Question

for ( var i = 0; i < 100; i ++ ) {

    var particle = new THREE.Particle( new THREE.ParticleCanvasMaterial( { color: 0x666666, program: programStroke } ) );
    particle.position.x = Math.random() * 800 - 400;
    particle.position.y = Math.random() * 800 - 400;
    particle.position.z = Math.random() * 800 - 400;
    particle.scale.x = particle.scale.y = Math.random() * 10 + 10;
    scene.add(particle);
    scene.children[i].id = "q"+i;  // to select item using document.getElementById();
}   

projector = new THREE.Projector();

renderer = new THREE.CanvasRenderer();
renderer.setSize( window.innerWidth, window.innerHeight );

container.appendChild( renderer.domElement );
if(showStats == true){
    stats = new Stats();
    stats.domElement.style.position = 'absolute';
    stats.domElement.style.top = '0px';
    container.appendChild( stats.domElement );
}
document.addEventListener( 'mousemove', onDocumentMouseMove, false );
window.addEventListener( 'resize', onWindowResize, false );
console.log("1 -- "+scene);
console.log("2 -- "+scene.children);
console.log("3 -- "+document.getElementById('q1');

我试图访问场景中的粒子，所以我在将它们添加到场景之前预先定义了id。当我打印出scene.children时，我可以看到它们的ID类似于'q0'，'q1'，'q2'....但是，document.getElementById（）不允许我访问这些项目。在这种情况下，我该怎么办？

Answer 1

而不是：

scene.children[i].id = "q"+i;

做的：

particle.name = "q"+i;

然后

scene.traverse (function (object)
{
    if (object instanceof THREE.Particle)
    {
        if (object.name === 'q10')
            // do what you want with it.
    }
});

Three.js，如何访问场景中的项目？我应该使用document.getElementById（）吗？

1 个答案: