Question

    var leftKey = 72;

    var rightKey = 74;


    document.onkeydown = checkKey;
    function checkKey(e){
        e = e || window.event;
    if(e.keyCode === leftKey){
           car.position.z = car.position.z -10;

       }
    if(e.keyCode === rightKey){
           car.position.z = car.position.z +10;

       }
    } 

    car.position.x ++;

你好，我正试图让汽车向前推进游戏的每次更新。但代码'car.position.x +++;'抛出错误'TypeError：无法读取未定义的属性'位置'。我怎样才能解决这个问题？谢谢！

myColladaLoader = new THREE.ColladaLoader();
myColladaLoader.options.convertUpAxis = true;

myColladaLoader.load( 'car.DAE', function ( collada ) {
        // Her the dae in a global variable.
        car = collada.scene;

        // Position your model in the scene (world space).
        car.position.x = -1850;
        car.position.y = 0;
        car.position.z = 0;

        // Scale your model to the correct size.
        car.scale.x = car.scale.y = car.scale.z = 0.2;
        car.updateMatrix();

        // Add the model to the scene.
        scene.add( car );
    } );

在上面添加汽车！

Answer 1

这里的问题显然不是范围错误，而是javascript渲染功能在汽车甚至实现之前更新。解决这个问题的方法是推迟前进的车辆直到那里。

请查看three.js Documentation

向前迈进three.js

1 个答案: