMaterial({ color: 0xdbe6f3, roughness: 0.95 })
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)
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floor.rotation.x = -Math.PI / 2
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floor.position.y = -0.8
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scene.add(floor)
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const objectA = new THREE.Mesh(
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new THREE.BoxGeometry(1.2, 1.2, 1.2),
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new THREE.MeshStandardMaterial({ color: 0x2a9d8f })
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)
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const objectB = new THREE.Mesh(
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new THREE.SphereGeometry(0.7, 32, 32),
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new THREE.MeshStandardMaterial({ color: 0xe76f51 })
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)
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scene.add(objectA, objectB)
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const STEPS = [
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{
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label: 'Step 1: Focus on object A',
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detail: 'Camera frames object A only.',
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cameraPosition: [0, 1.4, 5],
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lookAt: [-1.2, 0, 0],
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a: { position: [-1.2, 0, 0], rotation: [0, 0.25, 0], visible: true },
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b: { position: [1.4, 0, 0], rotation: [0, 0, 0], visible: false },
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},
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{
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label: 'Step 2: Move camera + reveal object B',
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detail: 'Camera shifts right and object B becomes visible.',
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cameraPosition: [2.2, 1.4, 5],
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lookAt: [1.4, 0, 0],
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a: { position: [-1.2, 0, 0], rotation: [0.2, 0.8, 0], visible: true },
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b: { position: [1.4, 0, 0], rotation: [0, 0.2, 0], visible: true },
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},
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{
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label: 'Step 3: Final combined scene',
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detail: 'Both objects stay visible in one balanced view.',
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cameraPosition: [0.3, 2.2, 7],
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lookAt: [0, 0, 0],
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a: { position: [-1.5, 0, 0], rotation: [0.3, 1.1, 0], visible: true },
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b: { position: [1.5, 0, 0], rotation: [0.1, 0.6, 0], visible: true },
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},
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]
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const targets = {
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cameraPosition: new THREE.Vector3(),
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cameraLookAt: new THREE.Vector3(),
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aPosition: new THREE.Vector3(),
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aRotation: new THREE.Euler(),
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bPosition: new THREE.Vector3(),
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bRotation: new THREE.Euler(),
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}
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let currentStep = 0
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let initialized = false
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const lookCurrent = new THREE.Vector3()
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const stepLabel = document.getElementById('step-label')
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const stepDetail = document.getElementById('step-detail')
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const stepButtons = Array.from(document.querySelectorAll('.step-btn'))
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const prevButton = document.getElementById('prev-btn')
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const nextButton = document.getElementById('next-btn')
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function applyStep(index) {
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currentStep = THREE.MathUtils.clamp(index, 0, STEPS.length - 1)
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const step = STEPS[currentStep]
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targets.cameraPosition.set(...step.cameraPosition)
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targets.cameraLookAt.set(...step.lookAt)
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targets.aPosition.set(...step.a.position)
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targets.aRotation.set(...step.a.rotation)
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objectA.visible = step.a.visible
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targets.bPosition.set(...step.b.position)
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targets.bRotation.set(...step.b.rotation)
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objectB.visible = step.b.visible
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if (!initialized) {
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camera.position.copy(targets.cameraPosition)
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lookCurrent.copy(targets.cameraLookAt)
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objectA.position.copy(targets.aPosition)
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objectA.rotation.copy(targets.aRotation)
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objectB.position.copy(targets.bPosition)
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objectB.rotation.copy(targets.bRotation)
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initialized = true
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}
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stepLabel.textContent = step.label
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stepDetail.textContent = step.detail
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stepButtons.forEach((button, buttonIndex) => {
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button.classList.toggle('active', buttonIndex === currentStep)
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})
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prevButton.disabled = currentStep === 0
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nextButton.disabled = currentStep === STEPS.length - 1
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}
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stepButtons.forEach((button) => {
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button.addEventListener('click', () => applyStep(Number(button.dataset.step)))
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})
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prevButton.addEventListener('click', () => applyStep(currentStep - 1))
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nextButton.addEventListener('click', () => applyStep(currentStep + 1))
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window.addEventListener('keydown', (event) => {
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if (event.key === '1') applyStep(0)
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if (event.key === '2') applyStep(1)
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if (event.key === '3') applyStep(2)
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if (event.key === 'ArrowLeft') applyStep(currentStep - 1)
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if (event.key === 'ArrowRight') applyStep(currentStep + 1)
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})
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applyStep(0)
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function animate() {
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objectA.position.lerp(targets.aPosition, 0.1)
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objectB.position.lerp(targets.bPosition, 0.1)
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objectA.rotation.x += (targets.aRotation.x - objectA.rotation.x) * 0.1
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objectA.rotation.y += (targets.aRotation.y - objectA.rotation.y) * 0.1
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objectA.rotation.z += (targets.aRotation.z - objectA.rotation.z) * 0.1
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objectB.rotation.x += (targets.bRotation.x - objectB.rotation.x) * 0.1
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objectB.rotation.y += (targets.bRotation.y - objectB.rotation.y) * 0.1
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objectB.rotation.z += (targets.bRotation.z - objectB.rotation.z) * 0.1
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camera.position.lerp(targets.cameraPosition, 0.08)
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lookCurrent.lerp(targets.cameraLookAt, 0.08)
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camera.lookAt(lookCurrent)
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renderer.render(scene, camera)
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}
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renderer.setAnimationLoop(animate)
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window.addEventListener('resize', () => {
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camera.aspect = window.innerWidth / window.innerHeight
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camera.updateProjectionMatrix()
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renderer.setSize(window.innerWidth, window.innerHeight)
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})
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