我有一个使用3js渲染的房子的3D模型(.obj(。我的代码中的光线投射器正在工作，但我遇到了一个问题，即它选择我尝试选择的对象后面和前面的每个对象。我只想返回我选择的对象的名称。任何帮助将不胜感激。目前，我现在只是将对象的名称发送到控制台。
function main() {
const canvas = document.querySelector('#c');
const renderer = new THREE.WebGLRenderer({canvas});
const renderer2 = new THREE.WebGLRenderer({canvas});
var kitchenCameraActive = false;
document.getElementById("roomSelect").addEventListener("change", changeIt);
function changeIt(e) {
//e.target.value
document.getElementById(e.target.value).click();
console.log(e);
}
var fov = 45;
var aspect = 2; // the canvas default
var near = 0.1;
var far = 100;
var camera = new THREE.PerspectiveCamera(fov, aspect, near, far);
camera.position.set(-97.570, 5.878, -5.289);
camera.rotation.set(0,0,0);
const controls = new THREE.OrbitControls(camera, canvas);
controls.target.set(0, 5, 0);
controls.update();
document.getElementById("kitchen").addEventListener("click", changeCamera);
document.getElementById("bathroom").addEventListener("click", changeCamera);
document.getElementById("deck").addEventListener("click", changeCamera);
document.getElementById("livingRoom").addEventListener("click", changeCamera);
document.getElementById("bedRoom").addEventListener("click", changeCamera);
document.getElementById("walkway").addEventListener("click", changeCamera);
document.getElementById("sideHouse").addEventListener("click", changeCamera);
document.getElementById("frontPorch").addEventListener("click", changeCamera);
document.getElementById("garageDoor").addEventListener("click", changeCamera);
document.getElementById("insideGarage").addEventListener("click", changeCamera);
function changeCamera(e) {
camera.rotation.set(e.toElement.attributes[5].nodeValue, e.toElement.attributes[6].nodeValue, e.toElement.attributes[7].nodeValue);
camera.fov = e.toElement.attributes[4].nodeValue;
camera.position.set(e.toElement.attributes[1].nodeValue, e.toElement.attributes[2].nodeValue, e.toElement.attributes[3].nodeValue);
camera.updateProjectionMatrix();
if (e.target.id == "walkway" || e.target.id == "frontPorch" || e.target.id == "garageDoor" || e.target.id == "insideGarage")
{
controls.target.set(0, 5, 0);
controls.update();
}
//controls.target.set(0, 5, 0);
//controls.update();
//controls.minPolarAngle = Math.PI/2;
//controls.maxPolarAngle = Math.PI/2;
console.log(e);
//controls.enabled = false;
}
const scene = new THREE.Scene();
scene.background = new THREE.Color('black');
{
const planeSize = 40;
}
function frameArea(sizeToFitOnScreen, boxSize, boxCenter, camera) {
const halfSizeToFitOnScreen = sizeToFitOnScreen * 0.5;
const halfFovY = THREE.Math.degToRad(camera.fov * .5);
const distance = halfSizeToFitOnScreen / Math.tan(halfFovY);
// compute a unit vector that points in the direction the camera is now
// in the xz plane from the center of the box
const direction = (new THREE.Vector3()).subVectors(camera.position, boxCenter).multiply(new THREE.Vector3(1, 0, 1)).normalize();
// move the camera to a position distance units way from the center
// in whatever direction the camera was from the center already
camera.position.copy(direction.multiplyScalar(distance).add(boxCenter));
// pick some near and far values for the frustum that
// will contain the box.
camera.near = boxSize / 100;
camera.far = boxSize * 100;
camera.updateProjectionMatrix();
// point the camera to look at the center of the box
camera.lookAt(boxCenter.x, boxCenter.y, boxCenter.z);
}
var loader = new THREE.OBJLoader();
// load a resource
loader.load(
// resource URL
'dapHouseGood5.obj',
// called when resource is loaded
function ( object ) {
scene.add( object );
},
// called when loading is in progresses
function ( xhr ) {
console.log( ( xhr.loaded / xhr.total * 100 ) + '% loaded' );
},
// called when loading has errors
function ( error ) {
console.log( 'An error happened' );
});
function resizeRendererToDisplaySize(renderer) {
const canvas = renderer.domElement;
const width = canvas.clientWidth;
const height = canvas.clientHeight;
const needResize = canvas.width !== width || canvas.height !== height;
if (needResize) {
renderer.setSize(width, height, false);
}
return needResize;
}
function render() {
if (resizeRendererToDisplaySize(renderer)) {
const canvas = renderer.domElement;
camera.aspect = canvas.clientWidth / canvas.clientHeight;
camera.updateProjectionMatrix();
}
renderer.render(scene, camera);
requestAnimationFrame(render);
}
requestAnimationFrame(render);
function onPositionChange(o) {
console.log("position changed in object");
console.log(o);
}
controls.addEventListener('change', onPositionChange);
var mouse = new THREE.Vector2();
var raycaster, mouse = { x : 0, y : 0};
init();
function init () {
//Usual setup code here.
raycaster = new THREE.Raycaster();
renderer.domElement.addEventListener( 'click', raycast, false );
//Next setup code there.
}
function raycast ( e ) {
//1. sets the mouse position with a coordinate system where the center
// of the screen is the origin
mouse.x = ( e.clientX / window.innerWidth ) * 2 - 1;
mouse.y = - ( e.clientY / window.innerHeight ) * 2 + 1;
//2. set the picking ray from the camera position and mouse coordinates
raycaster.setFromCamera( mouse, camera );
//var mouse3D = new THREE.Vector3( ( event.clientX / window.innerWidth ) * 2 - 1, -( event.clientY / window.innerHeight ) * 2 + 1, 0.5 );
//raycaster.setFromCamera( mouse3D, camera );
//3. compute intersections
var intersects = raycaster.intersectObjects( scene.children, true );
for ( var i = 0; i < intersects.length; i++ ) {
//console.log( intersects[ i ].object.id );
console.log( intersects[ i ].object.name );
//console.log( intersects[ i ] );
}
}
}
main();
raycaster.intersectObjects( objects, recursive = true )调用返回针对您提供的所有对象及其子对象的交集。如果只想查找特定对象的交集，则仅在调用intersectObjects时包含该对象。这也将提高性能。
如果您不知道需要哪个对象，则返回按距离排序的相交结果。最近的对象是第一个，你可以使用它。
请参阅：https://threejs.org/docs/#api/en/core/Raycaster