Hi dudes,
How can I set a scene with light everywhere?
I mean, same light, to all objets and faces ?
That's all. Any tip? 
I found this code in some post:
private void setupLighting(Renderer renderer, Node rootNode) {
/** Set up a basic, default light. */
DirectionalLight light = new DirectionalLight();
light.setDiffuse(new ColorRGBA(1.0f, 1.0f, 1.0f, 1.0f));
light.setAmbient(new ColorRGBA(0.5f, 0.5f, 0.5f, 1.0f));
light.setDirection(new Vector3f(1, -1, 0));
light.setEnabled(true);
/** Add a second light for more brightness */
DirectionalLight light2 = new DirectionalLight();
light2.setDiffuse(new ColorRGBA(1.0f, 1.0f, 1.0f, 1.0f));
light2.setAmbient(new ColorRGBA(0.5f, 0.5f, 0.5f, 1.0f));
light2.setDirection(new Vector3f(-1, 1, 0));
light2.setEnabled(true);
/** Attach the light to a lightState and the lightState to rootNode. */
LightState lightState = renderer.createLightState();
lightState.setGlobalAmbient(new ColorRGBA(1f, 1f, 1f, 0f));
lightState.setEnabled(true);
lightState.attach(light);
lightState.attach(light2);
rootNode.setRenderState(lightState);
}
It creates 2 directional lights in opposite directions and could be a solution depending on the case... I don't know of any 'general illumination' solution
Maybe make use of ambient light - theres some useful info in this thread
http://www.jmonkeyengine.com/forum/index.php?topic=11711.0