feat: added task4 in r3f
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@ -1,6 +1,172 @@
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export default function App() {
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import { useEffect, useMemo, useRef, useState } from 'react'
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import { Canvas, useFrame, useThree } from '@react-three/fiber'
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import * as THREE from 'three'
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const STEPS = [
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{
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label: 'Step 1: Group at rest',
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detail: 'Parent group is centered and children keep their offsets.',
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cameraPosition: [0, 1.7, 6],
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lookAt: [0, 0, 0],
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groupPosition: [0, 0, 0],
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groupRotation: [0, 0, 0],
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spinSpeed: 0,
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},
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{
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label: 'Step 2: Parent rotation',
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detail: 'Only parent rotates; children move together without changing local layout.',
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cameraPosition: [1.7, 1.8, 5.6],
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lookAt: [0, 0, 0],
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groupPosition: [0, 0, 0],
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groupRotation: [0.15, 0.55, 0],
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spinSpeed: 0.015,
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},
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{
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label: 'Step 3: Parent move + rotate',
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detail: 'Parent shifts and rotates as one unit while child spacing stays intact.',
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cameraPosition: [0.6, 2.4, 7],
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lookAt: [0.4, 0.35, 0],
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groupPosition: [0.7, 0.4, -0.4],
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groupRotation: [0.35, 1.2, 0.2],
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spinSpeed: 0.03,
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},
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]
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function GuidedGroupScene({ stepIndex }) {
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const { camera } = useThree()
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const groupRef = useRef()
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const targets = useMemo(
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() => ({
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cameraPosition: new THREE.Vector3(),
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cameraLookAt: new THREE.Vector3(),
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lookCurrent: new THREE.Vector3(),
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groupPosition: new THREE.Vector3(),
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groupRotation: new THREE.Euler(),
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spinSpeed: 0,
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initialized: false,
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}),
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[]
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)
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useEffect(() => {
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const step = STEPS[stepIndex]
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targets.cameraPosition.set(...step.cameraPosition)
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targets.cameraLookAt.set(...step.lookAt)
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targets.groupPosition.set(...step.groupPosition)
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targets.groupRotation.set(...step.groupRotation)
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targets.spinSpeed = step.spinSpeed
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if (groupRef.current && !targets.initialized) {
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camera.position.copy(targets.cameraPosition)
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targets.lookCurrent.copy(targets.cameraLookAt)
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groupRef.current.position.copy(targets.groupPosition)
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groupRef.current.rotation.copy(targets.groupRotation)
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targets.initialized = true
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}
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}, [camera, stepIndex, targets])
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useFrame(() => {
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if (!groupRef.current) return
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groupRef.current.position.lerp(targets.groupPosition, 0.1)
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groupRef.current.rotation.x += (targets.groupRotation.x - groupRef.current.rotation.x) * 0.1
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groupRef.current.rotation.y += (targets.groupRotation.y - groupRef.current.rotation.y) * 0.1
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groupRef.current.rotation.z += (targets.groupRotation.z - groupRef.current.rotation.z) * 0.1
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groupRef.current.rotation.y += targets.spinSpeed * 0.2
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camera.position.lerp(targets.cameraPosition, 0.08)
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targets.lookCurrent.lerp(targets.cameraLookAt, 0.08)
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camera.lookAt(targets.lookCurrent)
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})
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return (
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<></>
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<>
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<ambientLight intensity={0.8} />
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<directionalLight intensity={1} position={[4, 5, 4]} />
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<mesh rotation={[-Math.PI / 2, 0, 0]} position={[0, -1.2, 0]}>
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<planeGeometry args={[12, 12]} />
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<meshStandardMaterial color="#dde7f3" roughness={0.95} />
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</mesh>
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<group ref={groupRef}>
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<mesh position={[-1.1, 0, 0]}>
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<boxGeometry args={[0.9, 0.9, 0.9]} />
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<meshStandardMaterial color="#2a9d8f" />
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</mesh>
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<mesh position={[1.1, 0, 0]}>
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<sphereGeometry args={[0.55, 24, 24]} />
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<meshStandardMaterial color="#e76f51" />
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</mesh>
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<mesh position={[0, 0.95, 0]}>
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<coneGeometry args={[0.42, 0.85, 24]} />
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<meshStandardMaterial color="#457b9d" />
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</mesh>
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</group>
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</>
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)
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}
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export default function App() {
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const [stepIndex, setStepIndex] = useState(0)
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const step = STEPS[stepIndex]
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useEffect(() => {
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function onKeyDown(event) {
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if (event.key === '1') setStepIndex(0)
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if (event.key === '2') setStepIndex(1)
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if (event.key === '3') setStepIndex(2)
