Webgl学习日志(三)——贴图、旋转、移动

还是先放代码。

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>Three框架</title>
    <script src="js/three.js"></script>
    <script src="js/stats.js"></script>
    <script src="js/Tween.js"></script>
    <style type="text/css">
        div#canvas-frame {
            border: none;
            cursor: pointer;
            width: 100%;
            height: 600px;
            background-color: #EEEEEE;
        }
    </style>
    <script>
        function initTween() {
            new TWEEN.Tween(mesh.position)
                    .to({ x: -400 }, 3000).repeat(Infinity).start();
        }

        var renderer;
        var stats;
        function initThree() {
            width = document.getElementById('canvas-frame').clientWidth;
            height = document.getElementById('canvas-frame').clientHeight;
            renderer = new THREE.WebGLRenderer({
                antialias: true
            });
            renderer.setSize(width, height);
            document.getElementById('canvas-frame').appendChild(renderer.domElement);
            renderer.setClearColor(0xFFFFFF, 1.0);

            stats = new Stats();
            stats.domElement.style.position = 'absolute';
            stats.domElement.style.left = '0px';
            stats.domElement.style.top = '0px';
            document.getElementById('canvas-frame').appendChild(stats.domElement);
        }

        var camera;
        function initCamera() {
            camera = new THREE.PerspectiveCamera(45, width / height, 1, 10000);
            camera.position.x = 600;
            camera.position.y = 0;
            camera.position.z = 600;
            camera.up.x = 0;
            camera.up.y = 1;
            camera.up.z = 0;
            camera.lookAt(0,0,0);
        }

        var scene;
        function initScene() {
            scene = new THREE.Scene();
        }

        var light;
        function initLight() {
            light = new THREE.AmbientLight(0xFF0000);
            light.position.set(100, 100, 200);
            scene.add(light);
            light = new THREE.PointLight(0x00FF00);
            light.position.set(0, 0, 300);
            scene.add(light);
        }

        var cube;
        var mesh;
        var mesh2;
        var mesh3;
        function initObject() {
            var geometry = new THREE.CubeGeometry(100, 100, 100);          
            var material = new THREE.MeshPhongMaterial({ map: THREE.ImageUtils.loadTexture('textures/a.jpg') });
            mesh = new THREE.Mesh(geometry, material);
            mesh.position = new THREE.Vector3(0, 0, 0);            
            scene.add(mesh);

            var geometry2 = new THREE.CubeGeometry(100, 100, 100);
            var material2 = new THREE.MeshPhongMaterial({ map: THREE.ImageUtils.loadTexture('textures/a.jpg') });
            mesh2 = new THREE.Mesh(geometry2, material2);
            mesh2.position.set(200, 0, 0);
            scene.add(mesh2);

            var geometry3 = new THREE.CubeGeometry(200, 100, 50, 4, 4);
            var material3 = new THREE.MeshLambertMaterial({ color: 0xFFFFFF });
            var mesh3 = new THREE.Mesh(geometry3, material3);
            mesh3.position.set(0, -150, 0);
            scene.add(mesh3);
        }        

        function threeStart() {
            initThree();
            initCamera();
            initScene();
            initLight();
            initObject();
            animation();
            //initTween();

        }
        function animation() {           
            mesh.rotation.x += 0.1;
            mesh.rotation.y += 0.1;
            mesh2.position.x += 10;            
            renderer.render(scene, camera);
            requestAnimationFrame(animation);
            stats.update();
            //TWEEN.update();
        }

    </script>
</head>

<body onload="threeStart();">
    <div id="canvas-frame"></div>
</body>
</html>

跟上篇日志的内容差不太多，把动画部分注释掉了。

这里贴图主要用到了THREE.MeshPhongMaterial（）这个api，如果不贴图，只是增加颜色，那么用

THREE.MeshLambertMaterial（）这个api即可。

然后旋转移动的方法很多，这里可以通过属性旋转移动，也可以通过方法旋转移动。这里借用一下人家的图，确实很详细。上面的代码是通过修改属性值来修改位置。按理说，这里的方式是有问题的，通过这两种方式的api修改肯定不安全，不知道后面会不会修改这些api。

但以上仅仅只是开始，如果只了解上面的知识，不了解本质的话，后面肯定会很难走。其实这个移动旋转更多的是进行了矩阵的运算。

Webgl学习日志(三)——贴图、旋转、移动

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