Body body = jbox2dWorld.createDynamicBody(def);
body.setBullet(fastObject);
Vector2d vel = wo.getVelocity();
body.setLinearVelocity(new Vec2((float) vel.getX(), (float) vel.getY()));
for (ShapeDef sd : wo.getShapeDefs()) {
body.createShape(sd);
}
// TODO Use body.setMassFromShapes() for more realism
wo.setBody(body);
objects.add(wo);
}