如何用Three.js改变CubeGeometry的宽度？

Posted 2021-03-31

我有一个立方体几何和一个网格，我不知道如何改变宽度（或高度......我可以改变x，y和z）。这是我现在所拥有的片段：

geometry = new THREE.CubeGeometry( 200, 200, 200 );
material = new THREE.MeshBasicMaterial( { color: 0xff0000, wireframe: true } );
mesh = new THREE.Mesh( geometry, material );
// WebGL renderer here

function render(){
    mesh.rotation.x += 0.01;
    mesh.rotation.y += 0.02;
    renderer.render( scene, camera );
}

function changeStuff(){
    mesh.geometry.width = 500; //Doesn't work.
    mesh.width = 500; // Doesn't work.
    geometry.width = 500; //Doesn't work.
    mesh.position.x = 500// Works!!

    render();
}

谢谢！

编辑

找到了解决方案：

mesh.scale.x = 500;

答案

只是为了完成问题的评论和解决方案（并在示例代码中提供答案）：

// create a cube, 1 unit for width, height, depth
var geometry = new THREE.CubeGeometry(1,1,1);

// each cube side gets another color
var cubeMaterials = [ 
    new THREE.MeshBasicMaterial({color:0x33AA55, transparent:true, opacity:0.8}),
    new THREE.MeshBasicMaterial({color:0x55CC00, transparent:true, opacity:0.8}), 
    new THREE.MeshBasicMaterial({color:0x000000, transparent:true, opacity:0.8}),
    new THREE.MeshBasicMaterial({color:0x000000, transparent:true, opacity:0.8}), 
    new THREE.MeshBasicMaterial({color:0x0000FF, transparent:true, opacity:0.8}), 
    new THREE.MeshBasicMaterial({color:0x5555AA, transparent:true, opacity:0.8}), 
]; 
// create a MeshFaceMaterial, allows cube to have different materials on each face 
var cubeMaterial = new THREE.MeshFaceMaterial(cubeMaterials); 
var cube = new THREE.Mesh(geometry, cubeMaterial);

cube.position.set(0,0,0);
scene.add( cube );
cube.scale.x = 2.5; // SCALE
cube.scale.y = 2.5; // SCALE
cube.scale.z = 2.5; // SCALE

这里实现了一个稍微高级的动态示例：https://www.matheretter.de/formeln/geometrie/quader/（仍然是相同的缩放）

另一答案

缩放属性可用于更改立方体的宽度，高度和深度。

    //creating a cube 
    var geometry = new THREE.BoxGeometry(1,1,1);
    var material = new THREE.MeshBasicMaterial({color:"white"});
    var cube = new THREE.Mesh(geometry, material);


    //changing size of cube which is created.
    cube.scale.x = 30;
    cube.scale.y = 30;
    cube.scale.z = 30;

另一答案

您可以处置多维数据集的几何体并像这样影响新的几何体：

let new_geometry = new THREE.CubeGeometry(500,200,200);
geometry.dispose();
cube.geometry = new_geometry;