ShaderMaterial #0

HelloWorld

by yi hom

HTML

<div id="info">GLSL Exercises</div>
<script src="http://cdnjs.cloudflare.com/ajax/libs/three.js/r70/three.min.js"></script>
<script src="https://dl.dropboxusercontent.com/u/3587259/Code/Threejs/OrbitControls.js">
    
</script>
<script id="myVertexShader" type="x-shader/x-vertex">
    varying vec3 mycolor;
    void main() {
        // input: position (vec3, object coordinate)
        //        uv (vec2, texture coordinate)
        // output: gl_Position (vec4) clip coordinate
        gl_Position = projectionMatrix * modelViewMatrix * vec4(position, 1.0);
    
        if(position.x > 0.0)
            mycolor = vec3(1.0 , 0.0 , 0.0);
        else
            mycolor = vec3(0.0 , 1.0 , 0.0);
    }
</script>
<script id="myFragmentShader" type="x-shader/x-fragment">
    varying vec3 mycolor;
    void main() {
        // output: gl_FragColor (vec4, rgba)
        gl_FragColor = vec4(mycolor, 1.0);
        
    }
</script>

CSS

body {
    background-color: #fff;
    color: #111;
    margin: 0px;
    overflow: hidden;
    font-family: Monospace;
    font-size: 10px;
    position: absolute;
}
#info {
    position: absolute;
    top: 0px;
    width: 100%;
    padding: 5px;
    text-align: center;
    color: #ffff00
}

JavaScript

var clock = new THREE.Clock();
var scene, renderer, camera;
var mesh, mesh2;
var controls;
var angle=0;
var meshMaterial;

init();
animate();

function init() {
    var width = window.innerWidth;
    var height = window.innerHeight;

    renderer = new THREE.WebGLRenderer({
        antialias: true
    });
    renderer.setSize(width, height);
    document.body.appendChild(renderer.domElement);
    renderer.setClearColor(0x888888);

    scene = new THREE.Scene();

    camera = new THREE.PerspectiveCamera(45, width / height, 0.1, 10000);
    camera.position.y = 160;
    camera.position.z = 400;
    camera.lookAt(new THREE.Vector3(0, 0, 0));

    controls = new THREE.OrbitControls(camera, render.domElement);

    var gridXZ = new THREE.GridHelper(100, 10);
    gridXZ.setColors(new THREE.Color(0xff0000), new THREE.Color(0xffffff));
    scene.add(gridXZ);

    var pointLight = new THREE.PointLight(0xffffff);
    pointLight.position.set(0, 300, 200);
    scene.add(pointLight);

    meshMaterial = new THREE.ShaderMaterial({
        wireframe: true,
        vertexShader: document.getElementById('myVertexShader').textContent,
        fragmentShader: document.getElementById('myFragmentShader').textContent
    });

    var geometry = new THREE.TorusKnotGeometry(10, 3, 100, 16);

    mesh = new THREE.Mesh(geometry,
    new THREE.MeshLambertMaterial({
        color: 0x12ff32
    }));
//    scene.add(mesh);

    mesh2 = mesh.clone();
    mesh2.material = meshMaterial;
    scene.add(mesh2);
    mesh2.position.set(17, 0, 0);
//    mesh2.rotation.y=angle;
    var ambientLight = new THREE.AmbientLight(0x111111);
    scene.add(ambientLight);

    window.addEventListener('resize', onWindowResize, false);
}

function onWindowResize() {
    camera.aspect = window.innerWidth / window.innerHeight;
    camera.updateProjectionMatrix();
    renderer.setSize(window.innerWidth, window.innerHeight);
}

function animate() {
    requestAnimationFrame(animate);
    controls.update();
   ...