Three.js interaction - raycasting, controls, mouse/touch input, object selection. Use when handling user input, implementing click detection, adding camera controls, or creating interactive 3D experiences.
インストールする前に、エージェントに与えられる指示の中身を確認できます。
import * as THREE from "three";
import { OrbitControls } from "three/addons/controls/OrbitControls.js";
// Camera controls
const controls = new OrbitControls(camera, renderer.domElement);
controls.enableDamping = true;
// Raycasting for click detection
const raycaster = new THREE.Raycaster();
const mouse = new THREE.Vector2();
function onClick(event) {
mouse.x = (event.clientX / window.innerWidth) * 2 - 1;
mouse.y = -(event.clientY / window.innerHeight) * 2 + 1;
raycaster.setFromCamera(mouse, camera);
const intersects = raycaster.intersectObjects(scene.children);
if (intersects.length > 0) {
console.log("Clicked:", intersects[0].object);
}
}
window.addEventListener("click", onClick);
const raycaster = new THREE.Raycaster();
// From camera (mouse picking)
raycaster.setFromCamera(mousePosition, camera);
// From any origin and direction
raycaster.set(origin, direction); // origin: Vector3, direction: normalized Vector3
// Get intersections
const intersects = raycaster.intersectObjects(objects, recursive);
// intersects array contains:
// {
// distance: number, // Distance from ray origin
// point: Vector3, // Intersection point in world coords
// face: Face3, // Intersected face
// faceIndex: number, // Face index
// object: Object3D, // Intersected object
// uv: Vector2, // UV coordinates at intersection
// uv1: Vector2, // Second UV channel
// normal: Vector3, // Interpolated face normal
// instanceId: number // For InstancedMesh
// }
const mouse = new THREE.Vector2();
function updateMouse(event) {
// For full window
mouse.x = (event.clientX / window.innerWidth) * 2 - 1;
mouse.y = -(event.clientY / window.innerHeight) * 2 + 1;
}
// For specific canvas element
function updateMouseCanvas(event, canvas) {
const rect = canvas.getBoundingClientRect();
mouse.x = ((event.clientX - rect.left) / rect.width) * 2 - 1;
mouse.y = -((event.clientY - rect.top) / rect.height) * 2 + 1;
}
function onTouchStart(event) {
event.preventDefault();
if (event.touches.length === 1) {
const touch = event.touches[0];
mouse.x = (touch.clientX / window.innerWidth) * 2 - 1;
mouse.y = -(touch.clientY / window.innerHeight) * 2 + 1;
raycaster.setFromCamera(mouse, camera);
const intersects = raycaster.intersectObjects(clickableObjects);
if (intersects.length > 0) {
handleSelection(intersects[0]);
}
}
}
renderer.domElement.addEventListener("touchstart", onTouchStart);
const raycaster = new THREE.Raycaster();
// Near/far clipping (default: 0, Infinity)
raycaster.near = 0;
raycaster.far = 100;
// Line/Points precision
raycaster.params.Line.threshold = 0.1;
raycaster.params.Points.threshold = 0.1;
// Layers (only intersect objects on specific layers)
raycaster.layers.set(1);
// Only check specific objects
const clickables = [mesh1, mesh2, mesh3];
const intersects = raycaster.intersectObjects(clickables, false);
// Use layers for filtering
mesh1.layers.set(1); // Clickable layer
raycaster.layers.set(1);
// Throttle raycast for hover effects
let lastRaycast = 0;
function onMouseMove(event) {
const now = Date.now();
if (now - lastRaycast < 50) return; // 20fps max
lastRaycast = now;
// Raycast here
}
import { OrbitControls } from "three/addons/controls/OrbitControls.js";
const controls = new OrbitControls(camera, renderer.domElement);
// Damping (smooth movement)
controls.enableDamping = true;
controls.dampingFactor = 0.05;
// Rotation limits
controls.minPolarAngle = 0; // Top
controls.maxPolarAngle = Math.PI / 2; // Horizon
controls.minAzimuthAngle = -Math.PI / 4; // Left
controls.maxAzimuthAngle = Math.PI / 4; // Right
