How do I load collada object to three.js? - three.js

Question

I'm new to three.js and am having trouble loading a collada object to it. I can't get home.dae to render in the browser.
I updated the code under SECOND UPDATE based on the answers.
// INITIAL
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 loader = new THREE.ColladaLoader();
loader.load('home.dae', function(collada){
scene.add(collada);
});
function render() {
renderer.render(scene, camera);
}
render();
// SECOND UPDATE
var scene = new THREE.Scene();
var camera = new THREE.PerspectiveCamera(75, window.innerWidth/window.innerHeight, 0.1, 1000);
camera.position.set(0,1,4);
camera.lookAt(scene.position);
var renderer = new THREE.WebGLRenderer();
renderer.setSize(window.innerWidth, window.innerHeight);
document.body.appendChild(renderer.domElement);
var loader = new THREE.ColladaLoader();
loader.load('home.dae', function(collada){
scene.add(collada.scene);
});
function render() {
requestAnimationFrame(render);
renderer.render(scene, camera);
}
render();

Answer 1

Your render function is called only once. Try with this -
function render() {
requestAnimationFrame(render);
renderer.render(scene, camera);
}
Also check if you file path is valid.

Answer 2

Few things that come to mind:
as #Rasheduzzaman already noted, the render-function is called too early (when you call render(), the scene.add(collada); call can not have happened. Use his Answer instead.
the collada-loader works a bit differently: the documentation isn't clear about this, but the returned object is a collection of all the stuff that could've been in the collada-file, see here for a list: https://github.com/mrdoob/three.js/blob/dev/examples/js/loaders/ColladaLoader.js#L181-L204 (also: use the debugger from the browser-devtools to inspect the data you find there). You will probably want to do scene.add(collada.scene) or similar.
you are not setting a position for the camera, so it is located at (0,0,0), which might not be a great idea, try camera.position.set(0,1,4) or something like that.
you need to know what to expect: what is the size of the model you are loading? Where is it placed? Make sure to point your camera there (could use camera.lookAt(object.position)) and adjust nearPlane and farPlane accordingly.