Question

我试图在three.js中一次移动多个球。我创造了一个创造一个球并使用它创造三个球的功能。之后我创建了一个移动球的功能，它适用于一个球，但每当我试图将它们全部移动时它就不起作用。任何帮助将非常感激。这是代码：

球功能：

function Ball(valuex, valuey, valuez, ballname, color)
{
   var balMaterial, balGeometry, balMesh;
   balMaterial = new THREE.MeshLambertMaterial({ color: color});
   balGeometry = new THREE.SphereGeometry(0.3,50,50);
   balMesh = new THREE.Mesh(balGeometry, balMaterial);
   balMesh.position.set(valuex,valuey,valuez);
   balMesh.name = ballname;
   balMesh.ballDirection = new THREE.Vector3();
   balMesh.ballDirection.x = -5;
   balMesh.ballDirection.z = 1;
   balMesh.ballDirection.normalize();
   balMesh.moveSpeed = 25;
   scene.add(balMesh);
}

移动球：

function moveBalls (ball) {
var tempbal = scene.getObjectByName(ball);
var ballDirection = tempbal.ballDirection;
tempbal.position.add(speed.copy(ballDirection).multiplyScalar(clock.getDelta() * tempbal.moveSpeed));



    if (tempbal.position.x < -4.7) {
        ballDirection.x = Math.abs(ballDirection.x);
    }
    if (tempbal.position.x > 4.7) {
        ballDirection.x = -Math.abs(ballDirection.x);
    }
    if (tempbal.position.z > 12.2) {
        ballDirection.z = -Math.abs(ballDirection.z);
    }
    if (tempbal.position.z < -12.2) {
        ballDirection.z = Math.abs(ballDirection.z);
    }
    if (tempbal.moveSpeed > 0)
    {
        tempbal.moveSpeed = tempbal.moveSpeed - 0.002;
    }
}

创建球：

Ball(0,4.5,0, "ball1", 0xffffff);
Ball(2,4.5,0, "ball2", 0xffffff);
Ball(0,4.5,6, "ball3", 0xff0000);

动画场景：

function animateScene()
{
    moveBalls("ball1");
    moveBalls("ball2");
    moveBalls("ball3");
    requestAnimationFrame(animateScene);

    renderer.render(scene, camera);
}

PS：我是新来的，这是我的第一篇文章，所以如果我在这篇文章中做错了，请告诉我，以便我可以从中学习。

Answer 1

函数clock.getDelta()返回自上次调用clock.getDelta()后经过的秒数，这意味着只有第一个球可能会移动。实际上，第一个球叫getDelta()（返回大于0的东西）。在相同的框架（大约在同一时间），你为第二个球调用clock.getDelta()，它返回0.第三个球也是如此。

尝试执行以下操作：

function moveBalls (ball, deltaTime) {
   var tempbal = scene.getObjectByName(ball);
    var ballDirection = tempbal.ballDirection;
    tempbal.position.add(speed.copy(ballDirection).multiplyScalar(deltaTime 
* tempbal.moveSpeed));

    if (tempbal.position.x < -4.7) {
        ballDirection.x = Math.abs(ballDirection.x);
    }
    if (tempbal.position.x > 4.7) {
        ballDirection.x = -Math.abs(ballDirection.x);
    }
    if (tempbal.position.z > 12.2) {
        ballDirection.z = -Math.abs(ballDirection.z);
    }
    if (tempbal.position.z < -12.2) {
        ballDirection.z = Math.abs(ballDirection.z);
    }
    if (tempbal.moveSpeed > 0)
    {
        tempbal.moveSpeed = tempbal.moveSpeed - 0.002;
    }
}

// ...

function animateScene()
{
    var deltaTime = clock.getDelta() ;
    moveBalls("ball1", deltaTime);
    moveBalls("ball2", deltaTime);
    moveBalls("ball3", deltaTime);
    requestAnimationFrame(animateScene);

    renderer.render(scene, camera);
}

在three.js中一次移动多个对象

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