다이렉트 터치

import * as THREE from 'three';
const renderer = new THREE.WebGLRenderer({ antialias: true });
renderer.setPixelRatio(Math.min(devicePixelRatio, 2));
document.body.appendChild(renderer.domElement);
const scene = new THREE.Scene();
const camera = new THREE.PerspectiveCamera(48, 1, 0.1, 20);
camera.position.set(0, 0.2, 4.4);
camera.lookAt(0, 0, 0);
scene.add(new THREE.HemisphereLight(0xbcd0ff, 0x101018, 1.5));
const key = new THREE.DirectionalLight(0xffffff, 1.1); key.position.set(2, 3, 3); scene.add(key);
const btn = new THREE.Mesh(new THREE.CylinderGeometry(0.7, 0.7, 0.22, 40), new THREE.MeshStandardMaterial({ color: 0x5b5bf7, roughness: 0.4 }));
btn.rotation.x = Math.PI / 2;
scene.add(btn);
const tip = new THREE.Mesh(new THREE.SphereGeometry(0.14, 24, 24), new THREE.MeshStandardMaterial({ color: 0xffd7a8 }));
scene.add(tip);
function resize() { renderer.setSize(innerWidth, innerHeight); camera.aspect = innerWidth / innerHeight; camera.updateProjectionMatrix(); }
addEventListener('resize', resize); resize();
const BASE_Z = 0.11, PRESS_Z = -0.05;
renderer.setAnimationLoop((t) => {
  const p = (Math.sin(t * 0.0013) + 1) / 2;
  const finZ = 2.4 - p * 2.28;
  tip.position.set(0, 0, finZ);
  const pressed = finZ < BASE_Z + 0.05;
  btn.position.z += ((pressed ? PRESS_Z : BASE_Z) - btn.position.z) * 0.35;
  btn.material.color.set(pressed ? 0x8a8aff : 0x5b5bf7);
  renderer.render(scene, camera);
});