ThreeJs usage

Hello guys. I’m trying to use the addon ThreeJs to visualize an .obj file but it’s not working.
I downloaded a .jt model from
http://axelandercip.jimdo.com/enhanced/openess/jt-models/
and then I converted it to .obj file using a JAVA library. The conversion is fine but when I try to visualize it in my app I only get a black screen. Here’s my code:

[code]
@Override
protected void init(VaadinRequest request) {

CssLayout layout = new CssLayout();
layout.setSizeFull();

ThreeJs three = new ThreeJs();
three.setSizeFull();
three.loadObj(“obj”, new ThemeResource(“Radial_Engine.obj”));
three.addObj(“obj”);
three.startAnimation();

layout.addComponent(three);
setContent(layout);

}
[/code]Any suggestions of what might be the problem? Is there any JAVA library to visualize and .obj file?
Thanks in advance,
Matías