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}
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window.addEventListener('keydown', onKeyDown)
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return () => window.removeEventListener('keydown', onKeyDown)
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}, [])
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return (
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<div className="app-shell">
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<div id="guide">
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<h2>Task 4: Group Motion</h2>
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<p id="step-label">{step.label}</p>
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<p id="step-detail">{step.detail}</p>
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<div className="row">
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{STEPS.map((_, index) => (
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<button
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key={index}
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className={`step-btn ${stepIndex === index ? 'active' : ''}`}
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onClick={() => setStepIndex(index)}
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>
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Step {index + 1}
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</button>
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))}
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</div>
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<div className="row">
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<button onClick={() => setStepIndex((value) => Math.max(value - 1, 0))} disabled={stepIndex === 0}>
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Previous
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</button>
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<button
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onClick={() => setStepIndex((value) => Math.min(value + 1, STEPS.length - 1))}
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disabled={stepIndex === STEPS.length - 1}
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>
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Next
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</button>
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</div>
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<p id="hint">Simple parent group animation. Keys: 1, 2, 3.</p>
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</div>
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<Canvas camera={{ fov: 55, near: 0.1, far: 100, position: [0, 1.7, 6] }}>
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<color attach="background" args={['#edf3fa']} />
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<GuidedGroupScene stepIndex={stepIndex} />
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</Canvas>
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</div>
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)
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}
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@ -4,5 +4,98 @@ body,
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width: 100%;
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height: 100%;
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margin: 0;
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background-color: black;
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}
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body {
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overflow: hidden;
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background: #edf3fa;
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font-family: "Avenir Next", "Segoe UI", sans-serif;
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}
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canvas {
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display: block;
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width: 100%;
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height: 100%;
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}
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.app-shell {
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position: relative;
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width: 100%;
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height: 100%;
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}
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#guide {
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position: fixed;
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top: 14px;
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left: 14px;
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z-index: 10;
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max-width: 300px;
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background: rgba(255, 255, 255, 0.88);
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border: 1px solid rgba(0, 0, 0, 0.1);
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border-radius: 10px;
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padding: 10px;
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box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
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display: flex;
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flex-direction: column;
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gap: 8px;
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}
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#guide h2 {
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margin: 0;
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font-size: 14px;
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color: #203448;
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}
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#step-label {
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margin: 0;
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font-size: 13px;
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font-weight: 700;
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color: #1b2530;
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}
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#step-detail {
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margin: 0;
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font-size: 12px;
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color: #4f647a;
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line-height: 1.35;
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}
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.row {
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display: flex;
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gap: 6px;
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flex-wrap: wrap;
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}
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button {
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border: 1px solid #cfd8e3;
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background: #fff;
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color: #203448;
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border-radius: 8px;
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padding: 7px 9px;
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font-size: 12px;
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cursor: pointer;
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transition: all 0.2s ease;
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}
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button:hover {
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border-color: #8ea2b8;
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transform: translateY(-1px);
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}
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button.step-btn.active {
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background: #203448;
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border-color: #203448;
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color: #f4f8fb;
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}
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button:disabled {
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opacity: 0.5;
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cursor: not-allowed;
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transform: none;
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}
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#hint {
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margin: 0;
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font-size: 11px;
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color: #566f86;
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}
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