feat: add scene for task2 in r3f

Week-2/Task-2/r3f/sceene/src/App.jsx

@@ -1,7 +1,147 @@
 
+import { useEffect, useMemo, useRef, useState } from 'react'
+import { Canvas, useFrame } from '@react-three/fiber'
+import * as THREE from 'three'
+
+const SCENE_STATES = {
+  state1: {
+    center: { position: [0, 0, 0], rotation: [0, 0, 0], visible: true },
+    left: { position: [0, 0, 0], rotation: [0, 0, 0], visible: false },
+    right: { position: [0, 0, 0], rotation: [0, 0, 0], visible: false },
+  },
+  state2: {
+    center: { position: [0, 0, 0], rotation: [0.25, 0.4, 0], visible: true },
+    left: { position: [-2.1, 0, 0.2], rotation: [0, 0.2, 0], visible: true },
+    right: { position: [2.1, 0, -0.2], rotation: [0, -0.2, 0], visible: true },
+  },
+  state3: {
+    center: { position: [0, 1.3, 0], rotation: [0.6, 0.9, 0], visible: true },
+    left: { position: [-1.2, -1, 1.2], rotation: [0.3, 0.3, 0.1], visible: true },
+    right: { position: [0, 0, 0], rotation: [0, 0, 0], visible: false },
+  },
+}
+
+function SceneObjects({ stateKey }) {
+  const centerRef = useRef()
+  const leftRef = useRef()
+  const rightRef = useRef()
+
+  const targets = useMemo(
+    () => ({
+      center: { position: new THREE.Vector3(), rotation: new THREE.Euler() },
+      left: { position: new THREE.Vector3(), rotation: new THREE.Euler() },
+      right: { position: new THREE.Vector3(), rotation: new THREE.Euler() },
+    }),
+    []
+  )
+
+  useEffect(() => {
+    const state = SCENE_STATES[stateKey]
+    const refs = {
+      center: centerRef.current,
+      left: leftRef.current,
+      right: rightRef.current,
+    }
+
+    Object.keys(refs).forEach((name) => {
+      const object = refs[name]
+      if (!object) return
+
+      const config = state[name]
+      targets[name].position.set(...config.position)
+      targets[name].rotation.set(...config.rotation)
+      object.visible = config.visible
+    })
+  }, [stateKey, targets])
+
+  useFrame(() => {
+    const refs = {
+      center: centerRef.current,
+      left: leftRef.current,
+      right: rightRef.current,
+    }
+
+    Object.keys(refs).forEach((name) => {
+      const object = refs[name]
+      if (!object) return
+
+      const target = targets[name]
+      object.position.lerp(target.position, 0.1)
+      object.rotation.x += (target.rotation.x - object.rotation.x) * 0.1
+      object.rotation.y += (target.rotation.y - object.rotation.y) * 0.1
+      object.rotation.z += (target.rotation.z - object.rotation.z) * 0.1
+    })
+  })
+
+  return (
+    <>
+      <ambientLight intensity={0.9} />
+      <directionalLight intensity={1} position={[3, 4, 5]} />
+
+      <mesh ref={centerRef}>
+        <boxGeometry args={[1.2, 1.2, 1.2]} />
+        <meshStandardMaterial color="#2a9d8f" />
+      </mesh>
+
+      <mesh ref={leftRef}>
+        <boxGeometry args={[0.9, 0.9, 0.9]} />
+        <meshStandardMaterial color="#e76f51" />
+      </mesh>
+
+      <mesh ref={rightRef}>
+        <boxGeometry args={[0.9, 0.9, 0.9]} />
+        <meshStandardMaterial color="#457b9d" />
+      </mesh>
+    </>
+  )
+}
+
 function App() {
+  const [stateKey, setStateKey] = useState('state1')
+
+  useEffect(() => {
+    function onKeyDown(event) {
+      if (event.key === '1') setStateKey('state1')
+      if (event.key === '2') setStateKey('state2')
+      if (event.key === '3') setStateKey('state3')
+    }
+
+    window.addEventListener('keydown', onKeyDown)
+    return () => window.removeEventListener('keydown', onKeyDown)
+  }, [])
+
   return (
-    <></>
+    <div className="app-shell">
+      <div id="state-panel">
+        <h2>Scene States</h2>
+        <div className="state-buttons">
+          <button
+            className={`state-btn ${stateKey === 'state1' ? 'active' : ''}`}
+            onClick={() => setStateKey('state1')}
+          >
+            State 1 (1)
+          </button>
+          <button
+            className={`state-btn ${stateKey === 'state2' ? 'active' : ''}`}
+            onClick={() => setStateKey('state2')}
+          >
+            State 2 (2)
+          </button>
+          <button
+            className={`state-btn ${stateKey === 'state3' ? 'active' : ''}`}
+            onClick={() => setStateKey('state3')}
+          >
+            State 3 (3)
+          </button>
+        </div>
+        <p id="hint">Press 1, 2, or 3 to switch state.</p>
+      </div>
+
+      <Canvas camera={{ fov: 55, near: 0.1, far: 100, position: [0, 2, 7] }}>
+        <color attach="background" args={["#f3f5f8"]} />
+        <SceneObjects stateKey={stateKey} />
+      </Canvas>
+    </div>
   )
 }
 

Week-2/Task-2/r3f/sceene/src/index.css

@@ -8,8 +8,74 @@ body,
 
 body {
   overflow: hidden;
+  font-family: "Avenir Next", "Segoe UI", sans-serif;
+  background: #f3f5f8;
 }
 
 canvas {
   display: block;
 }
+
+.app-shell {
+  position: relative;
+  width: 100%;
+  height: 100%;
+}
+
+#state-panel {
+  position: fixed;
+  top: 16px;
+  left: 16px;
+  z-index: 10;
+  background: rgba(255, 255, 255, 0.82);
+  border: 1px solid rgba(0, 0, 0, 0.12);
+  border-radius: 12px;
+  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
+  padding: 12px;
+  display: flex;
+  flex-direction: column;
+  gap: 8px;
+  backdrop-filter: blur(6px);
+}
+
+#state-panel h2 {
+  margin: 0;
+  font-size: 14px;
+  letter-spacing: 0.03em;
+  color: #1b2530;
+  font-weight: 700;
+}
+
+.state-buttons {
+  display: flex;
+  gap: 8px;
+  flex-wrap: wrap;
+}
+
+.state-btn {
+  border: 1px solid #cfd8e3;
+  background: #ffffff;
+  color: #203448;
+  border-radius: 8px;
+  padding: 8px 10px;
+  font-size: 13px;
+  cursor: pointer;
+  transition: all 0.2s ease;
+}
+
+.state-btn:hover {
+  border-color: #8ea2b8;
+  transform: translateY(-1px);
+}
+
+.state-btn.active {
+  background: #203448;
+  border-color: #203448;
+  color: #f4f8fb;
+}
+
+#hint {
+  margin: 0;
+  font-size: 12px;
+  color: #4f647a;
+}