three.js入門（四）：紋理Texture之平面紋理

時間 2019-12-04

標籤 three.js 入門紋理 texture 平面欄目 JavaScript 简体版

原文原文鏈接

一、測試頁面：index.htmlhtml

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>測試</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>

二、js代碼實現：chapter6.1.js前端

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() {
    //不是很明白爲何設置紋理須要用requestAnimationFrame
    requestAnimationFrame(animate);
    renderer.render(scene, camera);
}
init();
animate();

單個平面的紋理貼圖會覆蓋整個Geometry的平面，若是要作出商標那樣覆蓋局部區域的貼圖，便知足不了需求。對於這種狀況，初步設想是新增一個小的平面做爲商標貼圖的區域，而後使該平面與原平面緊貼。以下圖：紫色區域的正方體的一個面，左上角是另外一個平面貼圖。canvas

代碼實現：ide

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);//平移紋理貼圖網格模型
    scene.add(planeMesh);

實際操做的過程當中發現，要想正好將貼圖貼在幾何體上，貼圖的位置仍是很難調整的，特別是當集合體的角度很差計算的時候，就更難肯定座標了。不知道當物體在運動過程當中是怎麼保證貼圖的位置正確的...前端真的好難啊= =測試

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