<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<head>
<script type="text/javascript" src="libs/three.js"></script>
<script type="text/javascript">
function init() {
var renderer = new THREE.WebGLRenderer({
canvas: document.getElementById('mainCanvas')
});
renderer.setClearColor(0x000000);
var scene = new THREE.Scene();
// camera
var camera = new THREE.OrthographicCamera(-5, 5, 3.75, -3.75, 0.1, 100);
camera.position.set(25, 25, 25);
camera.lookAt(new THREE.Vector3(0, 0, 0));
scene.add(camera);
// draw axes to help you understand the coordinate
drawAxes(scene);
var material = new THREE.MeshBasicMaterial({
color: 0xffff00,
wireframe: true
});
// init an empty geometry
var geometry = new THREE.Geometry();
// set vertices
// 4 vertices on top
geometry.vertices.push(new THREE.Vector3(-1, 2, -1));
geometry.vertices.push(new THREE.Vector3(1, 2, -1));
geometry.vertices.push(new THREE.Vector3(1, 2, 1));
geometry.vertices.push(new THREE.Vector3(-1, 2, 1));
// 4 vertices on bottom
geometry.vertices.push(new THREE.Vector3(-2, 0, -2));
geometry.vertices.push(new THREE.Vector3(2, 0, -2));
geometry.vertices.push(new THREE.Vector3(2, 0, 2));
geometry.vertices.push(new THREE.Vector3(-2, 0, 2));
// set faces
// top face
geometry.faces.push(new THREE.Face3(0, 1, 3));
geometry.faces.push(new THREE.Face3(1, 2, 3));
// bottom face
geometry.faces.push(new THREE.Face3(4, 5, 6));
geometry.faces.push(new THREE.Face3(5, 6, 7));
// side faces
geometry.faces.push(new THREE.Face3(1, 5, 6));
geometry.faces.push(new THREE.Face3(6, 2, 1));
geometry.faces.push(new THREE.Face3(2, 6, 7));
geometry.faces.push(new THREE.Face3(7, 3, 2));
geometry.faces.push(new THREE.Face3(3, 7, 0));
geometry.faces.push(new THREE.Face3(7, 4, 0));
geometry.faces.push(new THREE.Face3(0, 4, 5));
geometry.faces.push(new THREE.Face3(0, 5, 1));
var mesh = new THREE.Mesh(geometry, material);
scene.add(mesh);
// render
renderer.render(scene, camera);
}
function drawAxes(scene) {
// x-axis
var xGeo = new THREE.Geometry();
xGeo.vertices.push(new THREE.Vector3(0, 0, 0));
xGeo.vertices.push(new THREE.Vector3(1, 0, 0));
var xMat = new THREE.LineBasicMaterial({
color: 0xff0000
});
var xAxis = new THREE.Line(xGeo, xMat);
scene.add(xAxis);
// y-axis
var yGeo = new THREE.Geometry();
yGeo.vertices.push(new THREE.Vector3(0, 0, 0));
yGeo.vertices.push(new THREE.Vector3(0, 1, 0));
var yMat = new THREE.LineBasicMaterial({
color: 0x00ff00
});
var yAxis = new THREE.Line(yGeo, yMat);
scene.add(yAxis);
// z-axis
var zGeo = new THREE.Geometry();
zGeo.vertices.push(new THREE.Vector3(0, 0, 0));
zGeo.vertices.push(new THREE.Vector3(0, 0, 1));
var zMat = new THREE.LineBasicMaterial({
color: 0x00ccff
});
var zAxis = new THREE.Line(zGeo, zMat);
scene.add(zAxis);
}
</script>
</head>
<body onload="init()">
<canvas id="mainCanvas" width="400px" height="300px" ></canvas>
</body>
</html>
