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I can not figure out how to render a Three-js scene in a canvas on my index page. I have the basic template for the canvas and the basic template for the three-js scene. So how do I render the scene in my canvas?
index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<!--Jquery links-->
<script src="node_modules/jquery/dist/jquery.min.js" rel="script"></script>
<!-- Bootstrap links -->
<link href="node_modules/bootstrap/dist/css/bootstrap.min.css" rel="stylesheet">
<script src="node_modules/bootstrap/dist/js/bootstrap.min.js" rel="script"></script>
<!--Three-js links-->
<script src="node_modules/three-js/three.js" rel="script"></script>
<!-- Custom css and javascript links -->
<link rel="stylesheet" href="css/styles.css">
<script src="js/canvas.js" rel="script"></script>
<script src="js/artifactScene.js" rel="script"></script>
<title></title>
</head>
<body onload="start()">
<div class="container">
<div id="indexRowOne" class="row">
<!--#region sidebarColumn-->
<div id="sidebarColumn" class="col-md-3 pull-left">
<div class="sidebarContainer">
<button><img src="img/egyptMenuGlyph.png"><h4>Ancient Egypt</h4></button>
<button><img src="img/greeceMenuGlyph.png"><h4>Ancient Greece</h4></button>
<button><img src="img/romeMenuGlyph.png"><h4>Ancient Rome</h4></button>
</div>
</div>
<!--#endregion sidebarColumn-->
<div id="canvasColumn" class="col-md-6">
<div class="canvasContainer">
<canvas id="artifactCanvas">
</canvas>
</div>
</div>
<div id="artifactColumn" class="col-md-3 pull-right">
<div class="artifactFrameDiv" >
<img src="artifacts/egypt/graniteHeadofAmenemnat/headOfAhkhmenet.png" class="artifactImage">
<img src="artifacts/egypt/horus_falcon/horusFalcon.png">
<img src="img/test.png">
<img src="img/test.png">
<img src="img/test.png">
<img src="img/test.png">
<img src="img/test.png">
<img src="img/test.png">
<img src="img/test.png">
<img src="img/test.png">
<img src="img/test.png">
<img src="img/test.png">
<img src="img/test.png">
</div>
</div>
</div>
</div>
</body>
canvas.js
var gl; // A global variable for the WebGL context
function start() {
var canvas = document.getElementById("artifactCanvas");
// Initialize the GL context
gl = initWebGL(canvas);
canvas.width = 673;
canvas.height = 472;
// Only continue if WebGL is available and working
if (!gl) {
return;
}
// Set clear color to black, fully opaque
gl.clearColor(0.0, 0.0, 0.0, 1.0);
// Enable depth testing
gl.enable(gl.DEPTH_TEST);
// Near things obscure far things
gl.depthFunc(gl.LEQUAL);
// Clear the color as well as the depth buffer.
gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
}
function initWebGL(canvas) {
gl = null;
// Try to grab the standard context. If it fails, fallback to experimental.
gl = canvas.getContext("webgl") || canvas.getContext("experimental-webgl");
// If we don't have a GL context, give up now
if (!gl) {
alert("Unable to initialize WebGL. Your browser may not support it.");
}
return gl;
}
artifactScene.js
var scene = new THREE.Scene();
var camera = new THREE.PerspectiveCamera( 75, window.innerWidth/window.innerHeight, 0.1, 1000 );
var renderer = new THREE.WebGLRenderer();
renderer.setSize( window.innerWidth, window.innerHeight );
document.body.appendChild( renderer.domElement );
var geometry = new THREE.BoxGeometry( 1, 1, 1 );
var material = new THREE.MeshBasicMaterial( { color: 0x00ff00 } );
var cube = new THREE.Mesh( geometry, material );
scene.add( cube );
camera.position.z = 5;
var render = function () {
requestAnimationFrame( render );
cube.rotation.x += 0.1;
cube.rotation.y += 0.1;
renderer.render(scene, camera);
};
render();
687
js and HTML Canvas. Three. js is a JavaScript library. It uses WebGL under the hood to render 3D objects into an image, and it displays the final result in a canvas element.
Clearing the canvas can be accomplished by renderer. clear() , assuming your THREE. WebGLRenderer is named renderer . Clearing a subtree of the scene graph can be accomplished by group.
js is a cross-browser JavaScript library and application programming interface (API) used to create and display animated 3D computer graphics in a web browser using WebGL.
A Three. js Mesh is a base class that inherits from Object3d and is used to instantiate polygonal objects by combining a Geometry with a Material. Mesh is also the base class for the more advanced MorphAnimMesh and SkinnedMesh classes.
You can specify an existing canvas via
var renderer = new THREE.WebGLRenderer( { canvas: artifactCanvas } );
Example: http://jsfiddle.net/w3wna04q/1/
151
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