// Zoom limits
controls.minDistance = 2;
controls.maxDistance = 50;
// Enable/disable features
controls.enableRotate = true;
controls.enableZoom = true;
controls.enablePan = true;
// Auto-rotate
controls.autoRotate = true;
controls.autoRotateSpeed = 2.0;
// Target (orbit point)
controls.target.set(0, 1, 0);
// Update in animation loop
function animate() {
controls.update(); // Required for damping and auto-rotate
renderer.render(scene, camera);
}
import { FlyControls } from "three/addons/controls/FlyControls.js";
const controls = new FlyControls(camera, renderer.domElement);
controls.movementSpeed = 10;
controls.rollSpeed = Math.PI / 24;
controls.dragToLook = true;
// Update with delta
function animate() {
controls.update(clock.getDelta());
renderer.render(scene, camera);
}
import { FirstPersonControls } from "three/addons/controls/FirstPersonControls.js";
const controls = new FirstPersonControls(camera, renderer.domElement);
controls.movementSpeed = 10;
controls.lookSpeed = 0.1;
controls.lookVertical = true;
controls.constrainVertical = true;
controls.verticalMin = Math.PI / 4;
controls.verticalMax = (Math.PI * 3) / 4;
function animate() {
controls.update(clock.getDelta());
}
import { PointerLockControls } from "three/addons/controls/PointerLockControls.js";
const controls = new PointerLockControls(camera, document.body);
// Lock pointer on click
document.addEventListener("click", () => {
controls.lock();
});
controls.addEventListener("lock", () => {
console.log("Pointer locked");
});
controls.addEventListener("unlock", () => {
console.log("Pointer unlocked");
});
// Movement
const velocity = new THREE.Vector3();
const direction = new THREE.Vector3();
const moveForward = false;
const moveBackward = false;
document.addEventListener("keydown", (event) => {
switch (event.code) {
case "KeyW":
moveForward = true;
break;
case "KeyS":
moveBackward = true;
break;
}
});
function animate() {
if (controls.isLocked) {
direction.z = Number(moveForward) - Number(moveBackward);
direction.normalize();
velocity.z -= direction.z * 0.1;
velocity.z *= 0.9; // Friction
controls.moveForward(-velocity.z);
}
}
import { TrackballControls } from "three/addons/controls/TrackballControls.js";
const controls = new TrackballControls(camera, renderer.domElement);
controls.rotateSpeed = 2.0;
controls.zoomSpeed = 1.2;
controls.panSpeed = 0.8;
controls.staticMoving = true;
function animate() {
controls.update();
}
import { MapControls } from "three/addons/controls/MapControls.js";
const controls = new MapControls(camera, renderer.domElement);
controls.enableDamping = true;
controls.dampingFactor = 0.05;
controls.screenSpacePanning = false;
controls.maxPolarAngle = Math.PI / 2;
Gizmo for moving/rotating/scaling objects.
import { TransformControls } from "three/addons/controls/TransformControls.js";
const transformControls = new TransformControls(camera, renderer.domElement);
scene.add(transformControls);
// Attach to object
transformControls.attach(selectedMesh);
// Switch modes
transformControls.setMode("translate"); // 'translate', 'rotate', 'scale'
// Change space
transformControls.setSpace("local"); // 'local', 'world'
// Size
transformControls.setSize(1);
// Events
transformControls.addEventListener("dragging-changed", (event) => {
// Disable orbit controls while dragging
orbitControls.enabled = !event.value;
});
transformControls.addEventListener("change", () => {
renderer.render(scene, camera);
});
// Keyboard shortcuts
window.addEventListener("keydown", (event) => {
switch (event.key) {
case "g":
transformControls.setMode("translate");
break;
case "r":
transformControls.setMode("rotate");
break;
case "s":
transformControls.setMode("scale");
break;
case "Escape":
transformControls.detach();
break;
}
});
Drag objects directly.
