parametric geometry

for sand modeling

by jmchen

HTML

<div id="info">demo page</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>

CSS

#info {
    position: absolute;
    top: 0px;
    width: 100%;
    padding: 10px;
    text-align: center;
    color: #ff0000
}

JavaScript

var camera, scene, renderer, geometry, material, mesh, light, controls;
var clock = new THREE.Clock();

init();
animate();

function init() {

    scene = new THREE.Scene();

    camera = new THREE.PerspectiveCamera(50, window.innerWidth / window.innerHeight, 1, 10000);
    camera.position.z = 500;
    scene.add(camera);

    meshFunc = function (u0, v0) {
        return new THREE.Vector3(-100 + 200 * u0, 3 * Math.sin(20 * (u0 + v0)), -100 + 200 * v0);
    };
    geometry = new THREE.ParametricGeometry(meshFunc, 40, 40);
    geometry.computeFaceNormals();
    geometry.computeVertexNormals();

    THREE.ImageUtils.crossOrigin = '';
    var texture = THREE.ImageUtils.loadTexture('http://jyunming-chen.github.io/tutsplus/images/chia.jpg');
    var bumptex = THREE.ImageUtils.loadTexture('http://jyunming-chen.github.io/tutsplus/images/wood_oak_002_bump.jpg');
    material = new THREE.MeshPhongMaterial({
        color: 0xff1234,
        wireframe: false,
        side: THREE.DoubleSide,
        //map: texture,
        bumpMap: bumptex,
        bumpScale: 0.8
    });

    mesh = new THREE.Mesh(geometry, material);
    scene.add(mesh);

    light = new THREE.PointLight(0xffffff);
    light.position.set(100, 300, 200);
    scene.add(light);

    var axis = new THREE.AxisHelper(20);
    scene.add(axis);

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

    renderer = new THREE.WebGLRenderer();
    renderer.setSize(window.innerWidth, window.innerHeight);
    renderer.setClearColor(0x888888);

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

    document.body.appendChild(renderer.domElement);
   // mesh.geometry.normalsNeedUpdate = true;
   // mesh.geometry.verticesNeedUpdate = true;

}


function animate() {
    var time = clock.getElapsedTime();

    var nvs = mesh.geometry.vertices.length;
    for (var i = 0; i < nvs; i++) {
      ...