Question

我现在开始学习Three.js，并且首先尝试做一些非常基本的事情，比如创建一个框然后在其上应用变换矩阵，在Z轴上旋转15deg：

<html>
<head>
<title>My first Three.js app</title>
<style>
    body {
        margin: 0;
    }

    canvas {
        width: 100%;
        height: 100%;
    }
</style>
</head>
<body>
<script src="scripts/three.js"></script>
<script>
    var scene = new THREE.Scene();
    var camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 0.1, 100000);

    var renderer = new THREE.WebGLRenderer();
    renderer.setSize(window.innerWidth, window.innerHeight);
    document.body.appendChild(renderer.domElement);

    var geometry = new THREE.BoxGeometry(1, 0.5, 0.1);
    var material = new THREE.MeshBasicMaterial({ color: 0x00ff00 });
    material.wireframe = true;
    var cube = new THREE.Mesh(geometry, material);

    cube.matrixAutoUpdate = false;

    var matrix = new THREE.Matrix4(0.9659,  0.2588, 0.000,  0, 
                                  -0.2588,  0.9659, 0.000,  0,
                                   0.0000,  0.0000, 1.000,  0,
                                   0.0000,  0.0000, 0.000,  1);

    cube.applyMatrix(matrix);

    scene.add(cube);

    camera.position.z = 5;
    //camera.position.x = 5;
    //camera.position.y = 5;

    var n1 = cube.matrix.elements;

    camera.lookAt(new THREE.Vector3(0, 0, 0));

    var render = function () {
        requestAnimationFrame(render);

        //cube.rotation.x += 0.01;
        //cube.rotation.y += 0.01;

        renderer.render(scene, camera);
    };

    render();
</script>
</body>
</html>

问题是盒子根本没有变化，它仍然保持在相同的位置/方向。

如果我检查applied_matrix变量，它会返回一个单位矩阵，就像我从未应用过我的矩阵一样。

我错过了什么？

Answer 1

你在控制台得到一个警告说：THREE.Matrix4：构造函数不再读取参数。改为使用.set（）。

所以请代替：

    var matrix = new THREE.Matrix4(0.9659,  0.2588, 0.000,  0, 
                              -0.2588,  0.9659, 0.000,  0,
                               0.0000,  0.0000, 1.000,  0,
                               0.0000,  0.0000, 0.000,  1);

尝试

    var matrix = new THREE.Matrix4().set((0.9659,  0.2588, 0.000,  0, 
                              -0.2588,  0.9659, 0.000,  0,
                               0.0000,  0.0000, 1.000,  0,
                               0.0000,  0.0000, 0.000,  1);

转换矩阵不适用于Three.js

1 个答案: