multiple stl view

```
Hello, I would like to load multiple stl files on a scene.
I also wants to set the color of each models.

I saw this issue : https://code.google.com/p/jsc3d/issues/detail?id=36
But I didn't found a working example.

Here is my code (it loads only one model) :

JSC3D Demo

var canvas = document.getElementById('cv');
var viewer = new JSC3D.Viewer(canvas);

var components = ['stl/dragon.stl', 'stl/cow.stl'];
var theScene = new JSC3D.Scene;
var numOfLoaded = 0;

var onModelLoaded = function(scene) {
var meshes = scene.getChildren();
for (var i=0; i<meshes.length; i++) {
theScene.addChild(meshes[i]);
}
if (++numOfLoaded == components.length)
viewer.replaceScene(theScene);
};
for (var i=0; i<components.length; i++) {
var loader = new JSC3D.StlLoader;
loader.onload = onModelLoaded;
loader.loadFromUrl(components[i]);
}

viewer.setParameter('ModelColor', '#FF0000');
viewer.setParameter('BackgroundColor1', '#E5D7BA');
viewer.setParameter('BackgroundColor2', '#383840');
viewer.setParameter('Renderer', 'webgl');
viewer.init();
viewer.update();

Thanks a lot.
```

Original issue reported on code.google.com by `nathap...@gmail.com` on 16 Dec 2013 at 4:39

Start with jsc3d.js and jsc3d.webgl.js, then trace the StlLoader and Scene usage shown in the example. Check how loaded meshes and ModelColor are currently handled, and whether per-model color is supported. Done should be demonstrated by loading both listed STL files in one scene with distinct colors.

Written by the indexing model from the issue text.