import { DragControls } from "three/addons/controls/DragControls.js";
const draggableObjects = [mesh1, mesh2, mesh3];
const dragControls = new DragControls(
draggableObjects,
camera,
renderer.domElement,
);
dragControls.addEventListener("dragstart", (event) => {
orbitControls.enabled = false;
event.object.material.emissive.set(0xaaaaaa);
});
dragControls.addEventListener("drag", (event) => {
// Constrain to ground plane
event.object.position.y = 0;
});
dragControls.addEventListener("dragend", (event) => {
orbitControls.enabled = true;
event.object.material.emissive.set(0x000000);
});
const raycaster = new THREE.Raycaster();
const mouse = new THREE.Vector2();
let selectedObject = null;
function onMouseDown(event) {
mouse.x = (event.clientX / window.innerWidth) * 2 - 1;
mouse.y = -(event.clientY / window.innerHeight) * 2 + 1;
raycaster.setFromCamera(mouse, camera);
const intersects = raycaster.intersectObjects(selectableObjects);
// Deselect previous
if (selectedObject) {
selectedObject.material.emissive.set(0x000000);
}
// Select new
if (intersects.length > 0) {
selectedObject = intersects[0].object;
selectedObject.material.emissive.set(0x444444);
} else {
selectedObject = null;
}
}
import { SelectionBox } from "three/addons/interactive/SelectionBox.js";
import { SelectionHelper } from "three/addons/interactive/SelectionHelper.js";
const selectionBox = new SelectionBox(camera, scene);
const selectionHelper = new SelectionHelper(renderer, "selectBox"); // CSS class
document.addEventListener("pointerdown", (event) => {
selectionBox.startPoint.set(
(event.clientX / window.innerWidth) * 2 - 1,
-(event.clientY / window.innerHeight) * 2 + 1,
0.5,
);
});
document.addEventListener("pointermove", (event) => {
if (selectionHelper.isDown) {
selectionBox.endPoint.set(
(event.clientX / window.innerWidth) * 2 - 1,
-(event.clientY / window.innerHeight) * 2 + 1,
0.5,
);
}
});
document.addEventListener("pointerup", (event) => {
selectionBox.endPoint.set(
(event.clientX / window.innerWidth) * 2 - 1,
-(event.clientY / window.innerHeight) * 2 + 1,
0.5,
);
const selected = selectionBox.select();
console.log("Selected objects:", selected);
});
const raycaster = new THREE.Raycaster();
const mouse = new THREE.Vector2();
let hoveredObject = null;
function onMouseMove(event) {
mouse.x = (event.clientX / window.innerWidth) * 2 - 1;
mouse.y = -(event.clientY / window.innerHeight) * 2 + 1;
raycaster.setFromCamera(mouse, camera);
const intersects = raycaster.intersectObjects(hoverableObjects);
// Reset previous hover
if (hoveredObject) {
hoveredObject.material.color.set(hoveredObject.userData.originalColor);
document.body.style.cursor = "default";
}
// Apply new hover
if (intersects.length > 0) {
hoveredObject = intersects[0].object;
if (!hoveredObject.userData.originalColor) {
hoveredObject.userData.originalColor =
hoveredObject.material.color.getHex();
}
hoveredObject.material.color.set(0xff6600);
document.body.style.cursor = "pointer";
} else {
hoveredObject = null;
}
}
window.addEventListener("mousemove", onMouseMove);
See references/interaction-reference.md for keyboard input, world-screen coordinate conversion, event handling best practices, performance tips, and see also.
まだレビューはありません。使ってみた感想をお寄せください。
概要と使いどころ
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日本語の概要は準備中です。原文の説明を表示しています。
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日本語の概要は準備中です。原文の説明を表示しています。
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日本語の概要は準備中です。原文の説明を表示しています。
Create algorithmic art using p5.js with seeded randomness and interactive parameter exploration. Use when users request generative art, algorithmic art, flow fields, or particle systems. Create original works rather than copying existing artists.
日本語の概要は準備中です。原文の説明を表示しています。
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日本語の概要は準備中です。原文の説明を表示しています。
Use when starting creative work (features, components, functionality, or behavior changes) to clarify user intent, requirements, and design before implementation.
日本語の概要は準備中です。原文の説明を表示しています。