three.js入门（四）：纹理Texture之平面纹理

2019独角兽企业重金招聘Python工程师标准>>>

1、测试页面：index.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>测试</title>
    <script src="js/three.min.js"></script>
    <script src="js/stats.min.js"></script>
    <script src="js/tweenjs.min.js"></script>
    <style>
        html, body {
            width: 100%;
            height: 100%;
            margin: 0;
            padding: 0;
        }
    </style>
</head>
<body>
<canvas></canvas>
</body>
<script src="js/chapter/chapter6.1.js"></script>
</html>

2、js代码实现：chapter6.1.js

var scene, camera, renderer;

function init() {
    //init scene
    scene = new THREE.Scene();

    //init renderer
    var canvas = document.body.querySelector("canvas");
    canvas.width = window.innerWidth;
    canvas.height = window.innerHeight;
    renderer = new THREE.WebGLRenderer({
        canvas: canvas,
        antialias: true
    });
    renderer.setSize(window.innerWidth, window.innerHeight);
    renderer.setClearColor(0x000000, 1);

    //init camera
    camera = new THREE.PerspectiveCamera(45, window.innerWidth / window.innerHeight, 1, 1000);
    camera.position.set(0, 0, 100);
    camera.up.set(0, 1, 0);
    camera.lookAt(0, 0, 0);

    //init light
    var light = new THREE.PointLight(0xffffff);
    light.position.set(0, 0, 100);
    scene.add(light);

    var geometry = new THREE.PlaneGeometry(60, 30);
    var texture = new THREE.TextureLoader().load("images/a.jpg");
    var material = new THREE.MeshLambertMaterial({
        map: texture,
        side: THREE.DoubleSide
    });
    var mesh = new THREE.Mesh(geometry, material);
    scene.add(mesh);
}

function animate() {
    //不是很明白为什么设置纹理需要用requestAnimationFrame
    requestAnimationFrame(animate);
    renderer.render(scene, camera);
}
init();
animate();

单个平面的纹理贴图会覆盖整个Geometry的平面，如果要做出商标那样覆盖局部区域的贴图，便满足不了需求。对于这种情况，初步设想是新增一个小的平面作为商标贴图的区域，然后使该平面与原平面紧贴。如下图：紫色区域的正方体的一个面，左上角是另一个平面贴图。

代码实现：

var box = new THREE.BoxGeometry(25, 25, 25);
    var boxMaterial = new THREE.MeshLambertMaterial({color: 0xDDA0DD});
    var boxMesh = new THREE.Mesh(box, boxMaterial);
    scene.add(boxMesh);

    var plane = new THREE.PlaneGeometry(6, 4);
    var texture = new THREE.TextureLoader().load("images/a.jpg");
    var planeMaterial = new THREE.MeshLambertMaterial({
        map: texture
    });
    var planeMesh = new THREE.Mesh(plane, planeMaterial);
    planeMesh.translateX(-9);
    planeMesh.translateY(10);
    planeMesh.translateZ(15.6);//平移纹理贴图网格模型
    scene.add(planeMesh);

实际操作的过程中发现，要想正好将贴图贴在几何体上，贴图的位置还是很难调整的，特别是当集合体的角度不好计算的时候，就更难确定坐标了。不知道当物体在运动过程中是怎么保证贴图的位置正确的...前端真的好难啊= =

转载于:https://my.oschina.net/u/4108765/blog/3059560

three.js入门（四）：纹理Texture之平面纹理

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